feat(pack): impl usePackageJsonPlugin plugin

Author: yarastqt

packages/pack/README.md

@@ -248,6 +248,20 @@ type Options = {
 function useTypeScriptPlugin(options: Options): TypeScriptPlugin
 ```
 
+### PackageJsonPlugin
+
+A plugin that copy package.json and modify content. _(Run at `onFinish` step)._
+
+#### Usage
+
+```js
+const { usePackageJsonPlugin } = require('@bem-react/pack/lib/plugins/PackageJsonPlugin')
+
+usePackageJsonPlugin({
+  scripts: {},
+})
+```
+
 ## 🏗 Write own plugin
 
 The plugin can perform an action on one of the available hook `onBeforeRun`, `onRun` and `onAfterRun`.

packages/pack/src/plugins/PackageJsonPlugin.ts

@@ -0,0 +1,30 @@
+import { existsSync, writeFileSync } from 'fs-extra'
+import { resolve } from 'path'
+import { Plugin, OnDone, HookOptions } from '../interfaces'
+import { mark } from '../debug'
+
+type Overrides = Record<string, any>
+
+export class PackageJsonPlugin implements Plugin {
+  name = 'PackageJsonPlugin'
+
+  constructor(private overrides: Overrides) {
+    mark('PackageJsonPlugin::constructor')
+  }
+
+  async onFinish(done: OnDone, { context, output }: HookOptions) {
+    mark('PackageJsonPlugin::onFinish(start)')
+    if (!existsSync(resolve(context, 'package.json'))) {
+      throw new Error('Cannot find package.json.')
+    }
+    const pkg = require(resolve(context, 'package.json'))
+    Object.assign(pkg, this.overrides)
+    writeFileSync(resolve(output, 'package.json'), JSON.stringify(pkg, null, 2))
+    mark('PackageJsonPlugin::onFinish(finish)')
+    done()
+  }
+}
+
+export function usePackageJsonPlugin(overrides: Overrides): PackageJsonPlugin {
+  return new PackageJsonPlugin(overrides)
+}