tailwindlabs/tailwindcss

A utility-first CSS framework for rapid UI development.

TypeScript★ 98,543+122 that day#8 on trending

Analyzed November 8, 2026 at 9b2c925 (main) with jscpd v5 in 1.2s.

C57.3/100

Project health165,794 lines of code (L)

Duplication59

6.5% in typescript, rust, javascript, tsx

Dead code89

1.3%

Complexity39

69.5%

The score is jscpd's own --health model: markup, data and text left out, tests kept. The numbers below are the trending scan's.

6.3%duplicated code · 4,038 of 64,103 lines

232clones in code

236code files of 449 scanned

6.65%duplicated over all files · 646 clones

Most complex files

packages/tailwindcss/src/utilities.ts1193 cx
packages/tailwindcss/src/canonicalize-candidates.ts769 cx
packages/tailwindcss/src/utilities.test.ts379 cx
packages/tailwindcss/src/ast.ts365 cx
packages/tailwindcss/src/compat/plugin-api.test.ts359 cx
crates/ignore/src/walk.rs339 cx
packages/tailwindcss/src/index.test.ts323 cx
packages/tailwindcss/src/variants.ts307 cx
packages/tailwindcss/src/candidate.ts237 cx
integrations/utils.ts220 cx

Dead code 1.28% unused · 14 findings

integrations/utils.tsunused-file
packages/tailwindcss/src/source-maps/visualize-source-map.tsunused-file
packages/@tailwindcss-upgrade/src/codemods/template/migrate-arbitrary-variants.tsunused-file
packages/@tailwindcss-cli/src/utils/disposables.tsunused-file
packages/tailwindcss/src/cartesian.tsunused-file
packages/tailwindcss/src/test-utils/custom-serializer.tsunused-file
packages/@tailwindcss-cli/src/utils/resolve.ts:resolveCssIdunused-export
packages/@tailwindcss-upgrade/src/utils/package-version.ts:getPackageVersionunused-export
packages/@tailwindcss-cli/src/utils/renderer.ts:formatDurationunused-export
packages/@tailwindcss-upgrade/src/utils/renderer.ts:formatDurationunused-export

The code number leaves out tests, fixtures, docs, examples, data files, styles, translations and vendored code.

Largest clones in the code

99 lines in 2 placesrust501 tokens

crates/oxide/src/extractor/candidate_machine.rs:201–299crates/oxide/src/extractor/mod.rs:461–559

201fn test_candidate_extraction() {
202    for (input, expected) in [
203        // Simple utility
204        ("flex", vec!["flex"]),
205        // Simple utility with special character(s)
206        ("@container", vec!["@container"]),
207        // Single character utility
208        ("a", vec!["a"]),
209        // Simple utility with dashes
210        ("items-center", vec!["items-center"]),

First 10 of 99 lines.

97 lines in 2 placestypescript480 tokens

packages/@tailwindcss-turbopack/src/index.ts:194–290packages/@tailwindcss-webpack/src/index.ts:194–290

194  DEBUG && I.end(`[@tailwindcss/turbopack] ${path.relative(base, inputFile)}`)
195  callback(null, source)
196  return
197}
198
199// Setup or update scanner if needed
200if (context.scanner === null || rebuildStrategy === 'full') {
201  DEBUG && I.start('Setup scanner')
202  let sources = (() => {
203    // Disable auto source detection

First 10 of 97 lines.

101 lines in 2 placestypescript446 tokens

packages/@tailwindcss-upgrade/src/codemods/template/migrate-theme-to-var.ts:170–270packages/tailwindcss/src/canonicalize-candidates.ts:1078–1178

170}
171
172function substituteFunctionsInValue(
173  ast: ValueParser.ValueAstNode[],
174  handle: (value: string, fallback?: string) => string | null,
175) {
176  walk(ast, (node, ctx) => {
177    if (node.kind === 'function' && node.value === 'theme') {
178      if (node.nodes.length < 1) return
179

First 10 of 101 lines.

