Fixes for older versions of node (#101)

* Changes "main" to commonjs export for old node versions, specifies jsdelivr export path to ESM export, sets commonjs target to lower ESM version to support node 8

* Compile ESM version to ES2017 as well

* 2.8.4

Author: tonypconway

package-lock.json

@@ -1,7 +1,7 @@
 {
   "name": "baseline-browser-mapping",
-  "main": "./dist/index.js",
-  "version": "2.8.3",
+  "main": "./dist/index.cjs",
+  "version": "2.8.4",
   "description": "A library for obtaining browser versions with their maximum supported Baseline feature set and Widely Available status.",
   "exports": {
     ".": {
@@ -14,6 +14,7 @@
       "types": "./dist/index.d.ts"
     }
   },
+  "jsdelivr": "./dist/index.js",
   "files": [
     "dist/*",
     "!dist/scripts/*",

package.json

@@ -9,7 +9,11 @@ export default [
       dir: "dist",
     },
     plugins: [
-      typescript({ tsconfig: "./tsconfig.json", outDir: "dist" }),
+      typescript({
+        tsconfig: "./tsconfig.json",
+        outDir: "dist",
+        target: "es2017",
+      }),
       terser(),
     ],
   },
@@ -20,7 +24,11 @@ export default [
       file: "dist/index.cjs",
     },
     plugins: [
-      typescript({ tsconfig: "./tsconfig.json", outDir: "dist" }),
+      typescript({
+        tsconfig: "./tsconfig.json",
+        outDir: "dist",
+        target: "es2017",
+      }),
       terser(),
     ],
   },