fix: add TypeScript decorator support to SWC transform #769

ijjk · 2026-01-12T20:42:38Z

validates #757

Enable decorator parsing in SWC configuration to support codebases using TypeScript decorators (TypeORM, NestJS, class-validator, custom decorators). Without this fix, projects importing files with decorators fail with: "Unexpected token `@`. Expected identifier..." syntax errors. Changes: - Add `decorators: true` to parser options for TypeScript and ECMAScript - Add `legacyDecorator: true` for TypeScript's experimentalDecorators - Add `decoratorMetadata: true` for emitDecoratorMetadata support

Read experimentalDecorators and emitDecoratorMetadata from tsconfig.json to match Next.js behavior. Decorators are now only enabled when explicitly configured in the project's tsconfig. - Add getDecoratorOptionsForDirectory() to read tsconfig settings - Update applySwcTransform and Next.js loader to use tsconfig options - Handle JSONC format (comments, trailing commas) in tsconfig parsing

Replace manual regex-based JSONC parsing with json5 library for more robust handling of comments and trailing commas in tsconfig.json files.

changeset-bot · 2026-01-12T20:42:42Z

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vercel · 2026-01-12T20:42:44Z

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Project	Deployment	Review	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview, Comment	Jan 12, 2026 9:28pm
example-nextjs-workflow-webpack	Ready	Preview, Comment	Jan 12, 2026 9:28pm
example-workflow	Ready	Preview, Comment	Jan 12, 2026 9:28pm
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github-actions · 2026-01-12T20:42:51Z

🧪 E2E Test Results

❌ Some tests failed

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	363	0	11	374
✅ 💻 Local Development	332	0	8	340
✅ 📦 Local Production	332	0	8	340
✅ 🐘 Local Postgres	332	0	8	340
✅ 🪟 Windows	34	0	0	34
❌ 🌍 Community Worlds	132	16	0	148
Total	1525	16	35	1576

❌ Failed Tests

🌍 Community Worlds (16 failed)

mongodb (1 failed):

webhookWorkflow

starter (14 failed):

addTenWorkflow
addTenWorkflow
error handling error propagation workflow errors nested function calls preserve message and stack trace
error handling error propagation workflow errors cross-file imports preserve message and stack trace
error handling error propagation step errors basic step error preserves message and stack trace
error handling error propagation step errors cross-file step error preserves message and function names in stack
error handling retry behavior regular Error retries until success
error handling retry behavior FatalError fails immediately without retries
error handling catchability FatalError can be caught and detected with FatalError.is()
hookCleanupTestWorkflow - hook token reuse after workflow completion
stepFunctionPassingWorkflow - step function references can be passed as arguments (without closure vars)
stepFunctionWithClosureWorkflow - step function with closure variables passed as argument
spawnWorkflowFromStepWorkflow - spawning a child workflow using start() inside a step
pathsAliasWorkflow - TypeScript path aliases resolve correctly

turso (1 failed):

webhookWorkflow

Details by Category

✅ ▲ Vercel Production

App	Passed	Skipped
✅ astro	33	1
✅ example	33	1
✅ express	33	1
✅ fastify	33	1
✅ hono	33	1
✅ nextjs-turbopack	33	1
✅ nextjs-webpack	33	1
✅ nitro	33	1
✅ nuxt	33	1
✅ sveltekit	33	1
✅ vite	33	1

✅ 💻 Local Development

App	Passed	Skipped
✅ astro-stable	33	1
✅ express-stable	33	1
✅ fastify-stable	33	1
✅ hono-stable	33	1
✅ nextjs-turbopack-stable	34	0
✅ nextjs-webpack-stable	34	0
✅ nitro-stable	33	1
✅ nuxt-stable	33	1
✅ sveltekit-stable	33	1
✅ vite-stable	33	1

✅ 📦 Local Production

App	Passed	Skipped
✅ astro-stable	33	1
✅ express-stable	33	1
✅ fastify-stable	33	1
✅ hono-stable	33	1
✅ nextjs-turbopack-stable	34	0
✅ nextjs-webpack-stable	34	0
✅ nitro-stable	33	1
✅ nuxt-stable	33	1
✅ sveltekit-stable	33	1
✅ vite-stable	33	1

✅ 🐘 Local Postgres

App	Passed	Skipped
✅ astro-stable	33	1
✅ express-stable	33	1
✅ fastify-stable	33	1
✅ hono-stable	33	1
✅ nextjs-turbopack-stable	34	0
✅ nextjs-webpack-stable	34	0
✅ nitro-stable	33	1
✅ nuxt-stable	33	1
✅ sveltekit-stable	33	1
✅ vite-stable	33	1

