@yobta/validator
v1.0.0
Published
Tree-shakable es6 validator
Downloads
215
Maintainers
Readme
Yobta!
A promising and ridiculously small es6 validator that tree-shakes well and respects your bundle.
Current state: work in progress
Installation
npm i @yobta/validator
Validators
createValidator(...rules)
– returns sync validatorcreateAsyncValidator(...syncOrAsyncRules)
– returns aync validator
Rules
Pipes
pipe(...rules)
– combines several rules to oneasyncPipe(...syncOrAsyncRules)
– combines several rules to one
Sync Rules
array(errorMessage)
- creates a array rule, coercing unknown value to arrayitems(...rules)
– validates every array item against rulesmaxItems(limit: Number, errorMessage)
– checks if a array length within a limitminItems(limit: Number, errorMessage)
– checks if a array length within a limitunique(errorMessage)
– requires array to have unique values
boolean(errorMessage)
- creates a boolean ruleconstant(value, errorMessage)
- creates a strict equality ruledate(errorMessage)
- creates a date rulemaxDate(limit: Date, errorMessage)
– checks if a value within a date limitminDate(limit: Date, errorMessage)
– checks if a value within a date limit
fallback(defaultValue, ...rules)
- returns adefaultValue
if rules not satisfied, if no rules provided transforms '' orundefined
value to adefaultValue
number(errorMessage)
- converts a value to a finiteNumber
or throwsinteger(errorMessage)
– checks if a value is an integermaxNumber(limit: Number, errorMessage)
– checks if a value within a limitminNumber(limit: Number, errorMessage)
– checks if a value within a limit
oneOf(new Set([1])), errorMessage)
– checks if simple value in a setshape({ key: rule }, errorMessage)
– checks plain object shapedifferent('key', errorMessage)
– creates a rule to check if an object key is not equal to antoher keyidentical('key', errorMessage)
– creates a rule to check if an object key is strictly equal to antoher key
required(errorMessage)
— throws a message if a value is an empty string orundefined
rule((value, ctx) => {...your custom rule, return value})
— allows creating custom validation rulesstring(errorMessage)
– coerses a simple value to string or throwsemail(errorMessage)
– checks if a string value is an emailmaxCharacters(limit: Number, errorMessage)
– checks if a value length within a limitminCharacters(limit: Number, errorMessage)
– checks if a value length within a limitslug(errorMessage)
– checks if a string value is a slugtest(regExp, errorMessage)
– checks if a value passingregExp
test
Async Rules
asyncShape({ field: syncOrAsyncRule() }, errorMessage)
– resolves valid shape
Effects
asyncSubmit(callback)
– executes a callback for a valid form submiteffect(callback)
– executes a callback, returns input valueerrors(callback)
– calls back withYobtaError
success(callback)
– executes a callback whenever the current step have no errorsvalidity(callback)
– maps validation errors to the form inputs, or sends current error to the callback when can't map
Transforms
form(errorMessage)
- transformsHTMLFormElement
or (form)Event
to a plain objectrule(Number)
– transforms any to number
Types
[+] Shape validator
[-] Array validator
- [+] items
- [-] contains (do later)
- [+] unique
- [+] minimum items
- [+] maximum items
[-] String validator
- [+] minimum characters
- [+] maximum characters
- [-] href (do later)
- [-] credit card number (do later)
- [-] phone number (do later)
- [-] base64 (do later)
[+] Number validator
- [+] int
- [+] minimum
- [+] maximum
[+] RegExp test
[+] FormData
Flow Utilities
- [+] catch
- [+] identical
- [+] URLSearchParams
- [+] side effect
- [+] validityYobta
- [-] anyOf
We want to fulfill the front-end needs and create functional promise-based validator which is fun to work with.
General Requirements
- Functional
- Universal
- Immutable
- Sync/async
- Coercion (https://ajv.js.org/coercion.html)
Functional requirements
- Validate: maps, arrays, strings, numbers, booleans, dates, FormData, URLSearchParams
- Flow control: fall-backs, side effects, logic operators, serializers
API proposals
Case 1: Store hydration
We need to get a predictable initial state from the URL, the operation should be sync and silent (no errors) and the state should be a plain object.
const getInitialState = yobta(
urlSearchParamsYobta(),
shapeYobta({
currentTab: [fallback('tab-1', oneOf(()= new Set(['tab-1', 'tab-2', 'tab-3'])))],
myModalIsOpen: [fallback(false, boolean())],
}),
)
const initialState = getInitialState(location.search)
const myStore = createStore('name', initialState)
Case 2: Form validation
We need to get a type-safe form data, but the validation operation should be async, because we don't know if one of the fields exists in our database. This operation can produce errors and we need human friendly error messages.
async function confirmPassword (password) (
const response = await fetch(`/api/my-endpoint?password=${password}`)
if (!response.ok) throw new Error('Wrong password')
return password.data.password
)
const validate = asyncYobta(
effect(toggleFormLock),
formYobta()
asyncShape({
password: [
string(),
asyncSubmit(verifyPassword),
],
new: [
string(),
minYobta(6),
maxYobta(16),
matchYobta(passwordRegExp), // make your own RegExp
],
repeat: [
identicalYobta('new')
],
}),
asyncSubmit(sendMyFormAsJSON),
errors(),
validity(console.error), // https://developer.mozilla.org/en-US/docs/Web/API/HTMLObjectElement/setCustomValidity#examples
effect(toggleFormLock),
)
const myForm = window.getElementByID('myForm')
const [formData, errors] = await validate(myForm)
Docs
- [-] Readme for all
- [-] JSDoc for all
Samples
- Ajv — Follows json-schema.org specs, great choice for a back-end
- Yup — Popular front-end library
- Shark-Validator — a validator es6, but class-based
- formurai — to be researched
Docs coming soon
Kudos:
Andrey Sitnik Joe Calzaretta Jon Schlinkert John-David Dalton