Node OOM error with v0.47

[pheuter]

After upgrading to UnoCSS v0.47.1 my vite build now throws an OOM exception and never completes (see error below).

If I comment out presetIcons() from plugins: [UnoCSS({presets: []})] then the build succeeds. It appears that some recent change that affects how @unocss/preset-icons works is causing the build to run out of memory.

---

12:11:22 PM [vite-plugin-svelte] dom compile done.
package                         files     time     avg
@careswitch/v2                     52    0.76s  14.6ms
svelecte                            6    0.15s  24.2ms
svelte-tiny-virtual-list            1   15.8ms  15.8ms
@sveltejs/kit                       1    3.8ms   3.8ms

<--- Last few GCs --->

[60094:0x130078000]     7701 ms: Mark-sweep 3975.6 (4129.2) -> 3975.5 (4126.7) MB, 69.1 / 0.0 ms  (average mu = 0.792, current mu = 0.202) allocation failure; scavenge might not succeed
[60094:0x130078000]     7825 ms: Mark-sweep 3983.0 (4134.4) -> 3983.0 (4150.2) MB, 121.2 / 0.0 ms  (average mu = 0.532, current mu = 0.023) allocation failure; scavenge might not succeed


<--- JS stacktrace --->

FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory
 1: 0x104456c88 node::Abort() [/opt/homebrew/Cellar/node/19.1.0/bin/node]
 2: 0x104457f54 node::ModifyCodeGenerationFromStrings(v8::Local<v8::Context>, v8::Local<v8::Value>, bool) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
 3: 0x1045b1648 v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, v8::OOMDetails const&) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
 4: 0x1045b15f4 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, v8::OOMDetails const&) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
 5: 0x104749678 v8::internal::Heap::GarbageCollectionReasonToString(v8::internal::GarbageCollectionReason) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
 6: 0x104748ff0 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
 7: 0x10473ea4c v8::internal::HeapAllocator::AllocateRawWithLightRetrySlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
 8: 0x10473f1ac v8::internal::HeapAllocator::AllocateRawWithRetryOrFailSlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
 9: 0x1047239b0 v8::internal::Factory::AllocateRaw(int, v8::internal::AllocationType, v8::internal::AllocationAlignment) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
10: 0x10471a804 v8::internal::MaybeHandle<v8::internal::SeqOneByteString> v8::internal::FactoryBase<v8::internal::Factory>::NewRawStringWithMap<v8::internal::SeqOneByteString>(int, v8::internal::Map, v8::internal::AllocationType) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
11: 0x104726090 v8::internal::Factory::NewStringFromUtf8(v8::base::Vector<unsigned char const> const&, unibrow::Utf8Variant, v8::internal::AllocationType) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
12: 0x1045d01f0 v8::String::NewFromUtf8(v8::Isolate*, char const*, v8::NewStringType, int) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
13: 0x10451c624 node::(anonymous namespace)::MakeString(v8::Isolate*, char const*, unsigned long, node::encoding) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
14: 0x10451c52c node::StringDecoder::DecodeData(v8::Isolate*, char const*, unsigned long*) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
15: 0x10451c944 node::(anonymous namespace)::DecodeData(v8::FunctionCallbackInfo<v8::Value> const&) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
16: 0x104239e18 Builtins_CallApiCallback [/opt/homebrew/Cellar/node/19.1.0/bin/node]
17: 0x10c3fb0e4 
18: 0x10c3f8f48 
19: 0x10426b7b4 Builtins_AsyncFunctionAwaitResolveClosure [/opt/homebrew/Cellar/node/19.1.0/bin/node]
20: 0x104305a98 Builtins_PromiseFulfillReactionJob [/opt/homebrew/Cellar/node/19.1.0/bin/node]
21: 0x10425cc54 Builtins_RunMicrotasks [/opt/homebrew/Cellar/node/19.1.0/bin/node]
22: 0x1042363c4 Builtins_JSRunMicrotasksEntry [/opt/homebrew/Cellar/node/19.1.0/bin/node]
23: 0x1046d07e4 v8::internal::(anonymous namespace)::Invoke(v8::internal::Isolate*, v8::internal::(anonymous namespace)::InvokeParams const&) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
24: 0x1046d0da0 v8::internal::(anonymous namespace)::InvokeWithTryCatch(v8::internal::Isolate*, v8::internal::(anonymous namespace)::InvokeParams const&) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
25: 0x1046f34b0 v8::internal::MicrotaskQueue::RunMicrotasks(v8::internal::Isolate*) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
26: 0x1046f32e0 v8::internal::MicrotaskQueue::PerformCheckpointInternal(v8::Isolate*) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
27: 0x104390af4 node::InternalCallbackScope::Close() [/opt/homebrew/Cellar/node/19.1.0/bin/node]
28: 0x104451550 node::fs::FSReqPromise<node::AliasedBufferBase<long long, v8::BigInt64Array, void> >::Resolve(v8::Local<v8::Value>) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
29: 0x10445f4c0 node::fs::AfterInteger(uv_fs_s*) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
30: 0x104450e1c node::MakeLibuvRequestCallback<uv_fs_s, void (*)(uv_fs_s*)>::Wrapper(uv_fs_s*) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
31: 0x106c1aff8 uv__work_done [/opt/homebrew/Cellar/libuv/1.44.2/lib/libuv.1.dylib]
32: 0x106c1e3d0 uv__async_io [/opt/homebrew/Cellar/libuv/1.44.2/lib/libuv.1.dylib]
33: 0x106c2e1e0 uv__io_poll [/opt/homebrew/Cellar/libuv/1.44.2/lib/libuv.1.dylib]
34: 0x106c1e7d0 uv_run [/opt/homebrew/Cellar/libuv/1.44.2/lib/libuv.1.dylib]
35: 0x1043918b8 node::SpinEventLoopInternal(node::Environment*) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
36: 0x104498348 node::NodeMainInstance::Run(node::ExitCode*, node::Environment*) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
37: 0x104497fac node::NodeMainInstance::Run() [/opt/homebrew/Cellar/node/19.1.0/bin/node]
38: 0x10441fcd0 node::LoadSnapshotDataAndRun(node::SnapshotData const**, node::InitializationResultImpl const*) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
39: 0x10441fe30 node::Start(int, char**) [/opt/homebrew/Cellar/node/19.1.0/bin/node]
40: 0x198c03e50 start [/usr/lib/dyld]
zsh: abort      npm run build

[sibbng]

Should be because of #1926.

We could move the icons layer out of renderChunk hook. I will look into it.

[sibbng]

I couldn't create a reproduction that works with v46 but not v47. It could be related to a specific @sveltejs/kit plugin.

I need a reproduction.

[pheuter]

@sibbng Here's a repro: https://github.com/pheuter/unocss-memory-repro

I created artificially large amount of files, but if you downgrade UnoCSS to 0.46.5 it's still able to successfully complete npm run build.

[sibbng]

Thanks for the reproduction 🙏 I made a PR to fix it: #1935