Error due to inconsistent code between Typescript nightly 4.2.0-dev.20210106 and @types/[email protected]

[Luxcium]

Bug Report

🕗 Version & Regression Information

Version 4.2.0-dev.20210106 and Version 4.2.0-dev.20210105

⏯ Playground Link

👨‍💻 actual tsconfig.json

Link with relevant actual tsconfig.json

💻 Code

🙁

code --install-extension ms-vscode.vscode-typescript-next
fnm default 15
fnm use default
yarn add -D typescript@next @types/[email protected]
npm -g i typescript@next
yarn global add typescript@next
npm install -g npm@7
yarn global add yarn@latest
yarn global add npm@7
tsc --version
node --version
npm --version
tsc

🙂

code --uninstall-extension ms-vscode.vscode-typescript-next
fnm default 14
fnm use 14
yarn add typescript@latest @types/[email protected]
npm -g i typescript@latest
yarn global add typescript@latest
npm install -g npm@latest
yarn global add yarn@latest
yarn global add npm@latest
tsc --version
node --version
npm --version
tsc

🙁 Actual behavior

when using tsc --version; node --version
tsc: Version 4.2.0-dev.20210106
node: v14.15.4

when using tsc --version; node --version
tsc: Version 4.2.0-dev.20210106
node: v15.5.1

🙂 Expected behavior

on the left Expected behavior on the right Actual behavior:

[Luxcium]

the breadcrumbs on top show the location in my system

[Luxcium]

This one is line 30 in the related clone of the Definitelytyped node package... I sent them a PR [#50431] about this issue [#42229]

[andrewbranch]

The lib changes were reverted in #42230; DefinitelyTyped CI is clean today. Thanks!