handy-service/config/env.js

> service for handy-cli

const fs = require("fs");
const path = require("path");
const paths = require("./paths");

// Make sure that including paths.js after env.js will read .env variables.
delete require.cache[require.resolve("./paths")];

const { NODE_ENV } = process.env;
if (!NODE_ENV) {
  throw new Error("The NODE_ENV environment variable is required but was not specified.");
}

const appDirectory = fs.realpathSync(process.cwd());
process.env.NODE_PATH = (process.env.NODE_PATH || "")
  .split(path.delimiter)
  .filter(folder => folder && !path.isAbsolute(folder))
  .map(folder => path.resolve(appDirectory, folder))
  .join(path.delimiter);

const REACT_APP = /^REACT_APP_/i;

function getClientEnvironment(publicUrl) {
  const raw = Object.keys(process.env)
    .filter(key => REACT_APP.test(key))
    .reduce(
      (env, key) => {
        env[key] = process.env[key];
        return env;
      },
      {
        NODE_ENV: process.env.NODE_ENV || "development",
        PUBLIC_URL: publicUrl,
        APP_NAME: paths.appName
      }
    );
  const stringified = {
    "process.env": Object.keys(raw).reduce((env, key) => {
      env[key] = JSON.stringify(raw[key]);
      return env;
    }, {})
  };
  return { raw, stringified };
}

module.exports = getClientEnvironment;