`Predefined Input can not be assigned to InputSource` when using with TypeScript < 4.7

[tim3trick]

I just installed magic-regexp via yarn add magic-regexp and tried the first example from https://regexp.dev/getting-started/examples

Typescript does not like it though: Argument of type 'Input<"\\d", never>' is not assignable to parameter of type 'InputSource<string, never>'.

The code can also be simplified even more: const regex = createRegExp(oneOrMore(digit));

I have created a codesandbox for showcasing this: https://codesandbox.io/s/gracious-swartz-3sdfcs

[tim3trick]

Addition: oneOrMore('x') fails with the same when used inside and, i have updated the sandbox: https://codesandbox.io/s/angry-wave-fr0m5s?file=/src/index.ts

Code that fails: createRegExp( oneOrMore('a') .and('.') .and(oneOrMore('b')) )

[danielroe]

You can see it working fine in stackblitz (here). It also works fine for me locally.

Are you getting this locally, or just in codesandbox (which seems to be using TS 4.4)? If so, what is your local TypeScript version?

[tim3trick]

I get this locally with 4.6.3 as well.

[danielroe]

Yes - confirmed. You need features from TS 4.7+; versions below that show this error.

[tim3trick]

Excuse the question, but am I supposed to to something with the ticket?

[danielroe]

@tim3trick No need to do anything. For now you can use a newer version of TypeScript. I'll keep this open until I've had a chance to see whether it's possible to make the features of this library work with earlier versions of TS or whether I should instead mention it in the README.