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https://github.com/jupegarnica/garn-validator
Create validations with ease
https://github.com/jupegarnica/garn-validator
checker deno nodejs primitives-checking schema type types validation validator
Last synced: 3 months ago
JSON representation
Create validations with ease
- Host: GitHub
- URL: https://github.com/jupegarnica/garn-validator
- Owner: jupegarnica
- License: mit
- Created: 2020-07-19T11:51:45.000Z (over 4 years ago)
- Default Branch: master
- Last Pushed: 2024-04-23T15:41:35.000Z (7 months ago)
- Last Synced: 2024-07-25T00:36:59.907Z (4 months ago)
- Topics: checker, deno, nodejs, primitives-checking, schema, type, types, validation, validator
- Language: JavaScript
- Homepage: https://npmjs.com/garn-validator
- Size: 2.26 MB
- Stars: 41
- Watchers: 4
- Forks: 2
- Open Issues: 7
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-deno - garn-validator - Create validations with ease. (Modules / Utils)
README
garn-validator: Create validations with ease
Features
- Supports checking primitives or objects with **schemas**
- Apply default value if validation fails.
- Easy to use and learn but **powerful**
- It's totally **composable**
- **Fast** and **without dependencies**
- **Six behaviors**:
- `mustBe` returns the value evaluated or it throws. (default export)
- `isValid` returns `true` or `false`, never throws
- `isValidOrLog` returns `true` or `false` and log error, never throws
- `hasErrors` returns null or Array of errors, never throws
- `mustBeOrThrowAll` returns the value evaluated or throws AggregateError
- `isValidOrLogAll` returns `true` or `false` and log all errors, never throws
- Works with ESModules or CommonJS from **Node** 10.x or **Deno**
- Works in all modern browsers
- Works in all frontend frameworks: **React, Angular, Vue,** etc...
[](https://www.npmjs.com/package/garn-validator)
[](https://www.npmjs.com/package/garn-validator)
[](https://github.com/jupegarnica/garn-validator/actions?query=workflow%3A%22Node+Tests+CI%22)
[](https://github.com/jupegarnica/garn-validator/actions?query=workflow%3A%22Deno+Tests+CI%22)
> DEPRECATION WARNING: `isValidOrThrow` behavior has been deprecated in favor of `mustBe`. Learn more at [mustBe](#mustbe)
Example
```js
import mustBe, { isValid, isValidOrLog } from "garn-validator";
const isValidPassword = isValid(
String, // must be String
(str) => str.length >= 8, // and length >= 8
/[a-z]/, // and have at least one lowercase
/[A-Z]/, // and have at least one uppercase
/[0-9]/, // and have at least one digit
/[-_/!¡?¿$%&/()]/ // and have at least one especial character
);
isValidPassword("12345Aa?"); // returns true
const isValidName = mustBe(String, (name) => name.length > 3).or("anonymous"); // will auto correct to 'anonymous' if fails
const isValidAge = isValidOrLog(
Number,
(age) => age > 18,
(age) => age < 40
);
isValidAge(15); // false, and logs 15 do not match validator (age) => age > 18
// Composition
const isValidUser = mustBe({
name: isValidName,
age: isValidAge,
password: isValidPassword,
country: ["ES", "UK"], // 'ES' or 'UK'
});
const newUser = isValidUser({
name: "", // will be fixed
age: 38,
password: "12345zZ?",
country: "ES",
}); // returns { name: 'anonymous', age: 38, password: '12345zZ?', country: 'ES' }
const anotherUser = isValidUser({
name: "garn",
age: 38,
password: "1234", // incorrect
country: "ES",
}); // it throws --> TypeValidationError: At path /password "1234" do not match validator (str) => str.length >= 8
```
Contents
- [Get started](#get-started)
- [Node](#node)
- [Import with ES Modules](#import-with-es-modules)
- [Require with CommonJs](#require-with-commonjs)
- [Deno](#deno)
- [Basic Usage](#basic-usage)
- [Check against constructor](#check-against-constructor)
- [Check against primitive](#check-against-primitive)
- [Check string against regex](#check-string-against-regex)
- [Check against custom function](#check-against-custom-function)
- [Check against enums (OR operator)](#check-against-enums-or-operator)
- [Check multiple validations (AND operator)](#check-multiple-validations-and-operator)
- [Check object against an schema](#check-object-against-an-schema)
- [Behaviors](#behaviors)
- [mustBe](#mustbe)
