commerce/framework/vendure/lib/mutations/log-in-mutation.ts

export const loginMutation = /* GraphQL */ `
  mutation login($username: String!, $password: String!) {
    login(username: $username, password: $password) {
      __typename
      ... on CurrentUser {
        id
      }
      ... on ErrorResult {
        errorCode
        message
      }
    }
  }
`