fix: Add optional typescript peerDependency to apollo-composable package

[jnoordsij]

Fixes #1499

[nickmessing]

@jnoordsij, This is probably not the correct fix. This project can and is used by some people with plain JS. We should not add typescript as a peerDependency

[jnoordsij]

Hey there, thanks for checking this! I do think this is the correct fix for this case, given

• ts-essentials is listed as a (hard) dependency, although this is also only required for those using TypeScript
• given that ts-essentials requires a (very broad but technically speaking still a) specific range of TypeScript versions and lists this as peerDependency, it is up to this package to fulfill that in some way
• by explicitly marking it here as an optional peerDependency, it is up to the end-user to decide on wether or not to use TypeScript, therefore not adding an additional package (even though ts-essentials still is added)

The only alternative I see is moving ts-essentials to be an optional peerDependency, but I think that is more breaking and invasive to end-users, given that it is harder to realise that they should be providing that in case they are using TypeScript, compared to them installing typescript when they want to use TypeScript.

[nickmessing]

@jnoordsij, oh, didn't realise that ts-essentials is a dependency O_O.

@Akryum wdyt on this?

[jnoordsij]

As ts-essentials now has its typescript dependency marked as optional (see ts-essentials/ts-essentials#371), this is no longer required to fix the issue. One may opt to still add this as some possibly useful metadata, although maybe having it at ts-essentials and leaving it there suffices. So feel free to close this if there's no time or reason to review/merge this further.