react server action zod validation

index.ts

import { z } from "zod";
import { fromZodError } from "zod-validation-error";

export function procedure<TSchema extends z.ZodTypeAny = z.ZodNever>(inputSchema?: TSchema) {
    type InputArgs = TSchema extends z.ZodNever ? [] : [z.output<TSchema>]
    type TransformedArgs = TSchema extends z.ZodNever ? [] : [z.input<TSchema>]

    return {
        // eslint-disable-next-line no-unused-vars
        do<TOutput>(fn: (...input: InputArgs) => TOutput) {
            return (...input: TransformedArgs) => {
                if (inputSchema) {
                    const result = inputSchema.safeParse(input[0])
                    if (!result.success) {
                        throw fromZodError(result.error)
                    }
                    return fn(...[result.data] as InputArgs)
                }
                return fn(...[input[0]] as InputArgs)
            }
        }
    }
}

export function paginationSchema<TCursor extends z.ZodTypeAny = z.ZodNever>(cursorSchema: TCursor) {
    return z.object({
        before: cursorSchema,
        after: cursorSchema,
    }).partial();
}