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.

https://i.sstatic.net/z8UEW.png

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

typescriptsystemjs

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);
    });
});

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