Systems

The "systems" lens covers the major architectural components of Deno that don't naturally fit into a single workspace package. These are emergent subsystems that span multiple files (and sometimes crates) but make sense to read about as a unit.

Page	What's covered
CLI	Flag parsing, subcommand dispatch, CliFactory dependency wiring, the entry point flow
Runtime	The deno_runtime crate: MainWorker, WebWorker, snapshots, bootstrap
LSP	The deno lsp server in cli/lsp/ — diagnostics, completions, refactor, the bundled tsc IPC
Module loading	cli/module_loader.rs, graph construction, transpilation, source maps
Permissions	runtime/permissions/ — categories, the PermissionsContainer, prompts
Type checking	cli/type_checker.rs, the bundled tsc, the tsgo IPC client

If you're looking for individual workspace crates instead, see Packages. For per-extension docs, see Extensions.