Angular: proper dependency injection may not occur when appending .js or .ts at the end of an import statement

When it comes to import statements, the format is usually as follows:

import {HelpService} from '../../help.service'

It's worth noting that if I utilize autowiring to inject HelpService into the constructor, an already existing instance of HelpService is returned. However, if the import statement looks like this:

import {HelpService} from '../../help.service.js'

The result changes, and a fresh new instance of the service is received instead of the previous one. The question now arises: why does this switch in behavior occur?

Answer №1

One of the amazing features of Typescript is highlighted here.

This capability eliminates the necessity for developers to explicitly define file types, as Typescript ultimately compiles into Javascript, enabling developers to reference modules using various extensions like .ts, .tsx, .js, and more.

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