Different import paths for same module resolve it to two different modules

[nsine]

Hey there 👋

TLDR;

I have created a small project to show the issue: https://github.com/nsine/tsconfig-paths-bug-example 🙂

Description:

• We have configured custom-resolved paths ~/* -> ~/src in tsconfig.json
• In file errors/classes.ts we define custom error class AppError which extends Error
• And we throw it in moreCode/code.ts file in function runCode
• errors/errorHanlder runs this function in try/catch and here is the issue:

If i'm trying to check if err instanceof AppError - i will get false, however i used this class when throwing. After that i initialize the Error line after and it has correct constructor and therefore instanceof works there.

Looking at produced compiled js I see that file errorHandler.js imports var classes_1 = require("./classes"); however code.ts has another import path var classes_1 = require("~/errors/classes"); (I expect it's correct behavior). But looking at this instanceof example I assume that these two imports resolve module classes.ts twice as two different modules which is incorrect 👯‍♂️

Will appreaciate any ideas how to fix that!