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Angular Runtime NG0600: Writing to signals is not allowed introduced by (1085)

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@okxint 已经在做这个了。

开始于 2026年10月1日。

  • #1109 来自 @Stallion8472 —— 已关闭，未合并
  • #1295 来自 @okxint —— 未关闭

评估

难度
4/5
预计耗时
3-5 天
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
angular, typescript
领域
frontend

调研方向

首先在链接的 Angular infinite-scroll 示例中重现错误，并检查 tanstack-angular-virtual.mjs 和 index.js 中的堆栈条目。比较 PR 1085 引入的行为，重点关注跟踪中显示的 notify 和 computed-value 路径。当示例在正常的 signal 求值期间不再抛出 NG0600 时，即表示完成。

由索引模型根据 Issue 内容生成。

描述

Describe the bug

PR 1085 (4.0.1) has introduced the following issue in angular-virtual which is breaking normal behavior:

RuntimeError: NG0600: Writing to signals is not allowed in a computed or an effect by default. Use allowSignalWrites in the CreateEffectOptions to enable this inside effects.

Broadly speaking computed values derived from angular-tanstack signals are now in error since the notify change causes the virtualizer signal to be set. Evaluating the signal values probably should not have this side effect.

eg top of stack sets the virtualizer signal, bottom is a dervied value

**onChange                                           tanstack-angula...irtual.mjs:111**
**Virtualizer.notify                                 index.js:267**
**onChange                                           index.js:414**
memoizedFunction                                   utils.js:42
**Virtualizer.getMeasurements:memo.count.count       index.js:419**
memoizedFunction                                   utils.js:9
**Virtualizer.calculateRange:memo.range.measurements.length.calculateRange.meas...**
                                                   index.js:504
memoizedFunction                                   utils.js:9
**Virtualizer.getVirtualIndexes.rangeExtractor.startIndex.startIndex**
                                                   index.js:526
memoizedFunction                                   utils.js:9
**Virtualizer.getVirtualItems:virtualItems           index.js:618**
memoizedFunction                                   utils.js:9
(anonymous)                                        tanstack-angula...irtual.mjs:38
producerRecomputeValue                             signal.mjs:468
producerUpdateValueVersion                         signal.mjs:558
**computed2                                          signal.mjs:408**
(anonymous)                                        tanstack-

You can see this error in the console of the live example, though in this case it's originating from an effect (and in recent angular version setting signal inside an effect is legal).

Infinite scroll angular example

Your minimal, reproducible example

https://tanstack.com/virtual/latest/docs/framework/angular/examples/infinite-scroll

Steps to reproduce

Load example, examine console

Expected behavior

Error should not be thrown

How often does this bug happen?

None

Screenshots or Videos

No response

Platform

Angular implementations

tanstack-virtual version

4.0.1

TypeScript version

No response

Additional context

No response

Terms & Code of Conduct
  • I agree to follow this project's Code of Conduct
  • I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.
主要语言
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环境准备

从这里开始

  1. 先读完整个 Issue，再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  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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