useSettingsChange.ts

hooks/useSettingsChange.ts

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Expert explanation

Architecturally, this file intersects with general runtime concerns. It contains 26 lines, 5 detected imports, and 1 detected exports.

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Detected exports

useSettingsChange

Keywords

settingsutilssettingsourceonchangesourcehandlechangeusecallbackuseeffectsettingschangedetectorchangedetector

Detected imports

react
../utils/settings/changeDetector.js
../utils/settings/constants.js
../utils/settings/settings.js
../utils/settings/types.js

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Full source

import { useCallback, useEffect } from 'react'
import { settingsChangeDetector } from '../utils/settings/changeDetector.js'
import type { SettingSource } from '../utils/settings/constants.js'
import { getSettings_DEPRECATED } from '../utils/settings/settings.js'
import type { SettingsJson } from '../utils/settings/types.js'

export function useSettingsChange(
  onChange: (source: SettingSource, settings: SettingsJson) => void,
): void {
  const handleChange = useCallback(
    (source: SettingSource) => {
      // Cache is already reset by the notifier (changeDetector.fanOut) —
      // resetting here caused N-way thrashing with N subscribers: each
      // cleared the cache, re-read from disk, then the next cleared again.
      const newSettings = getSettings_DEPRECATED()
      onChange(source, newSettings)
    },
    [onChange],
  )

  useEffect(
    () => settingsChangeDetector.subscribe(handleChange),
    [handleChange],
  )
}