Compile TypeScript to multiple targets

Question

I want to compile Typescript files to multiple targets like to ES5 and ES6 both. I have the following example directory:

ES5

ES6

test.ts

tsconfig.json

So when I run the compiler I want it to compile test.ts as ES5 to the ES5 folder and as ES6 to the ES6 folder. Is that possible somehow?

Answer 1

A simple solution would be to create two tsconfig.json files with the different targets and output directories.

tsconfig-es5.json

{
  "compilerOptions": {
    "target": "ES5",
    "outDir": "./ES5",
    // Additional configuration like module type etc.
}

tsconfig-es6.json

{
  "compilerOptions": {
    "target": "ES6",
    "outDir": "./ES6",
    // Additional configuration like module type etc.
}

Then create a build script that concatenates the building, e.g. for Windows:

tsc --project ./tsconfig-es5.json && tsc --project ./tsconfig-es6.json

The alternative would be to have one tsconfig.json and directly specify the target and outDir parameters in the build script (see Compiler Options).