Annotate functions as pure for Rollup
npm install rollup-plugin-purerollup-plugin-pure[![npm version][npm-version-src]][npm-version-href]
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> Automatically add / #__PURE__ / annotations before definition functions
- ⚡️ avoids end-users bundling unused code
Definition functions (for example, in Vue with defineComponent) are increasingly common but do not play nice with tree-shaking. It's not possible to tell whether or not a function call which receives an object can be tree-shaken from a build, as it's possible there might be side effects.
Rollup supports / @__PURE__ / annotations to declare this from a library author's point of view, but it can be tricky when we know that _every_ occurrence of a function call is pure.
This plugin will automatically inject the annotation before any occurrence of the function call, as well as injecting / @__NO_SIDE_EFFECTS__ / annotations in front of function declarations.
Install and add rollup-plugin-pure to your Vite or Rollup config.
``bash`
pnpm add -D rollup-plugin-pure
`js
import { PluginPure } from 'rollup-plugin-pure'
import { defineConfig } from 'vite'
export default defineConfig({
plugins: [
PluginPure({
functions: ['defineComponent', /^define(Page|Meta)$/],
include: [/(? // exclude: [],
// sourcemap: true,
}),
],
})
`
- Clone this repository
- Enable Corepack using corepack enablepnpm install
- Install dependencies using pnpm dev:prepare
- Stub module with pnpm dev` to start playground in development mode
- Run
Made with ❤️
Published under the MIT License.
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