6xgate / vahvista Goto Github PK

In addition to the currently implemented simple chainable validation framework, a more structured version modeled after ow is desired. This will allow more use-cases with vahvista such as function argument and object schema validation.

This will require exposing the two frameworks as different namespaces in a breaking change:
import { simple: v } from "vahvista"; or
import { structured: v } from "vahvista";

v.dict(v.shape) should result in Predicate<{ [key: string]: string }>, but do not

Add support for registering failure messages with rules. This will be used to support added assertive validation functionality, throwing an error if validation fails. v.assert({ value }, v.string.notEmpty);

Lodash currently power many rules in vahvista. This helped to make the first release quick, but lodash performs more check than vahvista should per rule. Vahvista simple rules should only check the basic concept its designed for. This is the case for many reasons.

1. Vahvista was original designed for use in Vue.js property validators which already perform many of the same checks when using the type property as certain lodash functions do.
2. The rules like notEmpty or lowerCase are meant to be used after the type is already confirmed to be a string, per point 1.
3. These rules will likely be re-used in a future structured validation framework that will be added to vahvista modeled after ow, which will require any necessary type checks to be performed by other rules before any given rule is used.

Some that will result in
PredicateType = Predicate<infer T> ==> T

To better utilize these predicates, have them resolve to literal types