fix(emit): (v) => ({value: v}).value is printed as invalid (v) =>{value:v}.value #510

When an arrow body starts with a parenthesized object literal but isn't only that object (member access, call, and so on), the emitter drops the parentheses. The output is invalid JS, or JS with a different meaning.

Repro (input transform)

import {Directive, Input} from '@angular/core';
@Directive({selector: '[d]'})
export class D {
  @Input({transform: (v: any) => ({value: v}).value}) a: any;
}

Repro (provider factory)

import {Component} from '@angular/core';
@Component({selector: 'c', template: '', providers: [{provide: 'T', useFactory: () => ({a: 1}).a}]})
export class C {}

OXC (main and #504 tip)

inputs:{a:[2,"a","a",(v) =>{value:v}.value]}
// setClassMetadata
args:[{transform:(v) =>{value:v}.value}]

i0.ɵɵProvidersFeature([{provide:"T",useFactory:() =>{a:1}.a}])

ngtsc 22.1.7

inputs: { a: [2, "a", "a", (v) => ({ value: v }).value] }

i0.ɵɵProvidersFeature([{ provide: 'T', useFactory: () => ({ a: 1 }).a }])

Where

crates/oxc_angular_compiler/src/output/emitter.rs (main ~L742 and ~L766):

• OutputExpression::Parenthesized prints only its inner expression, without the parentheses.
• The ArrowFunction arm adds (...) only when the whole body is an object literal (LiteralMap, after unwrapping one Parenthesized). A body like ReadProp(Parenthesized(LiteralMap)) starts with { but gets no parentheses.

Related: #43 (closed) fixed the plain () => ({...}) case. Open PR #498 extends the same check to raw-source objects but still only checks the whole body, so it doesn't fix this.

On main?

Yes.

Direction

Add parentheses when the leftmost token of the body would be {: walk receivers of member access, calls, binary operators and so on. Or have Parenthesized keep its parentheses whenever the inner expression is an object literal.