diff --git a/.eslintrc b/.eslintrc
index feb1e8207..ff2bd1019 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -35,10 +35,12 @@
 
     // Possible errors
     "for-direction": "error",
+    "getter-return": "error",
     "no-async-promise-executor": "error",
     "no-cond-assign": ["error", "except-parens"],
     "no-constant-condition": ["error", { "checkLoops": false, }],
     "no-dupe-args": "error",
+    "no-dupe-else-if": "error",
     "no-dupe-keys": "error",
     "no-duplicate-case": "error",
     "no-empty": ["error", { "allowEmptyCatch": true, }],
@@ -51,6 +53,7 @@
     "no-irregular-whitespace": "error",
     "no-obj-calls": "error",
     "no-regex-spaces": "error",
+    "no-setter-return": "error",
     "no-sparse-arrays": "error",
     "no-unexpected-multiline": "error",
     "no-unreachable": "error",
diff --git a/src/core/cmap.js b/src/core/cmap.js
index 1c0fe238b..190e961ae 100644
--- a/src/core/cmap.js
+++ b/src/core/cmap.js
@@ -394,7 +394,7 @@ class IdentityCMap extends CMap {
     return 0x10000;
   }
 
-  get isIdentityCMap() {
+  get isIdentityCMap() { // eslint-disable-line getter-return
     unreachable('should not access .isIdentityCMap');
   }
 }
diff --git a/src/display/font_loader.js b/src/display/font_loader.js
index d7088fc0f..1cb27d0c7 100644
--- a/src/display/font_loader.js
+++ b/src/display/font_loader.js
@@ -106,15 +106,15 @@ class BaseFontLoader {
     unreachable('Abstract method `_queueLoadingCallback`.');
   }
 
-  get isFontLoadingAPISupported() {
+  get isFontLoadingAPISupported() { // eslint-disable-line getter-return
     unreachable('Abstract method `isFontLoadingAPISupported`.');
   }
 
-  get isSyncFontLoadingSupported() {
+  get isSyncFontLoadingSupported() { // eslint-disable-line getter-return
     unreachable('Abstract method `isSyncFontLoadingSupported`.');
   }
 
-  get _loadTestFont() {
+  get _loadTestFont() { // eslint-disable-line getter-return
     unreachable('Abstract method `_loadTestFont`.');
   }
 
diff --git a/web/interfaces.js b/web/interfaces.js
index 4a027faea..5c5f16d52 100644
--- a/web/interfaces.js
+++ b/web/interfaces.js
@@ -12,6 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+/* eslint-disable getter-return */
 
 /**
  * @interface