Type Alias NumericPaths<T, Depth>

NumericPaths: Depth["length"] extends 4
    ? never
    : T extends readonly unknown[]
        ? never
        : T extends Record<string, unknown>
            ? {
                [K in keyof T & string]: NonNullable<T[K]> extends number
                    ? K
                    : NonNullable<T[K]> extends readonly unknown[]
                        ? never
                        : NonNullable<T[K]> extends Record<string, unknown>
                            ? `${K}.${NumericPaths<NonNullable<(...)>, [(...), (...)]>}`
                            : never
            }[keyof T & string]
            : never

NumericPaths<{ x: number; y: number }> // 'x' | 'y'
NumericPaths<{ position: { x: number }; rotation: number }> // 'position.x' | 'rotation'
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