node-stdlib-browser/helpers/esbuild/plugin.js

Node standard library for browser.

'use strict';

/**
 * @typedef {import('../../')} Packages
 * @typedef {import('esbuild').Plugin} esbuild.Plugin
 */

const { promisify } = require('util');
const browserResolve = require('browser-resolve');

const pBrowserResolve = promisify(browserResolve);

const plugin = (
	/** @type {Packages | {[key: string]: string}} */ stdLibBrowser
) => {
	/** @type {esbuild.Plugin} */
	const main = {
		name: 'node-stdlib-browser-alias',
		async setup(build) {
			const map = new Map();
			const promises = Object.entries(stdLibBrowser).map(
				async ([name, path]) => {
					// @ts-ignore
					const resolvedPath = await pBrowserResolve(path, {});
					map.set(name, resolvedPath);
				}
			);
			await Promise.all(promises);

			map.forEach((path, name) => {
				build.onResolve({ filter: new RegExp(`^${name}$`) }, () => {
					return {
						path
					};
				});
			});
		}
	};
	return main;
};

module.exports = plugin;