feat(18147): skip uncessary parenthesis (microsoft#44769)

Author: a-tarasyuk

src/services/refactors/extractSymbol.ts

@@ -1141,7 +1141,7 @@ namespace ts.refactor.extractSymbol {
             ? undefined
             : checker.typeToTypeNode(checker.getContextualType(node)!, scope, NodeBuilderFlags.NoTruncation); // TODO: GH#18217
 
-        let initializer = transformConstantInitializer(node, substitutions);
+        let initializer = transformConstantInitializer(skipParentheses(node), substitutions);
 
         ({ variableType, initializer } = transformFunctionInitializerAndType(variableType, initializer));
 
@@ -1375,7 +1375,7 @@ namespace ts.refactor.extractSymbol {
         }
         let returnValueProperty: string | undefined;
         let ignoreReturns = false;
-        const statements = factory.createNodeArray(isBlock(body) ? body.statements.slice(0) : [isStatement(body) ? body : factory.createReturnStatement(body as Expression)]);
+        const statements = factory.createNodeArray(isBlock(body) ? body.statements.slice(0) : [isStatement(body) ? body : factory.createReturnStatement(skipParentheses(body as Expression))]);
         // rewrite body if either there are writes that should be propagated back via return statements or there are substitutions
         if (hasWritesOrVariableDeclarations || substitutions.size) {
             const rewrittenStatements = visitNodes(statements, visitor).slice();

tests/cases/fourslash/extract-const8.ts

@@ -0,0 +1,14 @@
+/// <reference path='fourslash.ts' />
+
+// @filename: foo.ts
+////const foo = 1 * /*a*/(2 + 2)/*b*/;
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Extract Symbol",
+    actionName: "constant_scope_0",
+    actionDescription: "Extract to constant in enclosing scope",
+    newContent:
+`const newLocal = 2 + 2;
+const foo = 1 * /*RENAME*/newLocal;`
+});

tests/cases/fourslash/extract-const9.ts

@@ -0,0 +1,14 @@
+/// <reference path='fourslash.ts' />
+
+// @filename: foo.ts
+////const foo = 1 * /*a*/(((((2 + 2)))))/*b*/;
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Extract Symbol",
+    actionName: "constant_scope_0",
+    actionDescription: "Extract to constant in enclosing scope",
+    newContent:
+`const newLocal = 2 + 2;
+const foo = 1 * /*RENAME*/newLocal;`
+});

tests/cases/fourslash/extract-method42.ts

@@ -0,0 +1,21 @@
+/// <reference path='fourslash.ts' />
+
+////function foo() {
+////	const x = 10 * /*a*/(10 + 10)/*b*/;
+////}
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Extract Symbol",
+    actionName: "function_scope_1",
+    actionDescription: "Extract to function in global scope",
+    newContent:
+`function foo() {
+	const x = 10 * /*RENAME*/newFunction();
+}
+
+function newFunction() {
+    return 10 + 10;
+}
+`
+});

tests/cases/fourslash/extract-method43.ts

@@ -0,0 +1,21 @@
+/// <reference path='fourslash.ts' />
+
+////function foo() {
+////	const x = 10 * /*a*/((((((10 + 10))))))/*b*/;
+////}
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Extract Symbol",
+    actionName: "function_scope_1",
+    actionDescription: "Extract to function in global scope",
+    newContent:
+`function foo() {
+	const x = 10 * /*RENAME*/newFunction();
+}
+
+function newFunction() {
+    return 10 + 10;
+}
+`
+});