```
declare module '*?raw' { const rawFileContent: string export default rawFileContent }
```
Then, when I add the file to my types property array of my tsconfig's compilerOptions, I can import anything I want into a typescript file as a string, so long as I add "?raw" to the end of it. I use it to inject HTML and CSS into templates. No reason it couldn't be used to inject a .proto file's contents into the inline template.
Again, you're technically correct! But a "import non js content" feature is a pretty solveable problem in TS. Maybe not at the language level, but at the implementation level, at least.