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TypeBox

JSON Schema Type Builder with Static Type Resolution for TypeScript



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Install

Node

$ npm install @sinclair/typebox --save

Deno

import { Static, Type } from 'https://deno.land/x/typebox/src/typebox.ts'

Example

import { Static, Type } from '@sinclair/typebox'

const T = Type.String()     // const T = { type: 'string' }

type T = Static<typeof T>   // type T = string

Overview

TypeBox is a type builder library that creates in-memory JSON Schema objects that can be statically inferred as TypeScript types. The schemas produced by this library are designed to match the static type checking rules of the TypeScript compiler. TypeBox enables one to create unified types that can be statically checked by TypeScript and runtime asserted using standard JSON Schema validation.

TypeBox can be used as a simple tool to build up complex schemas or integrated into RPC or REST services to help validate data received over the wire. It offers a type system aligned to the capabilities of TypeScript and can be used equally well in JavaScript environments.

License MIT

Contents

Usage

The following demonstrates TypeBox's general usage.

import { Static, Type } from '@sinclair/typebox'

//--------------------------------------------------------------------------------------------
//
// Let's say you have the following type ...
//
//--------------------------------------------------------------------------------------------

type T = {
  id: string,
  name: string,
  timestamp: number
}

//--------------------------------------------------------------------------------------------
//
// ... you can express this type in the following way.
//
//--------------------------------------------------------------------------------------------

const T = Type.Object({                              // const T = {
  id: Type.String(),                                 //   type: 'object',
  name: Type.String(),                               //   properties: { 
  timestamp: Type.Integer()                          //     id: { 
})                                                   //       type: 'string' 
                                                     //     },
                                                     //     name: { 
                                                     //       type: 'string' 
                                                     //     },
                                                     //     timestamp: { 
                                                     //       type: 'integer' 
                                                     //     }
                                                     //   }, 
                                                     //   required: [
                                                     //     'id',
                                                     //     'name',
                                                     //     'timestamp'
                                                     //   ]
                                                     // } 

//--------------------------------------------------------------------------------------------
//
// ... then infer back to the original static type this way.
//
//--------------------------------------------------------------------------------------------

type T = Static<typeof T>                            // type T = {
                                                     //   id: string,
                                                     //   name: string,
                                                     //   timestamp: number
                                                     // }

//--------------------------------------------------------------------------------------------
//
// ... then use the type both as JSON schema and as a TypeScript type.
//
//--------------------------------------------------------------------------------------------

function receive(value: T) {                         // ... as a Type

  if(JSON.validate(T, value)) {                      // ... as a Schema
  
    // ok...
  }
}

Types

The following table outlines the TypeBox mappings between TypeScript and JSON schema.

┌────────────────────────────────┬─────────────────────────────┬────────────────────────────────┐
 TypeBox                         TypeScript                   JSON Schema                    
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Any()            type T = any                 const T = { }                  
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Unknown()        type T = unknown             const T = { }                  
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.String()         type T = string              const T = {                    
                                                                type: 'string'               
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Number()         type T = number              const T = {                    
                                                                type: 'number'               
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Integer()        type T = number              const T = {                    
                                                                type: 'integer'              
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Boolean()        type T = boolean             const T = {                    
                                                                type: 'boolean'              
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Null()           type T = null                const T = {                    
                                                                 type: 'null'                
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.RegEx(/foo/)     type T = string              const T = {                    
                                                                 type: 'string',             
                                                                 pattern: 'foo'              
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Literal(42)      type T = 42                  const T = {                    
                                                                 const: 42                   
                                                                 type: 'number'              
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Array(           type T = number[]            const T = {                    
   Type.Number()                                                type: 'array',               
 )                                                              items: {                     
                                                                  type: 'number'             
                                                                }                            
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Object({type T = {                   const T = {                    
   x: Type.Number(),               x: number,                   type: 'object',              
   y: Type.Number()                y: number                    properties: { })                              }                                 x: {                      
                                                                     type: 'number'          
                                                                   },                        
                                                                   y: {                      
                                                                     type: 'number'          
                                                                   }                         
                                                                },                           
                                                                required: ['x', 'y']         
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Tuple([          type T = [number, number]    const T = {                    
   Type.Number(),                                               type: 'array',               
   Type.Number()                                                items: [{                    
 ])                                                                type: 'number'            
                                                                 }, {                        
                                                                   type: 'number'            
                                                                 }],                         
                                                                 additionalItems: false,     
                                                                 minItems: 2,                
                                                                 maxItems: 2                 
                                                              }                              
                                                                                             
