The shift from es6 to commonJs in Angular modules has far-reaching implications

My attempt to incorporate FileSaver into my app led me to use the following command:

import filesaver = require('filesaver');

However, this resulted in the error message:

Import assignment cannot be used when targeting ECMAScript 2015 modules

To resolve this issue, I modified the module setting in tsconfig.json from es6 to commonjs.

While this solution resolved the problem, I can't help but wonder about the consequences of changing from es6 to commonjs. There must have been a reason for using es6 initially, right?

Is there a way to achieve the desired functionality without making this change?

Answer №1

A great approach when working with TypeScript is to utilize es6/TypeScript module loading syntax:

import { type } from './module';

After compiling your TypeScript code into JavaScript, you have the flexibility to choose any module loader that fits your needs:

es6
system
commonjs
AMD
UMD

To specify the target module system, adjust the settings in tsconfig.json:

"compilerOptions": {
  ...
  "module": "commonjs",
}

Although current browsers do not support native module loading, you can include the necessary script based on your chosen module system.

For instance, if you opt for "system" or "commonjs", ensure that you include a compatible script for proper module loading (e.g. node_modules/systemjs/dist/system.js)

Personal Recommendation for TypeScript Angular2 Development

In my opinion, using es6 for module loading syntax offers a clear and concise approach. I find it beneficial to develop Angular2 applications in TypeScript while leveraging es6 language features, especially the streamlined module loading syntax. When transpiling TypeScript to JavaScript, targeting es5 works well since most modern browsers provide sufficient compatibility without requiring a shim. Additionally, utilizing systemjs as the module loader grants flexibility for potential format changes in the future.

When coding in TypeScript for FileServer functionality, sticking with es6 module loading syntax ensures consistency with the targeted module loader across all your TypeScript files.

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