diff --git a/.eslintrc b/.eslintrc
index 87c93f7030b..feb8cd9754a 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -67,7 +67,7 @@
         "complexity": "off",
         "constructor-super": "error",
         "curly": ["error", "multi-line"],
-        "dot-notation": "off",
+        "dot-notation": "error",
         "eol-last": "off",
         "eqeqeq": "error",
         "guard-for-in": "off",
diff --git a/scripts/authors.ts b/scripts/authors.ts
index c05d7106913..34b7ab766b5 100644
--- a/scripts/authors.ts
+++ b/scripts/authors.ts
@@ -169,7 +169,7 @@ var args = process.argv.slice(2);
 if (args.length < 1) {
     console.log('Usage: node authors.js [command]');
     console.log('List of commands: ');
-    Object.keys(Commands).forEach(k => console.log(`     ${k}: ${(Commands as any)[k]['description']}`));
+    Object.keys(Commands).forEach(k => console.log(`     ${k}: ${(Commands as any)[k].description}`));
 } else {
     var cmd: Function = (Commands as any)[args[0]];
     if (cmd === undefined) {
diff --git a/scripts/errorCheck.ts b/scripts/errorCheck.ts
index a5cb27417f1..92e738c00ba 100644
--- a/scripts/errorCheck.ts
+++ b/scripts/errorCheck.ts
@@ -13,7 +13,7 @@ fs.readFile('src/compiler/diagnosticMessages.json', 'utf-8', (err, data) => {
     console.log('Loaded ' + keys.length + ' errors');
 
     for (let k of keys) {
-        messages[k]['seen'] = false;
+        messages[k].seen = false;
     }
 
     let errRegex = /\(\d+,\d+\): error TS([^:]+):/g;
@@ -30,7 +30,7 @@ fs.readFile('src/compiler/diagnosticMessages.json', 'utf-8', (err, data) => {
                 while (g = errRegex.exec(baseline)) {
                     var errCode = +g[1];
                     let msg = keys.filter(k => messages[k].code === errCode)[0];
-                    messages[msg]['seen'] = true;
+                    messages[msg].seen = true;
                 }
 
                 done();
@@ -41,7 +41,7 @@ fs.readFile('src/compiler/diagnosticMessages.json', 'utf-8', (err, data) => {
             console.log('== List of errors not present in baselines ==');
             let count = 0;
             for (let k of keys) {
-                if (messages[k]['seen'] !== true) {
+                if (messages[k].seen !== true) {
                     console.log(k);
                     count++;
                 }
diff --git a/scripts/importDefinitelyTypedTests/importDefinitelyTypedTests.ts b/scripts/importDefinitelyTypedTests/importDefinitelyTypedTests.ts
index 3fa36faab2f..f14eff609b1 100644
--- a/scripts/importDefinitelyTypedTests/importDefinitelyTypedTests.ts
+++ b/scripts/importDefinitelyTypedTests/importDefinitelyTypedTests.ts
@@ -53,7 +53,7 @@ function importDefinitelyTypedTest(tscPath: string, rwcTestPath: string, testCas
     }
 
     let testDirectoryName = testCaseName + "_" + Math.floor((Math.random() * 10000) + 1);
-    let testDirectoryPath = path.join(process.env["temp"], testDirectoryName);
+    let testDirectoryPath = path.join(process.env.temp, testDirectoryName);
     if (fs.existsSync(testDirectoryPath)) {
         throw new Error("Could not create test directory");
     }