Fixing the "Please add a @Pipe/@Directive/@Component annotation" Error In An Angular App After Upgrading to webpack 4

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I'm currently in the process of upgrading an Angular application which does not use the Angular CLI from webpack 2 to webpack 4. The incremental upgrade from webpack 2 to 3 was easy, but once I made the jump from 3 to 4, I encountered a lot of problems. I went through them one by one, but the one that had me stumped was the following:

Unhandled Promise rejection: Unexpected value 'MakePositivePipe' declared by the module 'SharedModule'. Please add a @Pipe/@Directive/@Component annotation. ; Zone: <root> ; Task: null ; Value: Error: Unexpected value 'MakePositivePipe' declared by the module 'SharedModule'. Please add a @Pipe/@Directive/@Component annotation.

The code was transpiling/compiling fine, but this error was occurring when I'd navigate to a page containing this pipe. This code has worked fine under webpack 2 and 3. I made sure that the pipe was being set up as a declaration, which it was. What finally corrected the issue for me was this: the developer(s) who had created this pipe had also created several more all within the same file, and once I split them apart into separate files, the issue was resolved.

On one hand, I find it concerning that this code compiled fine under the earlier versions of webpack. On the other hand, I think it's a bad practice to declare multiple pipes, components, or services within the same file. Regardless, at the end of the day, regression testing will be especially important for this upgrade.

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