Currently, I'm in the process of developing an application utilizing Angular 2 and TypeScript. My goal is to incorporate a JavaScript method, specifically 'filter' for arrays, that is compatible with IE 11+, Chrome 45+, and other similar browsers. I am curious about the compatibility of my code with older browser versions. Since TypeScript transpiles to vanilla JavaScript, I am unsure how it handles ES6 features.
One of the benefits of TypeScript is its ability to leverage new features from ES6 and convert them to ES5; however, it does not automatically provide polyfills for built-in functions that are exclusive to ES6 and not available in ES5.
If you are utilizing these ES6-specific functions while targeting an ES5 environment, you will need to incorporate the necessary polyfills to ensure compatibility.
Case in point
Take the fill function which is newly introduced in ES6 as a method on the prototype of Array.
const result = ["first", "second"].fill("all");
This code will run smoothly when compiling for ES6 because TypeScript assumes the presence of the fill function in ES6 environments by including lib.es6.d.ts.
However, when targeting ES5, TypeScript will raise an error indicating the absence of the fill function:
error TS2399: Property 'fill' does not exist on type 'string[]'.
To rectify this issue, you must manually extend the Array<T> interface with the definition for fill in your project:
interface Array<T> {
fill(value: T, start?: number, end?: number): this;
}
Additionally, you should include a polyfill or utilize tools that automate this process.
Absolutely, it is possible to make it work by configuring tsconfig.json to target ES5
You can achieve this by adding target: "ES5" in the tsconfig.json compiler options or using --target ES5 for CLI
Regarding built-in features of ES6, I am not sure, but an effective solution would be to include babel-loader in webpack, grunt, gulp, etc, to automatically polyfill those features.
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