work around api deprecations in deno 1.40.x

.github/workflows/ci.yml

@@ -89,12 +89,10 @@ jobs:
         with:
           node-version: 16
 
-      # The version of Deno is pinned because version 1.25.1 was causing test
-      # flakes due to random segfaults.
-      - name: Setup Deno 1.24.0
+      - name: Setup Deno 1.40.0
         uses: denoland/setup-deno@main
         with:
-          deno-version: v1.24.0
+          deno-version: v1.40.0
 
       - name: Check out code into the Go module directory
         uses: actions/checkout@v3
@@ -199,8 +197,8 @@ jobs:
 
           make test-yarnpnp
 
-  esbuild-old-versions:
-    name: esbuild CI (old versions)
+  esbuild-old-go-version:
+    name: esbuild CI (old Go version)
     runs-on: ubuntu-latest
 
     steps:
@@ -221,3 +219,35 @@ jobs:
 
       - name: make test-old-ts
         run: make test-old-ts
+
+  esbuild-old-deno-version:
+    name: esbuild CI (old Deno version)
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    steps:
+      - name: Set up Go 1.x
+        uses: actions/setup-go@v3
+        with:
+          go-version: 1.20.12
+        id: go
+
+      # Make sure esbuild works with old versions of Deno. Note: It's important
+      # to test a version before 1.31.0, which introduced the "Deno.Command" API.
+      - name: Setup Deno 1.24.0
+        uses: denoland/setup-deno@main
+        with:
+          deno-version: v1.24.0
+
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v3
+
+      - name: Deno Tests (non-Windows)
+        if: matrix.os != 'windows-latest'
+        run: make test-deno
+
+      - name: Deno Tests (Windows)
+        if: matrix.os == 'windows-latest'
+        run: make test-deno-windows

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## Unreleased
+
+* Work around API deprecations in Deno 1.40.x ([#3609](https://github.com/evanw/esbuild/issues/3609))
+
+    Deno 1.40.0 introduced run-time warnings about certain APIs that esbuild uses. With this release, esbuild will work around these run-time warnings by using other APIs if they are present, and falling back to the original APIs otherwise. This should avoid the warnings without breaking compatibility with older versions of Deno.
+
+    Unfortunately, doing this introduces a breaking change. The other child process APIs seem to lack a way to synchronously terminate esbuild's child process, which causes Deno to now fail tests with a confusing error about a thing called `op_spawn_wait` in Deno's internals. To work around this, esbuild's `stop()` function has been changed to return a promise, and you now have to change `esbuild.stop()` to `await esbuild.stop()` in all of your Deno tests.
+
 ## 0.19.12
 
 * The "preserve" JSX mode now preserves JSX text verbatim ([#3605](https://github.com/evanw/esbuild/issues/3605))

lib/deno/mod.ts

@@ -43,8 +43,8 @@ export const analyzeMetafileSync: typeof types.analyzeMetafileSync = () => {
   throw new Error(`The "analyzeMetafileSync" API does not work in Deno`)
 }
 
-export const stop = () => {
-  if (stopService) stopService()
+export const stop = async () => {
+  if (stopService) await stopService()
 }
 
