chore: Add esbuild (Breaking change)

mermaid.min.js and mermaid.js will now be IIFE instead of UMD.

.esbuild/build.ts

@@ -0,0 +1,34 @@
+import { build } from 'esbuild';
+import { mkdir, writeFile } from 'node:fs/promises';
+import { getBuildConfig } from './util.js';
+import { packageOptions } from '../.build/common.js';
+
+const shouldVisualize = process.argv.includes('--visualize');
+
+const buildPackage = async (entryName: keyof typeof packageOptions) => {
+  await build(getBuildConfig({ entryName, minify: false }));
+  const { metafile } = await build(
+    getBuildConfig({ entryName, minify: true, metafile: shouldVisualize })
+  );
+  if (metafile) {
+    // Upload metafile into https://esbuild.github.io/analyze/
+    await writeFile(`stats/meta-${entryName}.json`, JSON.stringify(metafile));
+  }
+  await build(getBuildConfig({ entryName, minify: false, core: true }));
+  await build(getBuildConfig({ entryName, minify: true, format: 'iife' }));
+};
+
+const handler = (e) => {
+  console.error(e);
+  process.exit(1);
+};
+
+const main = async () => {
+  await mkdir('stats').catch(() => {});
+  const packageNames = Object.keys(packageOptions) as (keyof typeof packageOptions)[];
+  for (const pkg of packageNames) {
+    await buildPackage(pkg).catch(handler);
+  }
+};
+
+void main();