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 enum Foo {                      enum Foo {                   const T = {                    
   A,                              A,                           anyOf: [{                    
   B                               B                              type: 'number', }                               }                                const: 0                   
                                                                }, { const T = Type.Enum(Foo)        type T = Foo                     type: 'number',            
                                                                  const: 1                   
                                                                }]                           
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.KeyOf(           type T = keyof {             const T = {                    
   Type.Object({                   x: number,                   anyOf: [{                    
     x: Type.Number(),             y: number                      type: 'string',            
     y: Type.Number()            }                                const: 'x'                 
   })                                                           }, {                         
 )                                                                type: 'string',            
                                                                  const: 'y'                 
                                                                }]                           
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Union([          type T = string | number     const T = {                    
   Type.String(),                                               anyOf: [{                    
   Type.Number()                                                   type: 'string'            
 ])                                                             }, {                         
                                                                   type: 'number'            
                                                                }]                           
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Intersect([      type T = {                   const T = {                    
   Type.Object({                   x: number                    type: 'object',              
     x: Type.Number()            } & {                          properties: {   }),                             y: number                      x: {                       
   Type.Object({}                                  type: 'number'           
     y: Type.Number()                                             },                         
   })                                                             y: {                       
 ])                                                                 type: 'number'           
                                                                  }                          
                                                                },                           
                                                                required: ['x', 'y']         
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Record(          type T = Record<             const T = {                    
   Type.String(),                  string,                      type: 'object',              
   Type.Number()                   number,                      patternProperties: {         
 )                               >                                '^.*$': {                  
                                                                    type: 'number'           
                                                                  }                          
                                                                }                            
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Partial(         type T = Partial<{           const T = {                    
   Type.Object({                   x: number,                   type: 'object',              
     x: Type.Number(),             y: number                    properties: {                
     y: Type.Number()           | }>                               x: {                       
   })                                                               type: 'number'           
 )                                                                },                         
                                                                  y: {                       
                                                                    type: 'number'           
                                                                  }                          
                                                                }                            
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Required(        type T = Required<{          const T = {                    
   Type.Object({                   x?: number,                  type: 'object',              
     x: Type.Optional(             y?: number                   properties: {                
       Type.Number()            | }>                               x: {                       
     ),                                                             type: 'number'           
     y: Type.Optional(                                            },                         
       Type.Number()                                              y: {                       
     )                                                              type: 'number'           
   })                                                             }                          
 )                                                              },                           
                                                                required: ['x', 'y']         
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Pick(            type T = Pick<{              const T = {                    
   Type.Object({                   x: number,                   type: 'object',              
     x: Type.Number(),             y: number                    properties: {                
     y: Type.Number()           | }, 'x'>                          x: {                       
   }), ['x']                                                        type: 'number'           
 )                                                                }                          
                                                                },                           
                                                                required: ['x']              
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Omit(            type T = Omit<{              const T = {                    
   Type.Object({                   x: number,                   type: 'object',              
     x: Type.Number(),             y: number                    properties: {                
     y: Type.Number()           | }, 'x'>                          y: {                       
   }), ['x']                                                        type: 'number'           
 )                                                                }                          
                                                                },                           
                                                                required: ['y']              
                                                              }                              
                                                                                             
└────────────────────────────────┴─────────────────────────────┴────────────────────────────────┘

Modifiers

TypeBox provides modifiers that can be applied to an objects properties. This allows for optional and readonly to be applied to that property. The following table illustates how they map between TypeScript and JSON Schema.

