Tips for excluding files from compilation when they are not in use

Currently, I am working on a TypeScript project where I need to generate an output file based on certain conditions (dependent on the environment). Below is a simplified example of the code snippet. I am utilizing webpack for building the project.

testComponent.ts

export const someComponent = () => {
  console.log("This is Some Component");
};

index.ts

import { someComponent } from "./components/testComponent";

let goTo = 1;

if (goTo === 1) {
  console.log("Will go to this");
} else {
  someComponent();
}

In the scenario above, since the compiler will never reach the `else` block, the code from `testComponent.ts` should not be compiled into the output file. However, the current output generated is as follows:

(() => {
  "use strict";
  var o = {
      310: (o, e) => {
        Object.defineProperty(e, "__esModule", { value: !0 }),
          (e.someComponent = void 0),
          (e.someComponent = function () {
            console.log("This is Some Component");
          });
      },
    },
    e = {};
  function t(n) {
    var r = e[n];
    if (void 0 !== r) return r.exports;
    var s = (e[n] = { exports: {} });
    return o[n](s, s.exports, t), s.exports;
  }
  t(310), console.log("Will go to this");
})();

For reference, here is the webpack configuration being used:

const path = require("path");

const bundleOutputDir = "./dist";

module.exports = (env) => {
  return {
    entry: "./src/index.ts",
    output: {
      filename: "output.js",
      path: path.resolve(bundleOutputDir),
    },
    devServer: {
      contentBase: bundleOutputDir,
    },
    plugins: [],
    module: {
      rules: [
        {
          test: /\.ts?$/,
          use: "ts-loader",
          exclude: /node_modules/,
        },
      ],
    },
    resolve: {
      extensions: [".ts", ".js"],
      alias: {
        "@": path.resolve(__dirname, "src"),
      },
    },
    mode: "production",
  };
};

If anyone could provide assistance with resolving this issue, it would be greatly appreciated. Thank you in advance.

I am hoping to remove the code from `testComponent.ts` from the output file.

Answer №1

goTo means:

  • const, meaning it is not changeable
  • a constant

In order to optimize for tree shaking, consider using const goTo or possibly if (true)

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