'Unable to locate the identifier "system" in Angular 2' - troubleshoot this unique error

My routes file contains a reference to 'system' which is causing an error in my Visual Studio Code. The error states that it cannot find the name 'system'. I have attached a screenshot for reference: https://i.sstatic.net/W2oD2.png

Answer №1

The reason for this issue is that Typescript is not aware of the System object.

To resolve this, you need to install the typings for SystemJS.

npm install @types/systemjs --save-dev

Then, add a reference to the typings in your tsconfig.json, under the types section.

tsconfig.json

"typeRoots": ["node_modules"]
"types": ["system"]

If you plan to run this code in the browser, make sure to link the SystemJS script in your app for System.import() to work:

index.html

<script src="node_modules/systemjs/dist/system.src.js"></script>

Note:

To optimize performance of your app, you may want to implement lazy-loading (loading only necessary modules). The way you're currently loading modules using System.import() might not be suitable for lazy loading: Here is the recommended approach

Consider replacing:

path: 'inbox', loadChildren: ()=> System.import('../inbox/inbox.module')

With:

path: 'inbox', loadChildren: 'absolute/path/to/inbox/inbox.module#InboxModule'

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