Cannot find name 'unknown'.

[symis84]

platform: win10

ERROR in node_modules/type-fest/index.d.ts(20,23): error TS2304: Cannot find name 'unknown'.
node_modules/type-fest/index.d.ts(61,30): error TS2304: Cannot find name 'unknown'.
node_modules/type-fest/source/package-json.d.ts(60,28): error TS2304: Cannot find name 'unknown'.
node_modules/type-fest/source/package-json.d.ts(375,24): error TS2304: Cannot find name 'unknown'.
node_modules/type-fest/source/package-json.d.ts(486,21): error TS2304: Cannot find name 'unknown'.
node_modules/type-fest/source/package-json.d.ts(493,17): error TS2304: Cannot find name 'unknown'.

[CvX]

Type-fest uses the unknown type introduced in TypeScript 3.0. What's your TS version?

I wonder if there's a way to show a nicer error explaining which TS version is required at a minimum?

[BendingBender]

I don't think that this library will work for TS < 3.2 becase we now use bigint primitive type that was introduced in TS 3.2.

[symis84]

@angular/[email protected] requires typescript@'>=2.7.2 <2.10' but 3.4.5 was found instead.
Using this version can result in undefined behaviour and difficult to debug problems.

Please run the following command to install a compatible version of TypeScript.

npm install typescript@">=2.7.2 <2.10"

To disable this warning run "ng config cli.warnings.typescriptMismatch false".

Basically, i need to update my Angular project to the latest Angular 7 if i want to use this library

[sindresorhus]

@BendingBender I think we add typescript as a peer dependency. That way we can make it clear what typescript version we support. Thoughts?

[BendingBender]

Sounds good to me. Let's try this out.

[CvX]

My experiences with peer dependencies range from "doesn't work at all" to "gives a bunch of invalid warnings" 😉 but at the very least it will document minimal TS version in the package.json, so that's a win. 😄

[sindresorhus]

Actually, this was a bad idea. It means it now complains about TypeScript in a non-TS project that uses type-fest just for the index.d.ts.