tailwind-ctp-intellisense/packages/tailwindcss-language-service/src/util/lazy.ts

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// https://www.codementor.io/@agustinchiappeberrini/lazy-evaluation-and-javascript-a5m7g8gs3
export interface Lazy<T> {
(): T
isLazy: boolean
}
export const lazy = <T>(getter: () => T): Lazy<T> => {
let evaluated: boolean = false
let _res: T = null
const res = <Lazy<T>>function (): T {
if (evaluated) return _res
_res = getter.apply(this, arguments)
evaluated = true
return _res
}
res.isLazy = true
return res
}