Typescript incorrectly infer the types for Readonly optional properties. #18902

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1. Sergei Dryganets (dryganets)

   changed the title [-]Typescript incorrectly infer the types for Readonly members.[/-] [+]Typescript incorrectly infer the types for Readonly optional properties.[/+] on Oct 3, 2017
2. mhegazy commented on Oct 3, 2017

   

   Mohamed Hegazy (mhegazy)

   on Oct 3, 2017

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   This is a duplicate of #15376. this.prop.a is a generic type, P["a"], and there is no way currently to narrow a generic type.

   It is worth noting that the compiler does the right thing on property access/ index access/ call thanks to #15576. but the type of the symbol does not change.
3. Mohamed Hegazy (mhegazy)

   added

   Design LimitationConstraints of the existing architecture prevent this from being fixedConstraints of the existing architecture prevent this from being fixed

   on Oct 3, 2017
4. mhegazy commented on Oct 17, 2017

   

   Mohamed Hegazy (mhegazy)

   on Oct 17, 2017

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   Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.
5. Mohamed Hegazy (mhegazy)

   closed this as completedon Oct 17, 2017
6. microsoft

   locked and limited conversation to collaborators on Jun 14, 2018