diff --git a/bin/local-test-util b/bin/local-test-util
index 9b2cfc91bc..7c35964a85 100755
--- a/bin/local-test-util
+++ b/bin/local-test-util
@@ -121,7 +121,7 @@ async function buildNotifiers (notifier) {
 async function packNotifiers (notifier) {
   const notifiers = notifier
     ? [ notifier ]
-    : [ 'js', 'browser', 'node', 'web-worker', 'plugin-angular', 'plugin-react', 'plugin-vue' ]
+    : [ 'core', 'js', 'browser', 'node', 'web-worker', 'plugin-angular', 'plugin-react', 'plugin-vue' ]
   for (const n of notifiers) {
     let packageLocation = `packages/${n}/`
     if (n === 'plugin-angular') packageLocation += 'dist/'
@@ -138,9 +138,11 @@ async function installNotifiers (notifier) {
     `--no-save`,
   ].concat(notifier
     ? [
+      `../../../../bugsnag-core-${require(`../packages/core/package.json`).version}.tgz`,
       `../../../../bugsnag-${notifier}-${require(`../packages/${notifier}/package.json`).version}.tgz`
     ]
     : [
+      `../../../../bugsnag-core-${require('../packages/core/package.json').version}.tgz`,
       `../../../../bugsnag-browser-${require('../packages/browser/package.json').version}.tgz`,
       `../../../../bugsnag-web-worker-${require('../packages/web-worker/package.json').version}.tgz`,
       `../../../../bugsnag-plugin-react-${require('../packages/plugin-react/package.json').version}.tgz`,
@@ -158,6 +160,7 @@ async function installNgNotifier (notifier, version = '12') {
     `install`,
     `--no-package-lock`,
     `--no-save`,
+    `../../../../../../bugsnag-core-${require('../packages/core/package.json').version}.tgz`,
     `../../../../../../bugsnag-browser-${require('../packages/browser/package.json').version}.tgz`,
     `../../../../../../bugsnag-js-${require('../packages/js/package.json').version}.tgz`,
     `../../../../../../bugsnag-node-${require('../packages/node/package.json').version}.tgz`,
diff --git a/config/electron-jest.config.js b/config/electron-jest.config.js
index 32c67a9cc7..99a4a1cb69 100644
--- a/config/electron-jest.config.js
+++ b/config/electron-jest.config.js
@@ -1,6 +1,7 @@
 module.exports = {
   projects: [
     {
+      resolver: '<rootDir>/jest/node-exports-resolver',
       setupFilesAfterEnv: ['<rootDir>/test/electron/setup.ts'],
       clearMocks: true,
       modulePathIgnorePatterns: ['.verdaccio', 'fixtures', 'examples'],
@@ -9,6 +10,7 @@ module.exports = {
       testMatch: ['**/test/**/*.test-main.ts']
     },
     {
+      resolver: '<rootDir>/jest/node-exports-resolver',
       setupFilesAfterEnv: ['<rootDir>/test/electron/setup.ts'],
       clearMocks: true,
       modulePathIgnorePatterns: ['.verdaccio', 'fixtures', 'examples'],
diff --git a/jest.config.js b/jest.config.js
index 472b782d71..5841dd404f 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,6 +1,7 @@
 const testsForPackage = (packageName) => `<rootDir>/packages/${packageName}/**/*.test.[jt]s?(x)`
 
