diff --git a/src/content/domains/KeySequence.ts b/src/content/domains/KeySequence.ts
index 61ceab1..abae61a 100644
--- a/src/content/domains/KeySequence.ts
+++ b/src/content/domains/KeySequence.ts
@@ -1,14 +1,9 @@
 import Key from './Key';
 
 export default class KeySequence {
-  private keys: Key[];
-
-  private constructor(keys: Key[]) {
-    this.keys = keys;
-  }
-
-  static from(keys: Key[]): KeySequence {
-    return new KeySequence(keys);
+  constructor(
+    public readonly keys: Key[],
+  ) {
   }
 
   push(key: Key): number {
@@ -31,34 +26,29 @@ export default class KeySequence {
     return true;
   }
 
-  getKeyArray(): Key[] {
-    return this.keys;
-  }
-}
-
-export const fromMapKeys = (keys: string): KeySequence => {
-  const fromMapKeysRecursive = (
-    remainings: string, mappedKeys: Key[],
-  ): Key[] => {
-    if (remainings.length === 0) {
-      return mappedKeys;
-    }
-
-    let nextPos = 1;
-    if (remainings.startsWith('<')) {
-      let ltPos = remainings.indexOf('>');
-      if (ltPos > 0) {
-        nextPos = ltPos + 1;
+  static fromMapKeys(keys: string): KeySequence {
+    const fromMapKeysRecursive = (
+      remaining: string, mappedKeys: Key[],
+    ): Key[] => {
+      if (remaining.length === 0) {
+        return mappedKeys;
       }
-    }
 
-    return fromMapKeysRecursive(
-      remainings.slice(nextPos),
-      mappedKeys.concat([Key.fromMapKey(remainings.slice(0, nextPos))])
-    );
-  };
+      let nextPos = 1;
+      if (remaining.startsWith('<')) {
+        let ltPos = remaining.indexOf('>');
+        if (ltPos > 0) {
+          nextPos = ltPos + 1;
+        }
+      }
 
-  let data = fromMapKeysRecursive(keys, []);
-  return KeySequence.from(data);
-};
+      return fromMapKeysRecursive(
+        remaining.slice(nextPos),
+        mappedKeys.concat([Key.fromMapKey(remaining.slice(0, nextPos))])
+      );
+    };
 
+    let data = fromMapKeysRecursive(keys, []);
+    return new KeySequence(data);
+  }
+}
diff --git a/src/content/repositories/KeymapRepository.ts b/src/content/repositories/KeymapRepository.ts
index d7b5b7d..4463678 100644
--- a/src/content/repositories/KeymapRepository.ts
+++ b/src/content/repositories/KeymapRepository.ts
@@ -7,7 +7,7 @@ export default interface KeymapRepository {
   clear(): void;
 }
 
-let current: KeySequence = KeySequence.from([]);
+let current: KeySequence = new KeySequence([]);
 
 export class KeymapRepositoryImpl {
 
@@ -17,6 +17,6 @@ export class KeymapRepositoryImpl {
   }
 
   clear(): void {
-    current = KeySequence.from([]);
+    current = new KeySequence([]);
   }
 }
diff --git a/src/content/usecases/KeymapUseCase.ts b/src/content/usecases/KeymapUseCase.ts
index d0d039a..0f654c8 100644
--- a/src/content/usecases/KeymapUseCase.ts
+++ b/src/content/usecases/KeymapUseCase.ts
@@ -5,7 +5,7 @@ import AddonEnabledRepository from '../repositories/AddonEnabledRepository';
 import * as operations from '../../shared/operations';
 import { Keymaps } from '../../shared/Settings';
 import Key from '../domains/Key';
-import KeySequence, * as keySequenceUtils from '../domains/KeySequence';
+import KeySequence from '../domains/KeySequence';
 
 type KeymapEntityMap = Map<KeySequence, operations.Operation>;
 
@@ -71,7 +71,7 @@ export default class KeymapUseCase {
     };
     let entries = Object.entries(keymaps).map((entry) => {
       return [
-        keySequenceUtils.fromMapKeys(entry[0]),
+        KeySequence.fromMapKeys(entry[0]),
         entry[1],
       ];
     }) as [KeySequence, operations.Operation][];
diff --git a/test/content/domains/KeySequence.test.ts b/test/content/domains/KeySequence.test.ts
index 9afc360..62af165 100644
--- a/test/content/domains/KeySequence.test.ts
+++ b/test/content/domains/KeySequence.test.ts
@@ -1,49 +1,48 @@
-import KeySequence, * as utils from '../../../src/content/domains/KeySequence';
+import KeySequence from '../../../src/content/domains/KeySequence';
 import Key from '../../../src/content/domains/Key';
 import { expect } from 'chai'
 
 describe("KeySequence", () => {
   describe('#push', () => {
     it('append a key to the sequence', () => {
-      let seq = KeySequence.from([]);
+      let seq = new KeySequence([]);
       seq.push(Key.fromMapKey('g'));
       seq.push(Key.fromMapKey('<S-U>'));
 
