diff --git a/lib/tsc.js b/lib/tsc.js
index 5657f76539d..ff7e9acacf1 100644
--- a/lib/tsc.js
+++ b/lib/tsc.js
@@ -903,10 +903,10 @@ var ts;
         }
         for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
             var arg = args_1[_a];
-            for (var _b = 0, _c = getOwnKeys(arg); _b < _c.length; _b++) {
-                var p = _c[_b];
-                t[p] = arg[p];
-            }
+            for (var p in arg)
+                if (hasProperty(arg, p)) {
+                    t[p] = arg[p];
+                }
         }
         return t;
     }
@@ -55377,7 +55377,7 @@ var ts;
             var seenKnownKeys = 0;
             var nameColumn = [];
             var descriptionColumn = [];
-            var knownKesyCount = ts.getOwnKeys(configurations.compilerOptions).length;
+            var knownKeysCount = ts.getOwnKeys(configurations.compilerOptions).length;
             for (var category in categorizedOptions) {
                 if (nameColumn.length !== 0) {
                     nameColumn.push("");
@@ -55389,7 +55389,7 @@ var ts;
                     var option = _a[_i];
                     var optionName = void 0;
                     if (ts.hasProperty(configurations.compilerOptions, option.name)) {
-                        optionName = "\"" + option.name + "\": " + JSON.stringify(configurations.compilerOptions[option.name]) + ((seenKnownKeys += 1) === knownKesyCount ? "" : ",");
+                        optionName = "\"" + option.name + "\": " + JSON.stringify(configurations.compilerOptions[option.name]) + ((seenKnownKeys += 1) === knownKeysCount ? "" : ",");
                     }
                     else {
                         optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
diff --git a/lib/tsserver.js b/lib/tsserver.js
index 4a147d802c6..ac009da1e33 100644
--- a/lib/tsserver.js
+++ b/lib/tsserver.js
@@ -1874,10 +1874,10 @@ var ts;
         }
         for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
             var arg = args_1[_a];
-            for (var _b = 0, _c = getOwnKeys(arg); _b < _c.length; _b++) {
-                var p = _c[_b];
-                t[p] = arg[p];
-            }
+            for (var p in arg)
+                if (hasProperty(arg, p)) {
+                    t[p] = arg[p];
+                }
         }
         return t;
     }
@@ -56758,7 +56758,7 @@ var ts;
             var seenKnownKeys = 0;
             var nameColumn = [];
             var descriptionColumn = [];
-            var knownKesyCount = ts.getOwnKeys(configurations.compilerOptions).length;
+            var knownKeysCount = ts.getOwnKeys(configurations.compilerOptions).length;
             for (var category in categorizedOptions) {
                 if (nameColumn.length !== 0) {
                     nameColumn.push("");
@@ -56770,7 +56770,7 @@ var ts;
                     var option = _a[_i];
                     var optionName = void 0;
                     if (ts.hasProperty(configurations.compilerOptions, option.name)) {
-                        optionName = "\"" + option.name + "\": " + JSON.stringify(configurations.compilerOptions[option.name]) + ((seenKnownKeys += 1) === knownKesyCount ? "" : ",");
+                        optionName = "\"" + option.name + "\": " + JSON.stringify(configurations.compilerOptions[option.name]) + ((seenKnownKeys += 1) === knownKeysCount ? "" : ",");
                     }
                     else {
                         optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
diff --git a/lib/tsserverlibrary.js b/lib/tsserverlibrary.js
index 0c5dd6f12a5..4158ed56f5d 100644
--- a/lib/tsserverlibrary.js
+++ b/lib/tsserverlibrary.js
@@ -1874,10 +1874,10 @@ var ts;
         }
         for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
             var arg = args_1[_a];
-            for (var _b = 0, _c = getOwnKeys(arg); _b < _c.length; _b++) {
-                var p = _c[_b];
-                t[p] = arg[p];
-            }
+            for (var p in arg)
+                if (hasProperty(arg, p)) {
+                    t[p] = arg[p];
+                }
         }
         return t;
     }
@@ -6757,7 +6757,7 @@ var ts;
             var seenKnownKeys = 0;
             var nameColumn = [];
             var descriptionColumn = [];
-            var knownKesyCount = ts.getOwnKeys(configurations.compilerOptions).length;
+            var knownKeysCount = ts.getOwnKeys(configurations.compilerOptions).length;
             for (var category in categorizedOptions) {
                 if (nameColumn.length !== 0) {
                     nameColumn.push("");
@@ -6769,7 +6769,7 @@ var ts;
                     var option = _a[_i];
                     var optionName = void 0;
                     if (ts.hasProperty(configurations.compilerOptions, option.name)) {
-                        optionName = "\"" + option.name + "\": " + JSON.stringify(configurations.compilerOptions[option.name]) + ((seenKnownKeys += 1) === knownKesyCount ? "" : ",");
+                        optionName = "\"" + option.name + "\": " + JSON.stringify(configurations.compilerOptions[option.name]) + ((seenKnownKeys += 1) === knownKeysCount ? "" : ",");
                     }
                     else {
                         optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
diff --git a/lib/typescript.js b/lib/typescript.js
