diffing.ts

import * as jsondiffpatch from 'jsondiffpatch'
import { set, unset } from 'es-toolkit/compat'
import microdiff from 'microdiff'

/** Merges by using `microdiff` */
export function diffMerge(
  prev: object,
  next: object,
  method: true | 'microdiff' | 'jsondiffpatch' = true,
) {
  switch (method) {
    case true:

    case 'microdiff': {
      const diff = microdiff(prev, next)

      for (const event of diff) {
        switch (event.type) {
          case 'CREATE':
          case 'CHANGE':
            set(prev, event.path, event.value)
            break
          case 'REMOVE':
            unset(prev, event.path)
            break
        }
      }
    }

    case 'jsondiffpatch': {
      const diff = jsondiffpatch.diff(prev, next)

      jsondiffpatch.patch(prev, diff)
    }
  }
}