default_stream.js

'use strict';

var through = require('@ljharb/through');
var fs = require('fs');

/** @type {import('./default_stream')} */
module.exports = function () {
	var line = '';
	var stream = through(write, flush);
	return stream;

	/** @type {(buf: unknown) => void} */
	function write(buf) {
		if (
			buf == null // eslint-disable-line eqeqeq
			|| (Object(buf) !== buf && typeof buf !== 'string')
		) {
			flush();
			return;
		}
		var b = /** @type {string | ArrayLike<number>} */ (buf); // eslint-disable-line no-extra-parens
		for (var i = 0; i < b.length; i++) {
			var c = typeof b === 'string'
				? b.charAt(i)
				: String.fromCharCode(b[i]);
			if (c === '\n') {
				flush();
			} else {
				line += c;
			}
		}
	}

	function flush() {
		if (fs.writeSync && (/^win/).test(process.platform)) {
			try {
				fs.writeSync(1, line + '\n');
			} catch (e) {
				stream.emit('error', e);
			}
		} else {
			try {
				if (typeof console !== 'undefined' && console.log) { // eslint-disable-line no-console
					console.log(line); // eslint-disable-line no-console
				} else if (typeof document !== 'undefined') {
					// for IE < 9
					document.body.innerHTML += line + '<br />';
				}
			} catch (e) {
				stream.emit('error', e);
			}
		}
		line = '';
	}
};