Project structure

slackcli/
├── src/
│   ├── index.ts                  CLI entry point; registers command groups
│   ├── version.ts                App version (build-time define, else package.json)
│   ├── commands/                 One file per command group
│   │   ├── auth.ts
│   │   ├── canvas.ts
│   │   ├── conversations.ts
│   │   ├── files.ts
│   │   ├── messages.ts
│   │   ├── saved.ts
│   │   ├── search.ts
│   │   └── update.ts
│   ├── lib/                      All logic; tests live beside each file
│   └── types/index.ts            Shared interfaces
├── scripts/build.ts              Compile wrapper that injects __APP_VERSION__
├── .github/workflows/            CI, tests, release, policy checks
├── .github/ISSUE_TEMPLATE/       Issue forms; blank issues are disabled
├── .github/PULL_REQUEST_TEMPLATE.md  Linked-issue reference + checklist
├── .pre-commit-config.yaml       Local checks mirroring CI
├── CLAUDE.md                     Repository constitution + architecture notes
├── CONTRIBUTING.md               Contribution policy
└── dist/                         Build output (gitignored)

src/commands/

Each file exports a create<Group>Command(): Command factory that src/index.ts registers. They parse flags, call into src/lib/, print, and set the exit code. They hold no Slack API knowledge.

File	Subcommands
auth.ts	login, login-browser, login-auto, list, set-default, remove, logout, extract-tokens, parse-curl
canvas.ts	list, read
conversations.ts	list, read, get, unread
files.ts	info, read, download
messages.ts	send, react, edit, draft
saved.ts	list
search.ts	messages, channels, people
update.ts	(default action), check

src/lib/

Module	Responsibility
slack-client.ts	The Slack API abstraction. Dispatches every call to standardRequest() or browserRequest() by auth type, through the shared rate limiter.
auth.ts	Login orchestration; returns a configured SlackClient. The only place that decides a token is valid.
workspaces.ts	Multi-workspace persistence, profile-key derivation and resolution.
browser-auth.ts	Captures xoxd/xoxc from a signed-in browser; pure extractors are exported for tests.
browser-launcher.ts	Finds and launches a local Chromium-family browser; owns the profile directory.
cdp-client.ts	Minimal Chrome DevTools Protocol client over Bun’s WebSocket.
curl-parser.ts	Extracts tokens from a DevTools cURL command.
slack-url-parser.ts	Slack URL / permalink / timestamp normalisation.
mrkdwn.ts	Slack mrkdwn → rich_text blocks (drafts).
canvas-parser.ts	Slack canvas HTML → Markdown.
rate-limiter.ts	Concurrency cap and minimum interval shared by every Slack API call.
message.ts	Fetch one message by channel + timestamp, per auth type.
saved.ts	Resolves saved-item pointers into messages, channels, and users.
unread.ts	Fetches and normalises unread channel data across both auth types.
formatter.ts	Chalk-coloured renderers, status helpers, and writeJson().
clipboard.ts	Cross-platform clipboard read (pbpaste / PowerShell / xclip / xsel).
interactive-input.ts	Multi-line terminal input (double-Enter or Ctrl-D).
updater.ts	Self-update via GitHub releases, with SHA-256 verification.

src/types/index.ts

Every shared interface: AuthType, TokenType, StandardAuthConfig, BrowserAuthConfig, WorkspaceConfig, WorkspacesData, SlackChannel, SlackUser, SlackFile, SlackMessage, SlackAuthTestResponse, SavedItem, SearchMatch, ChannelSearchResult, PeopleSearchResult, UnreadChannel, SlackCanvas, and the per-command option interfaces.

WorkspaceConfig is a discriminated union on auth_type — narrowing it is what makes the dual-auth split type-safe rather than a runtime string check.

Tests

Tests sit beside the code they cover (src/lib/curl-parser.test.ts next to src/lib/curl-parser.ts). See testing.