Incorporating a custom transpiled file format into Typescript imports

I am trying to import a file format .xyz that does not have fixed types for all instances of the format:

import { Comment, Article, User } from "./Blog.xyz"

However, I keep getting this error message:

TS2307: Cannot find module './Blog.xyz' or its corresponding type declarations.

Here is what I have tried so far:

  • I created a compiler to convert my file format to Typescript.
  • I added a Typescript plugin to enable IDE support for my files, allowing me to autocomplete types and constants. This was achieved by including a ScriptSnapshot when importing my files relative to the project.
  • I thought I needed a webpack loader to assist in filling the gap during the transpilation process from Typescript to Javascript, but it did not solve the issue.
  • Then, I came across this link (How to import custom file types in Typescript) which explains how to add a declaration file to the type roots of the tsconfig.json. However, this method is not feasible for me as my files have unique custom types for each instance.
  • I also explored the option of adding custom file extensions to require.extensions, but this did not resolve the problem either. What am I missing to make the Typescript build or the webpack build function properly? What is the key component needed to prevent the aforementioned error message?

Answer №1

After realizing there were multiple errors in my approach, I found a solution for the missing types of Blog.xyz. By simply adding a .d.ts file that corresponds to the file extension, the error disappeared. However, the values for this file still remained missing.

To address the issue with the values, I attempted to implement a custom webpack loader. Unfortunately, several obstacles hindered my progress:

  1. I overlooked a comma missing within a list while ensuring the transpiled code was error-free.
  2. I discovered that the import needed to be on a value instead of a type in order to trigger the inclusion of the transpiled file (although this may not be the only factor).
  3. I encountered challenges with the next loader, ts-loader, as its options required the transpileOnly flag to be included.

Clearer error messages at various stages would have greatly facilitated troubleshooting in this process.

If you find yourself debugging your custom loader, I suggest using the inspect-loader along with the --stats option provided by webpack.

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