[RFC] nextcloud/vue eslint plugin rules

[Antreesy]

Based on #939

To be discussed:

• what's worth efforts to be highlighted with eslint
  • ref: deprecations at 9.0.0
• what's worth efforts to be handled with eslint --fix
  • ref: deprecations at 9.0.0 with backward compatibility at 8.x.x
• for each rule find the first release in nextcloud/vue@8.x.x we started to deprecate something for the next branch that's worth linting
  • e.g. deprecated imports -> 8.23.0

References for Vue template traversing:

• https://eslint.vuejs.org/developer-guide/
• https://astexplorer.net/

[ShGKme]

The import was a simple case that RE can handle. In most of the other cases we'd need to develop codemods.
IMO, it isn't worth it on our codebase size.

[susnux]

The import was a simple case that RE can handle. In most of the other cases we'd need to develop codemods.

I think a very common thing that can be handled:

• NcButton:
  • nativeType -> type
  • type -> variant

This is a pain to migrate otherwise 😅

[Antreesy]

Missing checks at the moment (22.09.2025):

• v9.0.0-rc.9
• v8.31.0

Slots

The leading icon slot was changed from #default to #icon in Nc*Field components:
- NcInputField
- NcTextField
- NcPasswordField

NcCounterBubble

• The default slot was removed #5997

Events

Consistent usage of modelValue prop
All input elements were refactored to use the modelValue prop instead of the now removed value / checked prop and emit the update:modelValue event instead of the removed update:checked / update:value / input events.

Affected components:
- Removed `checked` prop and `update:checked` event

• NcActionCheckbox
• NcActionRadio
• NcCheckboxRadioSwitch

• Removed value prop and update:value / input events:
  • The modelValue prop of NcActionRadio is expecting to have type string|number to be compared to value prop.
• The value prop was renamed to modelValue, the update:value or input events were renamed to update:modelValue. This affects the following components:
  • NcActionInput
  • NcActionTextEditable
  • NcColorPicker
  • NcDateTimePicker
  • NcDateTimePickerNative
  • NcInputField
  • NcPasswordField
  • NcRichContenteditable
  • NcSelect
  • NcSelectTags
  • NcSettingsInputText
  • NcSettingsSelectGroup
  • NcTextArea
  • NcTextField
  • NcTimezonePicker

To have a consistent naming for custom event the following events were deprecated
and now are removed in favor of a new consistent event name:

Component |       Old event |       New event

---------------|-----------------|----------------
NcAppContent | resize:list | resizeList
NcRichText | interact:todo | interactTodo

NcAppSidebar

• The closing and opening events were removed.
  They are directly emitted when the sidebar was opened when using v-if
  and also just duplicated the state of the open prop #5606

NcColorPicker

• The deprecated close event was removed in favor of the closed event, this was done for consistent event names.

NcHeaderMenu

• open, close and cancel events were removed in favor of opened and closed events #6429