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	34	0	0

❌ 🌍 Community Worlds

App	Passed	Failed
✅ mongodb-dev	3	0
❌ mongodb	33	1
✅ redis-dev	3	0
✅ redis	34	0
✅ starter-dev	3	0
❌ starter	20	14
✅ turso-dev	3	0
❌ turso	33	1

📋 View full workflow run

github-actions · 2026-01-12T20:42:51Z

📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🌐 Starter	🥇 Next.js (Turbopack)	0.039s (+20.2% 🔺)	1.014s (~)	0.975s	10	1.00x
💻 Local	Next.js (Turbopack)	0.039s (-2.8%)	1.014s (~)	0.975s	10	1.01x
💻 Local	Nitro	0.042s (~)	1.007s (~)	0.965s	10	1.09x
🌐 Redis	Next.js (Turbopack)	0.042s (+19.6% 🔺)	1.017s (~)	0.975s	10	1.09x
💻 Local	Express	0.045s (-5.9% 🟢)	1.008s (~)	0.963s	10	1.17x
🌐 Turso	Next.js (Turbopack)	0.078s (-27.5% 🟢)	1.013s (~)	0.936s	10	2.01x
🌐 MongoDB	Next.js (Turbopack)	0.124s (-3.4%)	1.015s (~)	0.891s	10	3.21x
🐘 Postgres	Next.js (Turbopack)	0.161s (+32.4% 🔺)	1.021s (~)	0.860s	10	4.18x
🐘 Postgres	Nitro	0.321s (+24.8% 🔺)	1.014s (-0.6%)	0.693s	10	8.32x
🐘 Postgres	Express	0.466s (+25.1% 🔺)	1.046s (+3.2%)	0.580s	10	12.07x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	0.556s (-28.1% 🟢)	1.494s (-6.8% 🟢)	0.938s	10	1.00x
▲ Vercel	Nitro	0.571s (-25.7% 🟢)	1.619s (-6.0% 🟢)	1.048s	10	1.03x
▲ Vercel	Next.js (Turbopack)	0.608s (-20.8% 🟢)	1.467s (-17.1% 🟢)	0.859s	10	1.09x

🔍 Observability: Express | Nitro | Next.js (Turbopack)

workflow with 1 step

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🌐 Starter	🥇 Next.js (Turbopack)	1.089s (+1.6%)	2.009s (~)	0.920s	10	1.00x
💻 Local	Next.js (Turbopack)	1.097s (~)	2.011s (~)	0.914s	10	1.01x
🌐 Redis	Next.js (Turbopack)	1.105s (+1.8%)	2.013s (~)	0.908s	10	1.01x
💻 Local	Nitro	1.113s (~)	2.006s (~)	0.893s	10	1.02x
💻 Local	Express	1.120s (+0.6%)	2.007s (~)	0.887s	10	1.03x
🌐 Turso	Next.js (Turbopack)	1.270s (-3.1%)	2.014s (~)	0.743s	10	1.17x
🌐 MongoDB	Next.js (Turbopack)	1.317s (+1.9%)	2.014s (~)	0.697s	10	1.21x
🐘 Postgres	Next.js (Turbopack)	1.901s (~)	2.016s (~)	0.115s	10	1.75x
🐘 Postgres	Nitro	2.163s (-2.2%)	3.015s (~)	0.852s	10	1.99x
🐘 Postgres	Express	2.401s (+8.9% 🔺)	3.013s (~)	0.612s	10	2.21x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	2.792s (+3.0%)	3.678s (+1.7%)	0.886s	10	1.00x
▲ Vercel	Nitro	2.869s (+3.3%)	3.826s (+4.5%)	0.957s	10	1.03x
▲ Vercel	Next.js (Turbopack)	2.985s (+8.6% 🔺)	3.761s (-1.1%)	0.776s	10	1.07x

