typescript属性'type'在'never'类型上不存在

Question

I have the typescript error typescript Property 'type' does not exist on type 'never' in the code

export const getSomething = (actionLog: [] | undefined) => {
  console.info(actionLog[length - 1].type)
}

What is the issue?

Answer 1

The solution is to define type for 'type' property:

export const getSomething = (actionLog: {type: string}[] | undefined) => {
  console.info(actionLog[length - 1].type)
}

UPDATED:

export const getSomething = (actionLog: {type: string}[]) => {
  if (actionLog && actionLog[0]) {
    console.info(actionLog[length - 1].type)
  }
}