Why is it necessary to omit node_modules from webpack configuration?

Check out this webpack configuration file:

module.exports = {
    mode: "development",
    entry: "./src/index.ts",
    output: { filename: "bundle.js" },
    resolve: { extensions: [".ts"] },
    module: {
        rules: [
            { test: /\.ts/, use: "ts-loader", exclude: /node_modules/ }
           }
        ]
    }
};

I'm puzzled by the need to exclude node_modules when dealing with TypeScript files. Here are my thoughts:

1. Most packages are written in JavaScript, not TypeScript, so including node_modules shouldn't cause any issues.

2. If we are using a TypeScript package and want it to compile to JavaScript, then including node_modules seems necessary for everything to work properly, don't you think?

Answer №1

First and foremost, the majority of packages are written in JavaScript rather than TypeScript, so including node_modules should not cause any harm.

However, excluding `node_modules` during the transpiling process can actually improve performance and prevent any potential issues.

When we need to reference a TypeScript package and want it to be compiled to JavaScript, including node_modules is necessary to ensure everything functions properly, right?

Indeed, the key point here is timing. Even if `node_modules` is excluded during transpilation, webpack can still utilize its contents during the bundling stage.

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