Including git commit hash and date in webpack build

I'm using react/es6/webpack. I want to show the date of the build and git hash somewhere in my app. What's the best approach?

You can use webpack's DefinePlugin:

// get git info from command line
let commitHash = require('child_process')
  .execSync('git rev-parse --short HEAD')
  .toString()
  .trim();

...
plugins: [
    new webpack.DefinePlugin({
      __COMMIT_HASH__: JSON.stringify(commitHash)
    })
  ]
...

Then you can use it in your app with __COMMIT_HASH__

Another way of doing this is ( in ANGULAR + REACT ) :

Just install this package git-revision-webpack-plugin

Simple webpack plugin that generates VERSION and COMMITHASH files during build based on a local git repository.

Sample Code :

Inside your webpack.config.js (or any dev - prod file)

const GitRevisionPlugin = require('git-revision-webpack-plugin');
const gitRevisionPlugin = new GitRevisionPlugin();

plugins: [
    new DefinePlugin({
      'VERSION': JSON.stringify(gitRevisionPlugin.version()),
      'COMMITHASH': JSON.stringify(gitRevisionPlugin.commithash()),
      'BRANCH': JSON.stringify(gitRevisionPlugin.branch()),
    }),
  ]

In your Component (React):

export class Home extends Component{
    ....

    render() {
        return(
            <div>
                {VERSION} 
                {COMMITHASH}
                {BRANCH}
            </div>
        )
    }
}

In your Template (Angular):

{{ VERSION }} 
{{ COMMITHASH }}
{{ BRANCH }}

I couldn't comment to the top post, so here goes:

Webpack.dev.js

import gitprocess from "child_process"
let LoadCommitDate = gitprocess
  .execSync('git log -1 --date=format:"%Y/%m/%d %T" --format="%ad"')
  .toString()
...
plugins: [
    new webpack.DefinePlugin({
       COMMITDATE: JSON.stringify(LoadCommitDate),
    })
  ]

Additionally in .eslintrc

  "globals": {
    "COMMITDATE": "readonly",
  },

Result - latest commit date you can reference in your code!

console.log(COMMITDATE)
2020/05/04 21:02:03