"Exploring the world of TypeScript Classes in combination with Webpack

If I create a TypeScript class with 10 methods and export a new instance of the class as default in one file, then import this class into another file (e.g. a React functional component) and use only one method from the class, how will it affect optimization? Can Webpack/Babel extract just the necessary code or will it include the entire class, resulting in unused code?

Would it be more efficient to avoid using classes and instead export each function individually?

My objective is to reduce exported bundle size and minimize Lighthouse warnings about unused JavaScript.

javascripttypescriptwebpackbabeljsweb-vitals

Answer №1

Many tools for tree shaking, including Webpack, operate by analyzing the tree structure of ES6 imports and exports to eliminate unused exports.

Consider the following example:

export class {
    myfunc1() { /* do stuff */ }
    myfunc2() { /* do stuff */ }
}

When using Webpack for tree shaking, if myFunc2 is being used, myFunc1 cannot be eliminated even if it's not used.

However, in this scenario, either function can be removed if unused:

export myFunc1 = () => { /* Do stuff */}
export myFunc2 = () => { /* Do stuff */}

In this situation, it is more beneficial for tree shaking (with Webpack) to group functions together in a file rather than using a class.

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