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Posts tagged “iterators”

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TypeScript 6.0 `--strictBuiltinIteratorReturn`: What Changes When Iterators Finally Have Correct Return Types

TypeScript 6.0 `--strictBuiltinIteratorReturn`: What Changes When Iterators Finally Have Correct Return Types

September 14, 2026

The iterator return type loophole that existed since TypeScript 2.3 is finally closing. Learn how --strictBuiltinIteratorReturn affects code that relies on iterator protocol semantics and what breaks when you flip the switch.

typescriptiteratorsstrictBuiltinIteratorReturn+2