By the numbers

A quantitative snapshot of the tldraw monorepo. Data collected on 2026-04-30 against main at commit 15caa2104.

Size

The codebase is dominated by TypeScript and TSX. Tests are extensive — *.test.ts and *.test.tsx together hold roughly the same line count as production source.

xychart-beta horizontal
    title "Lines by file type (under packages/, apps/, internal/, templates/)"
    x-axis ["TypeScript (.ts, non-test)", "TSX (.tsx, non-test)", "Tests (.test.ts/.tsx)", "MDX (docs)", "CSS"]
    y-axis "Lines"
    bar [203990, 102795, 109766, 24401, 14918]

Category	Files (approx.)	Lines
TypeScript (production)	~1500	203,990
TSX (production)	~440	102,795
Test files (*.test.ts/*.test.tsx)	352	109,766
MDX (docs content)	—	24,401
CSS	83	14,918

Workspace count:

• 19 packages under packages/
• 11 apps/workers under apps/ (counting each subdirectory of apps/dotcom/ and apps/vscode/ separately)
• 12 starter templates under templates/
• 3 internal packages under internal/ (config, health-worker, apps-script)

Activity

• Total commits on main: 5,707 since 2021-05-09.
• Last 365 days: 1,501 commits.
• Last 90 days: 469 commits across 469 days of history (≈5.2 commits/day).
• Bot-attributed commits: 166 commits authored by accounts ending in [bot] (huppy-bot[bot], dependabot[bot], github-actions[bot]). This is a lower bound on AI- or automation-assisted work; inline AI tooling (Copilot-style) leaves no git trace.

Most-changed files in the last 90 days

Rank	File	Commits
1	yarn.lock	50
2	packages/tldraw/api-report.api.md	41
3	packages/editor/api-report.api.md	32
4	apps/docs/content/releases/next.mdx	32
5	packages/editor/src/lib/editor/Editor.ts	28
6	internal/scripts/deploy-dotcom.ts	26
7	packages/tldraw/src/index.ts	20
8	packages/editor/package.json	19
9	packages/tldraw/package.json	19
10	packages/create-tldraw/package.json	19
11	apps/dotcom/zero-cache/flyio-replication-manager.template.toml	19
12	apps/dotcom/client/package.json	19
13	apps/dotcom/zero-cache/flyio-view-syncer.template.toml	17

Generated files (api-report.api.md, next.mdx) and lockfile churn dominate. After excluding those, the actual hot file is packages/editor/src/lib/editor/Editor.ts.

Complexity

• Largest source file: packages/editor/src/lib/editor/Editor.ts at over 11,500 lines. The whole runtime API hangs off this class.
• packages/tldraw/src/index.ts is the SDK entry point and is itself ~28 KB / 600+ lines of re-exports.
• packages/store/src/lib/Store.ts is ~1,500 lines and the heart of the reactive database.
• packages/sync-core/src/lib/TLSyncRoom.ts is ~1,300 lines; TLSocketRoom.ts is ~1,000 lines; TLSyncClient.ts is ~1,000 lines. Multiplayer sync is non-trivial.
• packages/tldraw/src/lib/ui/components/menu-items.tsx alone is ~20 KB of menu wiring.
• TODO/FIXME/HACK count: 52 occurrences in TypeScript/TSX under packages/ and apps/. Modest for a codebase of this size.

Dependencies

• Runtime peer dependencies for @tldraw/editor: react ^18.2.0 || ^19.2.1, react-dom ^18.2.0 || ^19.2.1. Internal: @tiptap/*, idb, rbush, eventemitter3, classnames, is-plain-object.
• Build/devtools at the root: lazyrepo, oxlint, oxfmt, vitest, @microsoft/api-extractor, tsx, typescript ^5.8.3, vercel.
• Resolutions in package.json patch domino and @microsoft/tsdoc, and replace canvas with an empty package (pdfjs pulls it as an optional dep that we do not need in installs).

Tooling reach

• GitHub workflows: 33 workflow files under .github/workflows/. They cover deploy (deploy-dotcom.yml, deploy-bemo.yml, deploy-analytics.yml, deploy-mcp-app.yml), Playwright (playwright-dotcom.yml, playwright-examples.yml, playwright-perf.yml), publishing (publish-canary.yml, publish-new.yml, publish-patch.yml, publish-templates.yml, publish-vscode-extension.yml, publish-editor-extensions.yml), i18n (i18n-upload-strings.yml, i18n-download-strings.yml), preview deploys, hot-fixes, and docs/release notes automation.
• Husky hooks under .husky/ enforce lint-staged via oxfmt.

Releases

• The repo has 65+ versioned tags. The most recent are v4.5.10, v4.5.9, … through v4.5.0 and earlier 4.x/3.x lines.
• The current SDK version is 4.5.10 (packages/editor/package.json).

How to read these numbers

Numbers come from git log, wc -l, and find against the worktree at the commit listed above. They will drift on every commit. Re-generate this page with wiki to refresh.