diff --git a/.eslintrc.js b/.eslintrc.js
index 5a93758a..b8f8b181 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -134,15 +134,16 @@ module.exports = {
           { "selector": "typeLike", "format": ["PascalCase"] },
           { "selector": "interface", "format": ["PascalCase"], "prefix": ["I"] },
         ],
+        "@typescript-eslint/explicit-function-return-type": [
+          "error",
+          {
+            "allowExpressions": true
+          }
+        ],
         "@typescript-eslint/tslint/config": [
             "error",
             {
                 "rules": {
-                    "typedef": [
-                        true,
-                        "call-signature",
-                        "parameter"
-                    ],
                     "whitespace": [
                         true,
                         "check-branch",
diff --git a/src/Terminal.ts b/src/Terminal.ts
index 37de6afc..89fbf1e0 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -419,7 +419,7 @@ export class Terminal extends Disposable implements ITerminal, IDisposable, IInp
       }
       copyHandler(event, this._selectionService);
     }));
-    const pasteHandlerWrapper = (event: ClipboardEvent) => handlePasteEvent(event, this.textarea, this.bracketedPasteMode, this._coreService);
+    const pasteHandlerWrapper = (event: ClipboardEvent): void => handlePasteEvent(event, this.textarea, this.bracketedPasteMode, this._coreService);
     this.register(addDisposableDomListener(this.textarea, 'paste', pasteHandlerWrapper));
     this.register(addDisposableDomListener(this.element, 'paste', pasteHandlerWrapper));
 
diff --git a/src/common/TestUtils.test.ts b/src/common/TestUtils.test.ts
index 5695dcdd..cf0979f7 100644
--- a/src/common/TestUtils.test.ts
+++ b/src/common/TestUtils.test.ts
@@ -116,7 +116,7 @@ export class MockUnicodeService implements IUnicodeService {
   versions: string[] = [];
   activeVersion: string = '';
   onChange: IEvent<string> = new EventEmitter<string>().event;
-  wcwidth = (codepoint: number) => this._provider.wcwidth(codepoint);
+  wcwidth = (codepoint: number): number => this._provider.wcwidth(codepoint);
   getStringCellWidth(s: string): number {
     throw new Error('Method not implemented.');
   }
diff --git a/src/common/parser/EscapeSequenceParser.ts b/src/common/parser/EscapeSequenceParser.ts
index d41b6452..96d206b9 100644
--- a/src/common/parser/EscapeSequenceParser.ts
+++ b/src/common/parser/EscapeSequenceParser.ts
@@ -82,7 +82,7 @@ export const VT500_TRANSITION_TABLE = (function (): TransitionTable {
   // range macro for byte
   const BYTE_VALUES = 256;
   const blueprint = Array.apply(null, Array(BYTE_VALUES)).map((unused: any, i: number) => i);
-  const r = (start: number, end: number) => blueprint.slice(start, end);
+  const r = (start: number, end: number): number[] => blueprint.slice(start, end);
 
   // Default definitions.
   const PRINTABLES = r(0x20, 0x7f); // 0x20 (SP) included, 0x7F (DEL) excluded