Leveraging TypeScript modules without the need for require()

Question

Leveraging TypeScript modules without the need for require()

I created a TypeScript 2.3 app called app.ts that requires the Vue.js library version 2. I manually added the Vue.js script src in the HTML file. All I wanted was to use Vue.js with type checking. I thought I could simply reference it like this:

/// < reference path="vue.d.ts" />

However, the Vue class was not accessible from app.ts. I attempted to import the module directly:

import * as Vue from "./vue";

This time, I had to use new Vue.Vue({}) to access the class but VS 2017 build. The app.js generated started with var Vue = require("./vue");. Unfortunately, when I viewed it in the browser, I encountered some errors:

exports reference (resolved by adding export = 0; at line 1 in .ts
require is not a function

To address the require(), I included < script src="Scripts/require.js">< /script> but then encountered a new error: has not been loaded yet for context.

Upon trying system.js instead of require.js, I added < script>System.import('scripts/app.js');< /script> which resulted in a 404 error when trying to access "Scripts/vue" (the require from the app.js), causing the rest of the app.js to not execute.

It's important to note that I am not using tsconfig.json.

I'm surprised because in my memory, the reference of jQuery worked with TypeScript 0.9.

I'm completely bewildered. Can someone please assist me? Thank you, community!

javascript typescript requirejs vue.js

Answer 1

Answer №1

To address the issue you encountered, I usually solve it by creating a file called globals.d.ts. This file is responsible for setting up the global environment that my code needs. For example:

import * as _Vue from "vue";

declare global {
    const Vue: typeof _Vue;
}

By doing this, the compiler will recognize the Vue symbol in the global scope, which matches the type exported by the "vue" module.

After creating the above file, the following code will compile successfully:

const q = new Vue();

Keep in mind that you will need to either use a tsconfig.json file. Even an empty one will suffice. (An "empty" tsconfig.json file contains only an empty JSON structure: {}.) Alternatively, you can specify all files to compile, including globals.d.ts, in the command line.

Answer 2

To address the issue you encountered, I usually solve it by creating a file called globals.d.ts. This file is responsible for setting up the global environment that my code needs. For example:

import * as _Vue from "vue";

declare global {
    const Vue: typeof _Vue;
}

By doing this, the compiler will recognize the Vue symbol in the global scope, which matches the type exported by the "vue" module.

After creating the above file, the following code will compile successfully:

const q = new Vue();

Keep in mind that you will need to either use a tsconfig.json file. Even an empty one will suffice. (An "empty" tsconfig.json file contains only an empty JSON structure: {}.) Alternatively, you can specify all files to compile, including globals.d.ts, in the command line.

Leveraging TypeScript modules without the need for require()

Answer №1

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