- [isValid, isValidOrLog and isValidOrLogAll](#isvalid-isvalidorlog-and-isvalidorlogall)
- [hasErrors](#haserrors)
- [mustBe vs mustBeOrThrowAll](#mustbe-vs-mustbeorthrowall)
- [Utils](#utils)
- [Logical utils](#logical-utils)
- [Numeric utils](#numeric-utils)
- [In depth](#in-depth)
- [Types of validations](#types-of-validations)
- [Primitives](#primitives)
- [Constructors](#constructors)
- [Proxy detection](#proxy-detection)
- [RegExp](#regexp)
- [Custom function](#custom-function)
- [Enums](#enums)
- [Schema](#schema)
- [Optional Keys](#optional-keys)
- [Regexp keys](#regexp-keys)
- [Custom validation used in schemas](#custom-validation-used-in-schemas)
- [Validations in serie (AND operator)](#validations-in-serie-and-operator)
- [Errors](#errors)
- [AggregateError](#aggregateerror)
- [SchemaValidationError](#schemavalidationerror)
- [EnumValidationError](#enumvalidationerror)
- [SerieValidationError](#serievalidationerror)
- [hasErrors](#haserrors-1)
- [Raw Error data](#raw-error-data)
- [Composition in depth](#composition-in-depth)
- [Especial cases](#especial-cases)
- [AsyncFunction & GeneratorFunction](#asyncfunction--generatorfunction)
- [Roadmap](#roadmap)
# Get started
## Node
```bash
npm install garn-validator
```
### Import with ES Modules
```js
// default export is mustBe
import mustBe from "garn-validator";
// or use named export
import { mustBe } from "garn-validator";
```
### Require with CommonJs
```js
const { mustBe } = require("garn-validator/commonjs");
// or use de default export
const mustBe = require("garn-validator/commonjs").default;
```
## Deno
The library can be used as is in typescript
Import from deno third party modules: [deno.land/x/garn_validator](https://deno.land/x/garn_validator)
```ts
// mod.ts
import mustBe from "https://deno.land/x/garn_validator/src/index.js";
```
To have type definitions you can do:
```js
import * as garnValidator from "https://deno.land/x/garn_validator/src/index.js";
import * as ValidatorTypes from "https://deno.land/x/garn_validator/src/index.d.ts";
garnValidator as typeof ValidatorTypes;
const { mustBe } = garnValidator;
```
## Basic Usage
```js
import mustBe from "garn-validator"; // default export is mustBe
const isValidUser = mustBe({ name: String, age: Number });
isValidUser({ name: "garn", age: 38 }); // returns { name: "garn", age: 38 }
isValidUser({ name: "garn", age: "38" }); // it throws
```
### Check against constructor
```js
mustBe(Number)(2); // returns 2
mustBe(String)(2); // it throws
mustBe(Array)([1, 2]); // returns [1, 2]
mustBe(Object)([1, 2]); // it throws
```
Learn more in depth at [Constructors](#constructors)
### Check against primitive
```js
mustBe("a")("a"); // returns "a"
mustBe(true)(false); // it throws
```
Learn more in depth at [Primitives](#primitives)
### Check string against regex
```js
mustBe(/a*/)("a"); // returns "a"
mustBe(/a/)("b"); // it throws
```
Learn more in depth at [RegExp](#regexp)
### Check against custom function
```js
mustBe((value) => value > 0)(33); // returns 33
mustBe((value) => value > 0)(-1); // wil throw
mustBe(Number.isNaN)(NaN); // returns NaN
mustBe(Number.isInteger)(1.1); // wil throw
```
Learn more in depth at [Custom function](#custom-function)
### Check against enums (OR operator)
```js
mustBe(["a", "b"])("a"); // returns "a"
mustBe(["a", "b"])("c"); // it throws
mustBe([Number, String])("18"); // returns "18"
mustBe([null, undefined, false, 0, ""])(18); // it throws
```
Learn more in depth at [Enums](#enums)
### Check multiple validations (AND operator)
```js
mustBe(Array, (array) => array.length === 2)([1, 2]); // returns [1, 2]
mustBe(
(v) => v > 0,
(v) => v < 50
)(100); // it throws
```
Learn more in depth at [Validations in serie (AND operator)](#validations-in-serie-and-operator)
### Check object against an schema
```js
const schema = { a: Number, b: Number }; // a and b are required
const obj = { a: 1, b: 2 };
mustBe(schema)(obj); // returns obj
mustBe({ a: 1 })({ a: 1, b: 2 }); // returns { a: 1, b: 2 }, because b is not checked
mustBe({ c: Number })({ a: 1, b: 2 }); // it throws (c is missing)
// Optional keys
mustBe({ x$: String })({}); // returns {}
```
Learn more in depth at [Schema](#schema)
## Behaviors
All behaviors run the same algorithm but differs in what returns and how behaves.
