Is there a way to eliminate the line that appears during TypeScript compilation of a RequireJS module which reads: Object.defineProperty(exports, "__esModule", { value: true });?

Here is the structure of my tsconfig.json file:

{
    "compileOnSave": true,
    "compilerOptions": {
        "module": "amd",
        "noImplicitAny": false,
        "removeComments": false,
        "preserveConstEnums": true,
        "strictNullChecks": true,
        "sourceMap": false
    }
}

In my project, I have a TypeScript file named a.ts which serves as an AMD module (using requirejs) and the code inside looks like this:

export function a() {
    var a = {
        b: 5
    };
    return a;
}

After compiling, the generated JavaScript files appear as follows:

 define(["require", "exports"], function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    function a() {
        var a = {
            b: 5
        };
        return a;
    }
    exports.a = a;
 });

The desired output for my JavaScript file should be:

define(function () {
    "use strict";
    var a = {
        b: 5
    };
    return a;
});

To achieve this, certain modifications need to be made:
a) Remove the line Object.defineProperty(exports, "__esModule", { value: true });
b) Eliminate the require and exports dependencies from define
c) Instead of having an internal function "a" that is then exposed on exports, simply return the "a" object directly in the a.js file

I am seeking advice on what changes are required in both tsconfig.json and a.ts files to attain closer to the desired JavaScript file. Any improvements or suggestions related to meeting one or more out of three requirements are welcomed. One approach could involve aligning a.ts exactly with the structure of the desired a.js file before compilation, albeit maintaining the export statement for creating an AMD module as mandated by a separate requirement. Thank you for your attention. Your assistance is highly appreciated.

Answer №1

To address your export problem, simply utilize the export = syntax in your module code like this:

var x = {
  y: 10
};

export = x;

When transpiled, it will look like this:

define(["require", "exports"], function (require, exports) {
    "use strict";
    var x = {
        y: 10
    };
    return x;
});

Keep in mind that using this syntax means you won't have the __esModule property.

The rest of your query is a duplicate of another post on Stack Overflow. In short, the TypeScript compiler does not offer a way to exclude the require and exports dependencies in the emitted code. If you wish to eliminate them, you'll need to handle that manually.

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