 const project = (displayName, packageNames, config = {}) => ({
+  resolver: '<rootDir>/jest/node-exports-resolver',
   roots: ['<rootDir>/packages'],
   displayName,
   testMatch: packageNames.map(testsForPackage),
diff --git a/jest/node-exports-resolver.js b/jest/node-exports-resolver.js
new file mode 100644
index 0000000000..e9c57889b4
--- /dev/null
+++ b/jest/node-exports-resolver.js
@@ -0,0 +1,183 @@
+const fs = require('fs')
+const path = require('path')
+const packageUp = require('pkg-up')
+
+const defaultConditions = ['require', 'node', 'default']
+
+function findMainPackageJson (entryPath, packageName) {
+  entryPath = entryPath.replace(/\//g, path.sep)
+
+  let directoryName = path.dirname(entryPath)
+
+  let suspect = packageUp.sync({ cwd: directoryName })
+  if (fs.existsSync(suspect)) {
+    return JSON.parse(fs.readFileSync(suspect).toString())
+  }
+
+  while (directoryName && !directoryName.endsWith(packageName)) {
+    const parentDirectoryName = path.resolve(directoryName, '..')
+
+    if (parentDirectoryName === directoryName) break
+
+    directoryName = parentDirectoryName
+  }
+
+  suspect = path.resolve(directoryName, 'package.json')
+  if (fs.existsSync(suspect)) {
+    return JSON.parse(fs.readFileSync(suspect).toString())
+  }
+
+  return null
+}
+
+function getSelfReferencePath (packageName) {
+  let parentDirectoryName = __dirname
+  let directoryName
+
+  while (directoryName !== parentDirectoryName) {
+    directoryName = parentDirectoryName
+
+    try {
+      const { name } = require(path.resolve(directoryName, 'package.json'))
+
+      if (name === packageName) return directoryName
+    } catch {}
+
+    parentDirectoryName = path.resolve(directoryName, '..')
+  }
+}
+
+function getPackageJson (packageName) {
+  // Require `package.json` from the package, both from exported `exports` field
+  // in ESM packages, or directly from the file itself in CommonJS packages.
+  try {
+    return require(`${packageName}/package.json`)
+  } catch (requireError) {
+    if (requireError.code === 'MODULE_NOT_FOUND') {
+      throw requireError
+    }
+    if (requireError.code !== 'ERR_PACKAGE_PATH_NOT_EXPORTED') {
+      return console.error(
+        `Unexpected error while requiring ${packageName}:`, requireError
+      )
+    }
+  }
+
+  // modules's `package.json` does not provide the "./package.json" path at it's
+  // "exports" field. Get package level export or main field and try to resolve
+  // the package.json from it.
+  try {
+    const requestPath = require.resolve(packageName)
+
+    return requestPath && findMainPackageJson(requestPath, packageName)
+  } catch (resolveError) {
+    if (resolveError.code !== 'ERR_PACKAGE_PATH_NOT_EXPORTED') {
+      console.log(
+        `Unexpected error while performing require.resolve(${packageName}):`
+      )
+
+      return console.error(resolveError)
+    }
+  }
+
+  // modules's `package.json` does not provide a package level export nor main
+  // field. Try to find the package manually from `node_modules` folder.
+  const suspect = path.resolve(__dirname, '..', packageName, 'package.json')
+  if (fs.existsSync(suspect)) {
+    return JSON.parse(fs.readFileSync(suspect).toString())
+  }
+
+  console.warn(
+    'Could not retrieve package.json neither through require (package.json ' +
+    'itself is not within "exports" field), nor through require.resolve ' +
+    '(package.json does not specify "main" field) - falling back to default ' +
+    'resolver logic'
+  )
+}
+
+module.exports = (request, options) => {
+  const { conditions = defaultConditions, defaultResolver } = options
+
+  // NOTE: jest-sequencer is a special prefixed jest request
+  const isNodeModuleRequest =
+  !(
+    request.startsWith('.') ||
+    path.isAbsolute(request) ||
+    request.startsWith('jest-sequencer')
+  )
+
+  if (isNodeModuleRequest) {
+    const pkgPathParts = request.split('/')
+    const { length } = pkgPathParts
+
+    let packageName
+    let submoduleName
+
+    if (!request.startsWith('@')) {
+      packageName = pkgPathParts.shift()
+      submoduleName = length > 1 ? `./${pkgPathParts.join('/')}` : '.'
+    } else if (length >= 2) {
+      packageName = `${pkgPathParts.shift()}/${pkgPathParts.shift()}`
+      submoduleName = length > 2 ? `./${pkgPathParts.join('/')}` : '.'
+    }
+
+    if (packageName && submoduleName !== '.') {
+      const selfReferencePath = getSelfReferencePath(packageName)
+      if (selfReferencePath) packageName = selfReferencePath
+
+      const packageJson = getPackageJson(packageName)
+
+      if (!packageJson) {
+        console.error(`Failed to find package.json for ${packageName}`)
+      }
+
+      const { exports } = packageJson || {}
+      if (exports) {
+        let targetFilePath
+
+        if (typeof exports === 'string') { targetFilePath = exports } else if (Object.keys(exports).every((k) => k.startsWith('.'))) {
+          const [exportKey, exportValue] = Object.entries(exports)
+            .find(([k]) => {
+              if (k === submoduleName) return true
+              if (k.endsWith('*')) return submoduleName.startsWith(k.slice(0, -1))
+
+              return false
+            }) || []
+
+          if (typeof exportValue === 'string') {
+            targetFilePath = exportKey.endsWith('*')
+              ? exportValue.replace(
+                /\*/, submoduleName.slice(exportKey.length - 1)
+              )
+              : exportValue
+          } else if (
+            conditions && exportValue != null && typeof exportValue === 'object'
+          ) {
+            function resolveExport (exportValue, prevKeys) {
+              for (const [key, value] of Object.entries(exportValue)) {
+                // Duplicated nested conditions are undefined behaviour (and
+                // probably a format error or spec loop-hole), abort and
+                // delegate to Jest default resolver
+                if (prevKeys.includes(key)) return
+
+                if (!conditions.includes(key)) continue
+
+                if (typeof value === 'string') return value
+
+                return resolveExport(value, prevKeys.concat(key))
+              }
+            }
+
+            targetFilePath = resolveExport(exportValue, [])
+          }
+        }
+
+        if (targetFilePath) {
+          request = targetFilePath.replace('./', `${packageName}/`)
+        }
+      }
+    }
+  }
+
+  return defaultResolver(request, options)
+}
diff --git a/package-lock.json b/package-lock.json
index e1a5594b16..0950e718e9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -34,7 +34,6 @@
         "@rollup/plugin-replace": "^6.0.1",
         "@rollup/plugin-typescript": "^12.1.0",
         "@types/jest": "^26.0.14",
-        "@types/node": "^18",
         "@typescript-eslint/eslint-plugin": "^8.22.0",
         "@typescript-eslint/parser": "^8.22.0",
         "aws-sdk": "^2.1303.0",
@@ -54,6 +53,7 @@
         "lerna": "^8.1.8",
         "metro-react-native-babel-preset": "^0.58.0",
         "ncp": "^2.0.0",
+        "pkg-up": "3.1.0",
         "playwright": "^1.10.0",
         "ps-list": "^7.2.0",
         "rimraf": "^3.0.0",
@@ -38484,6 +38484,85 @@
         "node": ">=8"
       }
     },
+    "node_modules/pkg-up": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/pkg-up/-/pkg-up-3.1.0.tgz",
+      "integrity": "sha512-nDywThFk1i4BQK4twPQ6TA4RT8bDY96yeuCVBWL3ePARCiEKDRSrNGbFIgUJpLp+XeIR65v8ra7WuJOFUBtkMA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "find-up": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/pkg-up/node_modules/find-up": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+      "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "locate-path": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/pkg-up/node_modules/locate-path": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+      "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "p-locate": "^3.0.0",
+        "path-exists": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/pkg-up/node_modules/p-limit": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+      "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "p-try": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/pkg-up/node_modules/p-locate": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+      "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "p-limit": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/pkg-up/node_modules/p-try": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
+      "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/pkginfo": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/pkginfo/-/pkginfo-0.4.1.tgz",
@@ -45602,6 +45681,49 @@
         "error-stack-parser": "^2.0.3",
         "iserror": "^0.0.2",
         "stack-generator": "^2.0.3"
+      },
+      "devDependencies": {
+        "@rollup/plugin-babel": "^6.0.4",
+        "@rollup/plugin-commonjs": "^28.0.2",
+        "@rollup/plugin-node-resolve": "^16.0.0",
+        "@rollup/plugin-replace": "^6.0.2",
+        "@types/jest": "^26",
+        "rollup": "^4.24.0"
+      }
+    },
+    "packages/core/node_modules/@rollup/plugin-node-resolve": {
+      "version": "16.0.0",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-node-resolve/-/plugin-node-resolve-16.0.0.tgz",
+      "integrity": "sha512-0FPvAeVUT/zdWoO0jnb/V5BlBsUSNfkIOtFHzMO4H9MOklrmQFY6FduVHKucNb/aTFxvnGhj4MNj/T1oNdDfNg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@rollup/pluginutils": "^5.0.1",
+        "@types/resolve": "1.20.2",
+        "deepmerge": "^4.2.2",
+        "is-module": "^1.0.0",
+        "resolve": "^1.22.1"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "peerDependencies": {
+        "rollup": "^2.78.0||^3.0.0||^4.0.0"
+      },
+      "peerDependenciesMeta": {
+        "rollup": {
+          "optional": true
+        }
+      }
+    },
+    "packages/core/node_modules/deepmerge": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/deepmerge/-/deepmerge-4.3.1.tgz",
+      "integrity": "sha512-3sUqbMEc77XqpdNO7FRyRog+eW3ph+GYCbj+rK+uYyRMuwsVy0rMiVtPn+QJlKFvWP/1PYpapqYn0Me2knFn+A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
       }
     },
     "packages/delivery-electron": {
@@ -54828,9 +54950,36 @@
       "requires": {
         "@bugsnag/cuid": "^3.0.0",
         "@bugsnag/safe-json-stringify": "^6.0.0",
+        "@rollup/plugin-babel": "^6.0.4",
+        "@rollup/plugin-commonjs": "^28.0.2",
+        "@rollup/plugin-node-resolve": "^16.0.0",
+        "@rollup/plugin-replace": "^6.0.2",
+        "@types/jest": "^26",
         "error-stack-parser": "^2.0.3",
         "iserror": "^0.0.2",
+        "rollup": "^4.24.0",
         "stack-generator": "^2.0.3"
+      },
+      "dependencies": {
+        "@rollup/plugin-node-resolve": {
+          "version": "16.0.0",