 let initializeWasCalled = false
@@ -178,63 +178,147 @@ interface Service {
 
 let defaultWD = Deno.cwd()
 let longLivedService: Promise<Service> | undefined
-let stopService: (() => void) | undefined
+let stopService: (() => Promise<void>) | undefined
+
+// Declare a common subprocess API for the two implementations below
+type SpawnFn = (cmd: string, options: {
+  args: string[]
+  stdin: 'piped' | 'inherit'
+  stdout: 'piped' | 'inherit'
+  stderr: 'inherit'
+}) => {
+  stdin: {
+    write(bytes: Uint8Array): void
+    close(): void
+  }
+  stdout: {
+    read(): Promise<Uint8Array | null>
+    close(): void
+  }
+  close(): Promise<void> | void
+  status(): Promise<{ code: number }>
+}
+
+// Deno ≥1.40
+const spawnNew: SpawnFn = (cmd, { args, stdin, stdout, stderr }) => {
+  const child = new Deno.Command(cmd, {
+    args,
+    cwd: defaultWD,
+    stdin,
+    stdout,
+    stderr,
+  }).spawn()
+  const writer = child.stdin.getWriter()
+  const reader = child.stdout.getReader()
+  return {
+    stdin: {
+      write: bytes => writer.write(bytes),
+      close: () => writer.close(),
+    },
+    stdout: {
+      read: () => reader.read().then(x => x.value || null),
+      close: () => reader.cancel(),
+    },
+    close: async () => {
+      try {
+        // This only works on macOS and Linux, but not on Windows (see below)
+        child.kill()
+
+        // Without this, Deno will fail tests with some weird error about "op_spawn_wait"
+        await child.status
+      } catch {
+        // This will throw with EPERM on Windows (happens in GitHub Actions).
+        // Who knows why, but tests appear to pass if the error is swallowed.
+      }
+    },
+    status: () => child.status,
+  }
+}
 
-let ensureServiceIsRunning = (): Promise<Service> => {
+// Deno <1.40
+const spawnOld: SpawnFn = (cmd, { args, stdin, stdout, stderr }) => {
+  const child = Deno.run({
+    cmd: [cmd].concat(args),
+    cwd: defaultWD,
+    stdin,
+    stdout,
+    stderr,
+  })
+  const stdoutBuffer = new Uint8Array(4 * 1024 * 1024)
+  let writeQueue: Uint8Array[] = []
+  let isQueueLocked = false
+
+  // We need to keep calling "write()" until it actually writes the data
+  const startWriteFromQueueWorker = () => {
+    if (isQueueLocked || writeQueue.length === 0) return
+    isQueueLocked = true
+    child.stdin!.write(writeQueue[0]).then(bytesWritten => {
+      isQueueLocked = false
+      if (bytesWritten === writeQueue[0].length) writeQueue.shift()
+      else writeQueue[0] = writeQueue[0].subarray(bytesWritten)
+      startWriteFromQueueWorker()
+    })
+  }
+
+  return {
+    stdin: {
+      write: bytes => {
+        writeQueue.push(bytes)
+        startWriteFromQueueWorker()
+      },
+      close: () => child.stdin!.close(),
+    },
+    stdout: {
+      read: () => child.stdout!.read(stdoutBuffer).then(n => n === null ? null : stdoutBuffer.subarray(0, n)),
+      close: () => child.stdout!.close(),
+    },
+    close: () => child.close(),
+    status: () => child.status(),
+  }
+}
+
+// This is a shim for "Deno.run" for newer versions of Deno
+const spawn: SpawnFn = Deno.Command ? spawnNew : spawnOld
+
+const ensureServiceIsRunning = (): Promise<Service> => {
   if (!longLivedService) {
     longLivedService = (async (): Promise<Service> => {
       const binPath = await install()
-      const isTTY = Deno.isatty(Deno.stderr.rid)
+      const isTTY = Deno.stderr.isTerminal
+        ? Deno.stderr.isTerminal() // Deno ≥1.40
+        : Deno.isatty(Deno.stderr.rid) // Deno <1.40
 
-      const child = Deno.run({
-        cmd: [binPath, `--service=${version}`],
-        cwd: defaultWD,
+      const child = spawn(binPath, {
+        args: [`--service=${version}`],
         stdin: 'piped',
         stdout: 'piped',
         stderr: 'inherit',
       })
 
-      stopService = () => {
+      stopService = async () => {
         // Close all resources related to the subprocess.
         child.stdin.close()
         child.stdout.close()
-        child.close()
+        await child.close()
         initializeWasCalled = false
         longLivedService = undefined
         stopService = undefined
       }
 
