Function createFlagRegistry

packages/effect/src/unstable/cli/internal/parser.ts:232–252

(params: ReadonlyArray<FlagParam>)

 * @internal
 */
export const createFlagRegistry = (params: ReadonlyArray<FlagParam>): FlagRegistry => {
  const index = new Map<string, FlagParam>()

  for (const param of params) {
    if (index.has(param.name)) {
      throw new Error(`Duplicate flag name "${param.name}" in command definition`)
    }
    index.set(param.name, param)

    for (const alias of param.aliases) {
      if (index.has(alias)) {
        throw new Error(
          `Duplicate flag/alias "${alias}" in command definition (conflicts with "${index.get(alias)!.name}")`
        )
      }
      index.set(alias, param)
    }
  }

  return { params, index }
}

const buildSubcommandIndex = (
  subcommands: Command.Any["subcommands"]