allow usage with typescript 4.5 beta

[SimonSiefke]

Desired Behavior

It would be nice to use ts-node with typescript 4.5 beta

Is this request related to a problem?

Yes: When installing typescript 4.5 beta and ts-node, npm shows an error that ts-node doesn't support typescript 4.5 beta:

simon (main #) ts-node-typescript-4.5 $ npm i -D typescript@beta ts-node
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: [email protected]
npm ERR! Found: [email protected]
npm ERR! node_modules/typescript
npm ERR!   dev typescript@"4.5.0-beta" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer typescript@">=2.7" from [email protected]
npm ERR! node_modules/ts-node
npm ERR!   dev ts-node@"*" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR! 
npm ERR! See /home/simon/.npm/eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/simon/.npm/_logs/2021-10-17T07_09_56_454Z-debug.log

Alternatives you've considered

Additional context

[cspotcode]

We actually run our test suite against typescript nightly builds. I'm guessing that the error you're seeing here is erroneously raised by a package manager.

Here is a link to our package.json file:
https://unpkg.com/[email protected]/package.json

Do you see anything in there that would be causing the error that you are seeing?

[SimonSiefke]

You're right, it seems to be related to npm: I've found npm/npm#8854: Version comparators exclude rc releases:

4.5.0-beta (unexpectedly) just doesn't satisify >=2.7

[cspotcode]

Ok, thanks for sharing your research.

For what it's worth, we could possibly change our peerDependencies declaration if it would help you. But I always assume that npm v7 will "do the right thing" as far as auto-installing peerDependencies, so we would want to ensure we do not break that behavior.

Based on reading sindresorhus/ow#225, it sounds like you're ok with waiting till typescript 4.5 is stable.