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import type {KyHeadersInit, Options} from '../types/options.js';import {isObject} from './is.js';
export const validateAndMerge = (...sources: Array<Partial<Options> | undefined>): Partial<Options> => {	for (const source of sources) {		if ((!isObject(source) || Array.isArray(source)) && typeof source !== 'undefined') {			throw new TypeError('The `options` argument must be an object');		}	}
	return deepMerge({}, ...sources);};
export const mergeHeaders = (source1: KyHeadersInit = {}, source2: KyHeadersInit = {}) => {	const result = new globalThis.Headers(source1 as HeadersInit);	const isHeadersInstance = source2 instanceof globalThis.Headers;	const source = new globalThis.Headers(source2 as HeadersInit);
	for (const [key, value] of source.entries()) {		if ((isHeadersInstance && value === 'undefined') || value === undefined) {			result.delete(key);		} else {			result.set(key, value);		}	}
	return result;};
// TODO: Make this strongly-typed (no `any`).export const deepMerge = <T>(...sources: Array<Partial<T> | undefined>): T => {	let returnValue: any = {};	let headers = {};
	for (const source of sources) {		if (Array.isArray(source)) {			if (!Array.isArray(returnValue)) {				returnValue = [];			}
			returnValue = [...returnValue, ...source];		} else if (isObject(source)) {			for (let [key, value] of Object.entries(source)) {				if (isObject(value) && key in returnValue) {					value = deepMerge(returnValue[key], value);				}
				returnValue = {...returnValue, [key]: value};			}
			if (isObject((source as any).headers)) {				headers = mergeHeaders(headers, (source as any).headers);				returnValue.headers = headers;			}		}	}
	return returnValue;};