┌────────────────────────────────┬─────────────────────────────┬────────────────────────────────┐
 TypeBox                         TypeScript                   JSON Schema                    
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Object({         type T = {                   const T = {                    
   name: Type.Optional(            name?: string                type: 'object',              
     Type.String()               }                              properties: {                
   )                                                               name: {                   
 })  	                                                              type: 'string'          
                                                                   }                         
                                                                }                            
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Object({         type T = {                   const T = {                    
   name: Type.Readonly(            readonly name: string        type: 'object',              
     Type.String()               }                              properties: {                
   )                                                              name: {                    
 })  	                                                             type: 'string'           
                                                                  }                          
                                                                },                           
                                                                required: ['name']           
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Object({         type T = {                   const T = {                    
   name: Type.ReadonlyOptional(    readonly name?: string       type: 'object',              
     Type.String()               }                              properties: {                
   )                                                              name: {                    
 })  	                                                             type: 'string'           
                                                                  }                          
                                                                }                            
                                                              }                              
                                                                                             
└────────────────────────────────┴─────────────────────────────┴────────────────────────────────┘

Options

You can pass additional JSON schema options on the last argument of any given type. The following are some examples.

// string must be an email
const T = Type.String({ format: 'email' })

// number must be a multiple of 2
const T = Type.Number({ multipleOf: 2 })

// array must have at least 5 integer values
const T = Type.Array(Type.Integer(), { minItems: 5 })

Extended Types

In addition to JSON schema types, TypeBox provides several extended types that allow for function and constructor types to be composed. These additional types are not valid JSON Schema and will not validate using typical JSON Schema validation. However, these types can be used to frame JSON schema and describe callable interfaces that may receive JSON validated data. These types are as follows.

┌────────────────────────────────┬─────────────────────────────┬────────────────────────────────┐
 TypeBox                         TypeScript                   Extended Schema                
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Constructor([    type T = new (               const T = {                    
   Type.String(),                 arg0: string,                 type: 'constructor'          
   Type.Number()                  arg1: number                  parameters: [{               
 ], Type.Boolean())              ) => boolean                     type: 'string'             
                                                                }, {                         
                                                                  type: 'number'             
                                                                }],                          
                                                                return: {                    
                                                                  type: 'boolean'            
                                                                }                            
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Function([       type T = (                   const T = {                    
|   Type.String(),                 arg0: string,                 type : 'function',           
   Type.Number()                  arg1: number                  parameters: [{               
 ], Type.Boolean())              ) => boolean                     type: 'string'             
                                                                }, {                         
                                                                  type: 'number'             
                                                                }],                          
                                                                return: {                    
                                                                  type: 'boolean'            
                                                                }                            
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Uint8Array()     type T = Uint8Array          const T = {                    
                                                                type: 'object',              
                                                                specialized: 'Uint8Array'    
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Promise(         type T = Promise<string>     const T = {                    
   Type.String()                                                type: 'promise',             
 )                                                              item: {                      
                                                                  type: 'string'             
                                                                }                            
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Undefined()      type T = undefined           const T = {                    
                                                                type: 'object',              
                                                                specialized: 'Undefined'     
                                                              }                              
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Type.Void()           type T = void                const T = {                    
                                                                type: 'null'                 
                                                              }                              
                                                                                             
└────────────────────────────────┴─────────────────────────────┴────────────────────────────────┘

Reference Types

Use Type.Ref(...) to create referenced types. The target type must specify an $id.

const T = Type.String({ $id: 'T' })                  // const T = {
                                                     //    $id: 'T',
                                                     //    type: 'string'
                                                     // }
                                             
const R = Type.Ref(T)                                // const R = {
                                                     //    $ref: 'T'
                                                     // }

Recursive Types

Use Type.Recursive(...) to create recursive types.

