validlyjs/dist/rules/common/Required.js

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

export const requiredRule = {
    validate: (value) => {
        if (value === undefined || value === null)
            return false;
        if (typeof value === "string" && value.trim() === "")
            return false;
        return true;
    },
    message: (params, ctx) => {
        const message = ctx.config.messages?.required;
        return typeof message === "string"
            ? ctx.formatMessage({ attribute: ctx.field || 'field' }, message)
            : `${ctx.field || 'field'} is required`;
    },
};
export const nullableRule = {
    validate: (value) => value === null || value === undefined,
    message: ([], ctx) => {
        const message = ctx.config.messages?.nullable;
        return typeof message === "string"
            ? message.replace(/:attribute/g, ctx.field || "field")
            : `${ctx.field} can be null or undefined`;
    },
};
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