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Add support for in narrowing #37858

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Kingwl wants to merge 3 commits into microsoft:master from Kingwl:in-narrow

Contributor

Kingwl commented Apr 9, 2020 •

edited

Fixes #21732

This or add existed key narrowing by in operator according #31132 by Generate an intersection with { a: unknown }.

wip

ba521ce

Contributor Author

Kingwl commented Apr 9, 2020

Some problems:

Should we narrow it if distribution failed?
If so, should we narrow it if any member of the union is undefined/null/number?

Kingwl added 2 commits

April 9, 2020 18:06


          fix more case

487dff7


          accept baseline

879f69e

Kingwl force-pushed the in-narrow branch from 399ad72 to 879f69e Compare

April 9, 2020 10:19

Kingwl closed this

typescript-bot added the For Backlog Bug label

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