Access process.env in environment.ts file created from the angular-cli

Question

I have an angular-cli application (angular version 4.0.0). I want to be able to access my environment variables in the environment.ts file created from the cli.

Example:

export SOME_VARIABLE=exampleValue

When I build my angular app I want "exampleValue" to be populated in the SOME_VARIABLE field.

// environment.ts

export const environment = {
    production: false,
    SOME_VARIABLE: process.env.SOME_VARIABLE
};

Unfortunately, process.env isn't available in this file. How can I gain access to it?

Answer 1

One way to solve this is to create a node script, which replaces a place holder.

This can be done with replace-in-file from npm.

A solution can look like this:

1. npm install replace-in-file --save-dev

2. Create a place holder

    export const environment = { production: true, version: '{BUILD_VERSION}' } 

3. Create node script to replace the place holder (replace.build.js in root folder)

    var replace = require('replace-in-file'); var buildVersion = process.env.BUILD_NUMBER; const options = { files: 'environments/environment.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. Execute this node script in your build process fe in gulp

    gulp.task('updateVersion', function (done) { exec('node ./replace.build.js', function (err, stdout, stderr) { console.log(stdout); console.log(stderr); done(); }); }); 

Now you can use environment.version in your app.