Typescript 2.9 compatibility

[jethrolarson]

Looks like TS 2.9 changed the way keyofworks and now a bunch of errors like the below are showing up:

node_modules/@types/ramda/src/mergeWithKey.d.ts:78:61 - error TS2344: Type 'keyof T' does not satisfy the constraint 'string'.
  Type 'string | number | symbol' is not assignable to type 'string'.
    Type 'number' is not assignable to type 'string'.

[jethrolarson]

https://blogs.msdn.microsoft.com/typescript/2018/05/31/announcing-typescript-2-9/#breaking-changes has the deets.

[treybrisbane]

Ran into this over the weekend; it's stalling our ability to upgrade to TS 2.9 in a few of our microservices 🙁

[strax]

It's possible to use the previous behavior of keyof and get rid of these warnings until typings are updated by adding the following configuration to tsconfig.json:

{
    "compilerOptions": {
        "keyofStringsOnly": true
    }
}

[ikatyang]

It should be possible, unless you used some tuple types. The fixed length tuple is another incompatible part and it couldn't be disabled. I've opened #399 to address these issues but I'm not sure if it addressed all the TS 2.9 issues, at least there's no warning in generated definitions now and tests are passed.

[KiaraGrouwstra]

The fixed length tuple is another incompatible part and it couldn't be disabled.

That one is my fault. You're welcome. :D