make the strict equality comparison operator a typeguard for string literal types · Issue #7447 · microsoft/TypeScript (original) (raw)

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Description

1.9.0-dev.20160217

Code

const hey: 'hey' = 'hey'; const value = Math.random() > 0.5 ? 'hey' : 'nay'; if (value === hey) { // here expected value to be of type 'hey' (we just asserted it), actual string }

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