Improve the TypeScript types

I think the types could still be improved.

• Would be good to use unknown instead of any here: https://github.com/sindresorhus/conf/blob/bb24cfe32d39617a4b3983a92bd81596bd87c312/index.d.ts#L210 But it causes error on a valid usage:

  index.test-d.ts:123:13
    ✖  123:13  Argument of type "debug phase" is not assignable to parameter of type never.
  

• You cannot use dot-paths with a typed store: config.set('foo.bar', true);. We need to find a way to support that. Could possibly add support for config.set(['foo', 'bar'], true).
• Reduce duplication if you use both a typed store and the defaults option. Maybe using the const keyword.
• Could we make the types even stricter?
• Expose the type of the schema option, so it’s easier to define it as a variable before passing it. Currently, you would have to do const schema = {[Key in keyof TypedStore]: Conf.Schema} = {…};. https://github.com/sindresorhus/conf/blob/bb24cfe32d39617a4b3983a92bd81596bd87c312/index.d.ts#L50
• Maybe rename the current Schema type to something clearer like SchemaValue, SchemaOptionValue? Need some naming suggestions.

I’m open to other ideas on how to improve the types.

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Submitted pull Requests

• #96 refactor: change source code to typescript
• #104 Refactor/typescript

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[sindresorhus]

For anyone that wants to work on this, see the initial attempt and feedback in https://github.com/sindresorhus/conf/pull/96. You can start from there.