const Node = Type.Recursive(Node => Type.Object({    // const Node = {
  id: Type.String(),                                 //   $id: 'Node',
  nodes: Type.Array(Node)                            //   type: 'object',
}), { $id: 'Node' })                                 //   properties: {
                                                     //     id: {
                                                     //       type: 'string'
                                                     //     },
                                                     //     nodes: {
                                                     //       type: 'array',
                                                     //       items: {
                                                     //         $ref: 'Node'
                                                     //       }
                                                     //     }
                                                     //   },
                                                     //   required: [
                                                     //     'id',
                                                     //     'nodes'
                                                     //   ]
                                                     // }

type Node = Static<typeof Node>                      // type Node = {
                                                     //   id: string
                                                     //   nodes: Node[]
                                                     // }

function test(node: Node) {
  const id = node.nodes[0].nodes[0].nodes[0]         // id is string
                 .nodes[0].nodes[0].nodes[0]
                 .nodes[0].nodes[0].nodes[0]
                 .id
}

Generic Types

Generic types can be created using functions. The following creates a generic Nullable<T> type.

import { Type, Static, TSchema } from '@sinclair/typebox'

const Nullable = <T extends TSchema>(type: T) => Type.Union([type, Type.Null()])

const T = Nullable(Type.String())                    // const T = {
                                                     //   anyOf: [{
                                                     //     type: 'string'
                                                     //   }, {
                                                     //     type: 'null'
                                                     //   }]
                                                     // }

type T = Static<typeof T>                            // type T = string | null

const U = Nullable(Type.Number())                    // const U = {
                                                     //   anyOf: [{
                                                     //     type: 'number'
                                                     //   }, {
                                                     //     type: 'null'
                                                     //   }]
                                                     // }

type U = Static<typeof U>                            // type U = number | null

Unsafe Types

Use Type.Unsafe(...) to create custom schemas with user defined inference rules.

const T = Type.Unsafe<string>({ type: 'number' })    // const T = {
                                                     //   type: 'number'
                                                     // }

type T = Static<typeof T>                            // type T = string

The Type.Unsafe(...) function can be used to create schemas for validators that require specific schema representations. An example of this would be OpenAPI's nullable and enum schemas which are not provided by TypeBox. The following demonstrates using Type.Unsafe(...) to create these types.

import { Type, Static, TSchema } from '@sinclair/typebox'

//--------------------------------------------------------------------------------------------
//
// Nullable<T>
//
//--------------------------------------------------------------------------------------------

function Nullable<T extends TSchema>(schema: T) {
  return Type.Unsafe<Static<T> | null>({ ...schema, nullable: true })
}

const T = Nullable(Type.String())                    // const T = {
                                                     //   type: 'string',
                                                     //   nullable: true
                                                     // }

type T = Static<typeof T>                            // type T = string | null

//--------------------------------------------------------------------------------------------
//
// StringUnion<[...]>
//
//--------------------------------------------------------------------------------------------

function StringEnum<T extends string[]>(values: [...T]) {
  return Type.Unsafe<T[number]>({ enum: values })
}

const T = StringEnum(['A', 'B', 'C'])                // const T = {
                                                     //   enum: ['A', 'B', 'C']
                                                     // }

type T = Static<typeof T>                            // type T = 'A' | 'B' | 'C'

Conditional Types

Use Conditional.Extends(...) to create conditional mapped types.

import { Conditional } from '@sinclair/typebox/conditional'

The following table shows the TypeBox mappings between TypeScript and JSON schema.

┌────────────────────────────────┬─────────────────────────────┬────────────────────────────────┐
 TypeBox                         TypeScript                   JSON Schema                    
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Conditional.Extends(  type T =                     const T = {                    
   Type.String(),                 string extends number         const: false,                
   Type.Number(),                 true : false                  type: 'boolean'              
   Type.Literal(true),                                        }                              
   Type.Literal(false)                                                                       
 )                                                                                           
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Conditional.Extract(  type T = Extract<            const T = {                    
   Type.Union([                    'a' | 'b' | 'c',             anyOf: [{                    
     Type.Literal('a'),            'a' | 'f'                      const: 'a'                 
     Type.Literal('b'),          >                                type: 'string'             
     Type.Literal('c')                                          }]                           
   ]),                                                        }                              
   Type.Union([                                                                              
     Type.Literal('a'),                                                                      
     Type.Literal('f')                                                                       
   ])                                                                                        
 )                                                                                           
                                                                                             
