Custom Environment Variable Prefix (Instead if `REACT_APP_`)

At my company, we have standard environment variable naming conventions. create-react-apps hard-coded default - REACT_APP_ does not adhere to these. It would be nice to be able to configure these by either:

1. Supplying config in package.json or
2. Passing a flag to the react-scripts command
3. Setting another environment variable? (perhaps too meta)

(1) and (2) would also allow running multiple create-react-app projects with global environment variables as well (as opposed to using the .env files)

Are others running into this?

[heyimalex]

It’s not too bad to do without ejecting.

const spawnSync = require("child_process").spawnSync;

const MY_PREFIX = /^MY_PREFIX_/i;

const transformedEnv = Object.keys(process.env)
  .filter(key => MY_PREFIX.test(key))
  .reduce((env, key) => {
    const craKey = key.replace(MY_PREFIX, "REACT_APP_");
    env[craKey] = process.env[key];
    return env;
  }, {});

spawnSync("npm", ["run", "build"], {
  shell: true,
  stdio: [0, 1, 2],
  env: transformedEnv
});

[miraage]

I think it would be nice to have something like array appEnvVars in package.json. Only these variables along with NODE_ENV and PUBLIC_URL will be passed to the application.