TypeScript utils

common.ts

export type Nully = null | undefined

export type Falsy = false | 0 | '' | Nully

isNotNully.ts

import {Nully} from './common.ts'

export const isNotNully = <T>(value: T): value is Exclude<T, Nully> => value != null && value != undefined

isTruthy.ts

import {Falsy} from './common.ts'

export const isTruthy = <T>(value: T): value is Exclude<T, Falsy> => !!value