├────────────────────────────────┼─────────────────────────────┼────────────────────────────────┤
 const T = Conditional.Exclude(  type T = Exclude<            const T = {                    
   Type.Union([                    'a' | 'b' | 'c',             anyOf: [{                    
     Type.Literal('a'),            'a'                            const: 'b',                
     Type.Literal('b'),          >                                type: 'string'             
     Type.Literal('c')                                          }, {                         
   ]),                                                            const: 'c',                
   Type.Union([                                                   type: 'string'             
     Type.Literal('a')                                          }]                           
   ])                                                         }                              
 )                                                                                           
                                                                                             
└────────────────────────────────┴─────────────────────────────┴────────────────────────────────┘

Values

Use Value.Create(...) to generate values from types.

import { Value } from '@sinclair/typebox/value'
import { Type } from '@sinclair/typebox'

const T = Type.Object({
  x: Type.Number({ default: 1 }),
  y: Type.Number()
})

const V = Value.Create(T)                            // const V = {
                                                     //   x: 1,
                                                     //   y: 0
                                                     // }

Use Value.Cast(...) to cast a value into a given type.

import { Value } from '@sinclair/typebox/value'
import { Type } from '@sinclair/typebox'

const T = Type.Object({
  x: Type.Number(),
  y: Type.Number()
})

const A = Value.Cast(T, null)                          // const A = { x: 0, y: 0 }

const B = Value.Cast(T, { x: 1 })                      // const B = { x: 1, y: 0 }

const C = Value.Cast(T, { x: 1, y: 2, z: 3 })          // const C = { x: 1, y: 2 }

Guards

Use a TypeGuard to test if a value meets a TypeBox type specification. Guards can be helpful when reflecting types.

import { TypeGuard } from '@sinclair/typebox/guard'
import { Type }  from '@sinclair/typebox'

const T = Type.String()

if(TypeGuard.TString(T)) {
    
  // T is TString
}

Strict

TypeBox schemas contain the Kind and Modifier symbol properties. These properties are provided to enable runtime type reflection on schemas, as well as helping TypeBox internally compose types. These properties are not strictly valid JSON schema; so in some cases it may be desirable to omit them. TypeBox provides a Type.Strict() function that will omit these properties if necessary.

const T = Type.Object({                              // const T = {
  name: Type.Optional(Type.String())                 //   [Kind]: 'Object',
})                                                   //   type: 'object',
                                                     //   properties: {
                                                     //     name: {
                                                     //       [Kind]: 'String',
                                                     //       type: 'string',
                                                     //       [Modifier]: 'Optional'
                                                     //     }
                                                     //   }
                                                     // }

const U = Type.Strict(T)                             // const U = {
                                                     //   type: 'object', 
                                                     //   properties: { 
                                                     //     name: { 
                                                     //       type: 'string' 
                                                     //     } 
                                                     //   } 
                                                     // }

Validation

TypeBox schemas target JSON Schema draft 6 so any validator capable of draft 6 should be fine. A good library to use for validation in JavaScript environments is Ajv. The following example shows setting up Ajv to work with TypeBox.

$ npm install ajv ajv-formats --save
//--------------------------------------------------------------------------------------------
//
// Import TypeBox and Ajv
//
//--------------------------------------------------------------------------------------------

import { Type }   from '@sinclair/typebox'
import addFormats from 'ajv-formats'
import Ajv        from 'ajv'

//--------------------------------------------------------------------------------------------
//
// Setup Ajv validator with the following options and formats
//
//--------------------------------------------------------------------------------------------

const ajv = addFormats(new Ajv({}), [
  'date-time', 
  'time', 
  'date', 
  'email',  
  'hostname', 
  'ipv4', 
  'ipv6', 
  'uri', 
  'uri-reference', 
  'uuid',
  'uri-template', 
  'json-pointer', 
  'relative-json-pointer', 
  'regex'
])

//--------------------------------------------------------------------------------------------
//
// Create a TypeBox type
//
//--------------------------------------------------------------------------------------------

const T = Type.Object({
  x: Type.Number(),
  y: Type.Number(),
  z: Type.Number()
})

//--------------------------------------------------------------------------------------------
//
// Validate Data
//
//--------------------------------------------------------------------------------------------

const R = ajv.validate(T, { x: 1, y: 2, z: 3 })      // const R = true

Please refer to the official Ajv documentation for additional information on using Ajv.

