Cannot find name DedicatedWorkerGlobalScope

[F3n67u]

I tried implement worker_threads.isMainThread via DedicatedWorkerGlobalScope, but deno complain cannot find name DedicatedWorkerGlobalScope ;

// test.ts
const isMainThread = typeof DedicatedWorkerGlobalScope === "undefined" ||
  self instanceof DedicatedWorkerGlobalScope === false;
console.log(isMainThread);

% deno run test.ts 
Check file:///Users/feng/dev/deno/test-ts/test.ts
error: TS2304 [ERROR]: Cannot find name 'DedicatedWorkerGlobalScope'.
const isMainThread = typeof DedicatedWorkerGlobalScope === "undefined" ||
                            ~~~~~~~~~~~~~~~~~~~~~~~~~~
    at file:///Users/feng/dev/deno/test-ts/test.ts:1:29

TS2304 [ERROR]: Cannot find name 'DedicatedWorkerGlobalScope'.
  self instanceof DedicatedWorkerGlobalScope === false;
                  ~~~~~~~~~~~~~~~~~~~~~~~~~~
    at file:///Users/feng/dev/deno/test-ts/test.ts:2:19

Found 2 errors.

[nayeemrmn]

You should just // @ts-ignore that line. That symbol is only defined within workers so if you're using it to check if you're in a worker you'll have to bypass type-checking.

[bartlomieju]

@F3n67u FYI there's already an open PR to add worker_threads that is feature-complete: denoland/std#1151 but we still haven't landed it due to type checking issues. I suggest not to duplicate the work and maybe instead try to figure out the type checking problems in aforementioned PR?

[F3n67u]

@F3n67u FYI there's already an open PR to add worker_threads that is feature-complete: denoland/deno_std#1151 but we still haven't landed it due to type checking issues. I suggest not to duplicate the work and maybe instead try to figure out the type checking problems in aforementioned PR?

@bartlomieju ok, thanks for your information. I will set isMainThread as true when it's used in the node test now. It's ok when the node test is not related to worker.