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Modern JavaScript: semantics, async and compatibility v1.0.0

Use this resource to implement or debug JavaScript behavior against the declared runtime target

New

  • 476 downloads
  • 129 likes
  • 193 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install modern-javascript-semantics-compat

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent separates what the specification defines, what the runtime supports and what the toolchain handles, then checks the declared target (engines, browsers, build configuration) before using recent syntax. It draws on references per ECMAScript edition.

Mostly picked by

Updated November 2, 2026

Card for the “Modern JavaScript: semantics, async and compatibility” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

Similar resources

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What you get

  • references/PROMISES.md and CONCURRENCY.md: promises and concurrency
  • references/COMPATIBILITY.md: runtime compatibility
  • references/ES2024.md, ES2025.md and ES2026.md: features per edition

Good fit for

  • Promise or async behavior surprises you in your code
  • You want recent syntax without breaking an older environment

Not for

    Tags

    • JavaScript
    • ECMAScript
    • promises
    • async
    • compatibility

    About

    You say

    “This Promise.all misbehaves when one request fails: explain and fix it.”

    Card for the “Modern JavaScript: semantics, async and compatibility” skill

    Skill published by ccheney under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to implement or debug JavaScript behavior against the declared runtime target
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • references/CHEATSHEET.md14 KB
    • references/COMPATIBILITY.md10.6 KB
    • references/CONCURRENCY.md8.1 KB
    • references/ES2016-ES2017.md5.2 KB
    • references/ES2018-ES2019.md9.1 KB
    • references/ES2022-ES2023.md8.9 KB
    • references/ES2024.md7.8 KB
    • references/ES2025.md11.4 KB
    • references/ES2026.md7.9 KB
    • references/PROMISES.md7.3 KB
    • references/UPCOMING.md10 KB
    • SKILL.md3.4 KB

    Origin and licence

    Listed unmodified

    Author
    ccheney
    Source
    github.com/ccheney/robust-skills/tree/0eea7b060d12e3520556a73b15fbfa79480987d1/skills/modern-javascript
    Licence
    MIT

    Notice

    « modern-javascript » (ccheney, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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