There are six behaviors that can be divided in two categories:
- It stops in first error (bail):
- `mustBe` returns the value evaluated or it throws. (default export)
- `isValid` returns `true` or `false`, never throws
- `isValidOrLog` returns `true` or `false` and log error, never throws
- It collects all Errors:
- `hasErrors` returns null or Array of errors, never throws
- `mustBeOrThrowAll` returns the value evaluated or throws AggregateError
- `isValidOrLogAll` returns `true` or `false` and log all errors, never throws
### mustBe
`mustBe` returns the value evaluated or it throws.
```js
let input = "Garn";
let userName = mustBe(String)(input); // return 'Garn'
```
```js
let input = "Garn";
let userName;
let isValidName = mustBe(String, (val) => val.length > 4);
try {
userName = isValidName(input); // it throws
} catch (err) {
userName = "anonymous";
}
```
`mustBe` may have attached an .or() to apply a default value if the validation fail.
```js
let input = "Garn";
let isValidName = mustBe(String, (val) => val.length > 4).or("anonymous");
let userName = isValidName(input); // returns 'anonymous'
```
The .or() can receive a function to apply a transformation to the original value.
```js
let input = "42";
let asNumber = mustBe(Number).or((value /* "42" */) => Number(value));
let number = asNumber(input); // returns 42
```
If you need to apply a function as default, you can use a function the returns a function.
```js
let input = "i am not a function";
let noop = () => {};
let mustBeFunction = mustBe(Function).or(() => noop);
let fn = mustBeFunction(input); // returns () => {}
```
It can work nested in a schema
```js
let input = { name: "Garn" };
let isValidName = mustBe(String, (val) => val.length > 4).or("anonymous");
let user = mustBe({ name: isValidName })(input); // { name:'anonymous' }
```
If the .or() fails the whole validation will fail
```js
let input = "not a valid number";
let transformToNumberIfPosible = (maybeNumber) => {
let number = Number(maybeNumber);
if (number == maybeNumber) return number;
else throw new TypeError("not valid number");
};
let asNumber = mustBe(Number).or(transformToNumberIfPosible);
let number = asNumber(input); // it throws CastError (aggregateError) with TypeError: not valid number within its array of errors
```
### isValid, isValidOrLog and isValidOrLogAll
`isValid` returns `true` or `false` never throws, so if it fails for any reason you should know it won't tell you anything but false.
```js
import { isValid } from "garn-validator";
// stops in first Error
isValid(/[a-z]/)("g"); // returns true
isValid(/[a-z]/)("G"); // returns false, doesn't throws
```
`isValidOrLog` is the same as `isValid` but log first error found and stops validating.
`isValidOrLogAll` returns `true` or `false` and log all errors, never throws
```js
import { isValidOrLog } from "garn-validator";
// stops in first Error
isValidOrLog(/[a-z]/)("g"); // do nothing (but also returns true)
isValidOrLog(/[a-z]/)("G"); // logs error and return false
```
### hasErrors
`hasErrors` returns null or Array with all errors found, never throws.
