/**
 * Works similarly to `Array.prototype.indexOf`, but instead of strict equality - uses provided equality method
 * @template T
 * @param {T[]} array
 * @param {T} element
 * @param {function(a:T,b:T):boolean} equals
 * @returns {number} index of first match or -1 if no matches found
 */
export function array_index_by_equality<T>(array: T[], element: T, equals: any): number;
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