8000 type guards don't work over property accessors (projection operator `.`) · Issue #4297 · microsoft/TypeScript · GitHub
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type guards don't work over property accessors (projection operator .) #4297
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type guards don't work over property accessors (projection operator .)#4297
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opened on Aug 13, 2015
var data : { value: string | number } = { value: 'hey' };
if (typeof data.value === 'string') {
    alert(data.value.toLowerCase());  // <-- type of value is undecided 
}

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