Function resolveFlag

packages/effect/src/unstable/cli/internal/parser.ts:348–380

(
  token: FlagToken,
  registry: FlagRegistry
)

const getFlagName = (t: FlagToken): string => t._tag === "LongOption" ? t.name : t.flag

const resolveFlag = (
  token: FlagToken,
  registry: FlagRegistry
): ResolvedFlag | undefined => {
  const tokenName = getFlagName(token)
  const direct = registry.index.get(tokenName)
  if (direct && direct.name === tokenName) {
    return {
      param: direct,
      negated: false
    }
  }

  if (token._tag === "LongOption" && token.name.startsWith("no-")) {
    const canonicalName = token.name.slice(3)
    const param = registry.index.get(canonicalName)
    if (param && param.name === canonicalName && Primitive.isBoolean(param.primitiveType)) {
      return {
        param,
        negated: true
      }
    }
  }

  if (direct) {
    return {
      param: direct,
      negated: false
    }
  }

  return undefined
}

const invalidNegatedFlagValue = (
  token: FlagToken,