Understanding how to use TypeScript modules with system exports in the browser using systemjs

Question

Understanding how to use TypeScript modules with system exports in the browser using systemjs

I’m facing an issue while using systemjs. I compiled this code with tsc and exported it: https://github.com/quantumjs/solar-popup/blob/master/package.json#L10

{
  "compilerOptions": {
    "module": "system",
    "target": "es5",
    "sourceMap": true,
    "outFile":"./build/solar-popup.js",
    "sourceRoot": "./src/SolarPopup.ts",
    "rootDir": "./src/"

  },
  "exclude": [
    "node_modules"
  ]
}

When trying to use it in the browser, the imported object does not have any exports. I believe this is because solar-popup.js only has System.register calls without any exports.

This is how the export looks:

System.register("SolarPopup", ["ModalBackground", "constants"], function (exports_4, context_4) {
    "use strict";
    var __moduleName = context_4 && context_4.id;
    var ModalBackground_1, constants_2, SolarPopup;
    return {
        setters: [
            function (ModalBackground_1_1) {
                ModalBackground_1 = ModalBackground_1_1;
            },
            function (constants_2_1) {
                constants_2 = constants_2_1;

etc

typescript systemjs

Answer 1

Answer №1

If you are faced with the dilemma of choosing between two options in your tsconfig.json file:

"module": "system",
"outFile":"./build/solar-popup.js",

Then TypeScript will generate a single output file that includes multiple System.register calls, each registering a module under its own name:

 System.register("SolarPopup", ["ModalBackground", "constants"], function ...

The term "SolarPopup" represents a module name in this context. SystemJS interprets such a file as a bundle rather than an individual module.

When importing a bundle, the result is an empty object and all modules within it are registered and immediately accessible without needing to be fetched.

To access a specific module from the bundle, you will need to make an additional import. Here's how you can do it:

System.import('../build/solar-popup.js').then(function() {
    System.import('SolarPopup').then(function(SolarPopup) {
        console.dir(SolarPopup);
    });
});

Answer 2

If you are faced with the dilemma of choosing between two options in your tsconfig.json file:

"module": "system",
"outFile":"./build/solar-popup.js",

Then TypeScript will generate a single output file that includes multiple System.register calls, each registering a module under its own name:

 System.register("SolarPopup", ["ModalBackground", "constants"], function ...

The term "SolarPopup" represents a module name in this context. SystemJS interprets such a file as a bundle rather than an individual module.

When importing a bundle, the result is an empty object and all modules within it are registered and immediately accessible without needing to be fetched.

To access a specific module from the bundle, you will need to make an additional import. Here's how you can do it:

System.import('../build/solar-popup.js').then(function() {
    System.import('SolarPopup').then(function(SolarPopup) {
        console.dir(SolarPopup);
    });
});

Understanding how to use TypeScript modules with system exports in the browser using systemjs

Answer №1

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