It's very useful to show the user all errors that need to be fixed.
```js
import { hasErrors } from "garn-validator";
// return null or array or errors
// checks until the end
hasErrors(/[a-z]/)("g"); // null
hasErrors(/[a-z]/, Number)("G"); // [TypeValidationError, TypeValidationError]
```
### mustBe vs mustBeOrThrowAll
`mustBe` returns the value evaluated or it throws the first error found.
```js
try {
mustBe({ a: Number, b: String })({ a: null, b: null });
} catch (error) {
error instanceof TypeValidationError; // true
error.message; // At path /a null do not match constructor Number
}
```
`mustBeOrThrowAll` returns the value evaluated or it throws an [`AggregateError`](https://developer.mozilla.org/es/docs/Web/JavaScript/Referencia/Objetos_globales/AggregateError) with all errors found.
```js
try {
mustBeOrThrowAll({ a: Number, b: String })({ a: null, b: null });
} catch (error) {
error instanceof AggregateError; // true
error instanceof SchemaValidationError; // true
console.log(error);
/*
SchemaValidationError: value {"a":null,"b":null} do not match schema {"a":Number,"b":String}
*/
console.log(error.errors);
/*
[
TypeValidationError: At path /a null do not match constructor Number ,
TypeValidationError: At path /b null do not match constructor String ,
]
*/
}
```
But if it finds only one error, it will throw `TypeValidationError`, no AggregateError
```js
try {
mustBeOrThrowAll({ a: Number, b: String })({ a: null, b: "str" });
} catch (error) {
console.log(error);
/*
TypeValidationError: At path /a null do not match constructor Number ,
*/
error instanceof TypeValidationError; // true
error instanceof SchemaValidationError; // false
}
```
Learn more at [Errors](#errors)
## Utils
The library has a bunch of pre-made validations (and growing), which makes easier validations of stings, numbers, objects or dates.
Learn more at [utils test](https://github.com/jupegarnica/garn-validator/blob/1cd727ae647a7a79ffe4ba49312513193d683bdb/tests/utils.test.js)
```js
import {
mustBe,
arrayOf,
and,
Integer,
Numeric,
Positive,
Lowercase,
before,
} from "garn-validator";
let Schema = {
name: Lowercase,
birthday: before(new Date()),
height: and(Number, Positive, Integer),
creditCard: Numeric,
books_id: arrayOf(String),
};
let data = {
name: "garn",
birthday: "1982-03-16",
height: 170,
creditCard: "42424242424242",
books_id: ["123", "321"],
};
let user = mustBe(Schema).or(null)(data);
```
### Logical utils
**`or(...validations)`** Is just a shortcut to an enum.
> Not to be confused with `mustBe().or()`
```js
import { mustBe, or } from "garn-validator";
mustBe(or(Number, String));
// same as:
mustBe([Number, String]);
```
**`and(...validations)`** is a shortcut to `mustBe(...args)`, but semantically useful.
```js
import { mustBe, and } from "garn-validator";
mustBe({ age: and(Number, (num) => num > 18) });
// same as:
mustBe({ age: mustBe(Number, (num) => num > 18) });
```
**`not(...validations)`** it negates the validations passed
```js
import { mustBe, not } from "garn-validator";
// anything but Number
mustBe(not(Number))("qwerty"); // valid, return 'qwerty'
```
### Object utils
**arrayOf()**
As we use the array `[]` as enum, if you need to check the items of an array, you should treat it as an object and check against an schema.
