rollup-plugin-incremental

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rollup-plugin-incremental

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A Rollup plugin which makes your (development) builds much faster, by recompiling only changed modules.

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[npm]: https://img.shields.io/npm/v/@mprt/rollup-plugin-incremental
[npm-url]: https://www.npmjs.com/package/@mprt/rollup-plugin-incremental
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# @mprt/rollup-plugin-incremental
A Rollup plugin which makes your (development) builds much faster, by recompiling only changed modules.

## Requirements

This plugin requires at least rollup@2.33.1

## Install

Using yarn or npm:

```console
yarn add -D @mprt/rollup-plugin-incremental

npm install @mprt/rollup-plugin-incremental --save-dev
```

## Usage

```js
//some imports ...
import incremental from '@mprt/rollup-plugin-incremental'

export default {
    input: 'src/index.js',
    //ATTENTION: treeshaking must be disabled!
    treeshake: false,
    //ATTENTION: there is must be only one output! 
    output: {
        dir: 'dist',
        format: 'esm',
        //ATTENTION: preserveModules must be enabled!
        preserveModules: true,
        preserveModulesRoot: 'src',
        //ATTENTION: minifyInternalExports must be disabled!
        minifyInternalExports: false,
    },
    plugins: [
        //ATTENTION: plugin very likely should be first!
        //BTW, this plugin is noop without watch mode 
        incremental(),  
        
        //another plugins...
        
        //ATTENTION: this fixes issues with syntheticNamedExports in commonjs modules
        //it should be last 
        incremental.fixSNE(),
    ],
}
```
And then...
```console
rollup -cw
```
NOTE: You MUST use watch mode with this plugin.

There is simple typical ts, react and mobx web app in example folder.

First build will take same time as usual, but second and next builds should be really fast - below a second.

## Gotchas

- If changed file is not directly transpiles to module (ie: some babel config), then full rebuild triggered.
- If error occurs during incremental build, all changed modules will be rebuild again on next build
- Currently it works by replacing `input` option on incremental builds, so it cannot work with another plugins which
works with `input`, i.e. multi-entry plugin

## Inter-plugin API

This plugin exposes next [API](https://rollupjs.org/guide/en/#direct-plugin-communication):

```ts
interface IncrementalAPI {
    /** Is current (or last, if there is no current) build is incremental? */
    readonly incrementalBuild: boolean 
    /** Ids of changed modules, which triggers incremental build. Null if build is not incremental */
    readonly changedModules: null | Set<string>
}
```

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