validlyjs/dist/rules/conditional/RequiredIf.js

ValidlyJS is a lightweight, type-safe validation library inspired by Laravel's validation syntax

import { requiredRule } from "../common/Required.js";
export const requiredIfRule = {
    validate: (value, params, ctx) => {
        const [otherField, expectedValue] = params;
        const otherValue = ctx.data[otherField];
        if (otherValue == expectedValue) {
            return requiredRule.validate(value, [], ctx); // Reuse the requiredRule validation
        }
        return true;
    },
    message: (params, ctx) => {
        const [otherField, expectedValue] = params;
        const customMessage = ctx.config.messages.required_if;
        if (typeof customMessage === "string") {
            // Replace placeholders if a custom message is provided
            return customMessage
                .replace(":other", otherField)
                .replace(":value", expectedValue);
        }
        // Fallback to default message
        return `${ctx.field} is required when ${otherField} is ${expectedValue}`;
    },
};
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