```js
import mustBe from "garn-validator";
mustBe(Array, { [/\d/]: Number })([1, 2, 3]); // returns [1, 2, 3]
mustBe(Array, { [/\d/]: Number })([1, 2, "3"]); // throws
```
In order to not be so ugly you can import `arrayOf` from garn-validator as a shortcut to:
`export const arrayOf = type => isValid(Array, {[/^\d$/]: type})`
```js
import mustBe, { arrayOf } from "garn-validator";
mustBe(arrayOf(Number))([1, 2, 3]); // returns [1, 2, 3]
mustBe(arrayOf(Number))([1, 2, "3"]); // throws
```
**objectOf**
You can import `objectOf` from garn-validator as a shortcut to:
`export const objectOf = type => isValid(Object, {[/./]: type})`
```js
import mustBe, { objectOf } from "garn-validator";
mustBe(objectOf(Number))({ a: 1, b: 2 }); // returns { a: 1, b: 2 }
mustBe(objectOf(Number))({ a: 1, b: "2" }); // throws
```
# In depth
## Types of validations
There are six types of validations: Primitives, Constructors, RegExp, Enums, Schemas and Custom functions
### Primitives
Checking a primitive is a === comparison
Anything that is not and object in JS is a primitive: `Number`, `String`, `undefined`, `null` and `Symbol`
```js
mustBe(1)(1); // returns 1 --> 1 === 1
mustBe("1")(1); // throws, '1' !== 1
mustBe(1n)(1); // throws, 1n !== 1
mustBe(undefined)(null); // throws, undefined !== null
// keep in mind than a symbol is only equal to itself
let s = Symbol();
mustBe(s)(s); // returns s
mustBe(s)(Symbol()); // throws
```
### Constructors
Checking against a constructor means to know if the value evaluated has been created from that constructor
```js
mustBe(Number)(2); // (2).constructor === Number --> true
mustBe(Symbol)(Symbol()); // ok
```
A valid constructor is a `class` or any built-in constructor.
```js
class Car {}
let honda = new Car();
mustBe(Car)(honda); // honda.constructor === Car --> true
```
> **You can't use a normal function used as constructor from the old JS times.**
```js
function Car(name) {
this.name = name;
}
let honda = new Car("honda");
mustBe(Car)(honda); // throws. Car is detected as custom validator function
```
All [built in Constructors](https://github.com/jupegarnica/garn-validator/blob/master/src/constructors.js#L47) are supported
#### Proxy detection
> NOT YET WORKING IN DENO
In order to detect any Object (or Array) is a Proxy we intercept the creation of Proxies.
To have that functionality you must `import "garn-validator/src/proxyDetection.js"` before any creation of Proxies you need to detect;
```js
import "garn-validator/src/proxyDetection.js";
const target = { a: 1 };
const proxy = new Proxy(target, {
get: () => 33,
});
mustBe(Proxy)(proxy); // returns proxy
```
without running garn-validator/src/proxyDetection.js
```js
// NO IMPORT
const target = { a: 1 };
const proxy = new Proxy(target, {
get: () => 33,
});
mustBe(Proxy)(proxy); // fails
```
### RegExp
The perfect validator to check strings. It does what you expect:
```js
let isLowerCased = mustBe(/^[a-z]+$/);
isLowerCased("honda"); // /^[a-z]+$/.test('honda') --> true
// or building a regexp with the constructor RexExp;
mustBe(new RegExp(/^[a-z]+$/))("honda"); // true
```
### Custom function
Any function that is not a constructor is treated as custom validator.
It must return any truthy value in order to pass the validation.
```js
mustBe((val) => val >= 0)(10); // returns 10
mustBe((val) => val >= 0)(-10); // throws
mustBe(() => "I am truthy")(10); // returns 10
mustBe(() => [])(10); // returns 10
```
To fail a validation may return a falsy value or throw an error.
If it returns a falsy value, the default error will be thrown: TypeValidationError
If it throws an error, that error will be thrown.
```js
mustBe(() => false)(10); // throws TypeValidationError
mustBe(() => 0)(10); // throws TypeValidationError
mustBe(() => {
throw new RangeError("ups");
})(10); // throws RangeError
mustBe(() => {
throw "ups";
})(10); // throws 'ups'
```
### Enums
Enums works as OR operator. Must be an array which represent all options.
```js
let cities = ["valencia", "new york", "salzburg"];
mustBe(cities)("valencia"); // returns "valencia"
mustBe(cities)("madrid"); // throws
```
But it's much more powerful than checking against primitives. It can contain any type of validator.
It checks every item until one passes.
