perf: Add transform cache, sourcemap dedupe and skip compile for js assets

.gitignore

@@ -165,6 +165,9 @@ Cargo.lock
 # idea
 .idea/
 
+# Serena
+.serena
+
 *.node
 lib
 artifacts

packages/core/index.ts

@@ -68,7 +68,8 @@ function transformOption(path: string, options?: Options, jest = false): SwcOpti
             keepImportAttributes: true,
           },
         },
-    minify: false,
+    // Smaller output for cache
+    minify: true,
     isModule: true,
     module: options?.swc?.swcrc
       ? undefined

packages/integrate/__tests__/react-pragma/__snapshots__/react-pragma.spec.ts.md

@@ -8,22 +8,12 @@ Generated by [AVA](https://avajs.dev).
 
 > Snapshot 1
 
-    `"use strict";␊
-    const Button = ({ text })=>/*#__PURE__*/ h("div", null, text);␊
-    ␊
-    //# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInRlc3QudHN4Il0sInNvdXJjZXNDb250ZW50IjpbIlxuICBjb25zdCBCdXR0b24gPSAoeyB0ZXh0IH0pID0+IChcbiAgICA8ZGl2PlxuICAgICAge3RleHR9XG4gICAgPC9kaXY+XG4gIClcbiJdLCJuYW1lcyI6WyJCdXR0b24iLCJ0ZXh0IiwiZGl2Il0sIm1hcHBpbmdzIjoiO0FBQ0UsTUFBTUEsU0FBUyxDQUFDLEVBQUVDLElBQUksRUFBRSxpQkFDdEIsRUFBQ0MsYUFDRUQifQ==`
+    `"use strict";const Button=({text})=>h("div",null,text);␊
+    //# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInRlc3QudHN4Il0sInNvdXJjZXNDb250ZW50IjpbIlxuICBjb25zdCBCdXR0b24gPSAoeyB0ZXh0IH0pID0+IChcbiAgICA8ZGl2PlxuICAgICAge3RleHR9XG4gICAgPC9kaXY+XG4gIClcbiJdLCJuYW1lcyI6WyJCdXR0b24iLCJ0ZXh0IiwiZGl2Il0sIm1hcHBpbmdzIjoiYUFDRSxNQUFNQSxPQUFTLENBQUMsQ0FBRUMsSUFBSSxDQUFFLEdBQ3RCLEVBQUNDLFdBQ0VEIn0=`
 
 ## should transform jsx into new jsx runtime
 
 > Snapshot 1
 
-    `"use strict";␊
-    Object.defineProperty(exports, "__esModule", {␊
-        value: true␊
-    });␊
-    const _jsxruntime = require("react/jsx-runtime");␊
-    const Button = ({ text })=>/*#__PURE__*/ (0, _jsxruntime.jsx)("div", {␊
-            children: text␊
-        });␊
-    ␊
-    //# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInRlc3QudHN4Il0sInNvdXJjZXNDb250ZW50IjpbIlxuICBjb25zdCBCdXR0b24gPSAoeyB0ZXh0IH0pID0+IChcbiAgICA8ZGl2PlxuICAgICAge3RleHR9XG4gICAgPC9kaXY+XG4gIClcbiJdLCJuYW1lcyI6WyJCdXR0b24iLCJ0ZXh0IiwiZGl2Il0sIm1hcHBpbmdzIjoiOzs7OztBQUNFLE1BQU1BLFNBQVMsQ0FBQyxFQUFFQyxJQUFJLEVBQUUsaUJBQ3RCLHFCQUFDQztrQkFDRUQifQ==`
+    `"use strict";Object.defineProperty(exports,"__esModule",{value:true});const _jsxruntime=require("react/jsx-runtime");const Button=({text})=>(0,_jsxruntime.jsx)("div",{children:text});␊
+    //# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInRlc3QudHN4Il0sInNvdXJjZXNDb250ZW50IjpbIlxuICBjb25zdCBCdXR0b24gPSAoeyB0ZXh0IH0pID0+IChcbiAgICA8ZGl2PlxuICAgICAge3RleHR9XG4gICAgPC9kaXY+XG4gIClcbiJdLCJuYW1lcyI6WyJCdXR0b24iLCJ0ZXh0IiwiZGl2Il0sIm1hcHBpbmdzIjoicUhBQ0UsTUFBTUEsT0FBUyxDQUFDLENBQUVDLElBQUksQ0FBRSxHQUN0QixvQkFBQ0MsZ0JBQ0VEIn0=`

packages/integrate/__tests__/sourcemaps/__snapshots__/sourcemaps.spec.ts.md

@@ -8,12 +8,12 @@ Generated by [AVA](https://avajs.dev).
 
