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    collappsar (collappsar@fediverse-lite.com)'s status on Friday, 11-Nov-2022 06:46:24 JSTcollappsarcollappsar

    https://github.com/microsoft/TypeScript/pull/50666 The next version of TypeScript will have a very useful feature. Now you can check typeof obj === "object" && obj !== null && 'foo' in obj && typeof obj.foo === "string" and TS will know that obj.foo is a string and let you work with it even when the type of obj is unknown.

    In conversationFriday, 11-Nov-2022 06:46:24 JST from fediverse-lite.compermalink

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      Improve checking of `in` operator by ahejlsberg · Pull Request #50666 · microsoft/TypeScript
      This PR improves checking of the in operator: In the expression key in obj, we now require the type of key to be assignable to string | number | symbol. Previously we allowed key to be of an uncon...
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