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angular - How to insert a Build Number or Timestamp at build time in AngularCLI

I want to have a timestamp or build number somewhere on my Angular2 App so I can tell if a user is using an old cached version or not.

How to do this with AngularCLI in Angular2 at AOT compile/build time?

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  1. Install plugin npm install replace-in-file --save-dev
  2. Add to prod environment src/environments/environment.prod.ts new property

    export const environment = {
        production: true,
        version: '{BUILD_VERSION}'
    }
    
  3. Add build file replace.build.js to root of your folder

    var replace = require('replace-in-file');
    var buildVersion = process.argv[2];
    const options = {
        files: 'src/environments/environment.prod.ts',
        from: /{BUILD_VERSION}/g,
        to: buildVersion,
        allowEmptyPaths: false,
    };
    
    try {
        let changedFiles = replace.sync(options);
        console.log('Build version set: ' + buildVersion);
    }
    catch (error) {
        console.error('Error occurred:', error);
    }
    
  4. add scripts to package.json

    "updateBuild": "node ./replace.build.js"
    
  5. Use environment.version in your app

  6. Before build call npm run updateBuild -- 1.0.1

PS. You must always remember that {BUILD_VERSION} is never committed.

PS. I wrote a bit better solution in my blog

PS.3 as @julien-100000 mentioned you should not commit environment.prod.ts with updated version. Version update must happen only in build process. And should never be committed.


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