@chialab/esbuild-plugin-worker v0.18.1

How it works

Esbuild Plugin Worker looks for new Worker('./path/to/worker.js') statements in JavaScript and TypeScript files and instructs esbuild to treat that references as entrypoints. Final output will be used to correctly update the statement.

For example, the following script:

const worker = new Worker('./path/to/worker.js');

will be transformed to:

const worker = new Worker(new URL('./path/to/worker.js', import.meta.url));

and then resolved by the @chialab/esbuild-plugin-meta-url plugin.

Please note that RNA does not generate a Worker class to instantiate like webpack does, but it will just correctly update the import reference. If you need a Worker class, you have to wrap it yourself:

const workerClass = function() {
    return new Worker('./path/to/worker.js');
};

⚠️ At the moment this plugin does not collect importScript() statements and does treat workers as modules, but we have plan to support the { type: "module" } option in the near future.

Install

$ npm i @chialab/esbuild-plugin-worker -D
$ yarn add @chialab/esbuild-plugin-worker -D

Usage

import esbuild from 'esbuild';
import transfrom from '@chialab/esbuild-plugin-transform';
import workerPlugin from '@chialab/esbuild-plugin-worker';
import metaUrlPlugin from '@chialab/esbuild-plugin-meta-url';

await esbuild.build({
    plugins: [
        transfrom([
            workerPlugin(),
            metaUrlPlugin(),
        ]),
    ],
});

You can also define a list of Worker constructors to use (default it will look for Worker and SharedWorker):

workerPlugin({ constructors: ['Worker', 'MyWorker'] });

License

Esbuild Plugin Worker is released under the MIT license.