querystring.mjs
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querystring.mjs
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	const plusPattern = /\+/g;
	const defaultMaxKeys = 1000;

	export const escape = value => encodeURIComponent(String(value));
	export const normalizeComponent = value => String(value).replace(plusPattern, '%20');

	export function unescape(value) {
	const input = normalizeComponent(value);

	try {
	return decodeURIComponent(input);
	} catch {
	return input;
	}
	}

	const getOptions = options => (options && typeof options === 'object' ? options : null);

	const appendValue = (target, key, value) => {
	if (target[key] === undefined) {
	target[key] = value;
	return;
	}

	target[key] = Array.isArray(target[key]) ? [...target[key], value] : [target[key], value];
	};

	export function parse(input, sep = '&', eq = '=', options = undefined) {
	const result = Object.create(null);
	const source = String(input \|\| '');
	const parsedOptions = getOptions(options);
	const maxKeys = typeof parsedOptions?.maxKeys === 'number' ? parsedOptions.maxKeys : defaultMaxKeys;
	const decode = typeof parsedOptions?.decodeURIComponent === 'function' ? parsedOptions.decodeURIComponent : unescape;

	if (source === '') return result;

	let count = 0;
	for (const entry of source.split(sep)) {
	if (entry === '') continue;
	if (maxKeys > 0 && count >= maxKeys) break;

	const index = entry.indexOf(eq);
	const rawKey = index >= 0 ? entry.slice(0, index) : entry;
	const rawValue = index >= 0 ? entry.slice(index + eq.length) : '';
	const key = decode(normalizeComponent(rawKey));
	const value = decode(normalizeComponent(rawValue));

	appendValue(result, key, value);
	count += 1;
	}

	return result;
	}

	export function stringify(obj, sep = '&', eq = '=', options = undefined) {
	const parsedOptions = getOptions(options);
	const encode = typeof parsedOptions?.encodeURIComponent === 'function' ? parsedOptions.encodeURIComponent : escape;

	if (obj === null \|\| obj === undefined) return '';
	const parts = [];

	for (const key of Object.keys(obj)) {
	const value = obj[key];
	const encodedKey = encode(key);

	if (Array.isArray(value)) {
	for (const item of value) parts.push(encodedKey + eq + encode(item ?? ''));
	continue;
	}

	parts.push(encodedKey + eq + encode(value ?? ''));
	}

	return parts.join(sep);
	}

	export const encode = stringify;
	export const decode = parse;

	export default { parse, stringify, escape, unescape, encode, decode };

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