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

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评估

难度
3/5
预计耗时
1-2 天
新手友好度
78/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
angular, rust
领域
compilers

调研方向

Start in crates/oxc_angular_compiler/src/output/emitter.rs around the main lines ~742 and ~766, focusing on OutputExpression::Parenthesized and the ArrowFunction arm. Trace how nested member-access, call, or other receivers are emitted, then verify that an object literal at the body's leftmost token retains parentheses and produces valid JavaScript for the supplied reproductions.

由索引模型根据 Issue 内容生成。

描述

bug

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.

主要语言
Rust
星标
232
派生
21
平均合并
1 天 16 小时
30 天内合并 PR
62

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从这里开始

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  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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