fix compiler error

Author: saschanaz

src/emitter.ts

@@ -689,7 +689,7 @@ export function emitWebIdl(webidl: Browser.WebIdl, flavor: Flavor) {
 
     /// Emit the properties and methods of a given interface
     function emitMembers(prefix: string, emitScope: EmitScope, i: Browser.Interface) {
-        const conflictedMembers = extendConflictsBaseTypes[i.name] ? extendConflictsBaseTypes[i.name].memberNames : new Set();
+        const conflictedMembers = extendConflictsBaseTypes[i.name] ? extendConflictsBaseTypes[i.name].memberNames : new Set<string>();
         emitProperties(prefix, emitScope, i);
         const methodPrefix = prefix.startsWith("declare var") ? "declare function " : "";
         emitMethods(methodPrefix, emitScope, i, conflictedMembers);

src/widlprocess.ts

@@ -197,7 +197,7 @@ function convertOperation(operation: webidl2.OperationMemberType, inheritedExpos
         throw new Error("Unexpected anonymous operation");
     }
     return {
-        name: operation.name,
+        name: operation.name || undefined,
         signature: [{
             ...convertIdlType(operation.idlType),
             param: operation.arguments.map(convertArgument)