+          "resolved": "https://registry.npmjs.org/@rollup/plugin-node-resolve/-/plugin-node-resolve-16.0.0.tgz",
+          "integrity": "sha512-0FPvAeVUT/zdWoO0jnb/V5BlBsUSNfkIOtFHzMO4H9MOklrmQFY6FduVHKucNb/aTFxvnGhj4MNj/T1oNdDfNg==",
+          "dev": true,
+          "requires": {
+            "@rollup/pluginutils": "^5.0.1",
+            "@types/resolve": "1.20.2",
+            "deepmerge": "^4.2.2",
+            "is-module": "^1.0.0",
+            "resolve": "^1.22.1"
+          }
+        },
+        "deepmerge": {
+          "version": "4.3.1",
+          "resolved": "https://registry.npmjs.org/deepmerge/-/deepmerge-4.3.1.tgz",
+          "integrity": "sha512-3sUqbMEc77XqpdNO7FRyRog+eW3ph+GYCbj+rK+uYyRMuwsVy0rMiVtPn+QJlKFvWP/1PYpapqYn0Me2knFn+A==",
+          "dev": true
+        }
       }
     },
     "@bugsnag/cuid": {
@@ -61096,7 +61245,7 @@
       "dev": true,
       "requires": {
         "@jest/types": "^26.6.2",
-        "@types/node": "*",
+        "@types/node": "^18",
         "chalk": "^4.0.0",
         "jest-message-util": "^26.6.2",
         "jest-util": "^26.6.2",
@@ -61111,7 +61260,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -61292,7 +61441,7 @@
         "@jest/test-result": "^26.6.2",
         "@jest/transform": "^26.6.2",
         "@jest/types": "^26.6.2",
-        "@types/node": "*",
+        "@types/node": "^18",
         "ansi-escapes": "^4.2.1",
         "chalk": "^4.0.0",
         "exit": "^0.1.2",
@@ -61336,7 +61485,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -61464,7 +61613,7 @@
           "requires": {
             "@jest/types": "^26.6.2",
             "@types/graceful-fs": "^4.1.2",
-            "@types/node": "*",
+            "@types/node": "^18",
             "anymatch": "^3.0.3",
             "fb-watchman": "^2.0.0",
             "fsevents": "^2.1.2",
@@ -61515,7 +61664,7 @@
             "@jest/environment": "^26.6.2",
             "@jest/test-result": "^26.6.2",
             "@jest/types": "^26.6.2",
-            "@types/node": "*",
+            "@types/node": "^18",
             "chalk": "^4.0.0",
             "emittery": "^0.7.1",
             "exit": "^0.1.2",
@@ -61574,7 +61723,7 @@
           "integrity": "sha512-S5wqyz0DXnNJPd/xfIzZ5Xnp1HrJWBczg8mMfMpN78OJ5eDxXyf+Ygld9wX1DnUWbIbhM1YDY95NjR4CBXkb2g==",
           "dev": true,
           "requires": {
-            "@types/node": "*",
+            "@types/node": "^18",
             "graceful-fs": "^4.2.4"
           }
         },
@@ -61734,7 +61883,7 @@
       "requires": {
         "@jest/fake-timers": "^26.6.2",
         "@jest/types": "^26.6.2",
-        "@types/node": "*",
+        "@types/node": "^18",
         "jest-mock": "^26.6.2"
       },
       "dependencies": {
@@ -61746,7 +61895,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -61859,7 +62008,7 @@
             "@jest/schemas": "^29.6.3",
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -62067,7 +62216,7 @@
           "requires": {
             "@jest/types": "^29.6.3",
             "@types/graceful-fs": "^4.1.3",
-            "@types/node": "*",
+            "@types/node": "^18",
             "anymatch": "^3.0.3",
             "fb-watchman": "^2.0.0",
             "fsevents": "^2.3.2",
@@ -62159,7 +62308,7 @@
           "peer": true,
           "requires": {
             "@jest/types": "^29.6.3",
-            "@types/node": "*",
+            "@types/node": "^18",
             "chalk": "^4.0.0",
             "ci-info": "^3.2.0",
             "graceful-fs": "^4.2.9",
@@ -62174,7 +62323,7 @@
           "optional": true,
           "peer": true,
           "requires": {
-            "@types/node": "*",
+            "@types/node": "^18",
             "jest-util": "^29.7.0",
             "merge-stream": "^2.0.0",
             "supports-color": "^8.0.0"
@@ -62328,7 +62477,7 @@
       "requires": {
         "@jest/types": "^26.6.2",
         "@sinonjs/fake-timers": "^6.0.1",
-        "@types/node": "*",
+        "@types/node": "^18",
         "jest-message-util": "^26.6.2",
         "jest-mock": "^26.6.2",
         "jest-util": "^26.6.2"
@@ -62342,7 +62491,7 @@
           "requires": {
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             "chalk": "^4.0.0"
           }
@@ -78046,7 +78195,7 @@
         "@jest/environment": "^26.6.2",
         "@jest/fake-timers": "^26.6.2",
         "@jest/types": "^26.6.2",
-        "@types/node": "*",
+        "@types/node": "^18",
         "jest-mock": "^26.6.2",
         "jest-util": "^26.6.2"
       },
@@ -78059,7 +78208,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -78288,7 +78437,7 @@
         "@jest/source-map": "^26.6.2",
         "@jest/test-result": "^26.6.2",
         "@jest/types": "^26.6.2",
-        "@types/node": "*",
+        "@types/node": "^18",
         "chalk": "^4.0.0",
         "co": "^4.6.0",
         "expect": "^26.6.2",
@@ -78322,7 +78471,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -78441,7 +78590,7 @@
           "requires": {
             "@jest/types": "^26.6.2",
             "@types/graceful-fs": "^4.1.2",
-            "@types/node": "*",
+            "@types/node": "^18",
             "anymatch": "^3.0.3",
             "fb-watchman": "^2.0.0",
             "fsevents": "^2.1.2",
@@ -78513,7 +78662,7 @@
           "integrity": "sha512-S5wqyz0DXnNJPd/xfIzZ5Xnp1HrJWBczg8mMfMpN78OJ5eDxXyf+Ygld9wX1DnUWbIbhM1YDY95NjR4CBXkb2g==",
           "dev": true,
           "requires": {
-            "@types/node": "*",
+            "@types/node": "^18",
             "graceful-fs": "^4.2.4"
           }
         },
@@ -78703,7 +78852,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -78861,7 +79010,7 @@
       "dev": true,
       "requires": {
         "@jest/types": "^26.6.2",
-        "@types/node": "*"
+        "@types/node": "^18"
       },
       "dependencies": {
         "@jest/types": {
@@ -78872,7 +79021,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -78974,7 +79123,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -79156,7 +79305,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -80622,7 +80771,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -80720,7 +80869,7 @@
           "requires": {
             "@jest/types": "^26.6.2",
             "@types/graceful-fs": "^4.1.2",
-            "@types/node": "*",
+            "@types/node": "^18",
             "anymatch": "^3.0.3",
             "fb-watchman": "^2.0.0",
             "fsevents": "^2.1.2",
@@ -80757,7 +80906,7 @@
           "integrity": "sha512-S5wqyz0DXnNJPd/xfIzZ5Xnp1HrJWBczg8mMfMpN78OJ5eDxXyf+Ygld9wX1DnUWbIbhM1YDY95NjR4CBXkb2g==",
           "dev": true,
           "requires": {
-            "@types/node": "*",
+            "@types/node": "^18",
             "graceful-fs": "^4.2.4"
           }
         },
@@ -80837,7 +80986,7 @@
       "dev": true,
       "requires": {
         "@jest/types": "^26.6.2",
-        "@types/node": "*",
+        "@types/node": "^18",
         "chalk": "^4.0.0",
         "graceful-fs": "^4.2.4",
         "is-ci": "^2.0.0",
@@ -80852,7 +81001,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -80982,7 +81131,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -81079,7 +81228,7 @@
       "requires": {
         "@jest/test-result": "^26.6.2",
         "@jest/types": "^26.6.2",
-        "@types/node": "*",
+        "@types/node": "^18",
         "ansi-escapes": "^4.2.1",
         "chalk": "^4.0.0",
         "jest-util": "^26.6.2",
@@ -81094,7 +81243,7 @@
           "requires": {
             "@types/istanbul-lib-coverage": "^2.0.0",
             "@types/istanbul-reports": "^3.0.0",
-            "@types/node": "*",
+            "@types/node": "^18",
             "@types/yargs": "17.0.10",
             "chalk": "^4.0.0"
           }
@@ -81165,7 +81314,7 @@
       "integrity": "sha512-KWYVV1c4i+jbMpaBC+U++4Va0cp8OisU185o73T1vo99hqi7w8tSJfUXYswwqqrjzwxa6KpRK54WhPvwf5w6PQ==",
       "dev": true,
       "requires": {
-        "@types/node": "*",
+        "@types/node": "^18",
         "merge-stream": "^2.0.0",
         "supports-color": "^7.0.0"
       },
@@ -86886,6 +87035,60 @@
         }
       }
     },
+    "pkg-up": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/pkg-up/-/pkg-up-3.1.0.tgz",
+      "integrity": "sha512-nDywThFk1i4BQK4twPQ6TA4RT8bDY96yeuCVBWL3ePARCiEKDRSrNGbFIgUJpLp+XeIR65v8ra7WuJOFUBtkMA==",
+      "dev": true,
+      "requires": {
+        "find-up": "^3.0.0"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "2.3.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+          "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+          "dev": true,
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "p-try": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
+          "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
+          "dev": true
+        }
+      }
+    },
     "pkginfo": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/pkginfo/-/pkginfo-0.4.1.tgz",
@@ -87355,7 +87558,7 @@
         "@protobufjs/pool": "^1.1.0",
         "@protobufjs/utf8": "^1.1.0",
         "@types/long": "^4.0.1",
-        "@types/node": ">=13.7.0",
+        "@types/node": "^18",
         "long": "^4.0.0"
       }
     },
@@ -90046,7 +90249,7 @@
           "integrity": "sha512-7vuh85V5cdDofPyxn58nrPjBktZo0u9x1g8WtjQol+jZDaE+fhN+cIvTj11GndBnMnyfrUOG1sZQxCdjKh+DKg==",
           "dev": true,
           "requires": {
-            "@types/node": "*",
+            "@types/node": "^18",
             "merge-stream": "^2.0.0",
             "supports-color": "^8.0.0"
           }
diff --git a/package.json b/package.json
index cd077016fb..7efde422a7 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,6 @@
     "@rollup/plugin-replace": "^6.0.1",
     "@rollup/plugin-typescript": "^12.1.0",
     "@types/jest": "^26.0.14",
-    "@types/node": "^18",
     "@typescript-eslint/eslint-plugin": "^8.22.0",
     "@typescript-eslint/parser": "^8.22.0",
     "aws-sdk": "^2.1303.0",
@@ -46,6 +45,7 @@
     "lerna": "^8.1.8",
     "metro-react-native-babel-preset": "^0.58.0",
     "ncp": "^2.0.0",
+    "pkg-up": "3.1.0",
     "playwright": "^1.10.0",
     "ps-list": "^7.2.0",
     "rimraf": "^3.0.0",
@@ -86,6 +86,7 @@
     "@types/express-serve-static-core": "4.17.28",
     "@types/prettier": "2.6.0",
     "@types/yargs": "17.0.10",
+    "@types/node": "^18",
     "node-fetch": "^2.6.7",
     "hermes-engine": "^0.10.0",
     "json-schema": "^0.4.0",
diff --git a/packages/browser/src/bugsnag.ts b/packages/browser/src/bugsnag.ts
index 9af8b76146..36bf6e6c05 100644
--- a/packages/browser/src/bugsnag.ts
+++ b/packages/browser/src/bugsnag.ts
@@ -1,5 +1,5 @@
 import ClientWithInternals from '@bugsnag/core/client'
-import type { BugsnagStatic, Config } from '@bugsnag/core'
+import type { BugsnagStatic, Config, Client } from '@bugsnag/core'
 
