EnvironmentPlugin

new webpack.EnvironmentPlugin(["NODE_ENV", "DEBUG"]);

new webpack.DefinePlugin({
  "process.env.NODE_ENV": JSON.stringify(process.env.NODE_ENV),
  "process.env.DEBUG": JSON.stringify(process.env.DEBUG),
});

new webpack.EnvironmentPlugin({
  NODE_ENV: "development", // use 'development' unless process.env.NODE_ENV is defined
  DEBUG: false,
});

if (process.env.NODE_ENV === "production") {
  console.log("Welcome to production");
}
if (process.env.DEBUG) {
  console.log("Debugging output");
}

if ("production" === "production") {
  // <-- 'production' from NODE_ENV is taken
  console.log("Welcome to production");
}
if (false) {
  // <-- default value is taken
  console.log("Debugging output");
}

if ("development" === "production") {
  // <-- default value is taken
  console.log("Welcome to production");
}
if ("false") {
  // <-- 'false' from DEBUG is taken
  console.log("Debugging output");
}

import childProcess from "node:child_process";

function git(command) {
  return childProcess.execSync(`git ${command}`, { encoding: "utf8" }).trim();
}

new webpack.EnvironmentPlugin({
  GIT_VERSION: git("describe --always"),
  GIT_AUTHOR_DATE: git("log -1 --format=%aI"),
});

// .env
DB_HOST=127.0.0.1
DB_PASS=foobar
S3_API=mysecretkey

new Dotenv({
  path: "./.env", // Path to .env file (this is the default)
  safe: true, // load .env.example (defaults to "false" which does not use dotenv-safe)
});