Embed Notice

HTML Code

<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://fediverse-lite.com/objects/530a99a2-3208-4378-b54a-ef72682de4a0">collappsar (collappsar@fediverse-lite.com)'s status on Friday, 11-Nov-2022 06:46:24 JST</a><a href="https://fediverse-lite.com/users/collappsar" title="collappsar@fediverse-lite.com"><img src="https://gnusocial.jp/avatar/7068-48-20220824124639.webp" width="48" height="48" alt="collappsar" style="position: absolute; left: 0; top: 0;">collappsar</a></section><article><p><a href="https://github.com/microsoft/TypeScript/pull/50666">https://github.com/microsoft/TypeScript/pull/50666</a> The next version of TypeScript will have a very useful feature. Now you can check typeof obj === "object" &amp;&amp; obj !== null &amp;&amp; 'foo' in obj &amp;&amp; typeof <a href="http://obj.foo">obj.foo</a> === "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.</p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/394093#notice-666430">In conversation</a><time datetime="2022-11-11T06:46:24+09:00" title="Friday, 11-Nov-2022 06:46:24 JST">Friday, 11-Nov-2022 06:46:24 JST</time> <span>from <span><a href="https://fediverse-lite.com/objects/530a99a2-3208-4378-b54a-ef72682de4a0" rel="external" title="Sent from fediverse-lite.com via ActivityPub">fediverse-lite.com</a></span></span><a href="https://fediverse-lite.com/objects/530a99a2-3208-4378-b54a-ef72682de4a0">permalink</a><h4>Attachments</h4><ol><li><article><header><div>Domain not in remote thumbnail source whitelist: opengraph.githubassets.com</div><h5><a href="https://github.com/microsoft/TypeScript/pull/50666">Improve checking of `in` operator by ahejlsberg · Pull Request #50666 · microsoft/TypeScript</a></h5><div></div></header><div>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...</div><footer></footer></article></li></ol></footer></blockquote>

Corresponding Notice

Embed this notice
collappsar (collappsar@fediverse-lite.com)'s status on Friday, 11-Nov-2022 06:46:24 JST collappsar
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 conversation3 years ago from fediverse-lite.compermalink
Attachments
1. Domain not in remote thumbnail source whitelist: opengraph.githubassets.com
  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...

Public

Embed Notice

HTML Code

Corresponding Notice