extra-utils

extra-utils

Utilities for JavaScript and Typescript.

Install

npm install --save extra-utils
# or
yarn add extra-utils

API

Array

function isArray<T>(val: unknown): val is Array<T>
function isntArray<T>(val: T): val is Exclude<T, Array<unknown>>

function isEmptyArray(val: unknown[]): boolean
function isntEmptyArray<T>(val: T[]): val is NonEmptyArray<T>

Boolean

function isBoolean(val: unknown): val is boolean
function isntBoolean<T>(val: unknown): val is Exclude<T, boolean>

function isFalsy(val: unknown): val is Falsy
function isntFalsy<T>(val: T): val is Exclude<T, Falsy>

JSON

function isJson(val: unknown): Json
function isntJson<T>(val: T): val is Exclude<T, Json>

function isJsonable<T extends Json>(val: unknown): val is Jsonable<T>
function isntJsonable<T>(val: T): val is Exclude<T, Jsonable<Json>>

Nullish

function isNullish(val: unknown): val is Nullish
function isntNullish<T>(val: T): val is Exclude<T, Nullish>

function isNull(val: unknown): val is null
function isntNull<T>(val: T): val is Exclude<T, null>

function isUndefined(val: unknown): val is undefined
function isntUndefined<T>(val: T): val is Exclude<T, undefined>

Number

function isNumber(val: unknown): val is number
function isntNumber<T>(val: T): val is Exclude<T, number>

function isFinite(val: number): boolean
function isPositiveInfinity(val: number): boolean
function isNegativeInfinity(val: number): boolean

function isNaN(val: number): boolean
function isntNaN(val: number): boolean

function isBigInt(val: unknown): val is bigint
function isntBigInt<T>(val: T): val is Exclude<T, bigint>

Object

function isObject(
  val: unknown
): val is object & Record<string | symbol | number, unknown>
function isntObject<T>(
  val: T
): val is Exclude<T, object & Record<string | symbol | number, unknown>>

function isPlainObject(
  val: unknown
): val is object & Record<string | symbol | number, unknown>
function isntPlainObject<T>(
  val: T
): val is Exclude<T, object & Record<string | symbol | number, unknown>>

function isEmptyObject(val: object): boolean
function isntEmptyObject(val: object): boolean

String

function isString(val: unknown): val is string
function isntString<T>(val: T): val is Exclude<T, string>

function isChar(val: unknown): val is string
function isntChar(val: unknown): boolean

function isURLString(text: string): boolean
function isntURLString(text: string): boolean

removeExtraIndents

function removeExtraIndents(
  text: string
, options?: { ignoreBlankLines: boolean = false }
): string

Example:

removeExtraIndents(`
  hello

  world
`, { ignoreBlankLines: true })
//   '\n'
// + 'hello' + '\n'
// + '\n'
// + 'world' + '\n'

removeBlankLines

function removeBlankLines(text: string): string

Example:

removeBlankLines(
  '\n'
+ 'hello' + '\n'
+ '\n'
+ 'world' + '\n'
+ '\n'
)
//   'hello' + '\n'
// + 'world'

removeLeadingBlankLines

function removeLeadingBlankLines(text: string): string

Example:

removeLeadingBlankLines(
  '  ' + '\n'
+ 'a' + '\n'
+ '  '
)
//   'a' + '\n'
// + '  '

removeTrailingBlankLines

function removeTrailingBlankLines(text: string): string

Example:

removeTrailingBlankLines(
  '  ' + '\n'
+ 'a' + '\n'
+ '  '
)
//   '  ' + '\n'
// + 'a'

Enum

function inEnum<T>(val: unknown, _enum: object): val is T
function notInEnum<T, U>(val: T, _enum: object): val is Exclude<T, U>

Date

function isDate(val: unknown): val is Date
function isntDate<T>(val: T): val is Exclude<T, Date>

Function

function isFunction<T extends Function = (...args: any[]) => any>(
  val: unknown
): val is T
function isntFunction<T>(val: T): val is Exclude<T, Function>

RegExp

function isRegExp(val: unknown): val is RegExp
function isntRegExp<T>(val: T): val is Exclude<T, RegExp>

Symbol

function isSymbol(val: unknown): val is symbol
function isntSymbol<T>(val: T): val is Exclude<T, symbol>

pipe

function pipe<A, B, C, D, E, F, G, H>(
  value: A
, ...operators: [
    (value: A) => B
  , (value: B) => C
  , (value: C) => D
  , (value: D) => E
  , (value: E) => F
  , (value: F) => G
  , (value: G) => H
  ]
): H
function pipe<A, B, C, D, E, F, G>(
  value: A
, ...operators: [
    (value: A) => B
  , (value: B) => C
  , (value: C) => D
  , (value: D) => E
  , (value: E) => F
  , (value: F) => G
  ]
): G
function pipe<A, B, C, D, E, F>(
  value: A
, ...operators: [
    (value: A) => B
  , (value: B) => C
  , (value: C) => D
  , (value: D) => E
  , (value: E) => F
  ]
): F
function pipe<A, B, C, D, E>(
  value: A
, ...operators: [
    (value: A) => B
  , (value: B) => C
  , (value: C) => D
  , (value: D) => E
  ]
): E
function pipe<A, B, C, D>(
  value: A
, ...operators: [
    (value: A) => B
  , (value: B) => C
  , (value: C) => D
  ]
): D
function pipe<A, B, C>(
  value: A
, ...operators: [
    (value: A) => B
  , (value: B) => C
  ]
): C
function pipe<A, B>(
  value: A
, ...operators: [
    (value: A) => B
  ]
): B
function pipe<T, U>(
  value: T
, ...operators: Array<(value: unknown) => unknown>
): U