More actionable "must have annotation" message #35839
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sandersn
approved these changes
Jan 8, 2020
| ~~~~~~ | ||
| !!! error TS2775: Assertions require every name in the call target to be declared with an explicit type annotation. | ||
| !!! related TS2728 tests/cases/conformance/controlFlow/assertionTypePredicates1.ts:144:11: 'assert' is declared here. | ||
| !!! related TS2782 tests/cases/conformance/controlFlow/assertionTypePredicates1.ts:144:11: 'assert' needs an explicit type annotation. |
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as far as I understand, this error was previously incorrect and is now still incorrect. the real problem is that we can't use asserts with arrow functions, right?
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No, the arrow function is fully annotated, but the assert declaration itself needs to be annotated. It's very stupid.
- const assert = (value: unknown): asserts value => { }
+ const assert: (value: unknown) => asserts value = (value: unknown): asserts value => { }
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Or "better"
- const assert = (value: unknown): asserts value => { }
+ const assert: (value: unknown) => asserts value = value => { }
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Fixes #35838