🔍 Observability: Express | Nitro | Next.js (Turbopack)

workflow with 10 sequential steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🌐 Starter	🥇 Next.js (Turbopack)	10.588s (+1.1%)	11.010s (~)	0.422s	5	1.00x
💻 Local	Next.js (Turbopack)	10.654s (~)	11.015s (~)	0.360s	5	1.01x
🌐 Redis	Next.js (Turbopack)	10.673s (+1.2%)	11.018s (~)	0.345s	5	1.01x
💻 Local	Nitro	10.790s (~)	11.014s (~)	0.223s	5	1.02x
💻 Local	Express	10.811s (~)	11.013s (~)	0.202s	5	1.02x
🌐 Turso	Next.js (Turbopack)	12.174s (~)	13.023s (~)	0.849s	5	1.15x
🌐 MongoDB	Next.js (Turbopack)	12.344s (+0.9%)	13.035s (~)	0.691s	5	1.17x
🐘 Postgres	Next.js (Turbopack)	15.334s (+3.8%)	16.039s (+2.6%)	0.705s	5	1.45x
🐘 Postgres	Express	20.263s (~)	21.033s (~)	0.769s	5	1.91x
🐘 Postgres	Nitro	20.448s (~)	21.032s (~)	0.584s	5	1.93x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Next.js (Turbopack)	22.504s (~)	23.081s (~)	0.577s	5	1.00x
▲ Vercel	Express	22.917s (~)	23.651s (~)	0.734s	5	1.02x
▲ Vercel	Nitro	23.019s (+5.1% 🔺)	23.932s (+4.6%)	0.913s	5	1.02x

🔍 Observability: Next.js (Turbopack) | Express | Nitro

Promise.all with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🌐 Starter	🥇 Next.js (Turbopack)	1.346s (+3.2%)	2.008s (~)	0.662s	15	1.00x
🌐 Redis	Next.js (Turbopack)	1.364s (+3.3%)	2.011s (~)	0.647s	15	1.01x
💻 Local	Next.js (Turbopack)	1.391s (+1.0%)	2.011s (~)	0.620s	15	1.03x
💻 Local	Nitro	1.412s (~)	2.005s (~)	0.593s	15	1.05x
💻 Local	Express	1.416s (+1.0%)	2.007s (~)	0.590s	15	1.05x
🐘 Postgres	Next.js (Turbopack)	2.015s (+20.3% 🔺)	2.408s (+19.6% 🔺)	0.393s	13	1.50x
🌐 MongoDB	Next.js (Turbopack)	2.145s (~)	3.014s (~)	0.870s	10	1.59x
🌐 Turso	Next.js (Turbopack)	2.188s (-1.1%)	3.014s (~)	0.826s	10	1.62x
🐘 Postgres	Nitro	2.533s (+4.2%)	3.011s (~)	0.478s	10	1.88x
🐘 Postgres	Express	2.672s (+9.8% 🔺)	3.012s (~)	0.340s	10	1.98x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Next.js (Turbopack)	2.769s (-7.9% 🟢)	3.618s (-6.6% 🟢)	0.848s	9	1.00x
▲ Vercel	Nitro	3.167s (+5.8% 🔺)	4.175s (+10.4% 🔺)	1.008s	8	1.14x
▲ Vercel	Express	3.260s (+12.3% 🔺)	4.059s (+10.1% 🔺)	0.799s	8	1.18x

🔍 Observability: Next.js (Turbopack) | Nitro | Express

Promise.all with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	2.052s (-3.3%)	2.900s (-2.1%)	0.847s	11	1.00x
💻 Local	Nitro	2.245s (+0.9%)	3.193s (+0.7%)	0.948s	10	1.09x
💻 Local	Express	2.296s (+3.3%)	3.245s (+2.7%)	0.950s	10	1.12x
🌐 Starter	Next.js (Turbopack)	2.465s (+3.8%)	3.010s (~)	0.545s	10	1.20x
🌐 Redis	Next.js (Turbopack)	2.503s (+6.9% 🔺)	3.013s (~)	0.510s	10	1.22x
🐘 Postgres	Next.js (Turbopack)	2.551s (-0.6%)	3.025s (~)	0.473s	10	1.24x
🐘 Postgres	Nitro	2.986s (-2.0%)	3.212s (-15.1% 🟢)	0.226s	10	1.46x
🐘 Postgres	Express	3.319s (+17.6% 🔺)	4.019s (+33.0% 🔺)	0.699s	8	1.62x
🌐 Turso	Next.js (Turbopack)	4.694s (~)	5.179s (~)	0.484s	6	2.29x
🌐 MongoDB	Next.js (Turbopack)	4.754s (+3.0%)	5.184s (~)	0.430s	6	2.32x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Express	3.158s (-1.1%)	3.619s (+0.5%)	0.461s	9	1.00x
▲ Vercel	Next.js (Turbopack)	3.180s (-6.2% 🟢)	3.774s (-6.0% 🟢)	0.594s	8	1.01x
▲ Vercel	Nitro	3.294s (-11.1% 🟢)	3.858s (-11.1% 🟢)	0.563s	8	1.04x

