From ea3564642c88ee8b46f13aa4ffc6994c70fecda7 Mon Sep 17 00:00:00 2001
From: Justin Beckwith <justin.beckwith@gmail.com>
Date: Thu, 20 Sep 2018 12:28:43 -0700
Subject: [PATCH] Enable prefer-const in the eslint config (#337)

---
 .eslintrc.yml                       | 1 +
 samples/system-test/spanner.test.js | 8 ++++----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/.eslintrc.yml b/.eslintrc.yml
index 65f1dce6c..73eeec276 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -12,3 +12,4 @@ rules:
   eqeqeq: error
   no-warning-comments: warn
   no-var: error
+  prefer-const: error
diff --git a/samples/system-test/spanner.test.js b/samples/system-test/spanner.test.js
index 68a6cfc1d..3891a828b 100644
--- a/samples/system-test/spanner.test.js
+++ b/samples/system-test/spanner.test.js
@@ -332,12 +332,12 @@ test.serial(`should create query partitions`, async t => {
   const [transaction] = await database.createBatchTransaction();
   const identifier = JSON.stringify(transaction.identifier());
 
-  let results = await tools.runAsyncWithIO(
+  const results = await tools.runAsyncWithIO(
     `${batchCmd} create-query-partitions ${INSTANCE_ID} ${DATABASE_ID} '${identifier}' ${PROJECT_ID}`,
     cwd
   );
 
-  let output = results.stdout + results.stderr;
+  const output = results.stdout + results.stderr;
 
   t.regex(output, /Successfully created \d query partitions\./);
 
@@ -355,12 +355,12 @@ test.serial(`should execute a partition`, async t => {
   const [partitions] = await transaction.createQueryPartitions(query);
   const partition = JSON.stringify(partitions[0]);
 
-  let results = await tools.runAsyncWithIO(
+  const results = await tools.runAsyncWithIO(
     `${batchCmd} execute-partition ${INSTANCE_ID} ${DATABASE_ID} '${identifier}' '${partition}' ${PROJECT_ID}`,
     cwd
   );
 
-  let output = results.stdout + results.stderr;
+  const output = results.stdout + results.stderr;
 
   t.regex(output, /Successfully received \d from executed partition\./);