index 0dbe9852df8..f02436ba2f2 100644
--- a/lib/typescript.js
+++ b/lib/typescript.js
@@ -2165,10 +2165,10 @@ var ts;
         }
         for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
             var arg = args_1[_a];
-            for (var _b = 0, _c = getOwnKeys(arg); _b < _c.length; _b++) {
-                var p = _c[_b];
-                t[p] = arg[p];
-            }
+            for (var p in arg)
+                if (hasProperty(arg, p)) {
+                    t[p] = arg[p];
+                }
         }
         return t;
     }
@@ -68991,7 +68991,7 @@ var ts;
             var seenKnownKeys = 0;
             var nameColumn = [];
             var descriptionColumn = [];
-            var knownKesyCount = ts.getOwnKeys(configurations.compilerOptions).length;
+            var knownKeysCount = ts.getOwnKeys(configurations.compilerOptions).length;
             for (var category in categorizedOptions) {
                 if (nameColumn.length !== 0) {
                     nameColumn.push("");
@@ -69003,7 +69003,7 @@ var ts;
                     var option = _a[_i];
                     var optionName = void 0;
                     if (ts.hasProperty(configurations.compilerOptions, option.name)) {
-                        optionName = "\"" + option.name + "\": " + JSON.stringify(configurations.compilerOptions[option.name]) + ((seenKnownKeys += 1) === knownKesyCount ? "" : ",");
+                        optionName = "\"" + option.name + "\": " + JSON.stringify(configurations.compilerOptions[option.name]) + ((seenKnownKeys += 1) === knownKeysCount ? "" : ",");
                     }
                     else {
                         optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
diff --git a/lib/typescriptServices.js b/lib/typescriptServices.js
index 0dbe9852df8..f02436ba2f2 100644
--- a/lib/typescriptServices.js
+++ b/lib/typescriptServices.js
@@ -2165,10 +2165,10 @@ var ts;
         }
         for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
             var arg = args_1[_a];
-            for (var _b = 0, _c = getOwnKeys(arg); _b < _c.length; _b++) {
-                var p = _c[_b];
-                t[p] = arg[p];
-            }
+            for (var p in arg)
+                if (hasProperty(arg, p)) {
+                    t[p] = arg[p];
+                }
         }
         return t;
     }
@@ -68991,7 +68991,7 @@ var ts;
             var seenKnownKeys = 0;
             var nameColumn = [];
             var descriptionColumn = [];
-            var knownKesyCount = ts.getOwnKeys(configurations.compilerOptions).length;
+            var knownKeysCount = ts.getOwnKeys(configurations.compilerOptions).length;
             for (var category in categorizedOptions) {
                 if (nameColumn.length !== 0) {
                     nameColumn.push("");
@@ -69003,7 +69003,7 @@ var ts;
                     var option = _a[_i];
                     var optionName = void 0;
                     if (ts.hasProperty(configurations.compilerOptions, option.name)) {
-                        optionName = "\"" + option.name + "\": " + JSON.stringify(configurations.compilerOptions[option.name]) + ((seenKnownKeys += 1) === knownKesyCount ? "" : ",");
+                        optionName = "\"" + option.name + "\": " + JSON.stringify(configurations.compilerOptions[option.name]) + ((seenKnownKeys += 1) === knownKeysCount ? "" : ",");
                     }
                     else {
                         optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";
diff --git a/lib/typingsInstaller.js b/lib/typingsInstaller.js
index 15da40d45c1..62f0c62c745 100644
--- a/lib/typingsInstaller.js
+++ b/lib/typingsInstaller.js
@@ -913,10 +913,10 @@ var ts;
         }
         for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
             var arg = args_1[_a];
-            for (var _b = 0, _c = getOwnKeys(arg); _b < _c.length; _b++) {
-                var p = _c[_b];
-                t[p] = arg[p];
-            }
+            for (var p in arg)
+                if (hasProperty(arg, p)) {
+                    t[p] = arg[p];
+                }
         }
         return t;
     }
@@ -5777,7 +5777,7 @@ var ts;
             var seenKnownKeys = 0;
             var nameColumn = [];
             var descriptionColumn = [];
-            var knownKesyCount = ts.getOwnKeys(configurations.compilerOptions).length;
+            var knownKeysCount = ts.getOwnKeys(configurations.compilerOptions).length;
             for (var category in categorizedOptions) {
                 if (nameColumn.length !== 0) {
                     nameColumn.push("");
@@ -5789,7 +5789,7 @@ var ts;
                     var option = _a[_i];
                     var optionName = void 0;
                     if (ts.hasProperty(configurations.compilerOptions, option.name)) {
-                        optionName = "\"" + option.name + "\": " + JSON.stringify(configurations.compilerOptions[option.name]) + ((seenKnownKeys += 1) === knownKesyCount ? "" : ",");
+                        optionName = "\"" + option.name + "\": " + JSON.stringify(configurations.compilerOptions[option.name]) + ((seenKnownKeys += 1) === knownKeysCount ? "" : ",");
                     }
                     else {
                         optionName = "// \"" + option.name + "\": " + JSON.stringify(getDefaultValueForOption(option)) + ",";