static-convert-path.ts

static-convert-path.ts

type ToPathIndexArray<S extends string> = 
    S extends `${infer N}[${infer P}]` ? [N, P] : [S];

type ToPathArray<P extends string, _R extends string[] = []> = 
    P extends `${infer NS}.${infer N}`
        ? NS extends `${infer IN}[${infer I}]`
            ? [IN, I, ...ToPathArray<N>, ..._R]
            : [...ToPathIndexArray<NS>, ...ToPathArray<N>, ..._R]
        : P extends `${infer IN}[${infer I}]`
            ? [IN, I, ..._R]
            :  P extends '['
                ? never
                : [P, ..._R]

type T3 = ToPathIndexArray<'a'>
type T2 = ToPathArray<'a[1].x.b[1]'>