strulidator

Declarative validator for complex deep structures.

TODO

At current moment strulidator isn't ready for production. If you want to help me with release please read the first issue.

Reference

type Validator = (value: any) => boolean

type Constraint = (value: any) => ConstraintResult

type ConstraintResult = {
  valid: boolean,
  message: string | void,
  children: ConstraintResultMap | ConstraintResultArray | void
}

type ConstraintResultMap = {
  [key: string]: ConstraintResult
}

type ConstraintResultArray = Array<ConstraintResult>

Usage

const signInValidator = combineConstraints({
  keys: createObjectKeysConstraint({
    email: true,
    password: true,
    items: false,
  }),
  values: createObjectConstraint({
    email: combineConstraints({
      notNull,
      notEmpty,
      string,
      email,
    }),
    password: string,
    items: combineConstraints({
      notEmpty,
      array: createArrayConstraint(
        string
      )
    })
  })
})

print(signInValidator({
  email: 'vslinko@yahoo.com',
  password: '',
  items: ['']
}))

{ valid: true,
  message: null,
  children:
   { keys: { valid: true, message: null, children: null },
     values:
      { valid: true,
        message: null,
        children:
         { email:
            { valid: true,
              message: null,
              children:
               { notNull: { valid: true, message: null, children: null },
                 notEmpty: { valid: true, message: null, children: null },
                 string: { valid: true, message: null, children: null },
                 email: { valid: true, message: null, children: null } } },
           password: { valid: true, message: null, children: null },
           items:
            { valid: true,
              message: null,
              children:
               { notEmpty: { valid: true, message: null, children: null },
                 array:
                  { valid: true,
                    message: null,
                    children: [ { valid: true, message: null, children: null } ] } } } } } } }