 import map from '@bugsnag/core/lib/es-utils/map'
 import keys from '@bugsnag/core/lib/es-utils/keys'
@@ -45,8 +45,8 @@ export interface BrowserConfig extends Config {
 }
 
 export interface BrowserBugsnagStatic extends BugsnagStatic {
-  start(apiKeyOrOpts: string | BrowserConfig): ClientWithInternals
-  createClient(apiKeyOrOpts: string | BrowserConfig): ClientWithInternals
+  start(apiKeyOrOpts: string | BrowserConfig): Client
+  createClient(apiKeyOrOpts: string | BrowserConfig): Client
 }
 
 declare global {
@@ -57,7 +57,7 @@ declare global {
 
 type BrowserClient = Partial<ClientWithInternals> & {
   _client: ClientWithInternals | null
-  createClient: (opts?: Config) => ClientWithInternals
+  createClient: (opts?: Config) => Client
   start: (opts?: Config) => ClientWithInternals
   isStarted: () => boolean
 }
@@ -108,7 +108,7 @@ const notifier: BrowserClient = {
       notifier._client._logger.warn('Bugsnag.start() was called more than once. Ignoring.')
       return notifier._client
     }
-    notifier._client = notifier.createClient(opts)
+    notifier._client = notifier.createClient(opts) as ClientWithInternals
     return notifier._client
   },
   isStarted: () => {
diff --git a/packages/core/lib/test/clone-client.test.ts b/packages/core/lib/test/clone-client.test.ts
deleted file mode 100644
index cd0e4e2210..0000000000
--- a/packages/core/lib/test/clone-client.test.ts
+++ /dev/null
@@ -1,220 +0,0 @@
-import Client from '../../client'
-import cloneClient from '../clone-client'
-
-describe('clone-client', () => {
-  it('should not copy the configuration', () => {
-    const apiKey = '123456abcdef123456abcdef123456ab'
-
-    const original = new Client({ apiKey })
-    const clone = cloneClient(original)
-
-    expect(clone._config).toBe(original._config)
-    expect(clone._config.apiKey).toBe(original._config.apiKey)
-  })
-
-  it('should not copy the logger', () => {
-    const logger = {
-      debug: () => {},
-      info: () => {},
-      warn: () => {},
-      error: () => {}
-    }
-
-    const original = new Client({ apiKey: '123456abcdef123456abcdef123456ab', logger })
-    const clone = cloneClient(original)
-
-    expect(clone._logger).toBe(logger)
-    expect(clone._logger).toBe(original._logger)
-  })
-
-  it('should not copy the delivery implementation', () => {
-    const delivery = {
-      sendEvent: () => {},
-      sendSession: () => {}
-    }
-
-    const original = new Client({ apiKey: '123456abcdef123456abcdef123456ab' })
-    original._setDelivery(() => delivery)
-
-    const clone = cloneClient(original)
-
-    expect(clone._delivery).toBe(delivery)
-    expect(clone._delivery).toBe(original._delivery)
-  })
-
-  it('should not copy the session delegate', () => {
-    const sessionDelegate = {
-      startSession: (client: Client) => client,
-      resumeSession: (client: Client) => client,
-      pauseSession: () => {}
-    }
-
-    const original = new Client({ apiKey: '123456abcdef123456abcdef123456ab' })
-    original._sessionDelegate = sessionDelegate
-
-    const clone = cloneClient(original)
-
-    expect(clone._sessionDelegate).toBe(sessionDelegate)
-    expect(clone._sessionDelegate).toBe(original._sessionDelegate)
-  })
-
-  it('should not copy the context', () => {
-    const original = new Client({ apiKey: '123456abcdef123456abcdef123456ab' })
-    original.setContext('abc')
-
-    const clone = cloneClient(original)
-
-    expect(clone.getContext()).toBe('abc')
-    expect(clone.getContext()).toBe(original.getContext())
-
-    // changing the clone's context shouldn't affect the original's context
-    clone.setContext('xyz')
-
-    expect(clone.getContext()).toBe('xyz')
-    expect(original.getContext()).toBe('abc')
-  })
-
-  it('should clone breadcrumbs', () => {
-    const original = new Client({ apiKey: '123456abcdef123456abcdef123456ab' })
-    original.leaveBreadcrumb('breadcrumb 1')
-
-    expect(original._breadcrumbs).toHaveLength(1)
-    const breadcrumb = original._breadcrumbs[0]
-
-    const clone = cloneClient(original)
-
-    expect(clone._breadcrumbs).toHaveLength(1)
-    expect(clone._breadcrumbs[0]).toBe(breadcrumb)
-    expect(clone._breadcrumbs).not.toBe(original._breadcrumbs)
-
-    // leaving a new breadcrumb on the clone shouldn't affect the original
-    clone.leaveBreadcrumb('breadcrumb 2')
-
-    expect(clone._breadcrumbs).toHaveLength(2)
-    expect(original._breadcrumbs).toHaveLength(1)
-  })
-
-  it('should clone metadata', () => {
-    const original = new Client({ apiKey: '123456abcdef123456abcdef123456ab' })
-    original.addMetadata('abc', 'xyz', 123)
-
-    const clone = cloneClient(original)
-
-    expect(clone._metadata).toStrictEqual({ abc: { xyz: 123 } })
-    expect(clone._metadata).not.toBe(original._metadata)
-
-    // changing the clone's metadata shouldn't affect the original
-    clone.addMetadata('abc', 'xyz', 999)
-
-    expect(clone._metadata).toStrictEqual({ abc: { xyz: 999 } })
-    expect(original._metadata).toStrictEqual({ abc: { xyz: 123 } })
-  })
-
-  it('should clone feature flags', () => {
-    const original = new Client({ apiKey: '123456abcdef123456abcdef123456ab' })
-    original.addFeatureFlag('abc', '123')
-
-    const clone = cloneClient(original)
-
-    expect(clone._features).toStrictEqual([{ name: 'abc', variant: '123' }])
-    expect(clone._features).not.toBe(original._features)
-
-    // changing the clone's feature flags shouldn't affect the original
-    clone.addFeatureFlag('xyz', '999')
-
-    expect(clone._features).toStrictEqual([{ name: 'abc', variant: '123' }, { name: 'xyz', variant: '999' }])
-    expect(original._features).toStrictEqual([{ name: 'abc', variant: '123' }])
-  })
-
-  it('should clone user information', () => {
-    const original = new Client({ apiKey: '123456abcdef123456abcdef123456ab' })
-    original.setUser('123', 'abc@example.com', 'abc')
-
-    const clone = cloneClient(original)
-
-    expect(clone.getUser()).toStrictEqual({ id: '123', email: 'abc@example.com', name: 'abc' })
-    expect(clone.getUser()).not.toBe(original.getUser())
-
-    // changing the clone's user shouldn't affect the original
-    clone.setUser('999', 'xyz@example.com', 'xyz')
-
-    expect(clone.getUser()).toStrictEqual({ id: '999', email: 'xyz@example.com', name: 'xyz' })
-    expect(original.getUser()).toStrictEqual({ id: '123', email: 'abc@example.com', name: 'abc' })
-  })
-
-  it('should clone the on error callback array', () => {
-    const onError = () => {}
-
-    const original = new Client({ apiKey: '123456abcdef123456abcdef123456ab' })
-    original.addOnError(onError)
-
-    const clone = cloneClient(original)
-
-    expect(clone._cbs.e).toHaveLength(1)
-    expect(clone._cbs.e[0]).toBe(onError)
-    expect(clone._cbs.e).not.toBe(original._cbs.e)
-
-    // changing the clone's callbacks shouldn't affect the original
-    clone.addOnError(onError)
-
-    expect(clone._cbs.e).toHaveLength(2)
-    expect(original._cbs.e).toHaveLength(1)
-  })
-
-  it('should clone the on session callback array', () => {
-    const onSession = () => {}
-
-    const original = new Client({ apiKey: '123456abcdef123456abcdef123456ab' })
-    original.addOnSession(onSession)
-
-    const clone = cloneClient(original)
-
-    expect(clone._cbs.s).toHaveLength(1)
-    expect(clone._cbs.s[0]).toBe(onSession)
-    expect(clone._cbs.s).not.toBe(original._cbs.s)
-
-    // changing the clone's callbacks shouldn't affect the original
-    clone.addOnSession(onSession)
-
-    expect(clone._cbs.s).toHaveLength(2)
-    expect(original._cbs.s).toHaveLength(1)
-  })
-
-  it('should clone the on session payload callback array', () => {
-    const onSessionPayload = () => {}
-
-    const original = new Client({ apiKey: '123456abcdef123456abcdef123456ab' })
-    original._addOnSessionPayload(onSessionPayload)
-
-    const clone = cloneClient(original)
-
-    expect(clone._cbs.sp).toHaveLength(1)
-    expect(clone._cbs.sp[0]).toBe(onSessionPayload)
-    expect(clone._cbs.sp).not.toBe(original._cbs.sp)
-
-    // changing the clone's callbacks shouldn't affect the original
-    clone._addOnSessionPayload(onSessionPayload)
-
-    expect(clone._cbs.sp).toHaveLength(2)
-    expect(original._cbs.sp).toHaveLength(1)
-  })
-
-  it('should clone the on breadcrumb callback array', () => {
-    const onBreadcrumb = () => {}
-
-    const original = new Client({ apiKey: '123456abcdef123456abcdef123456ab' })
-    original.addOnBreadcrumb(onBreadcrumb)
-
-    const clone = cloneClient(original)
-
-    expect(clone._cbs.b).toHaveLength(1)
-    expect(clone._cbs.b[0]).toBe(onBreadcrumb)
-    expect(clone._cbs.b).not.toBe(original._cbs.b)
-
-    // changing the clone's callbacks shouldn't affect the original
-    clone.addOnBreadcrumb(onBreadcrumb)
-
-    expect(clone._cbs.b).toHaveLength(2)
-    expect(original._cbs.b).toHaveLength(1)
-  })
-})
diff --git a/packages/core/package.json b/packages/core/package.json
index e179bea905..78709ffedf 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -1,8 +1,40 @@
 {
   "name": "@bugsnag/core",
-  "main": "index.js",
+  "main": "src/index.js",
   "version": "8.2.0",
   "types": "types/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./types/index.d.ts",
+      "import": "./src/index.js",
+      "default": "./src/index.js"
+    },
+    "./lib/clone-client": "./src/lib/clone-client.js",
+    "./lib/json-payload": "./src/lib/json-payload.js",
+    "./lib/es-utils/assign":"./src/lib/es-utils/assign.js",
+    "./lib/validators/int-range": "./src/lib/validators/int-range.js",
+    "./lib/es-utils/map": "./src/lib/es-utils/map.js",
+    "./lib/es-utils/includes": "./src/lib/es-utils/includes.js",
+    "./lib/es-utils/filter": "./src/lib/es-utils/filter.js",
+    "./lib/iserror": "./src/lib/iserror.js",
+    "./lib/es-utils/reduce": "./src/lib/es-utils/reduce.js",
+    "./lib/es-utils/keys": "./src/lib/es-utils/keys.js",
+    "./lib/derecursify": "./src/lib/derecursify.js",
+    "./lib/metadata-delegate": "./src/lib/metadata-delegate.js",
+    "./lib/callback-runner": "./src/lib/callback-runner.js",
+    "./lib/node-fallback-stack": "./src/lib/node-fallback-stack.js",
+    "./lib/sync-callback-runner": "./src/lib/sync-callback-runner.js",
+    "./lib/path-normalizer": "./src/lib/path-normalizer.js",
+    "./lib/validators/string-with-length": "./src/lib/validators/string-with-length.js",
+    "./lib/validators/list-of-functions": "./src/lib/validators/list-of-functions.js",
+    "./lib/extract-object": "./src/lib/extract-object.js",
+    "./lib/feature-flag-delegate": "./src/lib/feature-flag-delegate.js",
+    "./client": { "import": "./src/client.js", "default": "./src/client.js", "types": "./src/client.d.ts" },
+    "./config": "./src/config.js",
+    "./event": { "import": "./src/event.js", "default": "./src/event.js", "types": "./src/event.d.ts" },
+    "./session": "./src/session.js",
+    "./breadcrumb": "./src/breadcrumb.js"
+  },
   "description": "Core classes and utilities for Bugsnag notifiers",
   "homepage": "https://www.bugsnag.com/",
   "repository": {
@@ -13,10 +45,17 @@
     "access": "public"
   },
   "files": [
-    "lib",
+    "src",
     "types",
-    "*.js"
+    "*.js",
+    "dist"
   ],
+  "scripts": {
+    "size": "../../bin/size dist/bugsnag.min.js",
+    "clean": "rm -fr dist && mkdir dist",
+    "build": "npm run clean && npm run build:npm",
+    "build:npm": "rollup --config rollup.config.npm.mjs"
+  },
   "author": "Bugsnag",
   "license": "MIT",
   "dependencies": {
@@ -25,5 +64,13 @@
     "error-stack-parser": "^2.0.3",
     "iserror": "^0.0.2",
     "stack-generator": "^2.0.3"
+  },
+  "devDependencies": {
+    "@types/jest": "^26",
+    "@rollup/plugin-babel": "^6.0.4",
+    "@rollup/plugin-commonjs": "^28.0.2",
+    "@rollup/plugin-node-resolve": "^16.0.0",
+    "@rollup/plugin-replace": "^6.0.2",
+    "rollup": "^4.24.0"
   }
 }
diff --git a/packages/core/rollup.config.npm.mjs b/packages/core/rollup.config.npm.mjs
new file mode 100644
index 0000000000..d85ebe9520
--- /dev/null
+++ b/packages/core/rollup.config.npm.mjs
@@ -0,0 +1,47 @@
+import babel from '@rollup/plugin-babel';
+import commonjs from '@rollup/plugin-commonjs'
+import nodeResolve from '@rollup/plugin-node-resolve'
+import typescript from '@rollup/plugin-typescript'
+
+import createRollupConfig, { sharedOutput } from "../../.rollup/index.mjs"
+
+const plugins = [
+  nodeResolve({
+    browser: true
+  }),
+  commonjs(),
+  typescript(),
+  babel({ babelHelpers: 'bundled' }),
+]
+
+const external = [
+  // '@bugsnag/cuid',
+]
+
+export default [
+  createRollupConfig({
+    input: "src/index.ts",
+    external,
+    output: [
+      {
+        ...sharedOutput,
+        preserveModules: false,
+        entryFileNames: '[name].mjs',
+        format: 'esm'
+      }
+    ],
+    plugins
+  }),
+  createRollupConfig({
+    input: "src/index.ts",
+    external,
+    output: [
+      {
+        ...sharedOutput,
+        entryFileNames: '[name].cjs',
+        format: 'cjs',
+      },
+    ],
+    plugins
+  })
+];
diff --git a/packages/core/breadcrumb.d.ts b/packages/core/src/breadcrumb.d.ts
similarity index 89%
rename from packages/core/breadcrumb.d.ts
rename to packages/core/src/breadcrumb.d.ts
index 793e2a73ec..cdf705ad1e 100644
--- a/packages/core/breadcrumb.d.ts
+++ b/packages/core/src/breadcrumb.d.ts
@@ -1,4 +1,4 @@
-import { Breadcrumb } from './types'
+import { Breadcrumb } from '../types'
 
