Microsoft/TypeScript
Regression: incorrect return type when disabled strictNullChecks
Aberta
#60.187 aberto em 10 de out. de 2024
Domain: check: Type InferenceHelp WantedPossible Improvement
Métricas do repositório
- Stars
- (108.860 estrelas)
- Métricas de merge de PR
- (Métricas PR pendentes)
Description
🔎 Search Terms
"ts7011", "strictnullchecks"
🕗 Version & Regression Information
- This changed between versions 5.6.3 and 5.7.0-beta (also in 5.7.0-dev.20241010)
When disabled strictNullChecks in tsconfig.json error TS7011: Function expression, which lacks return-type annotation, implicitly has an T return type
⏯ Playground Link
💻 Code
declare function wildcardToRegExp(s: string): RegExp | null;
const rules = ['a', 'b'].flatMap(rule => wildcardToRegExp(rule) || []); // if flatMap<RegExp> - no error
🙁 Actual behavior
TS7011: Function expression, which lacks return-type annotation, implicitly has an 'RegExp | any[]' return type.
🙂 Expected behavior
No error
Additional information about the issue
No response