fix(40609): Crash on extract to type alias

src/services/refactors/extractType.ts

@@ -140,7 +140,7 @@ namespace ts.refactor {
                     if (symbol) {
                         const declaration = cast(first(symbol.declarations), isTypeParameterDeclaration);
                         if (rangeContainsSkipTrivia(statement, declaration, file) && !rangeContainsSkipTrivia(selection, declaration, file)) {
-                            result.push(declaration);
+                            pushIfUnique(result, declaration);
                         }
                     }
                 }

tests/cases/fourslash/refactorExtractType69.ts

@@ -0,0 +1,25 @@
+/// <reference path='fourslash.ts' />
+
+////type Foo<T> = {
+////    fn:
+////        keyof T extends string
+////            ? /*a*/(x: `${keyof T}Foo`, callback: (y: keyof T) => void) => void/*b*/
+////            : never;
+////}
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Extract type",
+    actionName: "Extract to type alias",
+    actionDescription: "Extract to type alias",
+    newContent: [
+        "type /*RENAME*/NewType<T> = (x: `${keyof T}Foo`, callback: (y: keyof T) => void) => void;",
+        "",
+        "type Foo<T> = {",
+        "    fn:",
+        "        keyof T extends string",
+        "            ? NewType<T>",
+        "            : never;",
+        "}"
+    ].join("\n"),
+});

tests/cases/fourslash/refactorExtractType70.ts

@@ -0,0 +1,19 @@
+/// <reference path='fourslash.ts' />
+
+////type Foo<T1, T2, T3> = {
+////    fn: /*a*/(a: T1, b: T2, c: T3, a1: T1, a2: T2, a3: T3) => void;/*b*/
+////}
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Extract type",
+    actionName: "Extract to type alias",
+    actionDescription: "Extract to type alias",
+    newContent: [
+        "type /*RENAME*/NewType<T1, T2, T3> = (a: T1, b: T2, c: T3, a1: T1, a2: T2, a3: T3) => void;",
+        "",
+        "type Foo<T1, T2, T3> = {",
+        "    fn: NewType<T1, T2, T3>;",
+        "}"
+    ].join("\n"),
+});