 export default class BreadcrumbWithInternals extends Breadcrumb {
   constructor (message: string, metadata: Breadcrumb['metadata'], type: Breadcrumb['type'], timestamp?: Date)
diff --git a/packages/core/breadcrumb.js b/packages/core/src/breadcrumb.js
similarity index 100%
rename from packages/core/breadcrumb.js
rename to packages/core/src/breadcrumb.js
diff --git a/packages/core/client.d.ts b/packages/core/src/client.d.ts
similarity index 98%
rename from packages/core/client.d.ts
rename to packages/core/src/client.d.ts
index 46f0818a54..1ef35b4dc8 100644
--- a/packages/core/client.d.ts
+++ b/packages/core/src/client.d.ts
@@ -1,4 +1,4 @@
-import { Client, OnErrorCallback, Config, Breadcrumb, Session, OnSessionCallback, OnBreadcrumbCallback, Plugin, Device, App, User, FeatureFlag } from './types'
+import { Client, OnErrorCallback, Config, Breadcrumb, Session, OnSessionCallback, OnBreadcrumbCallback, Plugin, Device, App, User, FeatureFlag } from '../types'
 import EventWithInternals from './event'
 
 interface LoggerConfig {
diff --git a/packages/core/client.js b/packages/core/src/client.js
similarity index 100%
rename from packages/core/client.js
rename to packages/core/src/client.js
diff --git a/packages/core/config.d.ts b/packages/core/src/config.d.ts
similarity index 100%
rename from packages/core/config.d.ts
rename to packages/core/src/config.d.ts
diff --git a/packages/core/config.js b/packages/core/src/config.js
similarity index 100%
rename from packages/core/config.js
rename to packages/core/src/config.js
diff --git a/packages/core/event.d.ts b/packages/core/src/event.d.ts
similarity index 95%
rename from packages/core/event.d.ts
rename to packages/core/src/event.d.ts
index 85f70cfe99..d5d7852aa9 100644
--- a/packages/core/event.d.ts
+++ b/packages/core/src/event.d.ts
@@ -1,5 +1,5 @@
-import { App, Device, Event, Request, Breadcrumb, User, Session, FeatureFlag } from './types'
-import { Error } from './types/event'
+import { App, Device, Event, Request, Breadcrumb, User, Session, FeatureFlag } from '../types'
+import { Error } from '../types/event'
 
