esbuild 0.12.12 Cannot be used in custom multi thread app.

[rizrmd]

When running esbuild 0.12.12 as a child worker, esbuild throw this:

node:internal/event_target:641
  process.nextTick(() => { throw err; });
                           ^
TypeError [Error]: Cannot read property 'workerPort' of undefined
    at startSyncServiceWorker (/Users/riz/Documents/base/node_modules/esbuild/lib/main.js:1888:46)
    at Object.<anonymous> (/Users/riz/Documents/base/node_modules/esbuild/lib/main.js:1924:3)
    at Module._compile (node:internal/modules/cjs/loader:1095:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1124:10)
    at Module.load (node:internal/modules/cjs/loader:975:32)
    at Function.Module._load (node:internal/modules/cjs/loader:816:12)
    at Module.require (node:internal/modules/cjs/loader:999:19)
    at require (node:internal/modules/cjs/helpers:93:18)
    at Object.<anonymous> (/Users/riz/Documents/base/pkgs/builder/build/index.js:37:33)
    at Module._compile (node:internal/modules/cjs/loader:1095:14)
Emitted 'error' event on Thread instance at:
    at Thread.[kOnErrorMessage] (node:internal/worker:298:10)
    at Thread.[kOnMessage] (node:internal/worker:309:37)
    at MessagePort.<anonymous> (node:internal/worker:210:57)
    at MessagePort.[nodejs.internal.kHybridDispatch] (node:internal/event_target:461:20)
    at MessagePort.exports.emitMessage (node:internal/per_context/messageport:23:28)

esbuild 0.12.9 works fine, it shows error only when I update to 0.12.12.

I can workaround this error by disabling worker thread optimization.
By changing node_modules/esbuild/lib/main.js:1923 into this:

if (false && worker_threads && !worker_threads.isMainThread) {
  startSyncServiceWorker();
}

And esbuild is humming again.

[evanw]

You can disable it by either using an earlier version of esbuild or by setting the environment variable ESBUILD_WORKER_THREADS=0 before running esbuild. I can't look at this right now but may have time to look at this later today.