Review markups

This change makes some linting review markups:

  - pre-comupte long, concatenated strings
  - only allow one statement per line

.eslintrc.js

@@ -26,6 +26,8 @@ const SHAREDB_RULES = {
   ],
   // Google overrides the default ESLint behaviour here, which is slightly better for catching erroneously unused variables
   'no-unused-vars': ['error', {vars: 'all', args: 'after-used'}],
+  // It's more readable to ensure we only have one statement per line
+  'max-statements-per-line': ['error', {max: 1}],
   // as-needed quote props are easier to write
   'quote-props': ['error', 'as-needed'],
   'require-jsdoc': 'off',

lib/agent.js

@@ -332,7 +332,9 @@ Agent.prototype._handleMessage = function(request, callback) {
 };
 function getQueryOptions(request) {
   var results = request.r;
-  var ids; var fetch; var fetchOps;
+  var ids;
+  var fetch;
+  var fetchOps;
   if (results) {
     ids = [];
     for (var i = 0; i < results.length; i++) {

lib/backend.js

@@ -15,6 +15,13 @@ var SubmitRequest = require('./submit-request');
 var warnDeprecatedDoc = true;
 var warnDeprecatedAfterSubmit = true;
 
+var DOC_ACTION_DEPRECATION_WARNING = 'DEPRECATED: "doc" middleware action. Use "readSnapshots" instead. ' +
+  'Pass `disableDocAction: true` option to ShareDB to disable the "doc" action and this warning.';
+
+var AFFTER_SUBMIT_ACTION_DEPRECATION_WARNING = 'DEPRECATED: "after submit" middleware action. ' +
+  'Use "afterSubmit" instead. Pass `disableSpaceDelimitedActions: true` option to ShareDB to ' +
+  'disable the "after submit" action and this warning.';
+
 function Backend(options) {
   if (!(this instanceof Backend)) return new Backend(options);
   emitter.EventEmitter.call(this);
@@ -94,10 +101,7 @@ Backend.prototype.SNAPSHOT_TYPES = {
 Backend.prototype._shimDocAction = function() {
   if (warnDeprecatedDoc) {
     warnDeprecatedDoc = false;
-    console.warn([
-      'DEPRECATED: "doc" middleware action. Use "readSnapshots" instead.',
-      'Pass `disableDocAction: true` option to ShareDB to disable the "doc" action and this warning.'
-    ].join(' '));
+    console.warn(DOC_ACTION_DEPRECATION_WARNING);
   }
 
   var backend = this;
@@ -114,10 +118,7 @@ Backend.prototype._shimDocAction = function() {
 Backend.prototype._shimAfterSubmit = function() {
   if (warnDeprecatedAfterSubmit) {
     warnDeprecatedAfterSubmit = false;
-    console.warn([
-      'DEPRECATED: "after submit" middleware action. Use "afterSubmit" instead. Pass',
-      '`disableSpaceDelimitedActions: true` option to ShareDB to disable the "after submit" action and this warning.'
-    ].join(' '));
+    console.warn(AFFTER_SUBMIT_ACTION_DEPRECATION_WARNING);
   }
 
   var backend = this;