SERVER-70553 Add module support to jstests

.eslintrc.yml

@@ -2,6 +2,10 @@ env:
   es6: true
   mongo: true
 
+parserOptions:
+  ecmaVersion: 6
+  sourceType: "module"
+
 rules:
   # Rules are documented at http://eslint.org/docs/rules/
   no-cond-assign: 2

jstests/replsets/libs/secondary_reads_test.js

@@ -99,8 +99,8 @@ function SecondaryReadsTest(name = "secondary_reads_test") {
         assert.gt(readers.length, 0, "no readers to stop");
         assert.commandWorked(primaryDB.getCollection(signalColl).insert({_id: testDoneId}));
         for (let i = 0; i < readers.length; i++) {
-            const await = readers[i];
-            await ();
+            const awaitReader = readers[i];
+            awaitReader();
             print("reader " + i + " done");
         }
         readers = [];