rapassata

Helps to validate anything against a created schema.

import { shape, validator, type } from 'rapassata';

// 1. Define a validation schema using helper functions
//  and validators
const validate = shape(
    {
        email: validator('isEmail').required(),
        address: shape(
            {
                street: type.string(),
                postalCode: type.number(),
            }
        ).required(),
    }
);

// 2. Validate input data
validate({ address: { postalCode: '301' } })
// 3. Retreive the Promised result
    .then(result =>
// {
//   "valid": false,
//   "message": {
//     "email": [
//       "Value is required"
//     ],
//     "address": {
//       "postalCode": [
//         "Value is not valid"
//       ]
//     }
//   },
//   "subject": {
//     "address": {
//       "postalCode": "301"
//     }
//   }
// }

Assertion creators

Assertion is a function, accepting any subject item and decides whether the passsed value is valid and the message that should be passed along if its not.

• array(itemAssertion: Assertion): Assertion. Creates an assertion, where each item of the collection is matched against the itemAssertion definition.
• shape(shapeSchema): Assertion. Creates an assertion for a generic object. Schema should be defined as { [key: string]: Assertion }.
• type.string(): Assertion, type.boolean(), type.number() create an assertion that matches the subject with typeof operator.
• validator(name, args): Assertion. Creates an assertion based on validator package. Subject is automatically cast to string, as validator package does throw an error otherwise.
• custom(fn, msg): Assertion can be used to create an assertion from a custom function, that accepts the subject and responds/resolves with true/false.
• and(...assertions): Assertion. Composes an assertion of many assertions. Each assertion is called sequentially, first to fail fails the composed assertion. Does not work with shape an array assertions.

Required

Most assertions have a .required() method to make the value required.

By default, null and undefined are considered empty for required fields.