diff --git a/.eslintrc b/.eslintrc
index 914c0d76a7a..a3ed20a4ebe 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -107,7 +107,7 @@
         "no-trailing-spaces": "error",
         "no-undef-init": "error",
         "no-unsafe-finally": "error",
-        "no-unused-expressions": "off",
+        "no-unused-expressions": "error",
         "no-unused-labels": "error",
         "no-var": "off",
         "object-shorthand": "error",
diff --git a/src/compiler/factory.ts b/src/compiler/factory.ts
index b30f40b912d..ec14260c6f5 100644
--- a/src/compiler/factory.ts
+++ b/src/compiler/factory.ts
@@ -2942,7 +2942,7 @@ namespace ts {
             node.declarationMapPath = declarationMapPath;
             node.declarationMapText = declarationMapTextOrBuildInfoPath;
             node.javascriptPath = javascriptPath;
-            node.declarationPath = declarationPath,
+            node.declarationPath = declarationPath;
             node.buildInfoPath = buildInfoPath;
             node.buildInfo = buildInfo;
             node.oldFileOfCurrentEmit = oldFileOfCurrentEmit;
diff --git a/src/compiler/watch.ts b/src/compiler/watch.ts
index 3ba2a5f5959..d8af9bade36 100644
--- a/src/compiler/watch.ts
+++ b/src/compiler/watch.ts
@@ -331,7 +331,9 @@ namespace ts {
     export function createProgramHost<T extends BuilderProgram = EmitAndSemanticDiagnosticsBuilderProgram>(system: System, createProgram: CreateProgram<T> | undefined): ProgramHost<T> {
         const getDefaultLibLocation = memoize(() => getDirectoryPath(normalizePath(system.getExecutingFilePath())));
         let host: DirectoryStructureHost = system;
-        host; // tslint:disable-line no-unused-expression (TODO: `host` is unused!)
+        // TODO: `host` is unused!
+        // eslint-disable-next-line no-unused-expressions
+        host;
         return {
             useCaseSensitiveFileNames: () => system.useCaseSensitiveFileNames,
             getNewLine: () => system.newLine,
diff --git a/src/services/refactors/generateGetAccessorAndSetAccessor.ts b/src/services/refactors/generateGetAccessorAndSetAccessor.ts
index dbc73781871..4091599951a 100644
--- a/src/services/refactors/generateGetAccessorAndSetAccessor.ts
+++ b/src/services/refactors/generateGetAccessorAndSetAccessor.ts
@@ -214,11 +214,17 @@ namespace ts.refactor.generateGetAccessorAndSetAccessor {
     }
 
     function insertAccessor(changeTracker: textChanges.ChangeTracker, file: SourceFile, accessor: AccessorDeclaration, declaration: AcceptedDeclaration, container: ContainerDeclaration) {
-        isParameterPropertyDeclaration(declaration)
-            ? changeTracker.insertNodeAtClassStart(file, <ClassLikeDeclaration>container, accessor)
-            : isPropertyAssignment(declaration)
-                ? changeTracker.insertNodeAfterComma(file, declaration, accessor)
-                : changeTracker.insertNodeAfter(file, declaration, accessor);
+        if (isParameterPropertyDeclaration(declaration)) {
+            changeTracker.insertNodeAtClassStart(file, <ClassLikeDeclaration>container, accessor);
+        }
+        else {
+            if (isPropertyAssignment(declaration)) {
+                changeTracker.insertNodeAfterComma(file, declaration, accessor);
+            }
+            else {
+                changeTracker.insertNodeAfter(file, declaration, accessor);
+            }
+        }
     }
 
     function updateReadonlyPropertyInitializerStatementConstructor(changeTracker: textChanges.ChangeTracker, file: SourceFile, constructor: ConstructorDeclaration, fieldName: string, originalName: string) {
diff --git a/src/testRunner/parallel/worker.ts b/src/testRunner/parallel/worker.ts
index 7579242ffaa..2a53ccddffe 100644
--- a/src/testRunner/parallel/worker.ts
+++ b/src/testRunner/parallel/worker.ts
@@ -125,7 +125,10 @@ namespace Harness.Parallel.Worker {
             }
 
             function addTest(title: string | Mocha.Func | Mocha.AsyncFunc, fn: Mocha.Func | Mocha.AsyncFunc | undefined): Mocha.Test {
-                if (typeof title === "function") fn = title, title = fn.name;
+                if (typeof title === "function") {
+                    fn = title;
+                    title = fn.name;
+                }
                 const test = new Test(title, suites[0].pending ? undefined : fn);
                 suites[0].addTest(test);
                 return test;
@@ -297,4 +300,4 @@ namespace Harness.Parallel.Worker {
 
