Set up your Typescript project to transpile code from ES6 to ES5 by utilizing Bable

Embarking on a new project, I am eager to implement the Async and Await capabilities recently introduced for TypeScript.

Unfortunately, these features are currently only compatible with ES6.

Is there a way to configure Visual Studio (2015 Update 1) to convert the ES6 JavaScript output by TypeScript into ES5?

This would involve a process where TypeScript code is compiled to ES6 and then transpiled to ES5. This workaround would remain in place until TypeScript natively supports Async/Await targeting ES5.

Answer №1

Perhaps this isn't exactly what you were looking for, but it offers a way to achieve the same outcome. Hopefully, you find it helpful. To start, refer to the documentation here , which explains how to integrate gulp in VS2015. Next, ensure your tsconfig.json file includes TypeScript compiler options similar to the following:

//tsconfig.json

{
    "compilerOptions": {
        "target": "ES6",
        "experimentalDecorators": true,
        "emitDecoratorMetadata": true,
        "module": "commonjs",
        "noImplicitAny": false,
        "removeComments": true,
        "preserveConstEnums": true
    },
    "exclude": [
        ".vscode",
        "node_modules",
        "typings",
        "public"
    ]
}

Lastly, consider using a gulpfile like the one below - adapted from one of my own projects - to transpile ES6 to ES5:

// gulpfile.js

'use strict';

var gulp = require("gulp"),
    ts = require("gulp-typescript"),
    babel = require("gulp-babel");

var tsSrc = [
    '**/*.ts',
    '!./node_modules/**',
    '!./typings/**',
    '!./vscode/**',
    '!./public/**'
];
gulp.task("ts-babel", function () {
    var tsProject = ts.createProject('tsconfig.json');
    return gulp.src(tsSrc)
        .pipe(tsProject())
        .pipe(babel({
            presets: ['es2015'],
            plugins: [
                'transform-runtime'
            ]
        }))
        .pipe(gulp.dest((function (f) { return f.base; })));
});

You can now transpile files by running the command gulp ts-babel. Remember to install necessary npm packages like babel-preset-es2015 and babel-plugin-transform-runtime.

Update: Special thanks to Ashok M A for pointing out the correction needed. Changed pipe(ts()) to pipe(tsProject())

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