Flow type description of JSON Schema (WIP)

json-schema.js

/* @flow */

type NonNegativeInt = number
type PositiveNumber = number
type Regex = string

type SchemaType = {
  description?: string,
}

type SchemaObject = {
  ...SchemaType,
  type: "object",
  maxProperties?: NonNegativeInt,
  minProperties?: NonNegativeInt,
  required?: string[],
  properties: {[string]: Schema},
  patternProperties?: {[Regex]: Schema},
  additionalProperties?: Schema,
}

type SchemaArray = {
  ...SchemaType,
  type: "array",
  items?: Schema | Schema[],
  additionalItems?: Schema,
  maxItems?: NonNegativeInt,
  minItems?: NonNegativeInt,
  uniqueItems?: boolean,
  contains?: Schema,
}

type SchemaString = {
  ...SchemaType,
  type: "string",
  maxLength?: NonNegativeInt,
  minLength?: NonNegativeInt,
  pattern?: Regex,
}
  
type SchemaNumber = {
  ...SchemaType,
  type: "number",
  multipleOf?: PositiveNumber,
  maximum?: number,
  exclusiveMaximum?: number,
  minimum?: number,
  exclusiveMinimum?: number,
}

type SchemaBoolean = {
  ...SchemaType,
  type: "boolean"
}

type SchemaNull = {
  ...SchemaType,
  type: "null"
}

type Schema =
  | SchemaObject
  | SchemaArray
  | SchemaString
  | SchemaNumber
  | SchemaBoolean
  | SchemaNull

type SchemaRoot = {
  ...Schema,
  "$schema": string,
  "$id": string,
  title: string,
}