initial commit

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+dist/
+patch-package.test.tgz

LICENSE

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+Copyright (c) 2018 David Sheldrick
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+postinstall-postinstall
+===================
+
+Run your app's `postinstall` npm script during this package's `postinstall` script.
+
+## Why
+
+Yarn runs the `postinstall` script after `yarn`, `yarn install` and `yarn add <package>` but not after `yarn remove <package>`. If you add this package to your project, it will execute your project's `postinstall` hook even after a `yarn remove <package>`. This requires your `postinstall` script to be idempotent, becase it will be run twice for `yarn`, `yarn install`, and `yarn add <package>`

package.json

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+{
+  "name": "postinstall-postinstall",
+  "version": "1.0.0",
+  "main": "",
+  "scripts": {
+    "postinstall": "node ./run.js"
+  },
+  "files": [
+    "run.js",
+    "README.md",
+    "LICENSE"
+  ],
+  "license": "MIT",
+  "description": "runs your app's postinstall on this lib's postinstall",
+  "repository": "https://github.com/ds300/postinstall-postinstall",
+  "author": "David Sheldrick",
+  "devDependencies": {
+    "np": "^2.20.1"
+  }
+}

run.js

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+const fs = require('fs')
+const cwd = require('process').cwd()
+const path = require('path')
+const exec = require('child_process').execSync
+
+const appPath = path.normalize(cwd.slice(0, cwd.lastIndexOf('node_modules')))
+
+const packageJsonPath = path.join(appPath, 'package.json')
+
+if (fs.existsSync(packageJsonPath)) {
+  const packageJson = JSON.parse(fs.readFileSync(packageJsonPath))
+
+  if (packageJson.scripts && packageJson.scripts.postinstall) {
+    exec('npm run postinstall', {cwd: appPath})
+  }
+}
+
+