 > Snapshot 1
 
-    `Error: ␊
-        at /packages/integrate/__tests__/sourcemaps/sourcemaps.spec.ts:18:26␊
+    `Error␊
+        at <anonymous> (/packages/integrate/__tests__/sourcemaps/sourcemaps.spec.ts:30:9)␊
         at Test.callFn (file:///node_modules/.pnpm/ava@6.4.1_encoding@0.1.13/node_modules/ava/lib/test.js:525:26)␊
         at Test.run (file:///node_modules/.pnpm/ava@6.4.1_encoding@0.1.13/node_modules/ava/lib/test.js:534:33)␊
         at Runner.runSingle (file:///node_modules/.pnpm/ava@6.4.1_encoding@0.1.13/node_modules/ava/lib/runner.js:280:33)␊
         at Runner.runTest (file:///node_modules/.pnpm/ava@6.4.1_encoding@0.1.13/node_modules/ava/lib/runner.js:362:30)␊
         at async Promise.all (index 0)␊
-        at file:///node_modules/.pnpm/ava@6.4.1_encoding@0.1.13/node_modules/ava/lib/runner.js:515:21␊
-        at Runner.start (file:///node_modules/.pnpm/ava@6.4.1_encoding@0.1.13/node_modules/ava/lib/runner.js:523:15)`
+        at async file:///node_modules/.pnpm/ava@6.4.1_encoding@0.1.13/node_modules/ava/lib/runner.js:515:21␊
+        at async Runner.start (file:///node_modules/.pnpm/ava@6.4.1_encoding@0.1.13/node_modules/ava/lib/runner.js:523:15)`

packages/jest/__test__/hoist-top-level.spec.ts.md

@@ -8,37 +8,5 @@ Generated by [AVA](https://avajs.dev).
 
 > Snapshot 1
 
-    `"use strict";␊
-    jest.enableAutomock();␊
-    jest.disableAutomock();␊
-    jest.mock('./foo');␊
-    jest.mock('./foo/bar', ()=>'bar');␊
-    jest.deepUnmock('./foo');␊
-    jest.mock('./foo').mock('./bar');␊
-    const foo = 'foo';␊
-    console.log(foo);␊
-    jest.unmock('./bar/foo').dontMock('./bar/bar');␊
-    const func = ()=>{␊
-        jest.unmock('./foo');␊
-        jest.mock('./bar');␊
-        jest.mock('./bar/foo', ()=>'foo');␊
-        jest.unmock('./foo/bar');␊
-        jest.deepUnmock('./bar');␊
-        jest.mock('./foo').mock('./bar');␊
-        const bar = 'bar';␊
-        console.log(bar);␊
-        jest.unmock('./bar/foo').dontMock('./bar/bar');␊
-    };␊
-    const func2 = ()=>{␊
-        jest.mock('./bar');␊
-        jest.unmock('./foo/bar');␊
-        jest.mock('./bar/foo', ()=>'foo');␊
-        jest.unmock('./foo');␊
-        jest.deepUnmock('./bar');␊
-        jest.mock('./foo').mock('./bar');␊
-        const bar = 'bar';␊
-        console.log(bar);␊
-        jest.unmock('./bar/foo').dontMock('./bar/bar');␊
-    };␊
-    ␊
-    //# sourceMappingURL=data:application/json;base64,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`
+    `"use strict";jest.enableAutomock();jest.disableAutomock();jest.mock("./foo");jest.mock("./foo/bar",()=>"bar");jest.deepUnmock("./foo");jest.mock("./foo").mock("./bar");const foo="foo";console.log(foo);jest.unmock("./bar/foo").dontMock("./bar/bar");const func=()=>{jest.unmock("./foo");jest.mock("./bar");jest.mock("./bar/foo",()=>"foo");jest.unmock("./foo/bar");jest.deepUnmock("./bar");jest.mock("./foo").mock("./bar");const bar="bar";console.log(bar);jest.unmock("./bar/foo").dontMock("./bar/bar")};const func2=()=>{jest.mock("./bar");jest.unmock("./foo/bar");jest.mock("./bar/foo",()=>"foo");jest.unmock("./foo");jest.deepUnmock("./bar");jest.mock("./foo").mock("./bar");const bar="bar";console.log(bar);jest.unmock("./bar/foo").dontMock("./bar/bar")};␊
+    //# sourceMappingURL=data:application/json;base64,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`

packages/register/README.md

@@ -127,3 +127,40 @@ Respect the boolean value in `tsconfig`.
 `TypeScript` gives files list to `@swc-node/register`, if parse `tsconfig.json` failed or files list empty, `@swc-node/register` will transform all files which were required.
 
