22 lines
1.3 KiB
Plaintext
22 lines
1.3 KiB
Plaintext
// Backwards-compatible iterator interfaces, augmented with iterator helper methods by lib.esnext.iterator in TypeScript 5.6.
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// The IterableIterator interface does not contain these methods, which creates assignability issues in places where IteratorObjects
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// are expected (eg. DOM-compatible APIs) if lib.esnext.iterator is loaded.
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// Also ensures that iterators returned by the Node API, which inherit from Iterator.prototype, correctly expose the iterator helper methods
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// if lib.esnext.iterator is loaded.
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// TODO: remove once this package no longer supports TS 5.5, and replace NodeJS.BuiltinIteratorReturn with BuiltinIteratorReturn.
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// Placeholders for TS <5.6
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interface IteratorObject<T, TReturn, TNext> {}
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interface AsyncIteratorObject<T, TReturn, TNext> {}
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declare namespace NodeJS {
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// Populate iterator methods for TS <5.6
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interface Iterator<T, TReturn, TNext> extends globalThis.Iterator<T, TReturn, TNext> {}
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interface AsyncIterator<T, TReturn, TNext> extends globalThis.AsyncIterator<T, TReturn, TNext> {}
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// Polyfill for TS 5.6's instrinsic BuiltinIteratorReturn type, required for DOM-compatible iterators
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type BuiltinIteratorReturn = ReturnType<any[][typeof Symbol.iterator]> extends
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globalThis.Iterator<any, infer TReturn> ? TReturn
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: any;
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}
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