@spree/storefront-api-v2-sdk/src/helpers/auth.ts

Node module to easily integrate your JavaScript or TypeScript application with Spree API V2. You can create an entirely custom Storefront in JS/TS with this package including one page checkout, Single Page Apps, PWAs and so on

export const authParams = ({ username, password }) => ({
  username,
  password,
  grant_type: 'password'
})

export const refreshParams = ({ refresh_token }) => ({
  refresh_token,
  grant_type: 'refresh_token'
})