Troubleshooting TypeScript compatibility with SystemJS when encountering problems with the .js extension

Question

Troubleshooting TypeScript compatibility with SystemJS when encountering problems with the .js extension

Initializing my TypeScript file with the import statement below. It's important to note that the lack of a .ts extension indicates that I am importing a TypeScript module:

import githubService from './github.service';

Through transpilation, the import statement becomes:

var github_service_1 = require('./github.service');

However, when SystemJS attempts to load this module, it makes an HTTP request of the form:

GET /github.service

instead of GET /github.service.js. This approach clearly does not yield the desired outcome.

How can I configure TypeScript to function smoothly with SystemJS?

Below is the content of my tsconfig.json file:

{
    "compilerOptions": {
        "target": "es5",
        "module": "commonjs",
        "outDir": "./dist",
        "declaration": false,
        "noImplicitAny": false,
        "removeComments": true,
        "noLib": false,
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "sourceMap": true
    },
    "exclude": [
        "node_modules"
    ],
    "compileOnSave": false
}

I also attempted to switch the module setting to system (transitioning from CommonJS to SystemJS as the module format), yet the issue persisted.

typescript systemjs typescript1.7

Answer 1

Answer №1

It appears that the issue at hand may be the absence of js extensions in the module names. Recently, System.js made changes that require specifying '.js' explicitly in order to resolve them. To address this, you can configure System.js options in your index.html as follows:

System.defaultJSExtensions = true;

For more detailed information, please refer to: defaultJSExtensions

UPDATE

Upon further clarification from @Naresh, it seems that defaultJSExtensions is now outdated. The preferred approach appears to be utilizing the packages option in the configuration instead.

I hope this explanation proves helpful.

Answer 2

It appears that the issue at hand may be the absence of js extensions in the module names. Recently, System.js made changes that require specifying '.js' explicitly in order to resolve them. To address this, you can configure System.js options in your index.html as follows:

System.defaultJSExtensions = true;

For more detailed information, please refer to: defaultJSExtensions

UPDATE

Upon further clarification from @Naresh, it seems that defaultJSExtensions is now outdated. The preferred approach appears to be utilizing the packages option in the configuration instead.

I hope this explanation proves helpful.

Answer 3

Answer №2

Enhance your System 2.0+ experience with the power of Loader Hooks for customization

Check out this link for more information: https://github.com/systemjs/systemjs/blob/2.0.0/docs/hooks.md#loader-hooks

One example of using Loader Hooks is adding the .js file extension to modules during resolution by overriding the System.prototype.resolve function:

const origResolve = System.constructor.prototype.resolve

System.constructor.prototype.resolve = function(moduleId, ...args) {
  return origResolve.call(
    this, 
    moduleId + '.js', // adding .js extension to original module id
    ...args
  )
}

Keep in mind that the provided code is a basic illustration and may not be suitable for all scenarios, but it demonstrates how you can customize your configuration.

Answer 4

Enhance your System 2.0+ experience with the power of Loader Hooks for customization

Check out this link for more information: https://github.com/systemjs/systemjs/blob/2.0.0/docs/hooks.md#loader-hooks

One example of using Loader Hooks is adding the .js file extension to modules during resolution by overriding the System.prototype.resolve function:

const origResolve = System.constructor.prototype.resolve

System.constructor.prototype.resolve = function(moduleId, ...args) {
  return origResolve.call(
    this, 
    moduleId + '.js', // adding .js extension to original module id
    ...args
  )
}

Keep in mind that the provided code is a basic illustration and may not be suitable for all scenarios, but it demonstrates how you can customize your configuration.

Answer 5

Answer №3

Within your tsconfig file:

"module": "commonjs",

Considering you're utilizing systemjs, update your module format to system.

Answer 6

Within your tsconfig file:

"module": "commonjs",

Considering you're utilizing systemjs, update your module format to system.

Troubleshooting TypeScript compatibility with SystemJS when encountering problems with the .js extension

Answer №1

Answer №2

Answer №3

Similar questions

Automatically shift focus to the next input when reaching the maximum length in Angular

What is the correct method for retrieving a specific child element in React?

Ways to set a button as default clicked in an Array

What is the best way to identify errors in an express listen callback function?

Encountering difficulty obtaining return value from asynchronous function, await behaving inconsistently in Vue API Service

The API for GridOptions in Angular4's ag-Grid is not defined

Embedded template does not utilize property binding ngif with any directive

Tips for resolving the error of encountering a forbidden and unexpected token in JSON at position 0 while using React hooks

How should one properly assign an element type provided as an argument?

Express not functioning properly with custom error handler

When using the e.target.getAttribute() method in React, custom attributes may not be successfully retrieved

Stop users from switching to other tabs within mat-tab-group without using ViewChild

Utilizing a Firebase function with Angular

Tips for incorporating flow and TypeScript typings into an NPM module

Oops! An issue occurred during the `ng build` command, indicating a ReferenceError with the message "Buffer is not defined

What steps do I need to take to implement Dispatch in a React Native project?

The outcome of using Jest with seedrandom becomes uncertain if the source code undergoes changes, leading to test failures

I am unable to process the information and transform it into a straightforward list

After deploying on Vercel, Next.js' getServerSideProps function is returning undefined

Mastering Inter-Composable Communication in Vue 3: A Guide