todo

status-interfaces_middleware_project.js

app.use(async (ctx, next) => {
  try {
    await next()
    ctx.body = normalizeInterface(ctx)
  } catch (err) {
    ctx.body = normalizeInterface(ctx, err)
  }
})

app.use(async (ctx) => {
  // Throw a multi error
  if (stuff) {
    throw new MultiError('Shit dawg')
      .add('MYAPP_001', 'Email in use')
      .add('MYAPP_002', 'Username in use')
  }
})

// Required to extend an error.
const ExtendableError = require('es6-error')
class MultiError extends ExtendableError {
  errors = []

  add (code, text) {
    this.errors.push({ code, text })
    return this
  }
}

function normalizeInterface (ctx, err) {
  if (err && err instanceof MultiError) {
    return {
      status_code: ctx.status,
      error_details: err.errors
    }
  }

  return {
    status_code: ctx.status,
    content: ctx.body
  }
}