Function pipeLoggingToParent

src/bootstrap-fork.ts:14–154

()

//#region Helpers

function pipeLoggingToParent(): void {
	const MAX_STREAM_BUFFER_LENGTH = 1024 * 1024;
	const MAX_LENGTH = 100000;

	/**
	 * Prevent circular stringify and convert arguments to real array
	 */
	function safeToString(args: ArrayLike<unknown>): string {
		const seen: unknown[] = [];
		const argsArray: unknown[] = [];

		// Massage some arguments with special treatment
		if (args.length) {
			for (let i = 0; i < args.length; i++) {
				let arg = args[i];

				// Any argument of type 'undefined' needs to be specially treated because
				// JSON.stringify will simply ignore those. We replace them with the string
				// 'undefined' which is not 100% right, but good enough to be logged to console
				if (typeof arg === 'undefined') {
					arg = 'undefined';
				}

				// Any argument that is an Error will be changed to be just the error stack/message
				// itself because currently cannot serialize the error over entirely.
				else if (arg instanceof Error) {
					const errorObj = arg;
					if (errorObj.stack) {
						arg = errorObj.stack;
					} else {
						arg = errorObj.toString();
					}
				}

				argsArray.push(arg);
			}
		}

		try {
			const res = JSON.stringify(argsArray, function (key, value: unknown) {

				// Objects get special treatment to prevent circles
				if (isObject(value) || Array.isArray(value)) {
					if (seen.indexOf(value) !== -1) {
						return '[Circular]';
					}

					seen.push(value);
				}

				return value;
			});

			if (res.length > MAX_LENGTH) {
				return 'Output omitted for a large object that exceeds the limits';
			}

			return res;