```js
let isNumberOrBigInt = [Number, BigInt]; // must be Number or BigInt
mustBe(isNumberOrBigInt)(1n); // returns 1n
mustBe(isNumberOrBigInt)(1); // returns 1
let isFalsy = [0, "", null, undefined, false];
mustBe(isFalsy)(""); // returns ""
let isNumberAlike = [Number, (val) => val === Number(val)];
mustBe(isNumberAlike)(1n); // returns 1n
mustBe(isNumberAlike)(1); // returns 1
mustBe(isNumberAlike)("1"); // returns "1"
```
### Schema
An Schema is just a plain object telling in each key which validation must pass.
```js
let schema = {
name: String, // required and be a Number
age: (age) => age > 18, // required and be a greater than 18
tel: [Number, String], // required and be Number or String
role: ["admin", "user"], // required and be 'admin' or 'user'
credentials: {
// must be and object and will be validate with this "subSchema"
pass: String,
email: String,
},
};
let obj = {
name: "garn",
age: 20,
tel: "+34617819234",
role: "admin",
credentials: {
pass: "1234",
email: "[email protected]",
},
};
mustBe(schema)(obj); // returns obj
```
> **Only the keys in the schema will be checked. Any key not present in the schema won't be checked (under consideration to be changed)**
```js
mustBe({})({ a: 1 }); // returns { a: 1 } , a is not in the schema
```
#### Optional Keys
And optional key must be `undefined` , `null`, or pass the validation
```js
mustBe({ x$: Number })({ x: 1 }); // returns { x: 1 }, x is present and is Number
mustBe({ x$: String })({ x: 1 }); // it throws, x is present but is not String
mustBe({ x$: String })({}); // returns {}, x is undefined
mustBe({ x$: String })({ x: undefined }); // returns { x: undefined }, x is undefined
mustBe({ x$: String })({ x: null }); // returns { x: null }, x is null
```
You can use `key$` or `'key?'`. It would be nicer to have `key?` without quotes but is not valid JS
```js
mustBe({ "x?": String })({}); // returns {}
```
#### Regexp keys
You can validate multiple keys at once using a regexp key
```js
mustBe({
[/./]: String,
})({
a: "a",
b: "b",
}); // ok
// or write it as plain string
mustBe({
"/./": String,
})({
a: "a",
b: 1, // fails
}); // throws
// only checks the keys that matches regex
mustBe({
[/^[a-z]+$/]: Number,
})({
x: 1,
y: 2,
z: 3,
CONSTANT: "foo", // not checked
}); // ok, all lowercased keys are numbers
```
> **The required keys and optional won't be check against a regexp key**
```js
mustBe({
[/./]: Number,
x: String, // this required key has priority against regex key
})({
x: "x", // not checked as Number, checked as String
}); // ok, x is String
mustBe({
[/./]: Number,
x: String,
})({
x: "x", // not checked as Number, checked as String
y: "y", // checked as Number, fails
}); // throw
mustBe({
[/./]: Number,
$x: String,
y: String,
})({
x: "x", // not checked as Number, checked as String
y: "y", // checked as String
z: "z", // checked as Number, fails
}); // throw
```
This feature is perfect to note that any key not specified in schema is not allowed
```js
mustBe({
x: String,
[/./]: () => false,
})({
x: "x",
y: "y", // fails
});
```
#### Custom validation used in schemas
When using a custom validator inside an schema will be run with 3 arguments: `(value, root, keyName) => {}`
- value: the value present in that key from the object
- root: the whole object, not matter how deep the validation occurs
- keyName: the name of the key to be checked.
```js
// against root obj
mustBe({
max: (val, root, keyName) => val > root.min,
min: (val, root, keyName) => val < root.max,
})({
max: 1,
min: -1,
}); // ok
mustBe({
max: (val, root, keyName) => val > root.min,
min: (val, root, keyName) => val < root.max,
})({
max: 10,
min: 50,
}); // it throws
// all key must be at least 3 characters
mustBe({
[/./]: (val, root, keyName) => keyName.length > 3,
})({
max: 1, // key too short
longKey: 1, // valid key
}); // it throws, max key is too short
```
### Validations in serie (AND operator)
The validator constructor can receive as many validations as needed.
