sanity/src/_internal/cli/commands/migration/templates/minimalAdvanced.ts

Sanity is a real-time content infrastructure with a scalable, hosted backend featuring a Graph Oriented Query Language (GROQ), asset pipelines and fast edge caches

export const minimalAdvanced = ({
  migrationName,
  documentTypes,
}: {
  migrationName: string
  documentTypes: string[]
}) => `import {defineMigration, patch, at, setIfMissing} from 'sanity/migrate'

/**
 * this migration will set \`Default title\` on all documents that are missing a title
 * and make \`true\` the default value for the \`enabled\` field
 */
export default defineMigration({
  title: '${migrationName}',
${
  documentTypes.length > 0
    ? `  documentTypes: [${documentTypes.map((t) => JSON.stringify(t)).join(', ')}],\n`
    : ''
}
  async *migrate(documents, context) {
    for await (const document of documents()) {
      yield patch(document._id, [
        at('title', setIfMissing('Default title')),
        at('enabled', setIfMissing(true)),
      ])
    }
  }
})
`