-      let array = seq.getKeyArray();
-      expect(array[0].key).to.equal('g');
-      expect(array[1].key).to.equal('U');
-      expect(array[1].shift).to.be.true;
+      expect(seq.keys[0].key).to.equal('g');
+      expect(seq.keys[1].key).to.equal('U');
+      expect(seq.keys[1].shift).to.be.true;
     })
   });
 
   describe('#startsWith', () => {
     it('returns true if the key sequence starts with param', () => {
-      let seq = KeySequence.from([
+      let seq = new KeySequence([
         Key.fromMapKey('g'),
         Key.fromMapKey('<S-U>'),
       ]);
 
-      expect(seq.startsWith(KeySequence.from([
+      expect(seq.startsWith(new KeySequence([
       ]))).to.be.true;
-      expect(seq.startsWith(KeySequence.from([
+      expect(seq.startsWith(new KeySequence([
         Key.fromMapKey('g'),
       ]))).to.be.true;
-      expect(seq.startsWith(KeySequence.from([
+      expect(seq.startsWith(new KeySequence([
         Key.fromMapKey('g'), Key.fromMapKey('<S-U>'),
       ]))).to.be.true;
-      expect(seq.startsWith(KeySequence.from([
+      expect(seq.startsWith(new KeySequence([
         Key.fromMapKey('g'), Key.fromMapKey('<S-U>'), Key.fromMapKey('x'),
       ]))).to.be.false;
-      expect(seq.startsWith(KeySequence.from([
+      expect(seq.startsWith(new KeySequence([
         Key.fromMapKey('h'),
       ]))).to.be.false;
     });
 
     it('returns true if the empty sequence starts with an empty sequence', () => {
-      let seq = KeySequence.from([]);
+      let seq = new KeySequence([]);
 
-      expect(seq.startsWith(KeySequence.from([]))).to.be.true;
-      expect(seq.startsWith(KeySequence.from([
+      expect(seq.startsWith(new KeySequence([]))).to.be.true;
+      expect(seq.startsWith(new KeySequence([
         Key.fromMapKey('h'),
       ]))).to.be.false;
     })
@@ -51,23 +50,23 @@ describe("KeySequence", () => {
 
   describe('#fromMapKeys', () => {
     it('returns mapped keys for Shift+Esc', () => {
-      let keyArray = utils.fromMapKeys('<S-Esc>').getKeyArray();
-      expect(keyArray).to.have.lengthOf(1);
-      expect(keyArray[0].key).to.equal('Esc');
-      expect(keyArray[0].shift).to.be.true;
+      let keys = KeySequence.fromMapKeys('<S-Esc>').keys;
+      expect(keys).to.have.lengthOf(1);
+      expect(keys[0].key).to.equal('Esc');
+      expect(keys[0].shift).to.be.true;
     });
 
     it('returns mapped keys for a<C-B><A-C>d<M-e>', () => {
-      let keyArray = utils.fromMapKeys('a<C-B><A-C>d<M-e>').getKeyArray();
-      expect(keyArray).to.have.lengthOf(5);
-      expect(keyArray[0].key).to.equal('a');
-      expect(keyArray[1].ctrl).to.be.true;
-      expect(keyArray[1].key).to.equal('b');
-      expect(keyArray[2].alt).to.be.true;
-      expect(keyArray[2].key).to.equal('c');
-      expect(keyArray[3].key).to.equal('d');
-      expect(keyArray[4].meta).to.be.true;
-      expect(keyArray[4].key).to.equal('e');
+      let keys = KeySequence.fromMapKeys('a<C-B><A-C>d<M-e>').keys;
+      expect(keys).to.have.lengthOf(5);
+      expect(keys[0].key).to.equal('a');
+      expect(keys[1].ctrl).to.be.true;
+      expect(keys[1].key).to.equal('b');
+      expect(keys[2].alt).to.be.true;
+      expect(keys[2].key).to.equal('c');
+      expect(keys[3].key).to.equal('d');
+      expect(keys[4].meta).to.be.true;
+      expect(keys[4].key).to.equal('e');
     });
   })
 });
diff --git a/test/content/repositories/KeymapRepository.test.ts b/test/content/repositories/KeymapRepository.test.ts
index 8f0be67..da5624e 100644
--- a/test/content/repositories/KeymapRepository.test.ts
+++ b/test/content/repositories/KeymapRepository.test.ts
@@ -16,7 +16,7 @@ describe('KeymapRepositoryImpl', () => {
       sut.enqueueKey(Key.fromMapKey('b');
       let sequence = sut.enqueueKey(Key.fromMapKey('c'));
 
-      let keys = sequence.getKeyArray();
+      let keys = sequence.keys;
       expect(keys[0].equals(Key.fromMapKey('a'))).to.be.true;
       expect(keys[1].equals(Key.fromMapKey('b'))).to.be.true;
       expect(keys[2].equals(Key.fromMapKey('c'))).to.be.true;
@@ -25,9 +25,9 @@ describe('KeymapRepositoryImpl', () => {
 
   describe('#clear()', () => {
     it('clears keys', () => {
-      sut.enqueueKey(Key.fromMapKey('a');
-      sut.enqueueKey(Key.fromMapKey('b');
-      sut.enqueueKey(Key.fromMapKey('c');
+      sut.enqueueKey(Key.fromMapKey('a'));
+      sut.enqueueKey(Key.fromMapKey('b'));
+      sut.enqueueKey(Key.fromMapKey('c'));
       sut.clear();
 
       let sequence = sut.enqueueKey(Key.fromMapKey('a'));