feat: support yarn PnP out of box, propagate PnP runtime

.changeset/light-comics-smell.md

@@ -0,0 +1,5 @@
+---
+"synckit": patch
+---
+
+feat: support yarn PnP out of box, propagate PnP runtime

package.json

@@ -96,6 +96,7 @@
     "deasync": "^0.1.27",
     "esbuild-register": "^3.3.3",
     "esbuild-runner": "^2.2.1",
+    "execa": "^6.1.0",
     "jest": "^28.1.3",
     "patch-package": "^6.4.7",
     "sync-threads": "^1.0.1",

src/index.ts

@@ -42,6 +42,7 @@ const {
   SYNCKIT_TIMEOUT,
   SYNCKIT_EXEC_ARGV,
   SYNCKIT_TS_RUNNER,
+  NODE_OPTIONS,
 } = process.env
 
 export const DEFAULT_BUFFER_SIZE = SYNCKIT_BUFFER_SIZE
@@ -209,6 +210,22 @@ const setupTsRunner = (
     }
   }
 
+  /* istanbul ignore if -- https://github.com/facebook/jest/issues/5274 */
+  if (process.versions.pnp) {
+    const nodeOptions = NODE_OPTIONS?.split(/\s+/)
+    const pnpApiPath = cjsRequire.resolve('pnpapi')
+    if (
+      !nodeOptions?.some(
+        (option, index) =>
+          ['-r', '--require'].includes(option) &&
+          pnpApiPath === cjsRequire.resolve(nodeOptions[index + 1]),
+      ) &&
+      !execArgv.includes(pnpApiPath)
+    ) {
+      execArgv = ['-r', pnpApiPath, ...execArgv]
+    }
+  }
+
   return {
     ext,
     isTs,

test/fixtures/yarn-pnp.spec.ts

@@ -0,0 +1,11 @@
+import { resolve } from 'node:path'
+
+import { execaNode } from 'execa'
+
+test('yarn-pnp', async () => {
+  const { stdout } = await execaNode('index.js', [], {
+    nodeOptions: ['-r', './.pnp.cjs'],
+    cwd: resolve('test/fixtures/yarn-pnp'),
+  })
+  expect(stdout).toBe([1, 2, 5].join(' '))
+})