resourceloader: Log each deprecation only once from mw.log.deprecate

Bug: T100412
Change-Id: I0111f0ed84b74774b6665aca2625d07ea53cfc8c

diff --git a/resources/src/mediawiki/mediawiki.js b/resources/src/mediawiki/mediawiki.js
index 942f4ae..3600000 100644 (file)
--- a/resources/src/mediawiki/mediawiki.js
+++ b/resources/src/mediawiki/mediawiki.js
@@ -660,18 +660,47 @@
                        log.deprecate = !Object.defineProperty ? function ( obj, key, val ) {
                                obj[ key ] = val;
                        } : function ( obj, key, val, msg ) {
+                               /*globals Set */
                                msg = 'Use of "' + key + '" is deprecated.' + ( msg ? ( ' ' + msg ) : '' );
+                               var logged, loggedIsSet, uniqueTrace;
+                               if ( window.Set ) {
+                                       logged = new Set();
+                                       loggedIsSet = true;
+                               } else {
+                                       logged = {};
+                                       loggedIsSet = false;
+                               }
+                               uniqueTrace = function () {
+                                       var trace = new Error().stack;
+                                       if ( loggedIsSet ) {
+                                               if ( logged.has( trace ) ) {
+                                                       return false;
+                                               }
+                                               logged.add( trace );
+                                               return true;
+                                       } else {
+                                               if ( logged.hasOwnProperty( trace ) ) {
+                                                       return false;
+                                               }
+                                               logged[ trace ] = 1;
+                                               return true;
+                                       }
+                               };
                                Object.defineProperty( obj, key, {
                                        configurable: true,
                                        enumerable: true,
                                        get: function () {
-                                               mw.track( 'mw.deprecate', key );
-                                               mw.log.warn( msg );
+                                               if ( uniqueTrace() ) {
+                                                       mw.track( 'mw.deprecate', key );
+                                                       mw.log.warn( msg );
+                                               }
                                                return val;
                                        },
                                        set: function ( newVal ) {
-                                               mw.track( 'mw.deprecate', key );
-                                               mw.log.warn( msg );
+                                               if ( uniqueTrace() ) {
+                                                       mw.track( 'mw.deprecate', key );
+                                                       mw.log.warn( msg );
+                                               }
                                                val = newVal;
                                        }
                                } );