By the numbers

Data collected on 2026-04-30 from commit 592a9c4225188994d04c572f5eaac79eebd7dcb3 on main.

A quantitative snapshot of the denoland/deno repository — useful for anyone trying to size up the codebase before diving in.

Size

xychart-beta horizontal
    title "Lines of code by language"
    x-axis ["Rust", "JavaScript", "TypeScript"]
    y-axis "Lines" 0 --> 600000
    bar [504024, 267612, 187813]

Language	Lines	Where
Rust	~504K	cli/, runtime/, ext/, libs/, tests/
JavaScript	~268K	Extension JS in ext/*/ (e.g., Node polyfills, web platform JS), tests/
TypeScript	~188K (excluding tests/)	LSP infra, type definitions, tools/, runtime polyfills

The repo as a whole has ~922 Rust files, ~2,858 TypeScript files, and ~1,132 JavaScript files (excluding .git/).

Workspace shape

Component	Count
Cargo workspace members	~70 crates
ext/ extension crates	31
libs/ reusable crates	24
cli/ member crates	4 (cli, cli/lib, cli/rt, cli/snapshot)
runtime/ member crates	4 (runtime, runtime/features, runtime/permissions, runtime/subprocess_windows)
tests/ member crates	9

Largest source files

The 10 longest Rust files by line count:

File	Lines
tests/integration/lsp_tests.rs	19,909
cli/args/flags.rs	15,873
runtime/permissions/lib.rs	10,921
libs/npm/resolution/graph.rs	9,478
cli/lsp/tsc.rs	7,137
libs/config/workspace/mod.rs	6,815
libs/node_shim/lib.rs	5,006
cli/lsp/language_server.rs	4,580
ext/napi/js_native_api.rs	4,135
libs/eszip/v2.rs	4,018

The size of cli/args/flags.rs reflects Deno's CLI surface — every subcommand and every flag is parsed there.

Inside cli/

The 10 longest top-level files in cli/:

File	Lines
cli/module_loader.rs	1,668
cli/factory.rs	1,441
cli/lib.rs	1,265
cli/file_fetcher.rs	1,234
cli/graph_util.rs	1,195
cli/type_checker.rs	1,138
cli/http_util.rs	841
cli/npm.rs	736
cli/worker.rs	659
cli/cdp.rs	~500

Activity

• Total commits on main: ~15,755
• First commit: 2018-05-13 (8 years of history)
• Most recent commit (at snapshot): 2026-04-29
• Active git authors (all-time, by commit email): 1,239
• Bot-attributed commits (denobot, dependabot, github-actions): 526 (3.3% of total). This is a lower bound on automated work — inline AI tools that don't leave a trail in git history are not counted.

Top contributors since 2024-01-01 (by commit count)

These are the people most likely to know the recent state of the codebase. Listed for context; the per-page byline is what you actually want when looking for an owner of a specific subsystem.

#	Author
1	Bartek Iwańczuk
2	David Sherret
3	Divy Srivastava
4	Nathan Whitaker
5	Nayeem Rahman
6	Asher Gomez
7	Yoshiya Hinosawa
8	Leo Kettmeir
9	Marvin Hagemeister
10	Luca Casonato

Code health signals

• TODO/FIXME/HACK comments in Rust: ~480
• Lint plugins: 1 dedicated to project-specific rules (tools/lint_plugins/)
• Generated workflow files in .github/workflows/: 11 YAML files generated from sibling .ts scripts (the source of truth)

Releases

• Tagged releases: hundreds, from v0.0.1 up through the current v2.7.x line. The earliest tag is v0.0.1, v1.0 was tagged 2020-05-14, v2.0 was 2024-10-08, v2.5.0 was 2025-09-10, v2.7.0 was 2026-02-25.

Cross-cutting stats

Metric	Value
Workspace dependencies pinned in Cargo.toml	~30 deno_* crates plus a long list of third-party deps
Submodules	a handful (test fixtures, WPT, std lib, node-compat)
Tests directories	tests/specs/, tests/unit/, tests/unit_node/, tests/wpt/, tests/node_compat/, tests/integration/, tests/napi/, tests/ffi/

For history and trajectory, see Lore. For trivia, see Fun facts.