import type { testFn } from './_types';
/**
 * Finds index of leftmost value passing a test.
 * @param x an array
 * @param ft test function (v, i, x)
 * @returns index of value, -1 if not found
 */
declare function findIndex<T>(x: Iterable<T>, ft: testFn<T>): number;
export default findIndex;
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