@sanity/migrate/src/mutations/asserters.ts

Tooling for running data migrations on Sanity.io projects

import {type Operation} from './operations/types.js'
import {type Transaction} from './transaction.js'
import {type Mutation, type NodePatch} from './types.js'

export function isMutation(mutation: unknown): mutation is Mutation {
  return (
    mutation !== null &&
    typeof mutation === 'object' &&
    'type' in mutation &&
    (mutation.type === 'create' ||
      mutation.type === 'createIfNotExists' ||
      mutation.type === 'createOrReplace' ||
      mutation.type === 'patch' ||
      mutation.type === 'delete')
  )
}

export function isTransaction(mutation: unknown): mutation is Transaction {
  return (
    mutation !== null &&
    typeof mutation === 'object' &&
    'type' in mutation &&
    mutation.type === 'transaction'
  )
}

export function isOperation(value: unknown): value is Operation {
  return (
    value !== null &&
    typeof value === 'object' &&
    'type' in value &&
    (value.type === 'set' ||
      value.type === 'unset' ||
      value.type === 'insert' ||
      value.type === 'diffMatchPatch' ||
      value.type === 'dec' ||
      value.type === 'inc' ||
      value.type === 'upsert' ||
      value.type === 'unassign' ||
      value.type === 'truncate' ||
      value.type === 'setIfMissing')
  )
}

export function isNodePatch(change: unknown): change is NodePatch {
  return (
    change !== null &&
    typeof change === 'object' &&
    'path' in change &&
    Array.isArray(change.path) &&
    'op' in change &&
    isOperation(change.op)
  )
}