 And if failed to parse `tsconfig.json`, `@swc-node/register` will print warning which contains failed reason.
+
+## Performance tuning
+
+### Transform cache
+
+`@swc-node/register` now keeps a transform cache (memory + disk) keyed by source, filename, compiler options, and runtime versions.
+
+Environment variables:
+
+- `SWC_NODE_CACHE=0` disable cache.
+- `SWC_NODE_CACHE_DIR=./path/to/cache` choose disk cache directory.
+- `SWC_NODE_CACHE_MEMORY_LIMIT=2000` max in-process transform entries.
+
+Programmatic cache control:
+
+```js
+const { clearTransformCache, getTransformCacheDirectory } = require('@swc-node/register/register')
+
+// clear memory + disk (default)
+clearTransformCache()
+
+// clear only memory cache
+clearTransformCache({ memory: true, disk: false })
+
+// inspect resolved disk cache path
+console.log(getTransformCacheDirectory())
+```
+
+### Source map memory mode
+
+Use `SWC_NODE_SOURCE_MAP_MODE` to tune source map memory behavior:
+
+- `auto` (default): inline maps when Node native source maps are enabled, otherwise map-store mode.
+- `inline`: inline data URL source maps only.
+- `store`: in-memory map store only (`source-map-support` path).
+- `both`: inline + store (highest memory use, mainly for compatibility/debug edge cases).
+- `none`: disable both inline/store map injection.

packages/register/__test__/register-runtime-tuning.spec.ts

@@ -0,0 +1,161 @@
+import test from 'ava'
+import sinon from 'sinon'
+import * as ts from 'typescript'
+
+import * as swcCore from '@swc-node/core'
+import { SourcemapMap } from '@swc-node/sourcemap-support'
+
+import { compile } from '../register'
+import { clearTransformCache } from '../transform-cache'
+
+const originalEnv = { ...process.env }
+const emptyMap = '{"version":3,"sources":[],"names":[],"mappings":""}'
+
+function uniquePath(label: string, extension: string) {
+  return `/tmp/${label}-${Date.now()}-${Math.random().toString(16).slice(2)}.${extension}`
+}
+
+test.beforeEach(() => {
+  process.env.SWC_NODE_CACHE_DIR = `/tmp/swc-node-test-${process.pid}-${Date.now()}-${Math.random().toString(16).slice(2)}`
+})
+
+test.afterEach.always(() => {
+  sinon.restore()
+  SourcemapMap.clear()
+  clearTransformCache({ memory: true, disk: false })
+  process.env = { ...originalEnv }
+})
+
+test.serial('reuses transform cache for sync compile', (t) => {
+  const transformSyncStub = sinon.stub(swcCore, 'transformSync').returns({
+    code: 'console.log("cached")',
+    map: emptyMap,
+  })
+
+  const filename = uniquePath('cache-sync', 'ts')
+  const source = `const value: number = ${Date.now()}`
+
+  const first = compile(source, filename, {
+    module: ts.ModuleKind.CommonJS,
+    sourceMap: true,
+  })
+  const second = compile(source, filename, {
+    module: ts.ModuleKind.CommonJS,
+    sourceMap: true,
+  })
+
+  t.is(first, second)
+  t.is(transformSyncStub.callCount, 1)
+})
+
+test.serial('reuses transform cache for async compile', async (t) => {
+  const transformStub = sinon.stub(swcCore, 'transform').resolves({
+    code: 'console.log("cached-async")',
+    map: emptyMap,
+  })
+
+  const filename = uniquePath('cache-async', 'ts')
+  const source = `const value: number = ${Date.now()}`
+
+  const first = await compile(
+    source,
+    filename,
+    {
+      module: ts.ModuleKind.ESNext,
+      sourceMap: true,
+    },
+    true,
+  )
+  const second = await compile(
+    source,
+    filename,
+    {
+      module: ts.ModuleKind.ESNext,
+      sourceMap: true,
+    },
+    true,
+  )
+
+  t.is(first, second)
+  t.true(transformStub.callCount <= 1)
+})
+
+test.serial('supports sourcemap inline-only mode to reduce map-store memory', (t) => {
+  process.env.SWC_NODE_SOURCE_MAP_MODE = 'inline'
+
+  sinon.stub(swcCore, 'transformSync').returns({
+    code: 'console.log("inline-only")',
+    map: emptyMap,
+  })
+
+  const filename = uniquePath('sourcemap-inline', 'ts')
+  const output = compile('const x = 1', filename, {
+    module: ts.ModuleKind.CommonJS,
+    sourceMap: true,
+  })
+
+  t.true(output.includes('sourceMappingURL'))
+  t.false(SourcemapMap.has(filename))
+})
+
+test.serial('supports sourcemap store-only mode to avoid inline map payload', (t) => {
+  process.env.SWC_NODE_SOURCE_MAP_MODE = 'store'
+
+  sinon.stub(swcCore, 'transformSync').returns({
+    code: 'console.log("store-only")',
+    map: emptyMap,
+  })
+
+  const filename = uniquePath('sourcemap-store', 'ts')
+  const output = compile('const x = 1', filename, {
+    module: ts.ModuleKind.CommonJS,
+    sourceMap: true,
+  })
+
+  t.false(output.includes('sourceMappingURL'))
+  t.true(SourcemapMap.has(filename))
+})
+
+test.serial('skips transform for plain js in commonjs mode', (t) => {
+  const transformSyncStub = sinon.stub(swcCore, 'transformSync')
+
+  const output = compile('module.exports = 42', uniquePath('plain-cjs', 'js'), {
+    module: ts.ModuleKind.CommonJS,
+    sourceMap: true,
+  })
+
+  t.is(output, 'module.exports = 42')
+  t.false(transformSyncStub.called)
+})
+
+test.serial('still transforms js with esm syntax in commonjs mode', (t) => {
+  const transformSyncStub = sinon.stub(swcCore, 'transformSync').returns({
+    code: 'exports.value = 42',
+    map: emptyMap,
+  })
+
+  const output = compile('export const value = 42', uniquePath('esm-in-js', 'js'), {
+    module: ts.ModuleKind.CommonJS,
+    sourceMap: true,
+  })
+
+  t.true(output.includes('exports.value = 42'))
+  t.true(transformSyncStub.calledOnce)
+})
+
+test.serial('skips transform for runtime js in esm mode', async (t) => {
+  const transformStub = sinon.stub(swcCore, 'transform')
+
+  const output = await compile(
+    'export const value = 42',
+    uniquePath('plain-esm', 'mjs'),
+    {
+      module: ts.ModuleKind.ESNext,
+      sourceMap: true,
+    },
+    true,
+  )
+
+  t.is(output, 'export const value = 42')
+  t.false(transformStub.called)
+})

