fix: prevent possible race condition when killing tasks on failure

Author: iiroj

lib/resolveTaskFn.js

@@ -71,23 +71,25 @@ const killExecaProcess = async (execaProcess) => {
  *
  * @param {Object} ctx
  * @param {execa.ExecaChildProcess<string>} execaChildProcess
- * @returns {() => void} Function that clears the interval that
+ * @returns {() => Promise<void>} Function that clears the interval that
  * checks the context.
  */
 const interruptExecutionOnError = (ctx, execaChildProcess) => {
-  let loopIntervalId
+  let intervalId, killPromise
 
   const loop = async () => {
     if (ctx.errors.size > 0) {
-      clearInterval(loopIntervalId)
-      await killExecaProcess(execaChildProcess)
+      clearInterval(intervalId)
+      killPromise = killExecaProcess(execaChildProcess)
+      await killPromise
     }
   }
 
-  loopIntervalId = setInterval(loop, ERROR_CHECK_INTERVAL)
+  intervalId = setInterval(loop, ERROR_CHECK_INTERVAL)
 
-  return () => {
-    clearInterval(loopIntervalId)
+  return async () => {
+    clearInterval(intervalId)
+    await killPromise
   }
 }
 
@@ -155,7 +157,7 @@ export const resolveTaskFn = ({
 
     const quitInterruptCheck = interruptExecutionOnError(ctx, execaChildProcess)
     const result = await execaChildProcess
-    quitInterruptCheck()
+    await quitInterruptCheck()
 
     if (result.failed || result.killed || result.signal != null) {
       throw makeErr(command, result, ctx)

test/resolveTaskFn.spec.js

@@ -333,6 +333,31 @@ describe('resolveTaskFn', () => {
     `)
   })
 
+  it('should not kill long running tasks without errors in context', async () => {
+    execa.mockImplementationOnce(() =>
+      createExecaReturnValue(
+        {
+          stdout: 'a-ok',
+          stderr: '',
+          code: 0,
+          cmd: 'mock cmd',
+          failed: false,
+          killed: false,
+          signal: null,
+        },
+        1000
+      )
+    )
+
+    const context = getInitialState()
+    const taskFn = resolveTaskFn({ command: 'node' })
+    const taskPromise = taskFn(context)
+
+    jest.runOnlyPendingTimers()
+
+    await expect(taskPromise).resolves.toEqual()
+  })
+
   it('should kill a long running task when an error is added to the context', async () => {
     execa.mockImplementationOnce(() =>
       createExecaReturnValue(