🔍 Observability: Express | Next.js (Turbopack) | Nitro

Promise.race with 10 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
🌐 Redis	🥇 Next.js (Turbopack)	1.355s (+2.7%)	2.010s (~)	0.655s	15	1.00x
🌐 Starter	Next.js (Turbopack)	1.369s (+4.1%)	2.008s (~)	0.638s	15	1.01x
💻 Local	Next.js (Turbopack)	1.395s (-0.9%)	2.012s (~)	0.617s	15	1.03x
💻 Local	Nitro	1.427s (~)	2.005s (~)	0.578s	15	1.05x
💻 Local	Express	1.445s (+1.7%)	2.006s (~)	0.561s	15	1.07x
🐘 Postgres	Next.js (Turbopack)	1.702s (-2.9%)	2.016s (~)	0.314s	15	1.26x
🐘 Postgres	Nitro	2.116s (+19.5% 🔺)	2.837s (+41.0% 🔺)	0.721s	11	1.56x
🌐 MongoDB	Next.js (Turbopack)	2.131s (-0.8%)	3.013s (~)	0.882s	10	1.57x
🐘 Postgres	Express	2.197s (+12.0% 🔺)	2.921s (+30.8% 🔺)	0.724s	11	1.62x
🌐 Turso	Next.js (Turbopack)	2.224s (~)	3.015s (~)	0.791s	10	1.64x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Next.js (Turbopack)	2.835s (+0.8%)	3.638s (-4.9%)	0.803s	9	1.00x
▲ Vercel	Express	2.855s (-9.1% 🟢)	3.615s (-6.9% 🟢)	0.760s	9	1.01x
▲ Vercel	Nitro	3.069s (+10.1% 🔺)	4.054s (+8.8% 🔺)	0.985s	8	1.08x

🔍 Observability: Next.js (Turbopack) | Express | Nitro

Promise.race with 25 concurrent steps

💻 Local Development

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
💻 Local	🥇 Next.js (Turbopack)	2.049s (-4.8%)	2.915s (-4.4%)	0.866s	11	1.00x
💻 Local	Nitro	2.222s (+0.8%)	3.165s (~)	0.943s	10	1.08x
💻 Local	Express	2.388s (+5.6% 🔺)	3.323s (+3.0%)	0.936s	10	1.17x
🌐 Redis	Next.js (Turbopack)	2.466s (+4.4%)	3.011s (~)	0.544s	10	1.20x
🌐 Starter	Next.js (Turbopack)	2.474s (+4.3%)	3.009s (~)	0.536s	10	1.21x
🐘 Postgres	Next.js (Turbopack)	2.529s (-1.5%)	3.021s (~)	0.493s	10	1.23x
🐘 Postgres	Express	2.740s (~)	3.124s (+3.6%)	0.385s	10	1.34x
🐘 Postgres	Nitro	2.845s (~)	3.117s (~)	0.272s	10	1.39x
🌐 Turso	Next.js (Turbopack)	4.678s (+1.2%)	5.185s (~)	0.507s	6	2.28x
🌐 MongoDB	Next.js (Turbopack)	4.809s (+3.6%)	5.185s (~)	0.376s	6	2.35x

▲ Production (Vercel)

World	Framework	Workflow Time	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Nitro	3.174s (~)	3.733s (-2.6%)	0.560s	9	1.00x
▲ Vercel	Express	3.287s (-3.2%)	3.772s (-8.5% 🟢)	0.485s	8	1.04x
▲ Vercel	Next.js (Turbopack)	3.334s (+5.7% 🔺)	3.894s (-0.7%)	0.559s	8	1.05x

🔍 Observability: Nitro | Express | Next.js (Turbopack)

Stream Benchmarks (includes TTFB metrics)

