TypeScript error when importing TypeScript #48504
Description
Bug Report
🔎 Search Terms
LanguageServiceHost useCaseSensitiveFileNames
🕗 Version & Regression Information
- This changed between versions 4.7.0-dev.20220311 and 4.7.0-dev.20220312
⏯ Playground Link
N/A, requires import statement which isn't possible in the playground
💻 Code
import * as ts from 'typescript';Yep, that's it.
🙁 Actual behavior
The following error is generated:
node_modules/typescript/lib/typescript.d.ts:5716:15 - error TS2430: Interface 'LanguageServiceHost' incorrectly extends interface 'MinimalResolutionCacheHost'. Types of property 'useCaseSensitiveFileNames' are incompatible.
Type '(() => boolean) | undefined' is not assignable to type 'boolean | (() => boolean)'.
Type 'undefined' is not assignable to type 'boolean | (() => boolean)'.
5716 interface LanguageServiceHost extends GetEffectiveTypeRootsHost, MinimalResolutionCacheHost {
~~~~~~~~~~~~~~~~~~~
Found 1 error in node_modules/typescript/lib/typescript.d.ts:5716
🙂 Expected behavior
TypeScript should compile without errors.