First look: adding type annotations to JavaScript

Update 2022-03-10: I’m quoting a few insightful tweets at the end of this blog post. The ECMAScript proposal “Types as comments” (by Gil Tayar, Daniel Rosenwasser, Romulo Cintra, Rob Palmer, and others) is about adding type annotations to JavaScript (there is also an accompanying blog post). Such type annotations would look similar to TypeScript’s and Flow’s annotations and are completely ignored

[ABA]

Types as commentsの提案についての所感。あまりにたくさんのシンタックスがJavaScriptに加わるので、既存のJavaScript用ツール群をアップグレードするのが大変そうというのは確かにそうかも