Angular2 and TypeScript bug "The property METHOD_NAME is not found on the type 'typeof CLASS_NAME'"

Seeking assistance with Angular2 and TypeScript as I transition from A1 to A2. Currently, I am facing a situation that may seem obvious for experienced developers:

Here's the scenario:

  1. Utilizing Webpack.
  2. AppConfigConst contains static, app-wide configuration data.
  3. AppConfigurationInjectable utilizes AppConfigConst to provide an accessible API for configuration data.
  4. SelectedLanguageInjectable is attempting to use a method from AppConfigConst, resulting in this error:

ERROR in [default] C:_DEV\XXX\src\app\shared\selected-language\selected-language.injectable.ts:9:46 Property 'getSupportedUiLanguages' does not exist on type 'typeof AppConfigurationInjectable'.

https://i.sstatic.net/rGsV1.png

angulartypescriptwebpack

Answer №1

There is an error in your constructor that needs to be corrected:

constructor(private appConfiguration: AppConfigurationInjectable){

Please replace = with :

In TypeScript, : is used for defining types while = is used for assigning values.

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