typing

npm install @orioro/typing
yarn add @orioro/typing

Simple type validation utilities. Meant for checking types of argument input in microlibraries. For more complex use cases, such as object property or array item validation, see either:

• @orioro/expression - https://github.com/orioro/node-expression
• @orioro/validate - https://github.com/orioro/node-validate
• @orioro/schema - https://github.com/orioro/schema

API Docs

• _getType()
• _isType()
• anyType(metadata)
• singleType(type, metadata)
• oneOfTypes(types, metadata)
• enumType(values, metadata)
• indefiniteArrayOfType(itemType, metadata)
• indefiniteObjectOfType(propertyType, metadata)
• tupleType(items, metadata)
• objectType(properties, metadata)
• castTypeSpec(value, metadata)
• CORE_TYPES
• typing(types)
• isType(expectedType, value)
• validateType(expectedType, value)
• getType(value)
• _validateType()

anyType(metadata)

Constant to be used to express that any type is allowed:

• isType always returns true

• validateType never throws

• metadata {Object}

singleType(type, metadata)

• type {String}
• metadata {Object}
• Returns: {SingleTypeSpec}

oneOfTypes(types, metadata)

• types {TypeSpec[]}
• metadata {Object}
• Returns: {OneOfTypesSpec}

enumType(values, metadata)

• values {*[]}
• metadata {Object}
• Returns: {EnumTypeSpec}

indefiniteArrayOfType(itemType, metadata)

• itemType {TypeSpec}
• metadata {Object}
• Returns: {IndefiniteArrayOfTypeSpec}

indefiniteObjectOfType(propertyType, metadata)

• propertyType {TypeSpec}
• metadata {Object}
• Returns: {IndefiniteObjectOfTypeSpec}

tupleType(items, metadata)

• items {TypeSpec[]}
• metadata {Object}
• Returns: {TupleTypeSpec}

objectType(properties, metadata)

• properties {Object}
• metadata {Object}
• Returns: {ObjectTypeSpec}

castTypeSpec(value, metadata)

Attempts to cast a value into a TypeSpec object:

• if an ObjectTypeSpec, simply return the value itself

• if a string, converts it into a SingleTypeSpec

• if an array, converts it into an OneOfTypesSpec

• if a plain object, converts it into an ObjectTypeSpec

• otherwise returns null upon casting failure

• value {*}

• metadata {Object}

• Returns: {TypeSpec | null}

CORE_TYPES

typing(types)

• types {TypeAlternatives | TypeMap}
• Returns: {{ isType, validateType, getType }}

isType(expectedType, value)

• expectedType {TypeSpec}
• value {*}
• Returns: {boolean}

validateType(expectedType, value)

If typing is invalid, throws TypeError. Returns nothing (undefined) otherwise.

• expectedType {string[] | string}
• value {*}
• Returns: {undefined}

getType(value)

• value {*}
• Returns: type {string} Possible values for default configuration:
  • string
  • regexp
  • number
  • bigint
  • nan
  • null
  • undefined
  • boolean
  • function
  • object
  • array
  • date
  • symbol
  • map
  • set
  • weakmap
  • weakset

Private methods

_getType()

_isType()

_validateType()