         process.on("message", processHostMessage);
     }
-}
\ No newline at end of file
+}
diff --git a/src/testRunner/unittests/services/languageService.ts b/src/testRunner/unittests/services/languageService.ts
index d646f32383f..8f67c1406e5 100644
--- a/src/testRunner/unittests/services/languageService.ts
+++ b/src/testRunner/unittests/services/languageService.ts
@@ -40,7 +40,7 @@ export function Component(x: Config): any;`
                 },
             });
             const definitions = languageService.getDefinitionAtPosition("foo.ts", 160); // 160 is the latter `vueTemplateHtml` position
-            expect(definitions).to.exist; // tslint:disable-line no-unused-expression
+            expect(definitions).to.exist; // eslint-disable-line no-unused-expressions
         });
     });
 }
diff --git a/src/testRunner/unittests/services/preProcessFile.ts b/src/testRunner/unittests/services/preProcessFile.ts
index 3e9d16672db..c0a47779837 100644
--- a/src/testRunner/unittests/services/preProcessFile.ts
+++ b/src/testRunner/unittests/services/preProcessFile.ts
@@ -44,7 +44,7 @@ describe("unittests:: services:: PreProcessFile:", () => {
                     ambientExternalModules: undefined,
                     isLibFile: false
                 });
-        }),
+        });
 
         it("Do not return reference path because of invalid triple-slash syntax", () => {
             test("///<reference path\"refFile1.ts\" />" + "\n" + "///<reference path =\"refFile2.ts\">" + "\n" + "///<referencepath=\"refFile3.ts\" />" + "\n" + "///<reference pat= \"refFile4d.ts\" />",
@@ -58,7 +58,7 @@ describe("unittests:: services:: PreProcessFile:", () => {
                     ambientExternalModules: undefined,
                     isLibFile: false
                 });
-        }),
+        });
 
         it("Do not return reference path of non-imports", () => {
             test("Quill.import('delta');",
@@ -72,7 +72,7 @@ describe("unittests:: services:: PreProcessFile:", () => {
                     ambientExternalModules: undefined,
                     isLibFile: false
                 });
-        }),
+        });
 
         it("Do not return reference path of nested non-imports", () => {
             test("a.b.import('c');",
@@ -86,7 +86,7 @@ describe("unittests:: services:: PreProcessFile:", () => {
                     ambientExternalModules: undefined,
                     isLibFile: false
                 });
-        }),
+        });
 
         it("Correctly return imported files", () => {
             test("import i1 = require(\"r1.ts\"); import i2 =require(\"r2.ts\"); import i3= require(\"r3.ts\"); import i4=require(\"r4.ts\"); import i5 = require  (\"r5.ts\");",
@@ -101,7 +101,7 @@ describe("unittests:: services:: PreProcessFile:", () => {
                     ambientExternalModules: undefined,
                     isLibFile: false
                 });
-        }),
+        });
 
         it("Do not return imported files if readImportFiles argument is false", () => {
             test("import i1 = require(\"r1.ts\"); import i2 =require(\"r2.ts\"); import i3= require(\"r3.ts\"); import i4=require(\"r4.ts\"); import i5 = require  (\"r5.ts\");",
@@ -115,7 +115,7 @@ describe("unittests:: services:: PreProcessFile:", () => {
                     ambientExternalModules: undefined,
                     isLibFile: false
                 });
-        }),
+        });
 
         it("Do not return import path because of invalid import syntax", () => {
             test("import i1 require(\"r1.ts\"); import = require(\"r2.ts\") import i3= require(\"r3.ts\"); import i5",
@@ -129,7 +129,7 @@ describe("unittests:: services:: PreProcessFile:", () => {
                     ambientExternalModules: undefined,
                     isLibFile: false
                 });
-        }),
+        });
 
         it("Correctly return referenced files and import files", () => {
             test("///<reference path=\"refFile1.ts\" />" + "\n" + "///<reference path =\"refFile2.ts\"/>" + "\n" + "import i1 = require(\"r1.ts\"); import i2 =require(\"r2.ts\");",
@@ -143,7 +143,7 @@ describe("unittests:: services:: PreProcessFile:", () => {
                     ambientExternalModules: undefined,
                     isLibFile: false
                 });
-        }),
+        });
 
         it("Correctly return referenced files and import files even with some invalid syntax", () => {
             test("///<reference path=\"refFile1.ts\" />" + "\n" + "///<reference path \"refFile2.ts\"/>" + "\n" + "import i1 = require(\"r1.ts\"); import = require(\"r2.ts\"); import i2 = require(\"r3.ts\");",
diff --git a/src/testRunner/unittests/tsserver/session.ts b/src/testRunner/unittests/tsserver/session.ts
index cf84ffce6e8..cc70a910830 100644
--- a/src/testRunner/unittests/tsserver/session.ts
+++ b/src/testRunner/unittests/tsserver/session.ts
@@ -337,7 +337,7 @@ namespace ts.server {
 
                 session.send = Session.prototype.send;
                 assert(session.send);
-                expect(session.send(msg)).to.not.exist; // tslint:disable-line no-unused-expression
+                expect(session.send(msg)).to.not.exist; // eslint-disable-line no-unused-expressions
                 expect(lastWrittenToHost).to.equal(resultMsg);
             });
         });