By the numbers

Data collected on 2026-04-30 against commit 3310eea4 of main.

A snapshot of the codebase from a few quantitative angles. Per-person stats are intentionally not included — the maintainers page handles ownership separately. For history and narrative, see lore.

Size

The repo holds 12 public packages under packages/ plus 5 private workspaces under packages-private/. Source totals across the public packages:

Package	Source files	Source lines	Test files
runtime-core	65	20,714	45
compiler-core	30	11,011	21
compiler-sfc	30	8,113	20
runtime-dom	17	5,038	16
reactivity	13	3,898	16
compiler-ssr	17	2,249	16
compiler-dom	16	1,417	13
server-renderer	15	1,321	18
shared	16	1,088	6
runtime-test	5	405	1
vue-compat	6	208	12
vue	3	146	20

xychart-beta horizontal
    title "Source lines per package (TypeScript)"
    x-axis ["vue", "vue-compat", "runtime-test", "shared", "server-renderer", "compiler-dom", "compiler-ssr", "reactivity", "runtime-dom", "compiler-sfc", "compiler-core", "runtime-core"]
    y-axis "Lines"
    bar [146, 208, 405, 1088, 1321, 1417, 2249, 3898, 5038, 8113, 11011, 20714]

Repo-wide totals:

• 277 TypeScript files in packages/*/src/.
• 195 Vitest spec files across packages/*/__tests__/.
• 204 TypeScript files inside __tests__/ directories overall.
• 50 dev-dependencies in the root package.json.

Activity

The full history runs from September 19, 2018 (commit 3a86b6f) to April 22, 2026 (commit 3310eea4). 7,018 commits total. Distribution by year:

xychart-beta horizontal
    title "Commits per year"
    x-axis ["2018", "2019", "2020", "2021", "2022", "2023", "2024", "2025", "2026 YTD"]
    y-axis "Commits"
    bar [223, 1051, 1746, 1112, 478, 867, 1027, 372, 142]

The 2020 spike covers the run-up to and stabilization of the Vue 3.0 release. 2022's dip and 2023's rebound coincide with the rise of the SFC-Studio/Volar ecosystem outside the core repo and the introduction of the <script setup> macros (defineModel, definePropsDestructure) in 3.4 and 3.5.

In the last 90 days (Feb–Apr 2026), the most-touched files are package manifests during release prep (packages/*/package.json). Among source files, the leaders were in compiler-sfc and runtime-core.

Churn hotspots

All-time most-changed source files (excluding package.json):

File	Commits touching it
packages/runtime-core/src/component.ts	340
packages/compiler-sfc/src/compileScript.ts	305
packages/runtime-core/src/renderer.ts	303

These three files are the biggest in the codebase by complexity, and each one is the spine of its area:

• component.ts is where every Composition/Options API path eventually lands.
• compileScript.ts is the <script setup> transform.
• renderer.ts is the patch loop.

Touching them is a strong signal that something nontrivial is happening; reviewers tend to be especially careful with PRs against these three.

Bot-attributed commits

7,018 total commits. Of those:

• 1,046 commits have a bot in the author field ([bot] / dependabot / github-actions / renovate). About 15% of all commits.
• 558 commits carry a Co-authored-by: trailer mentioning a bot.

These numbers are a lower bound on AI/automation involvement. Inline tools like Copilot, Cursor, or Codeium leave no trace in git log. The high bot-author share reflects this repo's heavy use of Renovate for dependency updates (configured in .github/renovate.json5).

Test-to-code ratio

Across the public packages, the ratio of test files to source files is roughly 0.7 (195 test files : 277 source files). It varies by package — vue-compat is over 2.0 (12 tests for 6 source files), while compiler-core is around 0.7 and runtime-core is around 0.69.

Complexity

Largest single source files (excluding tests and generated data):

File	Bytes
packages/runtime-core/src/renderer.ts	~74 KB
packages/compiler-sfc/src/script/resolveType.ts	~60 KB
packages/runtime-dom/src/jsx.ts	~48 KB
packages/compiler-sfc/src/compileScript.ts	~45 KB
packages/compiler-core/src/tokenizer.ts	~36 KB
packages/runtime-core/src/component.ts	~35 KB
packages/runtime-core/src/componentOptions.ts	~33 KB
packages/runtime-core/src/hydration.ts	~30 KB
packages/compiler-core/src/parser.ts	~30 KB
packages/compiler-core/src/codegen.ts	~28 KB
packages/compiler-core/src/transforms/transformElement.ts	~28 KB

renderer.ts is intentionally one big file — splitting it across modules would force the tight processX/mountX/patchX paths to bounce through indirection, which the maintainers have explicitly resisted on perf grounds.

TODOs and FIXMEs

grep -rE 'TODO|FIXME|HACK|XXX' against packages/**/*.ts produces 32 matches. Vue's source is unusually low on accumulated debt markers compared to similarly sized repos.

Dependencies

Root devDependencies count: 50. Notable runtime dependencies (per-package):

• compiler-sfc depends on @babel/parser, magic-string, estree-walker, postcss, source-map-js.
• server-renderer is dependency-free apart from the @vue/* workspace packages.
• reactivity, runtime-core, runtime-dom, compiler-core, compiler-dom, compiler-ssr have only @vue/shared and (for runtimes) @vue/reactivity as runtime dependencies.

This dependency hygiene is one of the reasons the prod runtime bundle stays around 35 KB minified.