 interface HandledState {
   unhandled: boolean
diff --git a/packages/core/event.js b/packages/core/src/event.js
similarity index 100%
rename from packages/core/event.js
rename to packages/core/src/event.js
diff --git a/packages/core/index.js b/packages/core/src/index.js
similarity index 100%
rename from packages/core/index.js
rename to packages/core/src/index.js
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
new file mode 100644
index 0000000000..21bbf6ec80
--- /dev/null
+++ b/packages/core/src/index.ts
@@ -0,0 +1,4 @@
+export { default as Breadcrumb } from './breadcrumb'
+export { default as Client } from './client'
+export { default as Event } from './event'
+export { default as Session } from './session'
diff --git a/packages/core/lib/async-every.d.ts b/packages/core/src/lib/async-every.d.ts
similarity index 100%
rename from packages/core/lib/async-every.d.ts
rename to packages/core/src/lib/async-every.d.ts
diff --git a/packages/core/lib/async-every.js b/packages/core/src/lib/async-every.js
similarity index 100%
rename from packages/core/lib/async-every.js
rename to packages/core/src/lib/async-every.js
diff --git a/packages/core/lib/breadcrumb-types.js b/packages/core/src/lib/breadcrumb-types.js
similarity index 100%
rename from packages/core/lib/breadcrumb-types.js
rename to packages/core/src/lib/breadcrumb-types.js
diff --git a/packages/core/lib/callback-runner.d.ts b/packages/core/src/lib/callback-runner.d.ts
similarity index 100%
rename from packages/core/lib/callback-runner.d.ts
rename to packages/core/src/lib/callback-runner.d.ts
diff --git a/packages/core/lib/callback-runner.js b/packages/core/src/lib/callback-runner.js
similarity index 100%
rename from packages/core/lib/callback-runner.js
rename to packages/core/src/lib/callback-runner.js
diff --git a/packages/core/lib/clone-client.js b/packages/core/src/lib/clone-client.js
similarity index 100%
rename from packages/core/lib/clone-client.js
rename to packages/core/src/lib/clone-client.js
diff --git a/packages/core/lib/derecursify.js b/packages/core/src/lib/derecursify.js
similarity index 100%
rename from packages/core/lib/derecursify.js
rename to packages/core/src/lib/derecursify.js
diff --git a/packages/core/lib/error-stack-parser.js b/packages/core/src/lib/error-stack-parser.js
similarity index 100%
rename from packages/core/lib/error-stack-parser.js
rename to packages/core/src/lib/error-stack-parser.js
diff --git a/packages/core/lib/es-utils/assign.d.ts b/packages/core/src/lib/es-utils/assign.d.ts
similarity index 100%
rename from packages/core/lib/es-utils/assign.d.ts
rename to packages/core/src/lib/es-utils/assign.d.ts
diff --git a/packages/core/lib/es-utils/assign.js b/packages/core/src/lib/es-utils/assign.js
similarity index 100%
rename from packages/core/lib/es-utils/assign.js
rename to packages/core/src/lib/es-utils/assign.js
diff --git a/packages/core/lib/es-utils/filter.d.ts b/packages/core/src/lib/es-utils/filter.d.ts
similarity index 100%
rename from packages/core/lib/es-utils/filter.d.ts
rename to packages/core/src/lib/es-utils/filter.d.ts
diff --git a/packages/core/lib/es-utils/filter.js b/packages/core/src/lib/es-utils/filter.js
similarity index 100%
rename from packages/core/lib/es-utils/filter.js
rename to packages/core/src/lib/es-utils/filter.js
diff --git a/packages/core/lib/es-utils/includes.d.ts b/packages/core/src/lib/es-utils/includes.d.ts
similarity index 100%
rename from packages/core/lib/es-utils/includes.d.ts
rename to packages/core/src/lib/es-utils/includes.d.ts
diff --git a/packages/core/lib/es-utils/includes.js b/packages/core/src/lib/es-utils/includes.js
similarity index 100%
rename from packages/core/lib/es-utils/includes.js
rename to packages/core/src/lib/es-utils/includes.js
diff --git a/packages/core/lib/es-utils/is-array.d.ts b/packages/core/src/lib/es-utils/is-array.d.ts
similarity index 100%
rename from packages/core/lib/es-utils/is-array.d.ts
rename to packages/core/src/lib/es-utils/is-array.d.ts
diff --git a/packages/core/lib/es-utils/is-array.js b/packages/core/src/lib/es-utils/is-array.js
similarity index 100%
rename from packages/core/lib/es-utils/is-array.js
rename to packages/core/src/lib/es-utils/is-array.js
diff --git a/packages/core/lib/es-utils/keys.d.ts b/packages/core/src/lib/es-utils/keys.d.ts
similarity index 100%
rename from packages/core/lib/es-utils/keys.d.ts
rename to packages/core/src/lib/es-utils/keys.d.ts
diff --git a/packages/core/lib/es-utils/keys.js b/packages/core/src/lib/es-utils/keys.js
similarity index 100%
rename from packages/core/lib/es-utils/keys.js
rename to packages/core/src/lib/es-utils/keys.js
diff --git a/packages/core/lib/es-utils/map.d.ts b/packages/core/src/lib/es-utils/map.d.ts
similarity index 100%
rename from packages/core/lib/es-utils/map.d.ts
rename to packages/core/src/lib/es-utils/map.d.ts
diff --git a/packages/core/lib/es-utils/map.js b/packages/core/src/lib/es-utils/map.js
similarity index 100%
rename from packages/core/lib/es-utils/map.js
rename to packages/core/src/lib/es-utils/map.js
diff --git a/packages/core/lib/es-utils/reduce.d.ts b/packages/core/src/lib/es-utils/reduce.d.ts
similarity index 100%
rename from packages/core/lib/es-utils/reduce.d.ts
rename to packages/core/src/lib/es-utils/reduce.d.ts
diff --git a/packages/core/lib/es-utils/reduce.js b/packages/core/src/lib/es-utils/reduce.js
similarity index 100%
rename from packages/core/lib/es-utils/reduce.js
rename to packages/core/src/lib/es-utils/reduce.js
diff --git a/packages/core/lib/extract-object.js b/packages/core/src/lib/extract-object.js
similarity index 100%
rename from packages/core/lib/extract-object.js
rename to packages/core/src/lib/extract-object.js
diff --git a/packages/core/lib/feature-flag-delegate.js b/packages/core/src/lib/feature-flag-delegate.js
similarity index 100%
rename from packages/core/lib/feature-flag-delegate.js
rename to packages/core/src/lib/feature-flag-delegate.js
diff --git a/packages/core/lib/has-stack.js b/packages/core/src/lib/has-stack.js
similarity index 100%
rename from packages/core/lib/has-stack.js
rename to packages/core/src/lib/has-stack.js
diff --git a/packages/core/lib/iserror.d.ts b/packages/core/src/lib/iserror.d.ts
similarity index 100%
rename from packages/core/lib/iserror.d.ts
rename to packages/core/src/lib/iserror.d.ts
diff --git a/packages/core/lib/iserror.js b/packages/core/src/lib/iserror.js
similarity index 100%
rename from packages/core/lib/iserror.js
rename to packages/core/src/lib/iserror.js
diff --git a/packages/core/lib/json-payload.d.ts b/packages/core/src/lib/json-payload.d.ts
similarity index 100%
rename from packages/core/lib/json-payload.d.ts
rename to packages/core/src/lib/json-payload.d.ts
diff --git a/packages/core/lib/json-payload.js b/packages/core/src/lib/json-payload.js
similarity index 100%
rename from packages/core/lib/json-payload.js
rename to packages/core/src/lib/json-payload.js
diff --git a/packages/core/lib/metadata-delegate.js b/packages/core/src/lib/metadata-delegate.js
similarity index 100%
rename from packages/core/lib/metadata-delegate.js
rename to packages/core/src/lib/metadata-delegate.js
diff --git a/packages/core/lib/node-fallback-stack.js b/packages/core/src/lib/node-fallback-stack.js
similarity index 100%
rename from packages/core/lib/node-fallback-stack.js
rename to packages/core/src/lib/node-fallback-stack.js
diff --git a/packages/core/lib/path-normalizer.js b/packages/core/src/lib/path-normalizer.js
similarity index 100%
rename from packages/core/lib/path-normalizer.js
rename to packages/core/src/lib/path-normalizer.js
diff --git a/packages/core/lib/sync-callback-runner.js b/packages/core/src/lib/sync-callback-runner.js
similarity index 100%
rename from packages/core/lib/sync-callback-runner.js
rename to packages/core/src/lib/sync-callback-runner.js
diff --git a/packages/core/lib/validators/int-range.d.ts b/packages/core/src/lib/validators/int-range.d.ts
similarity index 100%
rename from packages/core/lib/validators/int-range.d.ts
rename to packages/core/src/lib/validators/int-range.d.ts
diff --git a/packages/core/lib/validators/int-range.js b/packages/core/src/lib/validators/int-range.js
similarity index 100%
rename from packages/core/lib/validators/int-range.js
rename to packages/core/src/lib/validators/int-range.js
diff --git a/packages/core/lib/validators/list-of-functions.js b/packages/core/src/lib/validators/list-of-functions.js
similarity index 100%
rename from packages/core/lib/validators/list-of-functions.js
rename to packages/core/src/lib/validators/list-of-functions.js
diff --git a/packages/core/lib/validators/string-with-length.js b/packages/core/src/lib/validators/string-with-length.js
similarity index 100%
rename from packages/core/lib/validators/string-with-length.js
rename to packages/core/src/lib/validators/string-with-length.js
diff --git a/packages/core/session.d.ts b/packages/core/src/session.d.ts
similarity index 90%
rename from packages/core/session.d.ts
rename to packages/core/src/session.d.ts
index c60d922ce3..ba319e74dd 100644
--- a/packages/core/session.d.ts
+++ b/packages/core/src/session.d.ts
@@ -1,4 +1,4 @@
-import Session from './types/session'
+import Session from '../types/session'
 
 interface MinimalEvent {
   _handledState: {
diff --git a/packages/core/session.js b/packages/core/src/session.js
similarity index 100%
rename from packages/core/session.js
rename to packages/core/src/session.js
diff --git a/packages/core/test/breadcrumb.test.ts b/packages/core/test/breadcrumb.test.ts
index 9a8b9ece21..b48e1489e2 100644
--- a/packages/core/test/breadcrumb.test.ts
+++ b/packages/core/test/breadcrumb.test.ts
@@ -1,4 +1,4 @@
-import Breadcrumb from '../breadcrumb'
+import Breadcrumb from '../src/breadcrumb'
 
 describe('@bugsnag/core/breadcrumb', () => {
   describe('toJSON()', () => {
diff --git a/packages/core/test/client.test.ts b/packages/core/test/client.test.ts
index 39441937de..f6c090afda 100644
--- a/packages/core/test/client.test.ts
+++ b/packages/core/test/client.test.ts
@@ -1,7 +1,7 @@
-import Client from '../client'
-import Event from '../event'
-import Session from '../session'
-import breadcrumbTypes from '../lib/breadcrumb-types'
+import Client from '../src/client'
+import Event from '../src/event'
+import Session from '../src/session'
+import breadcrumbTypes from '../src/lib/breadcrumb-types'
 import { BreadcrumbType } from '../types/common'
 
 const noop = () => {}
diff --git a/packages/core/test/config.test.ts b/packages/core/test/config.test.ts
index 26a169043c..829b4cf2be 100644
--- a/packages/core/test/config.test.ts
+++ b/packages/core/test/config.test.ts
@@ -1,4 +1,4 @@
-import config from '../config'
+import config from '../src/config'
 
