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rollup-plugin-off-main-thread
Use Rollup with workers and ES6 modules today.
$ npm install --save @surma/rollup-plugin-off-main-thread
Workers are JavaScript’s version of threads. Workers are important to use as the main thread is already overloaded, especially on slower or older devices.
This plugin takes care of shimming module support in workers and allows you to use new Worker()
.
OMT is the result of merging loadz0r and workz0r.
Usage
I set up a gist to show a full setup with OMT.
Config
// rollup.config.js
import OMT from "@surma/rollup-plugin-off-main-thread";
export default {
input: ["src/main.js"],
output: {
dir: "dist",
// You _must_ use either “amd” or “esm” as your format.
// But note that only very few browsers have native support for
// modules in workers.
format: "amd"
},
plugins: [OMT()]
};
Auto bundling
In your project's code:
const worker = new Worker("./worker.js", { type: "module" });
This will just work.
Importing workers as URLs
If your worker constructor doesn't match workerRegexp
(see options below), you might find it easier to import the worker as a URL. In your project's code:
import workerURL from "omt:./worker.js";
import paintWorkletURL from "omt:./paint-worklet.js";
const worker = new Worker(workerURL, { name: "main-worker" });
CSS.paintWorklet.addModule(paintWorkletURL);
./worker.js
and ./paint-worklet.js
will be added to the output as chunks.
Options
{
// ...
plugins: [OMT(options)];
}
loader
: A string containing the EJS template for the amd loader. Ifundefined
, OMT will useloader.ejs
.useEval
: Usefetch()
+eval()
to load dependencies instead of<script>
tags andimportScripts()
. This is not CSP compliant, but is required if you want to use dynamic imports in ServiceWorker.workerRegexp
: A RegExp to findnew Workers()
calls. The second capture group must capture the provided file name without the quotes.amdFunctionName
: Function name to use instead of AMD’sdefine
.prependLoader
: A function that determines whether the loader code should be prepended to a certain chunk. Should return true if the load is suppsoed to be prepended.urlLoaderScheme
: Scheme to use when importing workers as URLs. Ifundefined
, OMT will use"omt"
.
License Apache-2.0