All will be checked until one fails
```js
const isArrayOfLength2 = mustBe(Array, (array) => array.length === 2);
isArrayOfLength2([1, 2]); // returns [1, 2]
mustBe(
(v) => v > 0,
(v) => v < 50 // will fail
)(100); // it throws
```
```js
const isValidPassword = mustBe(
String, // must be an String
(str) => str.length >= 8, // and its length must be at least 8
/[a-z]/, // and must have at least one lowercase
/[A-Z]/, // and must have at least one uppercase
/[0-9]/, // and must have at least one number
/[-_/!·$%&/()]/ // and must have at least one especial character
);
isValidPassword("12345wW-"); // returns "12345wW-"
isValidPassword("12345"); // fails
```
## Errors
If a validation fails it will throw `new TypeValidationError(meaningfulMessage)` which inherits from `TypeError`. It can be imported.
If it throws an error from a custom validator, that error will be thrown.
```js
import { mustBe, TypeValidationError } from "garn-validator";
try {
mustBe(Boolean)(33);
} catch (error) {
error instanceof TypeValidationError; // true
error instanceof TypeError; // true
}
try {
mustBe(() => {
throw "ups";
})(33);
} catch (error) {
error === "ups"; // true
}
try {
mustBe(() => {
throw new RangeError("out of range");
})(33);
} catch (error) {
error instanceof RangeError; // true
error instanceof TypeError; // false
}
```
### AggregateError
There are 3 types a `AggregateError` that can be thrown:
- `SchemaValidationError`: thrown when more than one key fails checking an schema
- `EnumValidationError`: thrown when all validations fails checking an enum
- `SerieValidationError`: thrown when more than one validation fails checking an Serie
All of them inherits from `AggregateError` and has a property errors with an array of all errors collected
```js
try {
mustBeOrThrowAll(Number, String)(null);
} catch (error) {
error instanceof AggregateError; // true
console.log(error.errors);
/*
[
TypeValidationError: value null do not match constructor Number ,
TypeValidationError: value null do not match constructor String ,
]
*/
}
```
#### SchemaValidationError
If using mustBeOrThrowAll more than one key fails checking an Schema , it will throw a SchemaValidationError with all Errors aggregated in error.errors.
If only one key fail it will throw only that Error (not an AggregateError)
SchemaValidationError inherits from AggregateError,
> But if using `mustBe` only the first Error will be thrown.
```js
// more than 2 keys fails
try {
mustBeOrThrowAll({ a: 1, b: 2 })({});
} catch (error) {
console.log(error instanceof SchemaValidationError); // true
console.log(error instanceof AggregateError); // true
console.log(error.errors.length); // 2
}
// only 1 key fails
try {
mustBeOrThrowAll({ a: 1 })({});
} catch (error) {
console.log(error instanceof TypeError); // true
console.log(error instanceof SchemaValidationError); // false
}
```
#### EnumValidationError
If all validations of an enum fails, it will throw a EnumValidationError with all Errors aggregated in error.errors
But if the length of the enum is 1, it will throw only that error.
EnumValidationError inherits from AggregateError.
```js
try {
mustBe([Boolean, String])(1);
} catch (error) {
console.log(error instanceof EnumValidationError); // true
console.log(error instanceof AggregateError); // true
}
try {
mustBe([Boolean])(1);
} catch (error) {
console.log(error instanceof EnumValidationError); // false
console.log(error instanceof TypeError); // true
}
```
#### SerieValidationError
If using mustBeOrThrowAll fails all validations of a serie , it will throw a SerieValidationError with all Errors aggregated in error.errors
But if the length of the enum is 1. it will throw only this error.
SerieValidationError inherits from AggregateError.
```js
try {
mustBeOrThrowAll(Boolean, String)(1);
} catch (error) {
console.log(error instanceof SerieValidationError); // true
console.log(error instanceof AggregateError); // true
}
try {
mustBeOrThrowAll(Boolean)(1);
} catch (error) {
console.log(error instanceof SerieValidationError); // false
console.log(error instanceof TypeError); // true
}
```
#### hasErrors
`hasErrors` will flatMap all errors found. No AggregateError will be in the array returned.
