feat(sdk-core): add ESM build support

Add dual CJS/ESM build to enable Turbopack compatibility.

- Add tsconfig.esm.json for ES module build
- Update tsconfig.json to output to dist/cjs
- Add conditional exports and module field in package.json
- Fix lodash import syntax for ESM compatibility

SCAAS-2084

Author: ananth99

modules/sdk-core/package.json

@@ -2,15 +2,32 @@
   "name": "@bitgo/sdk-core",
   "version": "36.22.0",
   "description": "core library functions for BitGoJS",
-  "main": "./dist/src/index.js",
-  "types": "./dist/src/index.d.ts",
+  "main": "./dist/cjs/src/index.js",
+  "module": "./dist/esm/index.js",
+  "browser": "./dist/esm/index.js",
+  "types": "./dist/cjs/src/index.d.ts",
   "files": [
-    "dist"
+    "dist/cjs",
+    "dist/esm"
   ],
+  "exports": {
+    ".": {
+      "import": {
+        "types": "./dist/esm/index.d.ts",
+        "default": "./dist/esm/index.js"
+      },
+      "require": {
+        "types": "./dist/cjs/src/index.d.ts",
+        "default": "./dist/cjs/src/index.js"
+      }
+    }
+  },
   "scripts": {
     "test": "yarn unit-test",
     "unit-test": "nyc -- mocha --recursive test",
-    "build": "yarn tsc --build --incremental --verbose .",
+    "build": "yarn build:cjs && yarn build:esm",
+    "build:cjs": "yarn tsc --build --incremental --verbose .",
+    "build:esm": "yarn tsc --project tsconfig.esm.json",
     "fmt": "prettier --write .",
     "check-fmt": "prettier --check '**/*.{ts,js,json}'",
     "clean": "rm -r ./dist",

modules/sdk-core/src/bitgo/tss/eddsa/eddsa.ts

@@ -23,7 +23,7 @@ import {
 } from '../../utils';
 import { BaseTransaction } from '../../../account-lib';
 import { Ed25519Bip32HdTree } from '@bitgo/sdk-lib-mpc';
-import _ = require('lodash');
+import _ from 'lodash';
 import { commonVerifyWalletSignature, getTxRequest, sendSignatureShare } from '../common';
 import { IRequestTracer } from '../../../api';
 

modules/sdk-core/tsconfig.esm.json

@@ -0,0 +1,17 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist/esm",
+    "rootDir": "./src",
+    "module": "ES2020",
+    "target": "ES2020",
+    "moduleResolution": "bundler",
+    "lib": ["ES2020", "DOM"],
+    "declaration": true,
+    "declarationMap": true,
+    "skipLibCheck": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "test", "dist"],
+  "references": []
+}

modules/sdk-core/tsconfig.json

@@ -1,8 +1,10 @@
 {
   "extends": "../../tsconfig.json",
   "compilerOptions": {
-    "outDir": "./dist",
+    "outDir": "./dist/cjs",
     "rootDir": "./",
+    "module": "node16",
+    "moduleResolution": "node16",
     "strictPropertyInitialization": false,
     "esModuleInterop": true,
     "typeRoots": ["../../types", "./node_modules/@types", "../../node_modules/@types"]