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// This file extends the mw.log skeleton defined in startup/mediawiki.js. // Code that is not needed by mw.loader is placed here. /* eslint-disable no-console */ /** * Log debug messages and developer warnings to the browser console. * * See [mw.log()]{@link mw.log(2)} for verbose debug logging. * * @namespace mw.log */ /** * Create a function that returns true for the first call from any particular call stack. * * @private * @return {Function} * @return {boolean|undefined} return.return True if the caller was not seen before. */ function stackSet() { // Optimisation: Don't create or compute anything for the common case // where deprecations are not triggered. let stacks; return function isFirst() { if ( !stacks ) { stacks = new Set(); } const stack = new Error().stack; if ( !stacks.has( stack ) ) { stacks.add( stack ); return true; } }; } /** * Write a message to the browser console's error channel. * * Most browsers also print a stacktrace when calling this method if the * argument is an Error object. * * @since 1.26 * @method * @param {...Mixed} msg Messages to output to console */ mw.log.error = Function.prototype.bind.call( console.error, console ); /** * Create a function that logs a deprecation warning when called. * * @example * var deprecatedNoB = mw.log.makeDeprecated( 'hello_without_b', 'Use of hello without b is deprecated.' ); * * function hello( a, b ) { * if ( b === undefined ) { * deprecatedNoB(); * b = 0; * } * return a + b; * } * * hello( 1 ); * * @since 1.38 * @param {string|null} key Name of the feature for deprecation tracker, * or null for a console-only deprecation. * @param {string} msg Deprecation warning. * @return {Function} */ mw.log.makeDeprecated = function ( key, msg ) { const isFirst = stackSet(); return function maybeLog() { if ( isFirst() ) { if ( key ) { mw.track( 'mw.deprecate', key ); } mw.log.warn( msg ); } }; }; /** * Create a property on a host object that, when accessed, will log * a deprecation warning to the console. * * @example * mw.log.deprecate( window, 'myGlobalFn', myGlobalFn ); * * @example * mw.log.deprecate( Thing, 'old', old, 'Use Other.thing instead', 'Thing.old' ); * * @param {Object} obj Host object of deprecated property * @param {string} key Name of property to create in `obj` * @param {any} val The value this property should return when accessed * @param {string} [msg] Optional extra text to add to the deprecation warning * @param {string} [logName] Name of the feature for deprecation tracker. * Tracking is disabled by default, except for global variables on `window`. */ mw.log.deprecate = function ( obj, key, val, msg, logName ) { const maybeLog = mw.log.makeDeprecated( logName || ( obj === window ? key : null ), 'Use of "' + ( logName || key ) + '" is deprecated.' + ( msg ? ' ' + msg : '' ) ); Object.defineProperty( obj, key, { configurable: true, enumerable: true, get: function () { maybeLog(); return val; }, set: function ( newVal ) { maybeLog(); val = newVal; } } ); };
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