feat: export esm entrypoint

Author: manzt

package-lock.json

@@ -3,15 +3,24 @@
   "version": "1.9.2",
   "description": "Blazing-fast binary parser builder",
   "main": "dist/binary_parser.js",
+  "module": "dist/esm/binary-parser.mjs",
   "devDependencies": {
     "@types/node": "^16.9.1",
     "mocha": "^9.1.1",
     "nyc": "^15.1.0",
     "prettier": "^2.4.0",
     "typescript": "^4.4.3"
   },
+  "exports": {
+    ".": {
+      "import": "./dist/esm/binary_parser.mjs",
+      "require": "./dist/binary-parser.js"
+    },
+    "./*": "./*"
+  },
   "scripts": {
-    "build": "tsc",
+    "build": "tsc && npm run build:esm",
+    "build:esm": "tsc --target esnext --module esnext --outDir dist/esm && node rename",
     "fmt": "prettier --write \"{lib,example,test,benchmark}/**/*.{ts,js}\"",
     "check-fmt": "prettier --list-different \"{lib,example,test,benchmark}/**/*.{ts,js}\"",
     "test": "mocha",
@@ -20,8 +29,7 @@
     "prepare": "npm run build"
   },
   "files": [
-    "dist/*.js",
-    "dist/*.d.ts"
+    "dist/**/*.{js,mjs,d.ts}"
   ],
   "keywords": [
     "binary",

package.json

@@ -0,0 +1,20 @@
+const fs = require('fs');
+const path = require('path');
+
+const outdir = path.resolve(__dirname, 'dist', 'esm');
+
+const renameMjs = (path) => fs.promises.rename(path, path.replace('.js', '.mjs'));
+
+const main = async () => {
+
+  // replace import
+  let fp = path.join(outdir, 'binary_parser.js');
+  const contents = await fs.promises.readFile(fp, { encoding: 'utf8' });
+  await fs.promises.writeFile(fp, contents.replace('"./context"', '"./context.mjs"'));
+
+  // change filenames
+  renameMjs(fp);
+  renameMjs(path.join(outdir, 'context.js'));
+}
+
+main()