mirror of https://github.com/jkjoy/sunpeiwen.git
98 lines
3.0 KiB
Markdown
98 lines
3.0 KiB
Markdown
|
# 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][when workers] 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
|
|||
|
|
|
|||
|
|
```js
|
|||
|
|
// 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 use a module-relative path via `new URL` to include a Worker:
|
|||
|
|
|
|||
|
|
```js
|
|||
|
|
const worker = new Worker(new URL("worker.js", import.meta.url), {
|
|||
|
|
type: "module"
|
|||
|
|
});
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
This will just work.
|
|||
|
|
|
|||
|
|
If required, the plugin also supports plain literal paths:
|
|||
|
|
|
|||
|
|
```js
|
|||
|
|
const worker = new Worker("./worker.js", { type: "module" });
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
However, those are less portable: in Rollup they would result in module-relative
|
|||
|
|
path, but if used directly in the browser, they'll be relative to the document
|
|||
|
|
URL instead.
|
|||
|
|
|
|||
|
|
Hence, they're deprecated and `new URL` pattern is encouraged instead for portability.
|
|||
|
|
|
|||
|
|
### 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:
|
|||
|
|
|
|||
|
|
```js
|
|||
|
|
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
|
|||
|
|
|
|||
|
|
```js
|
|||
|
|
{
|
|||
|
|
// ...
|
|||
|
|
plugins: [OMT(options)];
|
|||
|
|
}
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
- `loader`: A string containing the EJS template for the amd loader. If `undefined`, OMT will use `loader.ejs`.
|
|||
|
|
- `useEval`: Use `fetch()` + `eval()` to load dependencies instead of `<script>` tags and `importScripts()`. _This is not CSP compliant, but is required if you want to use dynamic imports in ServiceWorker_.
|
|||
|
|
- `workerRegexp`: A RegExp to find `new Workers()` calls. The second capture group _must_ capture the provided file name without the quotes.
|
|||
|
|
- `amdFunctionName`: Function name to use instead of AMD’s `define`.
|
|||
|
|
- `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. If `undefined`, OMT will use `"omt"`.
|
|||
|
|
|
|||
|
|
[when workers]: https://dassur.ma/things/when-workers
|
|||
|
|
[a gist]: https://gist.github.com/surma/a02db7b53eb3e7870bf539b906ff6ff6
|
|||
|
|
|
|||
|
|
---
|
|||
|
|
|
|||
|
|
License Apache-2.0
|