keepup-ECMAScript
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  • About
  • Proposal
    • using
    • Temporal
  • ES2025
    • Promise.try
    • Sync Iterator helpers
    • Import Attributes
    • JSON Modules
    • New Set Methods
    • RegExp Modifiers
    • Duplicate named capture groups
  • ES2024
    • Resizable and growable ArrayBuffers
    • RegExp v flag with set notation + properties of strings
    • Atomics.waitAsync
    • Well-Formed Unicode Strings
    • array grouping
    • Promise withResolvers
  • ES2023
    • Symbols as WeakMap key
    • Hashbang Grammar
    • Array.findLast, findLastIndex
    • 配列の非破壊操作
  • ES2022
    • Private class fields
    • Regexp match indices
    • Top-level await
    • Private fields in-in
    • Array.at
    • Object.hasOwn
    • Class static block
    • Error cause
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  1. ES2022

Top-level await

関数宣言や関数式の外(モジュールのトップレベル)でasyncなしのawaitが使えるようになった。

Example

<script type="module">
  const result = await fetch("https://...");
</script>

Link

LogoGitHub - tc39/proposal-top-level-await: top-level `await` proposal for ECMAScript (stage 4)GitHub
LogoJavaScript operator: await: Use at module top level | Can I use... Support tables for HTML5, CSS3, etc
Logoawait - JavaScript | MDN
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最終更新 2 年前