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setFieldValue triggers an infinite loop inside VUE watchEffect #1726

@MakhBeth

Description

@MakhBeth

Describe the bug

After updating "@tanstack/vue-form" from 1.2.4 to 1.19.5, watchEffects used to update other values via setFieldValue triggers an infinite loop.
Here is a reproduction: https://stackblitz.com/edit/vitejs-vite-9fd8xe5a?file=src%2FApp.vue&terminal=dev
You should input 1 and blur the first input to trigger it (with the console opened, you will have debuggers, so your tab will not explode from the infinite loop)

Some discoveries:
Putting { dontValudate: true } to the setFieldValue options solves the issue
Also using a watch instead of a watchEffect works as workaround, even watching the setFieldValue

watch(() => [store.value, form.setFieldValue], ([v, setFieldValue]) => {
  console.log("store", v)
  if (v['first'] === "1") {
    setFieldValue('second', '2')
  }
}, {onTrack(e) {
    debugger
  },
  onTrigger(e) {
    debugger
  },
})

Your minimal, reproducible example

https://stackblitz.com/edit/vitejs-vite-9fd8xe5a?file=src%2FApp.vue&terminal=dev

Steps to reproduce

You should input 1 and blur the first input to trigger it (with the console opened, you will have debuggers, so your tab will not explode from the infinite loop)

Expected behavior

As a user, I expected the watchEffect to trigger once, instead of causing an infinite loop

How often does this bug happen?

Every time

Screenshots or Videos

No response

Platform

  • OS: Mac OS 15.5
  • Browsers: Chrome 139.0.7258.157, Safari

TanStack Form adapter

None

TanStack Form version

1.19.5

TypeScript version

11.5.1

Additional context

No response

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