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delete-only-optional-property: handle union types with non-optional property in one constituent #722

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ajafff opened this issue Dec 15, 2020 · 0 comments

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ajafff commented Dec 15, 2020

declare var union: {prop?: string} | Record<'prop' | 'other', string>;
delete union.prop; // expected error here

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Hande new language features between typescript 3.6 and 4.2 #717

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