fix(41212,41334): removed duplicate interface extensions (microsoft#1112)

Author: neotan

baselines/dom.generated.d.ts

@@ -6048,7 +6048,7 @@ interface HTMLElementEventMap extends ElementEventMap, DocumentAndElementEventHa
 }
 
 /** Any HTML element. Some elements directly implement this interface, while others implement it via an interface that inherits it. */
-interface HTMLElement extends Element, DocumentAndElementEventHandlers, ElementCSSInlineStyle, ElementCSSInlineStyle, ElementContentEditable, GlobalEventHandlers, HTMLOrSVGElement {
+interface HTMLElement extends Element, DocumentAndElementEventHandlers, ElementCSSInlineStyle, ElementContentEditable, GlobalEventHandlers, HTMLOrSVGElement {
     accessKey: string;
     readonly accessKeyLabel: string;
     autocapitalize: string;
@@ -11379,7 +11379,7 @@ interface SVGElementEventMap extends ElementEventMap, DocumentAndElementEventHan
 }
 
 /** All of the SVG DOM interfaces that correspond directly to elements in the SVG language derive from the SVGElement interface. */
-interface SVGElement extends Element, DocumentAndElementEventHandlers, DocumentAndElementEventHandlers, ElementCSSInlineStyle, GlobalEventHandlers, GlobalEventHandlers, HTMLOrSVGElement {
+interface SVGElement extends Element, DocumentAndElementEventHandlers, ElementCSSInlineStyle, GlobalEventHandlers, HTMLOrSVGElement {
     /** @deprecated */
     readonly className: any;
     readonly ownerSVGElement: SVGSVGElement | null;

inputfiles/addedTypes.jsonc

@@ -757,12 +757,6 @@
                     ]
                 }
             },
-            "SVGElement": {
-                "implements": [
-                    "GlobalEventHandlers",
-                    "DocumentAndElementEventHandlers"
-                ]
-            },
             "Text": {
                 "name": "Text",
                 "properties": {
@@ -817,11 +811,6 @@
                     }
                 }
             },
-            "HTMLElement": {
-                "implements": [
-                    "ElementCSSInlineStyle"
-                ]
-            },
             "HTMLInputElement": {
                 "properties": {
                     "property": {

src/build/emitter.ts

@@ -8,6 +8,7 @@ import {
   arrayToMap,
   integerTypes,
   baseTypeConversionMap,
+  assertUnique,
 } from "./helpers.js";
 import { collectLegacyNamespaceTypes } from "./legacy-namespace.js";
 
@@ -1198,7 +1199,7 @@ export function emitWebIdl(
       .map(processIName);
 
     if (finalExtends.length) {
-      printer.print(` extends ${finalExtends.join(", ")}`);
+      printer.print(` extends ${assertUnique(finalExtends).join(", ")}`);
     }
     printer.print(" {");
     printer.endLine();
@@ -1314,7 +1315,7 @@ export function emitWebIdl(
       printer.print(`interface ${i.name}EventMap`);
       if (ehParentCount) {
         const extend = iNameToEhParents[i.name].map((i) => i.name + "EventMap");
-        printer.print(` extends ${extend.join(", ")}`);
+        printer.print(` extends ${assertUnique(extend).join(", ")}`);
       }
       printer.print(" {");
       printer.endLine();

src/build/helpers.ts

@@ -325,3 +325,10 @@ export function followTypeReferences(
     }
   }
 }
+
+export function assertUnique(list: string[]): string[] {
+  if (new Set(list).size < list.length) {
+    throw new Error(`Duplicate items found in the list: ${list}`);
+  }
+  return list;
+}