```js
hasErrors(/[a-z]/)("g"); // null
hasErrors(/[a-z]/, Number)("G");
/*
[
TypeValidationError: value "G" do not match regex /[a-z]/,
TypeValidationError: value "G" do not match constructor Number ,
]
*/
hasErrors({ a: Number, b: String })({ a: null, b: null });
/*
[
TypeValidationError: At path /a null do not match constructor Number,
TypeValidationError: At path /b null do not match constructor String
]
*/
```
### Raw Error data
All errors the library throws has the raw data collected in a property called `raw`.
```js
try {
mustBe({ a: Number })({ a: null });
} catch (error) {
console.log(error.raw);
}
/*
{
// the validation failing
type: [Function: Number],
// the value evaluated
value: null,
// the root object
root: { a: null },
// the key failing
keyName: 'a',
// the whole path where the evaluation happens as an array
path: [ 'a' ],
// the error message
message: 'At path /a null do not match constructor Number',
// the error constructor
'$Error': [class TypeValidationError extends TypeError],
// the behavior applied
behavior: {
collectAllErrors: false,
onValid: [Function: onValidDefault],
onInvalid: [Function: onInvalidDefault]
},
}
*/
```
### Composition in depth
You can create your own validators and use them as custom validation creating new ones.
```js
const isPositive = mustBe((v) => v > 0);
const isNotBig = mustBe((v) => v < 100);
const isNumber = mustBe([Number, String], (num) => num == Number(num));
mustBe(isNumber, isPositive, isNotBig)("10"); // returns "10"
mustBe(isNumber, isPositive, isNotBig)(200); // it throws
```
When used inside another kind of behavior, it will inherit the behavior from where it has been used.
```js
const isNotBig = isValidOrLog((v) => v < 100);
// its normal behavior
isNotBig(200); // false, logs '200 do not match validator (v) => v < 100'
isValid(isNotBig)(200); // false , and won't log
mustBe(isNotBig)(200); // fails , and won't log
hasErrors(isNotBig)(200); // array, won't log
/*
[
new TypeValidationError('200 do not match validator (v) => v < 100')
]
*/
```
Actually, it's not treated as a custom validation function. No matter is your are using `hasErrors` which return null when nothing fails, and it's just works.
```js
const isBigNumber = hasErrors(
[Number, String],
(num) => num == Number(num),
(num) => num > 1000
);
// its normal behavior
isBigNumber("a12");
/* [
new TypeValidationError(""a12" do not match validator (num) => num == Number(num)"),
new TypeValidationError(""a12" do not match validator num => num > 1000"),
];
*/
// inherit behavior
isValidOrLog(isBigNumber)("a12"); // false, and log only one error value "a10" do not match validator (num) => num == Number(num)
```
## Especial cases
### AsyncFunction & GeneratorFunction
`AsyncFunction` and `GeneratorFunction` constructors are not in the global scope of any of the three JS environments (node, browser or deno). If you need to check an async function or a generator you can import them from garn-validator.
> Note: Async functions and generators are not normal function, so it will fail against Function constructor
```js
import mustBe, { AsyncFunction, GeneratorFunction } from "garn-validator";
mustBe(AsyncFunction)(async () => {}); // ok
mustBe(GeneratorFunction)(function* () {}); // ok
mustBe(Function)(function* () {}); // throws
mustBe(Function)(async function () {}); // throws
```
# Roadmap
- [x] Check value by constructor
- [x] Enum type
- [x] Shape type
- [x] Custom validation with a function (value, root, keyName)
- [x] Check RegEx
- [x] Match object key by RegEx
- [x] Multiples behaviors
- [x] ArrayOf & objectOf
- [x] Multiples validations `isValid(String, val => val.length > 3, /^[a-z]+$/ )('foo')`
- [x] Schema with optionals key `{ 'optionalKey?': Number }` or `{ optionalKey$: Number }`
- [x] Setting for check all keys (no matter if it fails) and return (or throw) an array of errors
- [x] Support for deno
- [x] Support for browser
- [x] Behavior applyDefaultsOnError. (syntax `mustBe(Number).or(0)`)
- [ ] Async validation support
- [ ] More built-in utils functions