Add missing parentheses to arrow function in TSInstantiationExpression (#17724)

changelog_unreleased/typescript/17724.md

@@ -0,0 +1,13 @@
+#### Add missing parentheses to arrow function in instantiation expression (#17724 by @fisker)
+
+<!-- prettier-ignore -->
+```tsx
+// Input
+void (<_T extends never>() => {})<never>;
+
+// Prettier stable
+void <_T extends never>() => {}<never>;
+
+// Prettier main
+void (<_T extends never>() => {})<never>;
+```

src/language-js/needs-parens.js

@@ -881,6 +881,9 @@ function needsParens(path, options) {
         case "MatchExpressionCase":
           return true;
 
+        case "TSInstantiationExpression":
+          return key === "expression";
+
         case "ConditionalExpression":
           return key === "test";
 

tests/format/typescript/instantiation-expression/17714.ts

@@ -0,0 +1 @@
+void (<_T extends never>() => {})<never>;

tests/format/typescript/instantiation-expression/__snapshots__/format.test.js.snap

@@ -1,5 +1,19 @@
 // Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
 
+exports[`17714.ts format 1`] = `
+====================================options=====================================
+parsers: ["typescript"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+void (<_T extends never>() => {})<never>;
+
+=====================================output=====================================
+void (<_T extends never>() => {})<never>;
+
+================================================================================
+`;
+
 exports[`basic.ts format 1`] = `
 ====================================options=====================================
 parsers: ["typescript"]