Tailor TypeScript to support various JavaScript versions

One of the advantages of TypeScript is the ability to target different versions of Javascript globally - allowing for seamless switching between transpiling ES3, ES5, or ES6.

For browsers like IE that require ES3 support, it serves as the lowest common denominator.

On the other hand, modern browsers such as Chrome are already equipped to handle ES6 and can run the smaller ES6 code more efficiently with optimizations.

With this in mind, the goal is to serve ES3 to IE and ES6 to Chrome from the same TypeScript source code.

  • Is there a method to have TypeScript transpile into multiple JS files, identified as perhaps *.es3 and *.es6, to allow for choosing which version to serve? (Preferably within VS 2015)

  • Alternatively, can the TypeScript transpiler be accessed in C# to handle the process at runtime?

visual-studiotypescriptecmascript-6ecmascript-5ecmascript-3

Answer №1

If you want to transpile to a specific version, you can do so by utilizing the command line option --target ES3.

In addition, you have the ability to define an output directory to generate both ES6 and ES3 transpiled code. This way, you can easily select which version to reference on demand, using techniques like old style IE ifs.

Answer №2

Have you considered utilizing a variety of tsconfig.json configurations?

For instance, something along the lines of:

 - project-root  
    - ts-source  
    - js-es3  
       - tsconfig.json  
       - js  
    - js-es5  
       - tsconfig.json  
       - js

Then, within 

project-root/js-es3/tsconfig.json
:

{
    "compilerOptions": {
        "target": "ES3",
        "outDir": "js",
        "rootDir": "../ts-srouce"
    }
}

And within 

project-root/js-es5/tsconfig.json
:

{
    "compilerOptions": {
        "target": "ES5",
        "outDir": "js",
        "rootDir": "../ts-srouce"
    }
}

I may not be familiar with visual studio, but you could still compile it with different tsconfig.json files or use tsc for compilation.

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