Compiler

TypeBox provides an optional high performance runtime type checker that can be used in applications that require extremely fast validation. This type checker is optimized for TypeBox types only whose schematics are known in advance. If defining custom schemas with Type.Unsafe<T> please consider Ajv.

The following demonstrates its use.

import { TypeCompiler } from '@sinclair/typebox/compiler'
import { Type } from '@sinclair/typebox'

const C = TypeCompiler.Compile(Type.Object({         // const C: TypeCheck<TObject<{
  x: Type.Number(),                                  //     x: TNumber;
  y: Type.Number(),                                  //     y: TNumber;
  z: Type.Number()                                   //     z: TNumber;
}))                                                  // }>>

const R = C.Check({ x: 1, y: 2, z: 3 })              // const R = true 

Validation errors can be read with the Errors(...) function.

const C = TypeCompiler.Compile(Type.Object({         // const C: TypeCheck<TObject<{
  x: Type.Number(),                                  //     x: TNumber;
  y: Type.Number(),                                  //     y: TNumber;
  z: Type.Number()                                   //     z: TNumber;
}))                                                  // }>>

const value = { }

const errors = [...C.Errors(value)]                  // const errors = [{
                                                     //   schema: { type: 'number' },
                                                     //   path: '/x',
                                                     //   value: undefined,
                                                     //   message: 'Expected number'
                                                     // }, {
                                                     //   schema: { type: 'number' },
                                                     //   path: '/y',
                                                     //   value: undefined,
                                                     //   message: 'Expected number'
                                                     // }, {
                                                     //   schema: { type: 'number' },
                                                     //   path: '/z',
                                                     //   value: undefined,
                                                     //   message: 'Expected number'
                                                     // }]

Compiled routines can be inspected with the .Code() function.

const C = TypeCompiler.Compile(Type.String())        // const C: TypeCheck<TString>

console.log(C.Code())                                // return function check(value) {
                                                     //   return (
                                                     //     (typeof value === 'string')
                                                     //   )
                                                     // }

Benchmark

This project maintains benchmarks that measure Ajv and TypeCompiler validate and compile performance. These benchmarks can be run locally by cloning this repository and running npm run benchmark. Results show against Ajv version 8.11.0.

Validate

This benchmark measures validation performance for varying types. You can review this benchmark here.

