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TypeScript 5.7 and ES2024: Why the "Target" Flag Suddenly Matters Again

TS 5.7 adds es2024 target/lib (groupBy, withResolvers). Target choice now gates runtime support and polyfills.

5 min read Updated 2025

New ES2024 features mean your --target controls emitted syntax and runtime requirements. Revisit browserslist/Node minimums.

Feature availability

GroupBy / withResolvers: native in latest Node & evergreen browsers; polyfill older runtimes.

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