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JSX preserve mode spreads an `@unboxed` props record (`{..."x"}` instead of `"x"`)

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维护者通常 1 天内回复

已经有一个关联 PR 被合并了。

  • #8847 来自 @cknitt —— 已关闭,未合并
  • #8857 来自 @cknitt —— 已合并

评估

难度
4/5
预计耗时
1-2 天
新手友好度
25/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
停滞
技术栈
javascript, ocaml
领域
compilers

调研方向

Start with jsx_props_of in compiler/ml/translcore.ml and jsx_printable in compiler/core/js_dump.ml, then compare the preserve-mode output with the reproduction and expected output in the issue. Done means both @unboxed record examples preserve the string as the props value instead of spreading it. Pull request #8847 is already open for this issue.

由索引模型根据 Issue 内容生成。

描述

Found by adversarial experiments on semantic analysts.

What is broken

jsx_props_of turns every props expression that is not a Record_regular record literal into Jsx_props_spread:
https://github.com/rescript-lang/rescript/blob/8d51b9ce7/compiler/ml/translcore.ml#L1049-L1096

An @unboxed record literal compiles to its single field's value, which is not an object. jsx_printable does not reject this case:
https://github.com/rescript-lang/rescript/blob/8d51b9ce7/compiler/core/js_dump.ml#L176-L190

Reproduction

@@jsxConfig({version: 4, module_: "MyJsx"})
module MyJsx = {
  type element = int
  type component<'props> = 'props => element
  external component: component<'props> => component<'props> = "%identity"
  @module("rt") external jsx: (component<'props>, 'props) => element = "jsx"
  @module("rt") external jsxs: (component<'props>, 'props) => element = "jsxs"
  external array: array<element> => element = "%identity"
}
@unboxed type props = {title: string}
module C = {@module("lib") external make: MyJsx.component<props> = "C"}
module D = {@val external make: MyJsx.component<props> = "lowerD"}
let el = <C title="x" />
let el2 = <D title="y" />

bsc -nopervasives -bs-jsx 4 -bs-jsx-preserve K12.res at master:

let el = <Lib.C
  {..."x"}
/>;
let el2 = Rt.jsx(lowerD, {..."y"});

Expected, as printed by bsc -nopervasives -bs-jsx 4 and by preserve mode at ece8b148:

let el = Rt.jsx(Lib.C, "x");
let el2 = Rt.jsx(lowerD, "y");

Introduced

#8754 (a7721303a).

Impact

The component receives {0: "x"} instead of "x": the generated code is wrong, with no error or warning. The case is rare, because the props type must be an @unboxed record.

主要语言
OCaml
星标
7.5k
派生
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平均合并
20 小时 27 分钟
30 天内合并 PR
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