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Apply modern JavaScript best practices when writing, reviewing, or refactoring JS/TS code. Use this skill whenever the user asks you to write JavaScript or TypeScript code, review existing JS/TS code, refactor a JS/TS file, debug JS logic, scaffold a JS project, or asks how to do something "the right way" in JS. Also trigger for any task involving Node.js scripts, browser JS, React/Vue/Svelte components, or async JS patterns. Even if the user doesn't explicitly say "best practices", apply this skill proactively any time JS/TS code is being produced or touched — clean, idiomatic code should be the default.