fix: Handle not-last takeUntil.

Author: cartant

source/rules/rxjsPreferAngularTakeuntilRule.ts

@@ -181,7 +181,7 @@ export class Rule extends Lint.Rules.TypedRule {
       pipedOperators.forEach((pipedOperator) => {
         if (tsutils.isCallExpression(pipedOperator)) {
           const { found, name } = this.checkOperator(options, pipedOperator);
-          takeUntilFound = found;
+          takeUntilFound = takeUntilFound || found;
           if (name) {
             addDestroySubjectName(name);
           }

test/v6/fixtures/prefer-angular-takeuntil/default/fixture.ts.lint

@@ -1,6 +1,6 @@
 import { Component, OnDestroy } from "@angular/core";
 import { of, Subject } from "rxjs";
-import { switchMap, takeUntil } from "rxjs/operators";
+import { map, switchMap, takeUntil } from "rxjs/operators";
 
 const a = of("a");
 const b = of("b");
@@ -24,6 +24,24 @@ class CorrectComponent implements OnDestroy {
   }
 }
 
+@Component({
+  selector: "correct-component-not-last"
+})
+class CorrectComponentNotLast implements OnDestroy {
+  private destroy = new Subject<void>();
+  someMethod() {
+    a.pipe(
+      switchMap(_ => b),
+      takeUntil(this.destroy),
+      map(value => value)
+    ).subscribe();
+  }
+  ngOnDestroy() {
+    this.destroy.next();
+    this.destroy.complete();
+  }
+}
+
 @Component({
   selector: "destructured-component"
 })