Use ts-loader with webpack to avoid needing to compile lib-es3.

.eslintignore

@@ -4,4 +4,3 @@ demo/markdownlint-browser.min.js
 demo/markdownlint-rule-helpers-browser.js
 demo/markdownlint-rule-helpers-browser.min.js
 example/typescript/type-check.js
-lib-es3/

.gitignore

@@ -3,7 +3,6 @@ demo/markdown-it.min.js
 demo/markdownlint-browser.min.js
 demo/markdownlint-browser.min.js.LICENSE.txt
 demo/markdownlint-rule-helpers-browser.*
-lib-es3
 node_modules
 !test/node_modules
 npm-debug.log

.npmignore

@@ -8,7 +8,6 @@ coverage
 demo/*
 !demo/markdownlint-browser.js
 example
-lib-es3
 npm-debug.log
 test
 test-repos

demo/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "compilerOptions": {
+    "allowJs": true,
+    "resolveJsonModule": true
+  },
+  "include": [
+    "../lib/*.js"
+  ]
+}

demo/webpack.config.js

@@ -2,6 +2,7 @@
 
 "use strict";
 
+const path = require("path");
 const webpack = require("webpack");
 
 function config(options) {
@@ -14,6 +15,21 @@ function config(options) {
       "markdown-it": "markdownit"
     },
     "mode": mode,
+    "module": {
+      "rules": [
+        {
+          "test": /.js$/,
+          "use": [
+            {
+              "loader": "ts-loader",
+              "options": {
+                "configFile": path.resolve(__dirname, "tsconfig.json")
+              }
+            }
+          ]
+        }
+      ]
+    },
     "name": name,
     "output": {
       "filename": filename,
@@ -41,25 +57,25 @@ function config(options) {
 
 module.exports = [
   config({
-    "entry": "../lib-es3/lib/markdownlint.js",
+    "entry": "../lib/markdownlint.js",
     "filename": "markdownlint-browser.js",
     "mode": "development",
     "packageJson": require("../package.json")
   }),
   config({
-    "entry": "../lib-es3/lib/markdownlint.js",
+    "entry": "../lib/markdownlint.js",
     "filename": "markdownlint-browser.min.js",
     "mode": "production",
     "packageJson": require("../package.json")
   }),
   config({
-    "entry": "../lib-es3/helpers/helpers.js",
+    "entry": "../helpers/helpers.js",
     "filename": "markdownlint-rule-helpers-browser.js",
     "mode": "development",
     "packageJson": require("../helpers/package.json")
   }),
   config({
-    "entry": "../lib-es3/helpers/helpers.js",
+    "entry": "../helpers/helpers.js",
     "filename": "markdownlint-rule-helpers-browser.min.js",
     "mode": "production",
     "packageJson": require("../helpers/package.json")

package.json

@@ -21,7 +21,7 @@
     "ci": "npm run test-cover && npm run lint && npm run build-declaration && npm run test-declaration && npm run build-config-schema && git diff --exit-code",
     "build-config-schema": "node schema/build-config-schema.js",
     "build-declaration": "tsc --allowJs --declaration --emitDeclarationOnly --resolveJsonModule lib/markdownlint.js && rimraf 'lib/{c,md,r}*.d.ts' 'helpers/*.d.ts'",
-    "build-demo": "cpy node_modules/markdown-it/dist/markdown-it.min.js demo && cd demo && rimraf markdownlint-browser.* && tsc --allowJs --resolveJsonModule --outDir ../lib-es3 ../lib/markdownlint.js && cpy ../helpers/package.json ../lib-es3/helpers && webpack",
+    "build-demo": "cpy node_modules/markdown-it/dist/markdown-it.min.js demo && cd demo && rimraf markdownlint-browser.* && webpack",
     "build-example": "npm install --no-save --ignore-scripts grunt grunt-cli gulp through2",
     "example": "cd example && node standalone.js && grunt markdownlint --force && gulp markdownlint",
     "clone-test-repos": "mkdir test-repos && cd test-repos && git clone https://github.com/eslint/eslint eslint-eslint --depth 1 --no-tags --quiet && git clone https://github.com/mkdocs/mkdocs mkdocs-mkdocs --depth 1 --no-tags --quiet && git clone https://github.com/pi-hole/docs pi-hole-docs --depth 1 --no-tags --quiet",
@@ -55,6 +55,7 @@
     "tape": "~5.0.1",
     "tape-player": "~0.1.1",
     "toml": "~3.0.0",
+    "ts-loader": "~8.0.14",
     "tv4": "~1.3.0",
     "typescript": "~4.1.2",
     "webpack": "~5.11.1",