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type guards don't work over property accessors (projection operator .) #4297

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zpdDG4gta8XKpMCd opened this issue Aug 13, 2015 · 2 comments
Closed

type guards don't work over property accessors (projection operator .) #4297

zpdDG4gta8XKpMCd opened this issue Aug 13, 2015 · 2 comments
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@zpdDG4gta8XKpMCd
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var data : { value: string | number } = { value: 'hey' };
if (typeof data.value === 'string') {
    alert(data.value.toLowerCase());  // <-- type of value is undecided 
}
@danquirk
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You might also want to look at #1260

@zpdDG4gta8XKpMCd
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thanks, mine is clearly a dup

@danquirk danquirk added the Duplicate An existing issue was already created label Aug 13, 2015
@mhegazy mhegazy mentioned this issue Nov 4, 2015
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@zpdDG4gta8XKpMCd @danquirk