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BEM style string

提出詳細

type BEM<B extends string, E extends string[], M extends string[]> =
M[number] extends never ? E[number] extends never ? B : `${B}__${E[number]}` : 
E[number] extends never ? `${B}--${M[number]}` : `${B}__${E[number]}--${M[number]}`
提出日時2025-09-23 14:18:19
問題BEM style string
ユーザーbalckowl
ステータスAccepted
テストケース
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<BEM<'btn', ['price'], []>, 'btn__price'>>,
  Expect<Equal<BEM<'btn', ['price'], ['warning', 'success']>, 'btn__price--warning' | 'btn__price--success' >>,
  Expect<Equal<BEM<'btn', [], ['small', 'medium', 'large']>, 'btn--small' | 'btn--medium' | 'btn--large' >>,
]