Does anyone know how to restrict importing `.js` extensions on `.ts` files? I need some kind of ESLint plugin/TS rule for this so that Node's TS runner doesn't crash at runtime - ThreadSky

crutchcorn.dev • 38 days ago

Does anyone know how to restrict importing `.js` extensions on `.ts` files?

I need some kind of ESLint plugin/TS rule for this so that Node's TS runner doesn't crash at runtime

Comments

lancejeffers.bsky.social•38 days ago

Don't have an answer, but why does this crash the TS runner? Isn't importing a JS file into a TS file syntactically valid?

crutchcorn.dev•38 days ago

In TS yes, but Node's --experimental-strip-types flag requires you to use `.ts` as `.js` isn't seen by Node

kcrwfrd.bsky.social•38 days ago

If using vscode you could try

"typescript.preferences.importModuleSpecifierEnding": "ts"

crutchcorn.dev•38 days ago

@webstorm.jetbrains.com , got anything similar? 👀

kcrwfrd.bsky.social•38 days ago

tsconfig.json has an `allowJs: true|false` setting, does that help?

crutchcorn.dev•38 days ago

Alas no; that setting is only for enabling JS files to be imported. Because the source files are `.ts` they allow resolution either way

kcrwfrd.bsky.social•38 days ago

🤔 I’m confused what you’re trying to do then.

Do you mean that you have a foo.ts file but you have `import foo from 'foo.js'`?

crutchcorn.dev•38 days ago

TypeScript's Node settings (for modules) support importing `.ts` files with a `.js` extension as a result of much older Node TS interop stories.

As a result, my IDE consistently tries to import `.ts` files as `.js` extensions, but Node's new --strip-t runtime crashes when it can't find the JS file

crutchcorn.dev•38 days ago

So I want to tell TypeScript's LSP "that file does not exist, do not allow it to be imported" minimally and "don't ever auto-import it" maximally

kcrwfrd.bsky.social•38 days ago

Tbh sounds like a problem with your IDE but maybe one of these will help:

https://www.typescriptlang.org/tsconfig/#allowImportingTsExtensions

https://github.com/import-js/eslint-plugin-import/blob/main/docs/rules/extensions.md

I would be inclined to try configuring lint rules to enforce imports without file extensions.

Comments

Posting Rules

Reply