onPostBuild lifecycle event doesn't exist

Describe the bug

I receive the following error when using a simple Netlify build plugin with the onPostBuild lifecycle handler. I have been testing with the official sitemap plugin.

Error: Invalid lifecycle hook 'onPostBuild'.
Please use a valid event name. One of:
"init", "preGetCache", "getCache", "postGetCache", "preInstall", "install", "postInstall", "preBuild", "preFunctionsBuild", "functionsBuild", "postFunctionsBuild", "build", "postBuild", "prePackage", "package", "postPackage", "preDeploy", "preSaveCache", "saveCache", "postSaveCache", "finally", "onError"

Steps to reproduce

Environment:

> netlify --version
netlify-cli/2.25.0 darwin-x64 node-v12.11.0

I am using the latest version of Netlify Cli cloned from git and using npm link so it can be used globally.

Install the netlify-plugin-sitemap into a project or use the basic plugin code below and then run netlify build, this command should throw the error.

module.exports = {
  name: '@netlify/plugin-http2',
  onPostBuild: async ({ constants, pluginConfig }) => {
    console.log('POST BUILD');
  }
};

Expected behavior

It should not report an error and the lifecycle event should be called at the correct point in the build. I assume this lifecycle method still exists as it is in the README.

Environment

npx: installed 1 in 3.39s

  System:
    OS: macOS 10.15.2
    CPU: (4) x64 Intel(R) Core(TM) i5-5350U CPU @ 1.80GHz
    Memory: 51.02 MB / 8.00 GB
    Shell: 5.7.1 - /bin/zsh
  Binaries:
    Node: 12.11.0 - ~/.nvm/versions/node/v12.11.0/bin/node
    Yarn: 1.19.0 - /usr/local/bin/yarn
    npm: 6.13.4 - ~/.nvm/versions/node/v12.11.0/bin/npm

[oscartbeaumont]

Sorry to waste your time, after clearing node_modules and package-lock.json and reinstalling everything has started working.

[ehmicky]

No worries! Feel free to post any issues you might encounter 😃