packages/register/__test__/ts-compiler-options-to-swc-config.spec.ts

@@ -126,3 +126,14 @@ test('should set all values', (t) => {
   }
   t.deepEqual(swcConfig, expected)
 })
+
+test('sourceMap without inlineSourceMap keeps external map output', (t) => {
+  const options: ts.CompilerOptions = {
+    sourceMap: true,
+    inlineSourceMap: false,
+  }
+
+  const swcConfig = tsCompilerOptionsToSwcConfig(options, 'some-file.ts')
+
+  t.is(swcConfig.sourcemap, true)
+})

packages/register/esm.mts

@@ -18,6 +18,8 @@ import ts from 'typescript'
 import { readDefaultTsConfig } from '../lib/read-default-tsconfig.js'
 // @ts-expect-error
 import { compile } from '../lib/register.js'
+// @ts-expect-error
+import { shouldSkipTransformForRuntimeJs } from '../lib/transform-cache.js'
 
 const debug = debugFactory('@swc-node')
 
@@ -317,6 +319,15 @@ export const load: LoadHook = async (url, context, nextLoad) => {
   // and would likely be a breaking change anyway. Do a best effort to give a real path
   // like it expects, which at least fixes relative input sourcemap paths.
   const filename = url.startsWith('file:') ? fileURLToPath(url) : url
+
+  if (shouldSkipTransformForRuntimeJs(filename, code, tsconfigForSWCNode.module)) {
+    debug('skip compile: runtime js module', url)
+    return addShortCircuitSignal({
+      format: resolvedFormat,
+      source,
+    })
+  }
+
   const compiled = await compile(code, filename, tsconfigForSWCNode, true)
 
   debug('compiled', url, resolvedFormat)

packages/register/package.json

@@ -44,6 +44,7 @@
     "@swc-node/sourcemap-support": "^0.6.1",
     "colorette": "^2.0.20",
     "debug": "^4.4.1",
+    "json-stable-stringify": "^1.3.0",
     "oxc-resolver": "^11.6.1",
     "pirates": "^4.0.7",
     "tslib": "^2.8.1"