Rewire react app with custom environment variables (buildtime)

How to use:

npm install react-rewired-buildtime-env

config-overrides.js

const { rewireWithEnv } = require('react-rewired-buildtime-env');
const customVarName = 'CUSTOM_VAR_NAME';

module.exports = (webpackConfig) => {
    const withCustomEnvConfig = rewireWithEnv({
        webpackConfig,
        envKey: 'CUSTOM_ENV_VAR',
        commands: {
            gitCommit: 'git rev-parse --short HEAD',
            npmVersion: 'npm -v',
            ...
        },
        vars: {
            var1: 'CUSTOM_VARIABLE',
            [customVarName]: '<custom var value>'
        }
    });

    return withCustomEnvConfig;
}

Output at process.env.CUSTOM_ENV_VAR:

{
    gitCommit: "8e86fab"
    npmVersion: "8.3.1",
    var1: "CUSTOM_VARIABLE",
    CUSTOM_VAR_NAME: '<custom var value>'
}

Working with custom scripts:

• having a custom script at a certain path (e.g: 'src/scripts/myCustomScript.js)
• add it to package.json

   "scripts": {
      "myScript": "node src/scripts/myCustomScript.js",
  }

• then, in config-overrides.js

  module.exports = (webpackConfig) => {
      const withCustomEnvConfig = rewireWithEnv({
          webpackConfig,
          envKey: 'CUSTOM_ENV_VAR',
          commands: {
              myScriptResult: 'npm run myScript'
          }
      });
  
      return withCustomEnvConfig;
  }

Arguments (default values):

• webpackConfig,

• envKey = 'BUILDTIME_ENV',

• commands = {},

• vars = {},

• debug = false,

• formatter = null (function)

  module.exports = (webpackConfig) => {
      const withCustomEnvConfig = rewireWithEnv({
          webpackConfig,
          envKey: 'CUSTOM_ENV_VAR',
          commands: {},
          vars: {},
          debug: true,
          formatter: (res) => {
              // by default, when there are multiple lines
              // the result will be an array of lines
  
              let response = res.trim().split('\n');
  
              // get rid of unnecessary stuff
              if(response.includes('*')) {
                  response = response.replace('*', '');
              }
  
              return response;
          }
      });
  
      return withCustomEnvConfig;
  }