 describe('@bugsnag/core/config', () => {
   describe('schema', () => {
diff --git a/packages/core/test/event.test.ts b/packages/core/test/event.test.ts
index 17e2268bdf..143c4b151f 100644
--- a/packages/core/test/event.test.ts
+++ b/packages/core/test/event.test.ts
@@ -1,5 +1,5 @@
 import ErrorStackParser from 'error-stack-parser'
-import Event from '../event'
+import Event from '../src/event'
 
 jest.mock('stack-generator', () => ({
   backtrace: () => [{}, {}]
diff --git a/packages/core/lib/test/async-every.test.ts b/packages/core/test/lib/async-every.test.ts
similarity index 96%
rename from packages/core/lib/test/async-every.test.ts
rename to packages/core/test/lib/async-every.test.ts
index 8aff108e4f..1e02ba1e61 100644
--- a/packages/core/lib/test/async-every.test.ts
+++ b/packages/core/test/lib/async-every.test.ts
@@ -1,4 +1,4 @@
-import every from '../async-every'
+import every from '../../src/lib/async-every'
 
 describe('async-every', () => {
   it('handles iterator errors', done => {
diff --git a/packages/core/lib/test/callback-runner.test.ts b/packages/core/test/lib/callback-runner.test.ts
similarity index 95%
rename from packages/core/lib/test/callback-runner.test.ts
rename to packages/core/test/lib/callback-runner.test.ts
index 1d2ccda067..ad5d5e283e 100644
--- a/packages/core/lib/test/callback-runner.test.ts
+++ b/packages/core/test/lib/callback-runner.test.ts
@@ -1,5 +1,5 @@
-import runCallbacks from '../callback-runner'
-import { NodeCallbackType } from '../async-every'
+import runCallbacks from '../../src/lib/callback-runner'
+import { NodeCallbackType } from '../../src/lib/async-every'
 
 interface TestEvent {
   name: string
diff --git a/packages/core/test/lib/clone-client.test.ts b/packages/core/test/lib/clone-client.test.ts
index 13bc6782d8..a5bb728c9c 100644
--- a/packages/core/test/lib/clone-client.test.ts
+++ b/packages/core/test/lib/clone-client.test.ts
@@ -1,5 +1,5 @@
-import Client from '../../client'
-import clone from '../../lib/clone-client'
+import Client from '../../src/client'
+import clone from '../../src/lib/clone-client'
 
 const apiKey = 'abcabcabcabcabcabcabc1234567890f'
 
diff --git a/packages/core/lib/test/derecursify.test.ts b/packages/core/test/lib/derecursify.test.ts
similarity index 98%
rename from packages/core/lib/test/derecursify.test.ts
rename to packages/core/test/lib/derecursify.test.ts
index 5e6cf12ae0..d0db9ef867 100644
--- a/packages/core/lib/test/derecursify.test.ts
+++ b/packages/core/test/lib/derecursify.test.ts
@@ -1,4 +1,4 @@
-import derecursift from '../derecursify'
+import derecursift from '../../src/lib/derecursify'
 
 describe('delivery: react native makeSafe', () => {
   it('leaves simple types intact', () => {
diff --git a/packages/core/lib/test/es-utils.test.ts b/packages/core/test/lib/es-utils.test.ts
similarity index 84%
rename from packages/core/lib/test/es-utils.test.ts
rename to packages/core/test/lib/es-utils.test.ts
index dc4e96c953..c40d19f83b 100644
--- a/packages/core/lib/test/es-utils.test.ts
+++ b/packages/core/test/lib/es-utils.test.ts
@@ -1,9 +1,9 @@
-import map from '../es-utils/map'
-import reduce from '../es-utils/reduce'
-import filter from '../es-utils/filter'
-import keys from '../es-utils/keys'
-import isArray from '../es-utils/is-array'
-import includes from '../es-utils/includes'
+import map from '../../src/lib/es-utils/map'
+import reduce from '../../src/lib/es-utils/reduce'
+import filter from '../../src/lib/es-utils/filter'
+import keys from '../../src/lib/es-utils/keys'
+import isArray from '../../src/lib/es-utils/is-array'
+import includes from '../../src/lib/es-utils/includes'
 
 describe('es-utils', () => {
   describe('reduce(arr, fn, accum)', () => {
diff --git a/packages/core/lib/test/extract-object.test.ts b/packages/core/test/lib/extract-object.test.ts
similarity index 85%
rename from packages/core/lib/test/extract-object.test.ts
rename to packages/core/test/lib/extract-object.test.ts
index fb78f31e51..713c434b75 100644
--- a/packages/core/lib/test/extract-object.test.ts
+++ b/packages/core/test/lib/extract-object.test.ts
@@ -1,4 +1,4 @@
-import extractObject from '../extract-object'
+import extractObject from '../../src/lib/extract-object'
 
 describe('extractObject', () => {
   it('returns undefined if the key is not an object, or the value otherwise', () => {
diff --git a/packages/core/lib/test/feature-flag-delegate.test.ts b/packages/core/test/lib/feature-flag-delegate.test.ts
similarity index 99%
rename from packages/core/lib/test/feature-flag-delegate.test.ts
rename to packages/core/test/lib/feature-flag-delegate.test.ts
index 8d8a2d69f3..7164f82488 100644
--- a/packages/core/lib/test/feature-flag-delegate.test.ts
+++ b/packages/core/test/lib/feature-flag-delegate.test.ts
@@ -1,4 +1,4 @@
-import delegate from '../feature-flag-delegate'
+import delegate from '../../src/lib/feature-flag-delegate'
 
 describe('feature flag delegate', () => {
   describe('#add', () => {
diff --git a/packages/core/lib/test/json-payload.test.ts b/packages/core/test/lib/json-payload.test.ts
similarity index 98%
rename from packages/core/lib/test/json-payload.test.ts
rename to packages/core/test/lib/json-payload.test.ts
index 44cf86c760..e576ae9a58 100644
--- a/packages/core/lib/test/json-payload.test.ts
+++ b/packages/core/test/lib/json-payload.test.ts
@@ -1,4 +1,4 @@
-import jsonPayload from '../json-payload'
+import jsonPayload from '../../src/lib/json-payload'
 
 function makeBigObject () {
   var big: Record<string, string> = {}
diff --git a/packages/core/lib/test/validators.test.ts b/packages/core/test/lib/validators.test.ts
similarity index 88%
rename from packages/core/lib/test/validators.test.ts
rename to packages/core/test/lib/validators.test.ts
index f95b80c531..8fad64f23b 100644
--- a/packages/core/lib/test/validators.test.ts
+++ b/packages/core/test/lib/validators.test.ts
@@ -1,5 +1,5 @@
-import intRange from '../validators/int-range'
-import stringWithLength from '../validators/string-with-length'
+import intRange from '../../src/lib/validators/int-range'
+import stringWithLength from '../../src/lib/validators/string-with-length'
 
 describe('intRange(min, max)(val)', () => {
   it('work with various values', () => {
diff --git a/packages/core/test/metadata-delegate.test.js b/packages/core/test/metadata-delegate.test.js
index 3dded77630..ebcaee2593 100644
--- a/packages/core/test/metadata-delegate.test.js
+++ b/packages/core/test/metadata-delegate.test.js
@@ -1,4 +1,4 @@
-import { add, clear } from '../lib/metadata-delegate'
+import { add, clear } from '../src/lib/metadata-delegate'
 
 // it doesn't seem easy or even impossible to check whether __proto__ keys can be overwritten
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto
diff --git a/packages/core/test/session.test.ts b/packages/core/test/session.test.ts
index 931570e567..098a28e304 100644
--- a/packages/core/test/session.test.ts
+++ b/packages/core/test/session.test.ts
@@ -1,4 +1,4 @@
-import Session from '../session'
+import Session from '../src/session'
 
 describe('@bugsnag/core/session', () => {
   describe('toJSON()', () => {
diff --git a/packages/core/tsconfig.json b/packages/core/tsconfig.json
new file mode 100644
index 0000000000..3f195727e2
--- /dev/null
+++ b/packages/core/tsconfig.json
@@ -0,0 +1,12 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "lib": [ "dom", "es2022" ],
+    "allowJs": true,
+    "outDir": "dist",
+    "removeComments": true,
+    "noEmitOnError": true,
+    "target": "es5",
+  },
+  "include": ["src/**/*.ts", "src/**/*.js"]
+}
diff --git a/packages/delivery-x-domain-request/src/delivery.ts b/packages/delivery-x-domain-request/src/delivery.ts
index ae281840d8..72179c636a 100644
--- a/packages/delivery-x-domain-request/src/delivery.ts
+++ b/packages/delivery-x-domain-request/src/delivery.ts
@@ -5,8 +5,8 @@ import { Client, Config, Event, Session } from '@bugsnag/core'
 import getApiUrl from './get-api-url'
 import matchPageProtocol from './match-page-protocol'
 
