fix issues reported by eslint

.eslintrc.js

@@ -0,0 +1,19 @@
+module.exports = {
+    "env": {
+        "commonjs": true,
+        "es6": true,
+        "node": true
+    },
+    "extends": "eslint:recommended",
+    "globals": {
+        "Atomics": "readonly",
+        "SharedArrayBuffer": "readonly"
+    },
+    "parserOptions": {
+        "ecmaVersion": 2018
+    },
+    "rules": {
+       "no-console": "off",
+       "semi": "warn",
+    }
+};

index.js

@@ -16,16 +16,6 @@ function monotonicTime() {
   return mono;
 }
 
-var appendJournal = (function() {
-  let lastJournalText = null;
-  return function appendJournal(text) {
-    if (text !== lastJournalText) {
-      fs.appendFileSync('journal/journal.txt', text + '\n');
-      lastJournalText = text;
-    }
-  };
-})();
-
 function logDbError(label) {
   return function(err) {
     console.error(label + ':', ((err && err.message) || err));
@@ -124,29 +114,7 @@ function waitForAnyGameUpdate() {
 }
 
 function waitFor(duration) {
-  return new Promise((resolve, reject) => setTimeout(() => { resolve(); }, duration));
-}
-
-function checkString(value, label, dflt) {
-  try {
-    if (arguments.length >= 3 && (value === undefined || value === null)) {
-      return dflt;
-    } else if (typeof value === 'string') {
-      return value;
-    }
-  } catch (err) {}
-  throw { message: `${label || 'value'} should be a string` };
-}
-
-function checkInteger(value, label, dflt) {
-  try {
-    if (arguments.length >= 3 && (value === undefined || value === null)) {
-      return dflt;
-    } else if (Number.isInteger(value)) {
-      return value;
-    }
-  } catch(err) {}
-  throw { message: `${label || 'value'} should be an integer` };
+  return new Promise((resolve) => setTimeout(() => { resolve(); }, duration));
 }
 
 function catchExceptionsJson(wrapped) {
@@ -171,10 +139,10 @@ function catchExceptionsJson(wrapped) {
     } catch (err) {
       internalErrorJson(err);
     }
-  }
+  };
 }
 
-async function getGameListHandler(req, res, next) {
+async function getGameListHandler(req, res) {
   res.set('Cache-Control', 'no-store');
 
   const afterTime =
@@ -191,7 +159,7 @@ async function getGameListHandler(req, res, next) {
 
   const pollTimeout = waitFor(POLLING_TIMEOUT).then(() => 'timeout').catch(()=>{});
 
-  while (true) {
+  for (;;) {
     /* Save the async promise _before_ the query so we don't miss any updates while suspended. */
     const gameUpdate = waitForAnyGameUpdate().then(() => 'update');
 
@@ -226,7 +194,7 @@ async function getGameListHandler(req, res, next) {
   }
 }
 
-async function getGameHandler(req, res, next) {
+async function getGameHandler(req, res) {
   res.set('Cache-Control', 'no-store');
 
   const gameId = req.params.gameId;
@@ -248,7 +216,7 @@ async function getGameHandler(req, res, next) {
 
   const pollTimeout = waitFor(POLLING_TIMEOUT).then(() => 'timeout').catch(()=>{});
 
-  while (true) {
+  for (;;) {
     /* Save the async promise _before_ the query so we don't miss any updates while suspended. */
     const gameUpdate = waitForGameUpdate(gameId).then(() => 'update');
 
@@ -286,7 +254,7 @@ const updateTemplate = {
   moves(x) { return Number.isInteger(x); },
   status(x) { return typeof x === 'string'; },
   timestamp(x) { return Number.isInteger(x); },
-  board(x) { return true; },
+  board(/*x*/) { return true; },
   modified(x) { return Number.isInteger(x); },
 };
 
@@ -311,7 +279,7 @@ function validateUpdate(body) {
   return body;
 }
 
-async function postGameHandler(req, res, next) {
+async function postGameHandler(req, res) {
   res.set('Cache-Control', 'no-store');
 
   const gameId = req.params.gameId;
@@ -344,8 +312,6 @@ async function postGameHandler(req, res, next) {
 
   let setClause = '';
   let whereClause = '';
-  let hasBoard = false;
-  let hasMeta = false;
 
   for (const key in body) {
     if (key !== 'modified') {
@@ -354,10 +320,8 @@ async function postGameHandler(req, res, next) {
       }
       if (key === 'board') {
         params['$' + key] = JSON.stringify(body[key]);
-        hasBoard = true;
       } else {
         params['$' + key] = body[key];
-        hasMeta = true;
       }
       if (setClause !== '') {
         setClause += ', ';
@@ -381,7 +345,7 @@ async function postGameHandler(req, res, next) {
     ON CONFLICT (gameId) DO UPDATE SET ${setClause}, modified = $time
       WHERE (${whereClause}) AND modified = $modified
   `;
-  const selectSql = `SELECT * FROM games WHERE gameId = $gameId`
+  const selectSql = `SELECT * FROM games WHERE gameId = $gameId`;
   let transactionP;
   db.serialize(() => {
     /* Important: We need to start all these queries without waiting in between. */
@@ -445,7 +409,7 @@ try {
          maxAge: 0,
       }));
    }
-} catch (err) {}
+} catch (err) {/*ignore*/}
 
 var config = { port: process.env.OPENSHIFT_NODEJS_PORT || process.env.VCAP_APP_PORT || process.env.PORT || process.argv[2] || 8765 };