UnhandledPromiseRejectionWarning: TypeError: proc.send is not a function

[faizanalhassan]

Hi there, I just recently started using bullmq. During development, if there is any syntax error left in the script, instead of showing me the exact line from where the error was generated, program always shows me:

UnhandledPromiseRejectionWarning: TypeError: proc.send is not a function
    at C:\repos\tracking-engine\api\node_modules\bullmq\src\utils.ts:146:10
    at new Promise (<anonymous>)
    at Object.exports.asyncSend (C:\repos\tracking-engine\api\node_modules\bullmq\src\utils.ts:145:10)
    at Object.exports.childSend (C:\repos\tracking-engine\api\node_modules\bullmq\src\utils.ts:159:21)
    at process.<anonymous> (C:\repos\tracking-engine\api\node_modules\bullmq\src\classes\master.ts:32:9)
    at process.emit (events.js:327:22)
    at process.EventEmitter.emit (domain.js:467:12)
    at process._fatalException (internal/process/execution.js:163:25)

I have seen another similar issue #1120, but it was closed with the report that the issue is resolved in version 1.76.2, however, my version is 1.76.3 but still facing the error.
For example there was a typo (I wrote Joi.Array() instead of Joi.array()) that crashed the program, the program was not showing the error cause. Then I commented a thell imports for bullmq and then running the program showed me the exact line initiating the error.

[roggervalf]

hi @faizanalhassan could you please provide us a test case to reproduce this issue?

[faizanalhassan]

This is an example with syntax error:

import { Queue, Worker, QueueScheduler } from "bullmq";

let x = 1
x()  // <--- this is the error

And error comes:

UnhandledPromiseRejectionWarning: TypeError: proc.send is not a function
    at C:\repos\tracking-engine\api\node_modules\bullmq\src\utils.ts:146:10
    at new Promise (<anonymous>)
    at Object.exports.asyncSend (C:\repos\tracking-engine\api\node_modules\bullmq\src\utils.ts:145:10)
    at Object.exports.childSend (C:\repos\tracking-engine\api\node_modules\bullmq\src\utils.ts:159:21)
    at process.<anonymous> (C:\repos\tracking-engine\api\node_modules\bullmq\src\classes\master.ts:32:9)
    at process.emit (events.js:315:20)
    at process._fatalException (internal/process/execution.js:163:25)

If we comment out the imports:

// import { Queue, Worker, QueueScheduler } from "bullmq";

let x = 1
x()  // <--- this is the error

then error is correct:

TypeError: x is not a function
    at Object.x (C:\repos\tracking-engine\api/error.js:4:1)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Module._compile (C:\repos\tracking-engine\api\node_modules\pirates\lib\index.js:99:24)
    at Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Object.newLoader [as .js] (C:\repos\tracking-engine\api\node_modules\pirates\lib\index.js:104:7)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (internal/modules/cjs/helpers.js:88:18)
    at Object.<anonymous> (C:\repos\tracking-engine\api\worker.js:4:18)

[roggervalf]

@faizanalhassan last version should have a tentative fix, I couldn't reproduce it, but hopes it works for you. Feel free to reopen this issue if you still see it