| 1 | /**
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| 2 | * Returns the first element in a sequence that satisfies a specified condition if provided, else
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| 3 | * the first element in the sequence.
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| 4 | * @param {Iterable<T>} source Source collection
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| 5 | * @param {function:(value: T): boolean} [selector] An optional function to test each element for a condition.
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| 6 | * @returns {T | undefined} The first element in the sequence that passes the test in the
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| 7 | * specified predicate function if provided, else the first element. If there are no elements,
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| 8 | * undefined is returned.
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| 9 | */
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| 10 | export declare function first<T, S extends T>(source: Iterable<T>, predicate: (value: T, index: number) => value is S): S | undefined;
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| 11 | export declare function first<T>(source: Iterable<T>, predicate?: (value: T, index: number) => boolean): T | undefined;
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