Cannot find module 'worker_threads'

When I run npm run build, I get below error

> @ build /Users/ajayposhak/Projects/foo
> wmr build --prerender

internal/modules/cjs/loader.js:638
    throw err;
    ^

Error: Cannot find module 'worker_threads'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
    at Function.Module._load (internal/modules/cjs/loader.js:562:25)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (/Users/ajayposhak/Projects/foo/node_modules/wmr/wmr.cjs:2:266)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @ build: `wmr build --prerender`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the @ build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/ajayposhak/.npm/_logs/2020-12-03T08_39_59_702Z-debug.log

Node version is v10.16.3, so I think minimum required version to use wmr should be node v15.

[AjayPoshak]

It goes away when I upgrade my node to version 15. I think it would be great to mention this in documentation and/or have a engines field in package.json. I’ll be happy to open a PR for this.

[lukeed]

Ah. Well 12 has the same ESM impl as 14. You probably ran into issues with the 13.0-13.7 range, which has borked exports map support