discord.js/packages/builders/src/interactions/modals/Assertions.ts

import { ComponentType } from 'discord-api-types/v10';
import { z } from 'zod';
import { customIdPredicate } from '../../Assertions.js';

const titlePredicate = z.string().min(1).max(45);

export const modalPredicate = z.object({
	title: titlePredicate,
	custom_id: customIdPredicate,
	components: z
		.object({
			type: z.literal(ComponentType.ActionRow),
			components: z
				.object({ type: z.literal(ComponentType.TextInput) })
				.array()
				.length(1),
		})
		.array()
		.min(1)
		.max(5),
});