javascript - Koa inexplicably reports ctx.onerror is not a function. What is the situation?

Question

Whenever I open safiri locally, the local koa project will crash. I don’t know what’s going on. .

Listening on:8000
/Users/lmn/project/u-pain-i-guess/node_modules/koa/lib/application.js:133
      const onerror = err => ctx.onerror(err);
                                 ^

TypeError: ctx.onerror is not a function
    at Array.onerror (/Users/lmn/project/u-pain-i-guess/node_modules/koa/lib/application.js:133:34)
    at listener (/Users/lmn/project/u-pain-i-guess/node_modules/on-finished/index.js:169:15)
    at onFinish (/Users/lmn/project/u-pain-i-guess/node_modules/on-finished/index.js:100:5)
    at callback (/Users/lmn/project/u-pain-i-guess/node_modules/ee-first/index.js:55:10)
    at ServerResponse.onevent (/Users/lmn/project/u-pain-i-guess/node_modules/ee-first/index.js:93:5)
    at emitNone (events.js:91:20)
    at ServerResponse.emit (events.js:188:7)
    at onFinish (_http_outgoing.js:592:10)
    at _combinedTickCallback (internal/process/next_tick.js:73:7)
    at process._tickCallback (internal/process/next_tick.js:104:9)

The above string is the error message, server listen is on port 8000
I tried to add it in the code

app
  .use(bodyParser)
  .use(router.routes())
  .use(router.allowedMethods())
  .on('error', console.error)

app.onerror = console.error

Still like this. .
Please give me a big answer.

Answer 1

You should take out the code in app.js and take a look, otherwise no one will be able to directly locate the problem. If you get an error like this, it may be that some logic in the middle has rewritten app.context.