-      let writeQueue: Uint8Array[] = []
-      let isQueueLocked = false
-
-      // We need to keep calling "write()" until it actually writes the data
-      const startWriteFromQueueWorker = () => {
-        if (isQueueLocked || writeQueue.length === 0) return
-        isQueueLocked = true
-        child.stdin.write(writeQueue[0]).then(bytesWritten => {
-          isQueueLocked = false
-          if (bytesWritten === writeQueue[0].length) writeQueue.shift()
-          else writeQueue[0] = writeQueue[0].subarray(bytesWritten)
-          startWriteFromQueueWorker()
-        })
-      }
-
       const { readFromStdout, afterClose, service } = common.createChannel({
         writeToStdin(bytes) {
-          writeQueue.push(bytes)
-          startWriteFromQueueWorker()
+          child.stdin.write(bytes)
         },
         isSync: false,
         hasFS: true,
         esbuild: ourselves,
       })
 
-      const stdoutBuffer = new Uint8Array(4 * 1024 * 1024)
-      const readMoreStdout = () => child.stdout.read(stdoutBuffer).then(n => {
-        if (n === null) {
+      const readMoreStdout = () => child.stdout.read().then(buffer => {
+        if (buffer === null) {
           afterClose(null)
         } else {
-          readFromStdout(stdoutBuffer.subarray(0, n))
+          readFromStdout(buffer)
           readMoreStdout()
         }
       }).catch(e => {
@@ -331,9 +415,8 @@ let ensureServiceIsRunning = (): Promise<Service> => {
 
 // If we're called as the main script, forward the CLI to the underlying executable
 if (import.meta.main) {
-  Deno.run({
-    cmd: [await install()].concat(Deno.args),
-    cwd: defaultWD,
+  spawn(await install(), {
+    args: Deno.args,
     stdin: 'inherit',
     stdout: 'inherit',
     stderr: 'inherit',

lib/deno/wasm.ts

@@ -50,6 +50,7 @@ export const analyzeMetafileSync: typeof types.analyzeMetafileSync = () => {
 
 export const stop = () => {
   if (stopService) stopService()
+  return Promise.resolve()
 }
 
 interface Service {

lib/npm/browser.ts

@@ -45,6 +45,7 @@ export const analyzeMetafileSync: typeof types.analyzeMetafileSync = () => {
 
 export const stop = () => {
   if (stopService) stopService()
+  return Promise.resolve()
 }
 
 interface Service {

lib/npm/node.ts

@@ -223,6 +223,7 @@ export let analyzeMetafileSync: typeof types.analyzeMetafileSync = (metafile, op
 export const stop = () => {
   if (stopService) stopService()
   if (workerThreadService) workerThreadService.stop()
+  return Promise.resolve()
 }
 
 let initializeWasCalled = false

lib/shared/types.ts

@@ -673,4 +673,4 @@ export let version: string
 // Unlike node, Deno lacks the necessary APIs to clean up child processes
 // automatically. You must manually call stop() in Deno when you're done
 // using esbuild or Deno will continue running forever.
-export declare function stop(): void;
+export declare function stop(): Promise<void>

scripts/deno-tests.js

@@ -37,7 +37,7 @@ function test(name, backends, fn) {
             await fn({ esbuild: esbuildNative, testDir })
             await Deno.remove(testDir, { recursive: true }).catch(() => null)
           } finally {
-            esbuildNative.stop()
+            await esbuildNative.stop()
           }
         })
         break
@@ -51,7 +51,7 @@ function test(name, backends, fn) {
             await fn({ esbuild: esbuildWASM, testDir })
             await Deno.remove(testDir, { recursive: true }).catch(() => null)
           } finally {
-            esbuildWASM.stop()
+            await esbuildWASM.stop()
           }
         })
         break
@@ -65,7 +65,7 @@ function test(name, backends, fn) {
             await fn({ esbuild: esbuildWASM, testDir })
             await Deno.remove(testDir, { recursive: true }).catch(() => null)
           } finally {
-            esbuildWASM.stop()
+            await esbuildWASM.stop()
           }
         })
         break