fix: use esbuild for accurate sourcemaps

.github/workflows/tests.yml

@@ -31,6 +31,8 @@ jobs:
         run: npm run test:unit
       - name: Run Spec Tests 👩🏽‍💻
         run: npm run test:specs
+      - name: Run CJS Tests 👩🏽‍💻
+        run: npm run test:cjs
 
   OtherTests:
     runs-on: ubuntu-latest

esbuild.config.js

@@ -0,0 +1,61 @@
+import * as esbuild from 'esbuild';
+import { umdWrapper } from 'esbuild-plugin-umd-wrapper';
+import fs from 'fs';
+
+const version = process.env.SEMANTIC_RELEASE_NEXT_VERSION || JSON.parse(fs.readFileSync('./package.json')).version;
+
+console.log('building version:', version);
+
+const banner = `/**
+ * marked v${version} - a markdown parser
+ * Copyright (c) 2011-${new Date().getFullYear()}, Christopher Jeffrey. (MIT Licensed)
+ * https://github.com/markedjs/marked
+ */
+
+/**
+ * DO NOT EDIT THIS FILE
+ * The code in this file is generated from files in ./src/
+ */
+`;
+
+function config(options) {
+  return {
+    entryPoints: ['src/marked.ts'],
+    banner: {
+      js: banner,
+    },
+    sourcemap: true,
+    bundle: true,
+    minify: false,
+    ...(options.format === 'umd'
+      ? {
+        plugins: [umdWrapper({
+          libraryName: 'marked',
+        })],
+      }
+      : {}),
+    ...options,
+  };
+}
+
+await esbuild.build(config({
+  format: 'esm',
+  outfile: 'lib/marked.esm.js',
+}));
+
+await esbuild.build(config({
+  format: 'cjs',
+  outfile: 'lib/marked.cjs',
+}));
+
+await esbuild.build(config({
+  format: 'umd',
+  outfile: 'lib/marked.umd.js',
+}));
+
+await esbuild.build(config({
+  sourcemap: false,
+  minify: true,
+  format: 'umd',
+  outfile: 'marked.min.js',
+}));