| 1 | import { OptionalFindOptions } from './findoptions';
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| 2 | /**
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| 3 | * Returns the first element of an iterable sequence that matches the predicate if provided, or undefined if no such element exists.
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| 4 | *
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| 5 | * @export
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| 6 | * @template T The type of the elements in the source sequence.
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| 7 | * @param {Iterable<T>} source Source async-enumerable sequence.
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| 8 | * @returns {(S | undefined)} The first element in the iterable sequence, or undefined if no such element exists.
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| 9 | */
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| 10 | export declare function first<T>(source: Iterable<T>, options?: OptionalFindOptions<T>): T | undefined;
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