How to use the @sindresorhus/is.array function in @sindresorhus/is

}

	if (opts.json && is.undefined(opts.headers.accept)) {
		opts.headers.accept = 'application/json';
	}

	const body = opts.body;
	if (is.nullOrUndefined(body)) {
		opts.method = (opts.method || 'GET').toUpperCase();
	} else {
		const headers = opts.headers;
		if (!is.nodeStream(body) && !is.string(body) && !is.buffer(body) && !(opts.form || opts.json)) {
			throw new TypeError('The `body` option must be a stream.Readable, string, Buffer or plain Object');
		}

		const canBodyBeStringified = is.plainObject(body) || is.array(body);
		if ((opts.form || opts.json) && !canBodyBeStringified) {
			throw new TypeError('The `body` option must be a plain Object or Array when the `form` or `json` option is used');
		}

		if (isFormData(body)) {
			// Special case for https://github.com/form-data/form-data
			headers['content-type'] = headers['content-type'] || `multipart/form-data; boundary=${body.getBoundary()}`;
		} else if (opts.form && canBodyBeStringified) {
			headers['content-type'] = headers['content-type'] || 'application/x-www-form-urlencoded';
			opts.body = querystring.stringify(body);
		} else if (opts.json && canBodyBeStringified) {
			headers['content-type'] = headers['content-type'] || 'application/json';
			opts.body = JSON.stringify(body);
		}

		if (is.undefined(headers['content-length']) && is.undefined(headers['transfer-encoding']) && !is.nodeStream(body)) {

}

	if (opts.json && is.undefined(opts.headers.accept)) {
		opts.headers.accept = 'application/json';
	}

	const body = opts.body;
	if (is.nullOrUndefined(body)) {
		opts.method = (opts.method || 'GET').toUpperCase();
	} else {
		const headers = opts.headers;
		if (!is.nodeStream(body) && !is.string(body) && !is.buffer(body) && !(opts.form || opts.json)) {
			throw new TypeError('The `body` option must be a stream.Readable, string, Buffer or plain Object');
		}

		const canBodyBeStringified = is.plainObject(body) || is.array(body);
		if ((opts.form || opts.json) && !canBodyBeStringified) {
			throw new TypeError('The `body` option must be a plain Object or Array when the `form` or `json` option is used');
		}

		if (isFormData(body)) {
			// Special case for https://github.com/form-data/form-data
			headers['content-type'] = headers['content-type'] || `multipart/form-data; boundary=${body.getBoundary()}`;
		} else if (opts.form && canBodyBeStringified) {
			headers['content-type'] = headers['content-type'] || 'application/x-www-form-urlencoded';
			opts.body = querystring.stringify(body);
		} else if (opts.json && canBodyBeStringified) {
			headers['content-type'] = headers['content-type'] || 'application/json';
			opts.body = JSON.stringify(body);
		}

		if (is.undefined(headers['content-length']) && is.undefined(headers['transfer-encoding']) && !is.nodeStream(body)) {

}

	if (options.decompress && is.undefined(headers['accept-encoding'])) {
		headers['accept-encoding'] = 'gzip, deflate';
	}

	const {body} = options;
	if (is.nullOrUndefined(body)) {
		options.method = options.method ? options.method.toUpperCase() : 'GET';
	} else {
		const isObject = is.object(body) && !is.buffer(body) && !is.nodeStream(body);
		if (!is.nodeStream(body) && !is.string(body) && !is.buffer(body) && !(options.form || options.json)) {
			throw new TypeError('The `body` option must be a stream.Readable, string or Buffer');
		}

		if (options.json && !(isObject || is.array(body))) {
			throw new TypeError('The `body` option must be an Object or Array when the `json` option is used');
		}

		if (options.form && !isObject) {
			throw new TypeError('The `body` option must be an Object when the `form` option is used');
		}

		if (isFormData(body)) {
			// Special case for https://github.com/form-data/form-data
			headers['content-type'] = headers['content-type'] || `multipart/form-data; boundary=${body.getBoundary()}`;
		} else if (options.form) {
			headers['content-type'] = headers['content-type'] || 'application/x-www-form-urlencoded';
			options.body = (new URLSearchParams(body)).toString();
		} else if (options.json) {
			headers['content-type'] = headers['content-type'] || 'application/json';
			options.body = JSON.stringify(body);

module.exports = function deepFreeze(object) {
	for (const [key, value] of Object.entries(object)) {
		if (is.plainObject(value) || is.array(value)) {
			deepFreeze(object[key]);
		}
	}

	return Object.freeze(object);
};

const pathToPipeline = (path) => is.array(path)
  ? pathPipelineSetAlts(path)
  : [path]

export default function deepFreeze(object: T): Readonly {
	for (const value of Object.values(object)) {
		if (is.plainObject(value) || is.array(value)) {
			deepFreeze(value);
		}
	}

	return Object.freeze(object);
}

const normalizeFieldMapping = (transformers = {}, switchTransforms = false) => (def) => (is.string(def) || is.array(def))
  ? pathToPipeline(def)
  : createFieldPipeline(def, transformers, switchTransforms)