build.ts

import esbuild from 'esbuild';
import path from 'path';
import fs from 'fs';
import { fileURLToPath } from 'url';

const dirname = path.dirname(fileURLToPath(import.meta.url));

build(path.join(dirname, '../node_modules/assert'), path.join(dirname, '../shim/assert.mjs'));

/** build */
function build(input: string, out: string, injects: string[] = []) {
	// eslint-disable-next-line no-console -- ignore
	console.log(`build@ ${input}`);
	let code = bundle(input, ['path', ...injects]);
	code = transform(code, ['path', ...injects]);
	fs.writeFileSync(out, code, 'utf8');
}

/** bundle */
function bundle(entryPoint: string, externals: string[]) {
	const result = esbuild.buildSync({
		entryPoints: [entryPoint],
		format: 'esm',
		bundle: true,
		external: externals,
		write: false,
		inject: [path.join(dirname, './src/process-shim.mjs')]
	});

	return `${result.outputFiles[0].text}`;
}

/** transform code */
function transform(code: string, injects: string[]) {
	const newCode = code.replace(/"[a-z]+" = "[a-z]+";/, '');
	// const newCode = babelCore.transformSync(code, {
	//   babelrc: false,
	//   plugins: [
	//     {
	//       visitor: {
	//         CallExpression(path) {
	//           const callee = path.get("callee")
	//           if (
	//             callee.type === "Identifier" &&
	//             callee.node.name === "__require"
	//           ) {
	//             callee.replaceWith(t.identifier("__$$$require"))
	//           }
	//         },
	//       },
	//     },
	//   ],
	// })
	return `
${injects
	.map((inject) => `import $inject_${inject.replace(/-/g, '_')}$ from '${inject}';`)
	.join('\n')}
const $_injects_$ = {${injects
		.map((inject) => `${inject.replace(/-/g, '_')}:$inject_${inject}$`)
		.join(',\n')}};
function require(module, ...args) {
  return $_injects_$[module] || {}
}
${newCode}
`;
}