workflow with stream

💻 Local Development

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
🌐 Starter	🥇 Next.js (Turbopack)	0.125s (+33.7% 🔺)	1.006s (~)	0.000s (-100.0% 🟢)	1.012s (~)	0.887s	10	1.00x
💻 Local	Next.js (Turbopack)	0.133s (-4.0%)	1.002s (~)	0.016s (-0.6%)	1.026s (~)	0.892s	10	1.07x
🌐 Redis	Next.js (Turbopack)	0.152s (+31.0% 🔺)	1.005s (~)	0.000s (NaN%)	1.016s (~)	0.864s	10	1.22x
💻 Local	Nitro	0.178s (+0.7%)	0.993s (~)	0.015s (+1.4%)	1.022s (~)	0.844s	10	1.43x
💻 Local	Express	0.183s (+5.1% 🔺)	0.992s (~)	0.016s (+0.6%)	1.023s (~)	0.840s	10	1.46x
🌐 MongoDB	Next.js (Turbopack)	0.515s (-1.2%)	0.936s (+1.1%)	0.000s (NaN%)	1.013s (~)	0.499s	10	4.12x
🌐 Turso	Next.js (Turbopack)	0.522s (+5.1% 🔺)	0.930s (-2.2%)	0.000s (NaN%)	1.013s (~)	0.492s	10	4.18x
🐘 Postgres	Next.js (Turbopack)	1.308s (+51.0% 🔺)	1.739s (+54.4% 🔺)	0.000s (~)	2.020s (+53.0% 🔺)	0.712s	10	10.47x
🐘 Postgres	Express	2.186s (-7.5% 🟢)	2.857s (+6.6% 🔺)	0.000s (NaN%)	3.015s (~)	0.829s	10	17.50x
🐘 Postgres	Nitro	2.414s (+9.8% 🔺)	2.628s (-7.6% 🟢)	0.000s (~)	3.013s (~)	0.600s	10	19.33x

▲ Production (Vercel)

World	Framework	Workflow Time	TTFB	Slurp	Wall Time	Overhead	Samples	vs Fastest
▲ Vercel	🥇 Next.js (Turbopack)	3.124s (+3.5%)	3.315s (-2.4%)	0.539s (-10.9% 🟢)	4.483s (-0.6%)	1.359s	10	1.00x
▲ Vercel	Express	3.158s (+1.4%)	3.458s (+1.8%)	0.606s (+21.0% 🔺)	4.562s (+1.7%)	1.404s	10	1.01x
▲ Vercel	Nitro	3.306s (+9.8% 🔺)	3.572s (+6.7% 🔺)	0.457s (-3.9%)	4.587s (+6.9% 🔺)	1.281s	10	1.06x

🔍 Observability: Next.js (Turbopack) | Express | Nitro

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World	🥇 Fastest Framework	Wins
💻 Local	Next.js (Turbopack)	8/8
🐘 Postgres	Next.js (Turbopack)	8/8
▲ Vercel	Next.js (Turbopack)	4/8

Fastest World by Framework

Winner determined by most benchmark wins

Framework	🥇 Fastest World	Wins
Express	💻 Local	8/8
Next.js (Turbopack)	🌐 Starter	5/8
Nitro	💻 Local	8/8

Column Definitions

Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
Wall Time: Total testbench time (trigger workflow + poll for result)
Overhead: Testbench overhead (Wall Time - Workflow Time)
Samples: Number of benchmark iterations run
vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

💻 Local: In-memory filesystem world (local development)
🐘 Postgres: PostgreSQL database world (local development)
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vercel · 2026-01-12T20:49:32Z

packages/builders/src/apply-swc-transform.ts

+// Cache decorator options - tsconfig doesn't change during a build
+let cachedDecoratorOptions: Awaited<
+  ReturnType<typeof getDecoratorOptionsForDirectory>
+> | null = null;


Decorator options caching doesn't account for different working directories, causing incorrect tsconfig settings to be applied when processing files from multiple directories.

I, JJ Kasper <[email protected]>, hereby add my Signed-off-by to this commit: aa1dc36 I, JJ Kasper <[email protected]>, hereby add my Signed-off-by to this commit: e25f174 Signed-off-by: JJ Kasper <[email protected]>

technopahadi and others added 4 commits January 9, 2026 16:28

fix: use json5 for parsing tsconfig in decorator options

9dbbda6

Replace manual regex-based JSONC parsing with json5 library for more robust handling of comments and trailing commas in tsconfig.json files.

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aa1dc36

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ijjk closed this Jan 12, 2026

ijjk deleted the ijjk/validate-decorator-support branch January 12, 2026 20:53

ijjk mentioned this pull request Jan 12, 2026

fix: add TypeScript decorator support to SWC transform #757

Merged

apply fix

e25f174

ijjk restored the ijjk/validate-decorator-support branch January 12, 2026 21:21

ijjk reopened this Jan 12, 2026

DCO Remediation Commit for JJ Kasper <[email protected]>

3ab8956

I, JJ Kasper <[email protected]>, hereby add my Signed-off-by to this commit: aa1dc36 I, JJ Kasper <[email protected]>, hereby add my Signed-off-by to this commit: e25f174 Signed-off-by: JJ Kasper <[email protected]>

ijjk force-pushed the ijjk/validate-decorator-support branch from 1e67595 to 3ab8956 Compare January 12, 2026 21:26

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fix: add TypeScript decorator support to SWC transform #769

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fix: add TypeScript decorator support to SWC transform #769

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