blueslip: Apply ESLint.

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>

.eslintignore

@@ -1,3 +1,10 @@
-static/js/blueslip.js
-static/webpack-bundles
-static/js/js_typings/zulip/index.d.ts
+# This is intended for generated files and vendored third-party files.
+# For our source code, instead of adding files here, consider using
+# specific eslint-disable comments in the files themselves.
+
+/docs/_build
+/static/generated
+/static/third
+/static/webpack-bundles
+/var
+/zulip-py3-venv

static/js/blueslip.js

@@ -36,11 +36,10 @@ Logger.prototype = (function () {
                 pad(now.getUTCMilliseconds(), 3) + ' UTC';
 
             var str_args = _.map(arguments, function (x) {
-                if (typeof(x) === 'object') {
+                if (typeof x === 'object') {
                     return JSON.stringify(x);
-                } else {
-                    return x;
                 }
+                return x;
             });
 
             var log_entry = date_str + " " + name.toUpperCase() +
@@ -62,12 +61,12 @@ Logger.prototype = (function () {
     var proto = {
         get_log: function Logger_get_log() {
             return this._memory_log;
-        }
+        },
     };
 
     var methods = ['debug', 'log', 'info', 'warn', 'error'];
     var i;
-    for (i = 0; i < methods.length; i++) {
+    for (i = 0; i < methods.length; i += 1) {
         proto[methods[i]] = make_logger_func(methods[i]);
     }
 
@@ -98,10 +97,9 @@ function report_error(msg, stack, opts) {
 
     var key = ':' + msg + stack;
     if (reported_errors.hasOwnProperty(key)
-        || (last_report_attempt.hasOwnProperty(key)
+        || last_report_attempt.hasOwnProperty(key)
             // Only try to report a given error once every 5 minutes
-            && (Date.now() - last_report_attempt[key] <= 60 * 5 * 1000)))
-    {
+            && Date.now() - last_report_attempt[key] <= 60 * 5 * 1000) {
         return;
     }
 
@@ -115,13 +113,15 @@ function report_error(msg, stack, opts) {
         type: 'POST',
         url: '/json/report/error',
         dataType: 'json',
-        data:     { message: msg,
+        data: {
+            message: msg,
             stacktrace: stack,
             ui_message: opts.show_ui_msg,
             more_info: JSON.stringify(opts.more_info),
             href: window.location.href,
             user_agent: window.navigator.userAgent,
-                    log: logger.get_log().join("\n")},
+            log: logger.get_log().join("\n"),
+        },
         timeout: 3 * 1000,
         success: function () {
             reported_errors[key] = true;
@@ -158,7 +158,7 @@ function report_error(msg, stack, opts) {
                                   "Please try reloading the page.",
                                   $("#home-error"), "alert-error");
             }
-        }
+        },
     });
 
     if (page_params.save_stacktraces) {