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`Console` constructor checks that `stdout.write()` is a function but does not do an equivalent check for `stderr.write()`. If `stderr` is not specified in the constructor, then `stderr` is set to be `stdout`. However, if `stderr` is specified, but `stderr.write()` is not a function, then an exception is not thrown until `console.error()` is called. This change adds the same check for 'stderr' in the constructor that is there for `stdout`. If `stderr` fails the check, then a `TypeError` is thrown. Took the opportunity to copyedit the `console` doc a little too. PR-URL: https://github.com/nodejs/node/pull/5635 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Rod Vagg <rod@vagg.org>
102 lines
2.5 KiB
JavaScript
102 lines
2.5 KiB
JavaScript
'use strict';
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const util = require('util');
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function Console(stdout, stderr) {
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if (!(this instanceof Console)) {
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return new Console(stdout, stderr);
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}
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if (!stdout || typeof stdout.write !== 'function') {
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throw new TypeError('Console expects a writable stream instance');
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}
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if (!stderr) {
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stderr = stdout;
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} else if (typeof stderr.write !== 'function') {
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throw new TypeError('Console expects writable stream instances');
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}
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var prop = {
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writable: true,
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enumerable: false,
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configurable: true
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};
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prop.value = stdout;
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Object.defineProperty(this, '_stdout', prop);
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prop.value = stderr;
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Object.defineProperty(this, '_stderr', prop);
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prop.value = new Map();
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Object.defineProperty(this, '_times', prop);
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// bind the prototype functions to this Console instance
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var keys = Object.keys(Console.prototype);
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for (var v = 0; v < keys.length; v++) {
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var k = keys[v];
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this[k] = this[k].bind(this);
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}
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}
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Console.prototype.log = function() {
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this._stdout.write(util.format.apply(null, arguments) + '\n');
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};
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Console.prototype.info = Console.prototype.log;
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Console.prototype.warn = function() {
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this._stderr.write(util.format.apply(null, arguments) + '\n');
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};
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Console.prototype.error = Console.prototype.warn;
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Console.prototype.dir = function(object, options) {
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this._stdout.write(util.inspect(object, util._extend({
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customInspect: false
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}, options)) + '\n');
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};
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Console.prototype.time = function(label) {
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this._times.set(label, process.hrtime());
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};
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Console.prototype.timeEnd = function(label) {
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var time = this._times.get(label);
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if (!time) {
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throw new Error('No such label: ' + label);
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}
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const duration = process.hrtime(time);
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const ms = duration[0] * 1000 + duration[1] / 1e6;
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this.log('%s: %sms', label, ms.toFixed(3));
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this._times.delete(label);
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};
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Console.prototype.trace = function trace() {
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// TODO probably can to do this better with V8's debug object once that is
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// exposed.
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var err = new Error();
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err.name = 'Trace';
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err.message = util.format.apply(null, arguments);
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Error.captureStackTrace(err, trace);
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this.error(err.stack);
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};
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Console.prototype.assert = function(expression) {
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if (!expression) {
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const argsLen = arguments.length || 1;
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const arr = new Array(argsLen - 1);
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for (var i = 1; i < argsLen; i++)
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arr[i - 1] = arguments[i];
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require('assert').ok(false, util.format.apply(null, arr));
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}
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};
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module.exports = new Console(process.stdout, process.stderr);
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module.exports.Console = Console;
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