[Fix] Add avoid parens config for Printer

lib/options.ts

@@ -157,6 +157,12 @@ export interface Options extends DeprecatedOptions {
    * @default true
    */
   tokens?: boolean;
+
+  /**
+   * Whether to add parens around statements when possible while printing the AST.
+   * @default false
+   */
+  avoidParens?: boolean;
 }
 
 interface DeprecatedOptions {
@@ -184,6 +190,7 @@ const defaults: Options = {
   arrowParensAlways: false,
   flowObjectCommas: true,
   tokens: true,
+  avoidParens: false,
 };
 const hasOwn = defaults.hasOwnProperty;
 
@@ -219,5 +226,6 @@ export function normalize(opts?: Options): NormalizedOptions {
     arrowParensAlways: get("arrowParensAlways"),
     flowObjectCommas: get("flowObjectCommas"),
     tokens: !!get("tokens"),
+    avoidParens: !!get("avoidParens"),
   };
 }

lib/printer.ts

@@ -202,7 +202,7 @@ function genericPrint(path: any, config: any, options: any, printPath: any) {
   if (decoratorsLines.isEmpty()) {
     // Nodes with decorators can't have parentheses, so we can avoid
     // computing path.needsParens() except in this case.
-    if (!options.avoidRootParens) {
+    if (!options.avoidRootParens && !config.avoidParens) {
       shouldAddParens = path.needsParens();
     }
   } else {

test/printer.ts

@@ -2565,4 +2565,32 @@ describe("printer", function () {
       ),
     );
   });
+
+  const withoutParens = [
+    "async function add(a, b) {",
+    "  const z = foo || await getFoo();",
+    "  return z;",
+    "}"
+  ].join(eol);
+
+  const withParens = [
+    "async function add(a, b) {",
+    "  const z = foo || (await getFoo());",
+    "  return z;",
+    "}"
+  ].join(eol);
+
+  it("With & without parens added to reprinted code", function () {
+    const ast = parse(withoutParens);
+    let printer = new Printer({ tabWidth: 2 });
+
+    const withParensPrinted = printer.print(ast).code; // Default behaviour
+    assert.strictEqual(typeof withParensPrinted, "string");
+    assert.strictEqual(withParensPrinted, withParens);
+
+    printer = new Printer({ tabWidth: 2, avoidParens: true });
+    const reprinted = printer.print(ast).code;
+    assert.strictEqual(typeof reprinted, "string");
+    assert.strictEqual(reprinted, withoutParens);
+  });
 });