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JSON.stringify(undefined) is not a string, but Typescript only defines the return type of string #40296

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huboshu0819 opened this issue Aug 28, 2020 · 2 comments
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JSON.stringify(undefined) is not a string, but Typescript only defines the return type of string #40296

huboshu0819 opened this issue Aug 28, 2020 · 2 comments
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huboshu0819 commented Aug 28, 2020 •
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TypeScript Version: 3.7.5

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Code

JSON.stringify(undefined).replace(/aa/ig, '');

**Expected behavior: typescript should prompt a type error

**Actual behavior: No error message

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@huboshu0819 huboshu0819 changed the title JSON.stringify(undefined) is not a string JSON.stringify(undefined) is not a string, but Typescript only defines the return type of string Aug 28, 2020
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

@RyanCavanaugh RyanCavanaugh added the Duplicate An existing issue was already created label Aug 28, 2020
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Duplicate #18879

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