7 more

89 lines in 2 placestypescript375 tokens
packages/@tailwindcss-cli/src/utils/args.ts:93–181 packages/@tailwindcss-upgrade/src/utils/args.ts:72–160
77 lines in 2 placestypescript370 tokens
packages/@tailwindcss-turbopack/src/index.ts:1–77 packages/@tailwindcss-webpack/src/index.ts:1–77
70 lines in 2 placesrust367 tokens
crates/oxide/src/extractor/pre_processors/haml.rs:210–279 crates/oxide/src/extractor/pre_processors/slim.rs:67–136
63 lines in 2 placesrust331 tokens
crates/oxide/src/extractor/named_utility_machine.rs:463–525 crates/oxide/src/extractor/utility_machine.rs:274–336
8 lines in 4 placesrust106 tokens
crates/ignore/src/types.rs:15–22 crates/ignore/src/types.rs:33–40 crates/ignore/src/types.rs:50–57 crates/ignore/src/types.rs:70–77
86 lines in 2 placestypescript305 tokens
packages/@tailwindcss-upgrade/src/codemods/template/migrate-theme-to-var.ts:16–101 packages/tailwindcss/src/canonicalize-candidates.ts:901–986
6 lines in 6 placesrust59 tokens
crates/oxide/src/extractor/pre_processors/haml.rs:12–17 crates/oxide/src/extractor/pre_processors/markdown.rs:7–12 crates/oxide/src/extractor/pre_processors/pug.rs:10–15 crates/oxide/src/extractor/pre_processors/ruby.rs:28–33 crates/oxide/src/extractor/pre_processors/slim.rs:10–15and 1 more

Largest clones over all files, tests and data included

36 lines in 10 placesmarkdowndocs and examples244 tokens

README.md:1–36packages/@tailwindcss-browser/README.md:1–36packages/@tailwindcss-cli/README.md:1–36packages/@tailwindcss-node/README.md:1–36packages/@tailwindcss-postcss/README.md:1–36and 5 more

1<p align="center">
2  <a href="https://tailwindcss.com" target="_blank">
3    <picture>
4      <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/tailwindlabs/tailwindcss/HEAD/.github/logo-dark.svg">
5      <source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/tailwindlabs/tailwindcss/HEAD/.github/logo-light.svg">
6      <img alt="Tailwind CSS" src="https://raw.githubusercontent.com/tailwindlabs/tailwindcss/HEAD/.github/logo-light.svg" width="350" height="70" style="max-w…
7    </picture>
8  </a>
9</p>
10

First 10 of 36 lines.

157 lines in 2 placesyamldata files1,089 tokens

.github/workflows/prepare-release.yml:25–181.github/workflows/release.yml:29–185

25  group: ${{ github.workflow }}-${{ github.ref }}
26  cancel-in-progress: true
27
28jobs:
29  build:
30    strategy:
31      matrix:
32        include:
33          # Windows
34          - os: windows-latest

First 10 of 157 lines.

16 lines in 10 placestypescripttests116 tokens

packages/tailwindcss/src/walk.test.ts:8–23packages/tailwindcss/src/walk.test.ts:66–81packages/tailwindcss/src/walk.test.ts:91–106packages/tailwindcss/src/walk.test.ts:116–131packages/tailwindcss/src/walk.test.ts:141–156and 5 more

8test('visit all nodes in an AST', () => {
9  let ast: AstNode[] = [
10    {
11      kind: 'a',
12      nodes: [
13        { kind: 'b', nodes: [{ kind: 'c' }] },
14        { kind: 'd', nodes: [{ kind: 'e', nodes: [{ kind: 'f' }] }] },
15        { kind: 'g', nodes: [{ kind: 'h' }] },
16      ],
17    },

First 10 of 16 lines.

99 lines in 2 placesyamldata files701 tokens
.github/workflows/prepare-release.yml:84–182 .github/workflows/release.yml:88–186
11 lines in 11 placestypescripttests63 tokens
packages/tailwindcss/src/walk.test.ts:368–378 packages/tailwindcss/src/walk.test.ts:430–440 packages/tailwindcss/src/walk.test.ts:457–467 packages/tailwindcss/src/walk.test.ts:484–494 packages/tailwindcss/src/walk.test.ts:511–521and 6 more

By format, code only

Format	Files	Lines	Clones	Duplicated lines	Duplication
typescript	167	42,250	133	2,674	6.33%
rust	57	20,975	96	1,317	6.28%
javascript	9	821	2	29	3.53%
tsx	3	57	1	18	31.58%

By format, all files

Format	Files	Lines	Clones	Duplicated lines	Duplication
typescript	292	139,127	473	8,934	6.42%
rust	61	25,454	138	1,805	7.09%
markdown	17	5,396	15	452	8.38%
yaml	7	1,089	13	421	38.66%
json	33	1,336	3	83	6.21%
javascript	15	1,252	2	29	2.32%
diff	3	212	1	8	3.77%
tsx	3	57	1	18	31.58%
css	2	908	0	0	0%
markup	2	564	0	0	0%

Trending appearances

Day	Rank	Stars	Files	Lines	Clones	All files	Code	Health	Commit
Nov 8, 2026	#8	98,543 (+122)	449	176,571	646	6.65%	6.3%	C 57.3	`9b2c925`

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