sfl-validator
0.1.0

dependency-free single-file library for schema validation with support for static type inference and custom error messages.


USAGE
    import { Validator, Infer } from './validator.ts';

    const v = new Validator();

    const Address = v.object({
        street: v.string(),
        city:   v.string(),
    });

    const Profile = v.object({
        username: v.string({ min: 3 }, { min: 'Username too short' }),
        age:      v.optional(v.number()),
        address:  v.nullable(Address),
        tags:     v.array(v.string(), { min: 1, max: 5 }),
    });

    const new_profile: Infer<typeof Profile> = {
        username: 'ale',
        address:  { street: 'ABC', city: 'DEF' },
        tags:     ['abc', 'def'],
    }

    const result = Profile.validate(new_profile);