-import type ClientWithInternals from 'packages/core/client'
-import type { Delivery } from 'packages/core/client'
+import type ClientWithInternals from '@bugsnag/core/client'
+import type { Delivery } from '@bugsnag/core/client'
 
 const delivery = (client: Client, win = window): Delivery => ({
   sendEvent: (event, cb = () => {}) => {
diff --git a/packages/delivery-xml-http-request/src/delivery.ts b/packages/delivery-xml-http-request/src/delivery.ts
index e357a88022..b7b04e7523 100644
--- a/packages/delivery-xml-http-request/src/delivery.ts
+++ b/packages/delivery-xml-http-request/src/delivery.ts
@@ -1,8 +1,8 @@
 import type { Client, Config } from '@bugsnag/core'
 
 import payload from '@bugsnag/core/lib/json-payload'
-import { Event } from 'packages/core'
-import ClientWithInternals, { Delivery } from 'packages/core/client'
+import { Event } from '@bugsnag/core'
+import ClientWithInternals, { Delivery } from '@bugsnag/core/client'
 
 
 function getIntegrityHeaderValue (windowOrWorkerGlobalScope: Window, requestBody: string) {
diff --git a/packages/node/src/bugsnag.ts b/packages/node/src/bugsnag.ts
index 2752b6fbb5..400b6aca76 100644
--- a/packages/node/src/bugsnag.ts
+++ b/packages/node/src/bugsnag.ts
@@ -6,8 +6,6 @@ import assign from '@bugsnag/core/lib/es-utils/assign'
 import { schema as baseConfig } from '@bugsnag/core/config'
 import browserConfig from './config'
 
-import Event from '@bugsnag/core/event'
-
 import delivery from '@bugsnag/delivery-node'
 
 import pluginApp from '@bugsnag/plugin-app-duration'
@@ -22,8 +20,9 @@ import pluginIntercept from '@bugsnag/plugin-intercept'
 import pluginContextualize from '@bugsnag/plugin-contextualize'
 import pluginStackframePathNormaliser from '@bugsnag/plugin-stackframe-path-normaliser'
 import pluginConsoleBreadcrumbs from '@bugsnag/plugin-console-breadcrumbs'
-import { BugsnagStatic, Config, Logger } from '@bugsnag/core'
+import { BugsnagStatic, Client, Config, Event, Logger } from '@bugsnag/core'
 import ClientWithInternals from '@bugsnag/core/client'
+import EventWithInternals from '@bugsnag/core/event'
 
 type AfterErrorCb = (err: any, event: Event, logger: Logger) => void;
 
@@ -39,8 +38,8 @@ export interface NodeConfig extends Config {
 }
 
 export interface NodeBugsnagStatic extends BugsnagStatic {
-  start(apiKeyOrOpts: string | NodeConfig): ClientWithInternals
-  createClient(apiKeyOrOpts: string | NodeConfig): ClientWithInternals
+  start(apiKeyOrOpts: string | NodeConfig): Client
+  createClient(apiKeyOrOpts: string | NodeConfig): Client
 }
 
 const name = 'Bugsnag Node'
@@ -48,7 +47,7 @@ const version = '__BUGSNAG_NOTIFIER_VERSION__'
 const url = 'https://github.com/bugsnag/bugsnag-js'
 
 // @ts-ignore
-Event.__type = 'nodejs'
+EventWithInternals.__type = 'nodejs'
 
 // extend the base config schema with some node-specific options
 const internalPlugins = [
@@ -68,7 +67,7 @@ const internalPlugins = [
 
 type NodeClient = Partial<ClientWithInternals> & {
   _client: ClientWithInternals | null
-  createClient: (opts?: Config) => ClientWithInternals
+  createClient: (opts?: Config) => Client
   start: (opts?: Config) => ClientWithInternals
   isStarted: () => boolean
 }
@@ -121,7 +120,7 @@ const notifier: NodeClient = {
       notifier._client._logger.warn('Bugsnag.start() was called more than once. Ignoring.')
       return notifier._client
     }
-    notifier._client = notifier.createClient(opts)
+    notifier._client = notifier.createClient(opts) as ClientWithInternals
     return notifier._client
   },
   isStarted: () => {
diff --git a/packages/node/src/config.ts b/packages/node/src/config.ts
index 157ee4c434..adaa286b23 100644
--- a/packages/node/src/config.ts
+++ b/packages/node/src/config.ts
@@ -5,8 +5,8 @@ import { inspect } from 'util'
 
 import assign from '@bugsnag/core/lib/es-utils/assign'
 import getPrefixedConsole from './get-prefixed-console'
-import EventWithInternals from 'packages/core/event'
-import { LoggerConfig } from 'packages/core/client'
+import EventWithInternals from '@bugsnag/core/event'
+import { LoggerConfig } from '@bugsnag/core/client'
 
 const config = {
   appType: {
diff --git a/packages/plugin-app-duration/src/app-duration.ts b/packages/plugin-app-duration/src/app-duration.ts
index 7b96b7c9ba..6eef4ff7b6 100644
--- a/packages/plugin-app-duration/src/app-duration.ts
+++ b/packages/plugin-app-duration/src/app-duration.ts
@@ -1,4 +1,4 @@
-import { Plugin } from 'packages/core/types'
+import { Plugin } from '@bugsnag/core'
 
 let appStart = new Date()
 const reset = () => { appStart = new Date() }
diff --git a/packages/plugin-client-ip/src/client-ip.ts b/packages/plugin-client-ip/src/client-ip.ts
index 4fb6c08885..c81fb03cef 100644
--- a/packages/plugin-client-ip/src/client-ip.ts
+++ b/packages/plugin-client-ip/src/client-ip.ts
@@ -1,4 +1,4 @@
-import { Client, Plugin } from 'packages/core/types'
+import { Client, Plugin } from '@bugsnag/core'
 import assign from '@bugsnag/core/lib/es-utils/assign'
 
 interface InternalClient extends Client {
diff --git a/packages/plugin-interaction-breadcrumbs/src/interaction-breadcrumbs.ts b/packages/plugin-interaction-breadcrumbs/src/interaction-breadcrumbs.ts
index d910565175..33941db5d9 100644
--- a/packages/plugin-interaction-breadcrumbs/src/interaction-breadcrumbs.ts
+++ b/packages/plugin-interaction-breadcrumbs/src/interaction-breadcrumbs.ts
@@ -1,5 +1,5 @@
 import { Plugin } from '@bugsnag/core'
-import type ClientWithInternals from 'packages/core/client'
+import type ClientWithInternals from '@bugsnag/core/client'
 
 /*
  * Leaves breadcrumbs when the user interacts with the DOM
diff --git a/packages/plugin-navigation-breadcrumbs/src/navigation-breadcrumbs.ts b/packages/plugin-navigation-breadcrumbs/src/navigation-breadcrumbs.ts
index 10559b8053..7766fcc2e3 100644
--- a/packages/plugin-navigation-breadcrumbs/src/navigation-breadcrumbs.ts
+++ b/packages/plugin-navigation-breadcrumbs/src/navigation-breadcrumbs.ts
@@ -1,4 +1,4 @@
-import { Client, Plugin } from 'packages/core/types'
+import { Client, Plugin } from '@bugsnag/core'
 
 interface PluginClient extends Client {
   _isBreadcrumbTypeEnabled: (type: string) => boolean
diff --git a/packages/plugin-strip-query-string/test/strip-query-string.test.ts b/packages/plugin-strip-query-string/test/strip-query-string.test.ts
index d1a8568fc1..4eb1f0cd29 100644
--- a/packages/plugin-strip-query-string/test/strip-query-string.test.ts
+++ b/packages/plugin-strip-query-string/test/strip-query-string.test.ts
@@ -1,7 +1,7 @@
 import plugin from '../'
 
 import Client, { EventDeliveryPayload } from '@bugsnag/core/client'
-import { Stackframe } from '@bugsnag/core/types/common'
+import { Stackframe } from '@bugsnag/core'
 
 describe('plugin: strip query string', () => {
   it('should strip querystrings and fragments from urls', () => {
diff --git a/packages/plugin-window-onerror/src/onerror.ts b/packages/plugin-window-onerror/src/onerror.ts
index 3e9f199329..950c2be1f3 100644
--- a/packages/plugin-window-onerror/src/onerror.ts
+++ b/packages/plugin-window-onerror/src/onerror.ts
@@ -2,7 +2,7 @@
  * Automatically notifies Bugsnag when window.onerror is called
  */
 
-import type { Plugin, Stackframe } from 'packages/core/types'
+import type { Plugin, Stackframe } from '@bugsnag/core'
 
 export default (win = window, component = 'window onerror'): Plugin => ({
   load: (client) => {
diff --git a/packages/plugin-window-unhandled-rejection/src/fix-bluebird-stacktrace.ts b/packages/plugin-window-unhandled-rejection/src/fix-bluebird-stacktrace.ts
index 1e4740c82a..8c2d46f051 100644
--- a/packages/plugin-window-unhandled-rejection/src/fix-bluebird-stacktrace.ts
+++ b/packages/plugin-window-unhandled-rejection/src/fix-bluebird-stacktrace.ts
@@ -1,4 +1,4 @@
-import { Stackframe } from 'packages/core/types'
+import { Stackframe } from '@bugsnag/core'
 
 // The stack parser on bluebird stacks in FF get a suprious first frame:
 //
diff --git a/tsconfig.json b/tsconfig.json
index 0627e1bd2c..4ab55f2541 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,9 +1,11 @@
 {
   "compilerOptions": {
     "target": "es5",
-    "module": "commonjs",
+    "module": "es2015",
+    "moduleResolution": "bundler",
     "lib": [ "dom", "esnext" ],
     "allowJs": true,
+    // "checkJs": true,
     "jsx": "preserve",
     "noEmit": true,
     "strict": true,