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/** * @class mw.errorLogger * @singleton */ 'use strict'; /** * Fired via mw.track when an error is not handled by local code and is caught by the * window.onerror handler. * * @event global_error * @param {string} errorMessage Error message. * @param {string} url URL where error was raised. * @param {number} line Line number where error was raised. * @param {number} [column] Line number where error was raised. Not all browsers * support this. * @param {Error|Mixed} [errorObject] The error object. Typically an instance of Error, but * anything (even a primitive value) passed to a throw clause will end up here. */ /** * Fired via mw.track when an error is logged with mw.errorLogger#logError. * * @event error_caught * @param {Error} errorObject The error object */ /** * Install a `window.onerror` handler that logs errors by notifying both `global.error` and * `error.uncaught` topic subscribers that an event has occurred. Note well that the former is * done for backwards compatibilty. * * @private * @param {Object} window * @fires global_error * @fires error_caught */ function installGlobalHandler( window ) { // We will preserve the return value of the previous handler. window.onerror works the // opposite way than normal event handlers (returning true will prevent the default // action, returning false will let the browser handle the error normally, by e.g. // logging to the console), so our fallback old handler needs to return false. var oldHandler = window.onerror || function () { return false; }; window.onerror = function ( errorMessage, url, line, column, errorObject ) { mw.track( 'global.error', { errorMessage: errorMessage, url: url, lineNumber: line, columnNumber: column, stackTrace: errorObject ? errorObject.stack : '', errorObject: errorObject } ); if ( errorObject ) { mw.track( 'error.uncaught', errorObject ); } return oldHandler.apply( this, arguments ); }; } mw.errorLogger = { /** * Logs an error by notifying subscribers to the given mw.track() topic * (by default `error.caught`) that an event has occurred. * * @param {Error} error * @param {string} [topic='error.caught'] Error topic. Conventionally in the form * 'error.⧼component⧽' (where ⧼component⧽ identifies the code logging the error at a * high level; e.g. an extension name). * @fires error_caught */ logError: function ( error, topic ) { mw.track( topic || 'error.caught', error ); } }; if ( window.QUnit ) { mw.errorLogger.installGlobalHandler = installGlobalHandler; } else { installGlobalHandler( window ); }
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