┌──────────────────┬────────────┬──────────────┬──────────────┬──────────────┐
     (index)       Iterations      Ajv       TypeCompiler  Performance  
├──────────────────┼────────────┼──────────────┼──────────────┼──────────────┤
           Number   16000000   '     73 ms'  '     65 ms'  '    1.12 x' 
           String   16000000   '    281 ms'  '    161 ms'  '    1.75 x' 
          Boolean   16000000   '    302 ms'  '    151 ms'  '    2.00 x' 
             Null   16000000   '    281 ms'  '    149 ms'  '    1.89 x' 
            RegEx   16000000   '    689 ms'  '    550 ms'  '    1.25 x' 
          ObjectA   16000000   '    470 ms'  '    311 ms'  '    1.51 x' 
          ObjectB   16000000   '    667 ms'  '    556 ms'  '    1.20 x' 
            Tuple   16000000   '    362 ms'  '    190 ms'  '    1.91 x' 
            Union   16000000   '    387 ms'  '    209 ms'  '    1.85 x' 
        Recursive   16000000   '   6327 ms'  '   2773 ms'  '    2.28 x' 
          Vector4   16000000   '    362 ms'  '    172 ms'  '    2.10 x' 
          Matrix4   16000000   '    607 ms'  '    418 ms'  '    1.45 x' 
   Literal_String   16000000   '    314 ms'  '    151 ms'  '    2.08 x' 
   Literal_Number   16000000   '    281 ms'  '    147 ms'  '    1.91 x' 
  Literal_Boolean   16000000   '    289 ms'  '    148 ms'  '    1.95 x' 
     Array_Number   16000000   '    475 ms'  '    230 ms'  '    2.07 x' 
     Array_String   16000000   '    463 ms'  '    297 ms'  '    1.56 x' 
    Array_Boolean   16000000   '    521 ms'  '    348 ms'  '    1.50 x' 
    Array_ObjectA   16000000   '  43842 ms'  '  28375 ms'  '    1.55 x' 
    Array_ObjectB   16000000   '  45055 ms'  '  32882 ms'  '    1.37 x' 
      Array_Tuple   16000000   '   1424 ms'  '   1105 ms'  '    1.29 x' 
      Array_Union   16000000   '   3505 ms'  '   1350 ms'  '    2.60 x' 
  Array_Recursive   16000000   ' 117087 ms'  '  42982 ms'  '    2.72 x' 
    Array_Vector4   16000000   '   1500 ms'  '    817 ms'  '    1.84 x' 
    Array_Matrix4   16000000   '   6126 ms'  '   4965 ms'  '    1.23 x' 
└──────────────────┴────────────┴──────────────┴──────────────┴──────────────┘

Compile

This benchmark measures compilation performance for varying types. You can review this benchmark here.

┌──────────────────┬────────────┬──────────────┬──────────────┬──────────────┐
     (index)       Iterations      Ajv       TypeCompiler  Performance  
├──────────────────┼────────────┼──────────────┼──────────────┼──────────────┤
           Number     2000     '    387 ms'  '      7 ms'  '   55.29 x' 
           String     2000     '    340 ms'  '      6 ms'  '   56.67 x' 
          Boolean     2000     '    314 ms'  '      5 ms'  '   62.80 x' 
             Null     2000     '    259 ms'  '      5 ms'  '   51.80 x' 
            RegEx     2000     '    491 ms'  '      7 ms'  '   70.14 x' 
          ObjectA     2000     '   2850 ms'  '     26 ms'  '  109.62 x' 
          ObjectB     2000     '   2989 ms'  '     22 ms'  '  135.86 x' 
            Tuple     2000     '   1283 ms'  '     17 ms'  '   75.47 x' 
            Union     2000     '   1292 ms'  '     16 ms'  '   80.75 x' 
          Vector4     2000     '   1588 ms'  '     12 ms'  '  132.33 x' 
          Matrix4     2000     '    934 ms'  '      7 ms'  '  133.43 x' 
   Literal_String     2000     '    340 ms'  '      5 ms'  '   68.00 x' 
   Literal_Number     2000     '    402 ms'  '      4 ms'  '  100.50 x' 
  Literal_Boolean     2000     '    381 ms'  '      6 ms'  '   63.50 x' 
     Array_Number     2000     '    750 ms'  '      8 ms'  '   93.75 x' 
     Array_String     2000     '    760 ms'  '      6 ms'  '  126.67 x' 
    Array_Boolean     2000     '    796 ms'  '      7 ms'  '  113.71 x' 
    Array_ObjectA     2000     '   3617 ms'  '     26 ms'  '  139.12 x' 
    Array_ObjectB     2000     '   3823 ms'  '     26 ms'  '  147.04 x' 
      Array_Tuple     2000     '   2263 ms'  '     13 ms'  '  174.08 x' 
      Array_Union     2000     '   1725 ms'  '     16 ms'  '  107.81 x' 
    Array_Vector4     2000     '   2445 ms'  '     14 ms'  '  174.64 x' 
    Array_Matrix4     2000     '   1638 ms'  '     11 ms'  '  148.91 x' 
└──────────────────┴────────────┴──────────────┴──────────────┴──────────────┘

Contribute

TypeBox is open to community contribution. Please ensure you submit an open issue before submitting your pull request. The TypeBox project preferences open community discussion prior to accepting new features.