Class CustomTestPlugin

test/watch/watch-variable/webpack.config.js:3–17

const isInProcess = process.env.WEBPACK_WATCH;

class CustomTestPlugin {
  constructor(isInEnvironment) {
    this.isInEnvironment = isInEnvironment;
  }

  apply(compiler) {
    compiler.hooks.done.tap("testPlugin", () => {
      if (!isInProcess && this.isInEnvironment) {
        console.log("PASS");
      } else {
        console.log("FAIL");
      }
    });
  }
}

module.exports = (env) => ({
  mode: "development",