From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jimmy Yuen Ho Wong Newsgroups: gmane.emacs.bugs Subject: bug#63810: 29.0.91; typescript-ts-mode grammar missing the "is" keyword Date: Wed, 31 May 2023 08:30:14 +0100 Message-ID: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="8972"; mail-complaints-to="usenet@ciao.gmane.io" To: 63810@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed May 31 09:31:45 2023 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1q4GJ7-0002AN-4u for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 31 May 2023 09:31:45 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1q4GIq-0000oS-3o; 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C-x C-f test.ts 2. Insert ```typescript function isFish(pet: Fish | Bird): pet is Fish { return (pet as Fish).swim !== undefined; } ``` 3. Observe the `is` keyword isn't highlighted. Expectation: TypeScript has a concept called type predicates, which introduces a keyword called `is`. [Reference](https://www.typescriptlang.org/docs/handbook/2/narrowing.html#using-type-predicates)