Added build targeting esm module (#659)

Author: Balearica

package-lock.json

@@ -8,7 +8,7 @@
   "jsdelivr": "dist/tesseract.min.js",
   "scripts": {
     "start": "node scripts/server.js",
-    "build": "rimraf dist && webpack --config scripts/webpack.config.prod.js",
+    "build": "rimraf dist && webpack --config scripts/webpack.config.prod.js && rollup -c scripts/rollup.esm.js",
     "profile:tesseract": "webpack-bundle-analyzer dist/tesseract-stats.json",
     "profile:worker": "webpack-bundle-analyzer dist/worker-stats.json",
     "prepublishOnly": "npm run build",
@@ -37,6 +37,7 @@
   "devDependencies": {
     "@babel/core": "^7.18.7",
     "@babel/preset-env": "^7.18.7",
+    "@rollup/plugin-commonjs": "^22.0.2",
     "acorn": "^6.4.0",
     "babel-loader": "^8.2.0",
     "buffer": "^6.0.3",
@@ -51,6 +52,7 @@
     "npm-run-all": "^4.1.5",
     "nyc": "^15.1.0",
     "rimraf": "^2.7.1",
+    "rollup": "^2.79.0",
     "wait-on": "^3.3.0",
     "webpack": "^5.74.0",
     "webpack-bundle-analyzer": "^4.6.0",

package.json

@@ -0,0 +1,13 @@
+import commonjs from "@rollup/plugin-commonjs";
+
+export default [
+  {
+    input: "dist/tesseract.min.js",
+    output: {
+      file: "dist/tesseract.esm.min.js",
+      format: "esm",
+      banner: "/* eslint-disable */",
+    },
+    plugins: [commonjs()],
+  },
+];