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

问题

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?

回答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:

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

Create a place holder

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

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);
}

Execute this node script in your build process f.e. 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.

来源：https://stackoverflow.com/questions/43497373/access-process-env-in-environment-ts-file-created-from-the-angular-cli

标签

angular

angular-cli