How to use the @commercetools/get-credentials.getCredentials function in @commercetools/get-credentials

const setupProject = async () => {
      const credentials = await getCredentials(projectKey)
      apiConfig = {
        host: 'https://auth.sphere.io',
        apiUrl: 'https://api.sphere.io',
        projectKey,
        credentials,
      }
      // Clear all existing data
      await Promise.all([
        clearData(apiConfig, 'customers'),
        clearData(apiConfig, 'orders'),
        clearData(apiConfig, 'carts'),
        clearData(apiConfig, 'payments'),
        clearData(apiConfig, 'shoppingLists'),
        clearData(apiConfig, 'reviews'),
      ])

beforeAll(async () => {
      const credentials = await getCredentials(projectKey)
      apiConfig = {
        host: 'https://auth.sphere.io',
        apiUrl: 'https://api.sphere.io',
        projectKey,
        credentials,
      }
      await clearData(apiConfig, 'products')

      await Promise.all([
        clearData(apiConfig, 'productTypes'),
        clearData(apiConfig, 'taxCategories'),
      ])

      const createdProductType = await createData(apiConfig, 'productTypes', [
        sampleProductType,
      ])

const resolveCredentials = _args => {
  if (_args.accessToken) return Promise.resolve({})
  return getCredentials(_args.projectKey)
}

const resolveCredentials = _args => {
  if (_args.accessToken) return Promise.resolve({})
  return getCredentials(_args.projectKey)
}

const resolveCredentials = _args => {
  if (_args.accessToken) return Promise.resolve({})
  return getCredentials(_args.projectKey)
}

const resolveCredentials = _args => {
  if (_args.accessToken) return Promise.resolve({})
  return getCredentials(_args.projectKey)
}

const resolveCredentials = _args => {
  if (_args.accessToken) return Promise.resolve({})
  return getCredentials(_args.projectKey)
}

const resolveCredentials = _args => {
  if (_args.accessToken) return Promise.resolve({})
  return getCredentials(_args.projectKey)
}

const resolveCredentials = _args => {
  if (_args.accessToken) return Promise.resolve({})
  return getCredentials(_args.projectKey)
}