diff --git a/.gitignore b/.gitignore
index a1066ba..19b4ef7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -249,7 +249,6 @@ typings/
 
 # Nuxt.js build / generate output
 .nuxt
-dist
 
 # Gatsby files
 .cache/
diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..b58b603
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,5 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
new file mode 100644
index 0000000..03d9549
--- /dev/null
+++ b/.idea/inspectionProfiles/Project_Default.xml
@@ -0,0 +1,6 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="Eslint" enabled="true" level="WARNING" enabled_by_default="true" />
+  </profile>
+</component>
\ No newline at end of file
diff --git a/.idea/javascript-calculator.iml b/.idea/javascript-calculator.iml
new file mode 100644
index 0000000..0c8867d
--- /dev/null
+++ b/.idea/javascript-calculator.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/temp" />
+      <excludeFolder url="file://$MODULE_DIR$/.tmp" />
+      <excludeFolder url="file://$MODULE_DIR$/tmp" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..ba07bc0
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/javascript-calculator.iml" filepath="$PROJECT_DIR$/.idea/javascript-calculator.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/cypress.json b/cypress.json
new file mode 100644
index 0000000..3d8d2be
--- /dev/null
+++ b/cypress.json
@@ -0,0 +1,7 @@
+{
+  "baseUrl": "http://localhost:5050",
+  "env": {
+    "TOTAL": "#total",
+    "MODIFIER": ".modifier"
+  }
+}
diff --git a/cypress/fixtures/example.json b/cypress/fixtures/example.json
new file mode 100644
index 0000000..02e4254
--- /dev/null
+++ b/cypress/fixtures/example.json
@@ -0,0 +1,5 @@
+{
+  "name": "Using fixtures to represent data",
+  "email": "hello@cypress.io",
+  "body": "Fixtures are a great way to mock data for responses to routes"
+}
diff --git a/cypress/integration/sample_spec.ts b/cypress/integration/sample_spec.ts
new file mode 100644
index 0000000..8c12617
--- /dev/null
+++ b/cypress/integration/sample_spec.ts
@@ -0,0 +1,43 @@
+describe("Reg form", () => {
+  const clickButtons = (values: string): void => {
+    const charFromValues = values.split("");
+    charFromValues.forEach((char) => {
+      cy.get("button").contains(char).click();
+    })
+  };
+
+  const calculate = (expression: string, expectedResult: string): void => {
+    clickButtons(expression);
+    cy.get(Cypress.env("TOTAL")).should('have.text', expectedResult);
+    cy.get(Cypress.env("MODIFIER")).click();
+  }
+  it("input numbers must be in range 0 ~ 999", () => {
+    cy.visit("/");
+    clickButtons("123111");
+    cy.get(Cypress.env("TOTAL")).should("have.text", "123");
+  })
+  it("clear board", () => {
+    cy.get(Cypress.env("MODIFIER")).click();
+    cy.get(Cypress.env("TOTAL")).should("have.text", "0");
+  })
+  it("add numbers", () => {
+    calculate("123+123=","246");
+    calculate("123+123+","246");
+    calculate("123+123+123=","369");
+  })
+  it("multiply numbers", () => {
+    calculate("123X123=","15129");
+    calculate("123X123X","15129");
+    calculate("123X123X123=","1860867");
+  })
+  it("divide numbers", () => {
+    calculate("123/123=","1");
+    calculate("123/123/","1");
+    calculate("123/123/123=","0");
+  })
+  it("subtract numbers", () => {
+    calculate("123-123=","0");
+    calculate("123-123-","0");
+    calculate("123-123-123=","-123");
+  })
+})
\ No newline at end of file
diff --git a/cypress/plugins/index.js b/cypress/plugins/index.js
new file mode 100644
index 0000000..63fa4f5
--- /dev/null
+++ b/cypress/plugins/index.js
@@ -0,0 +1,22 @@
+/// <reference types="cypress" />
+// ***********************************************************
+// This example plugins/index.tsfile can be used to load plugins
+//
+// You can change the location of this file or turn off loading
+// the plugins file with the 'pluginsFile' configuration option.
+//
+// You can read more here:
+// https://on.cypress.io/plugins-guide
+// ***********************************************************
+
+// This function is called when a project is opened or re-opened (e.g. due to
+// the project's config changing)
+
+/**
+ * @type {Cypress.PluginConfig}
+ */
+// eslint-disable-next-line no-unused-vars
+module.exports = (on, config) => {
+  // `on` is used to hook into various events Cypress emits
+  // `config` is the resolved Cypress config
+}
diff --git a/cypress/support/commands.js b/cypress/support/commands.js
new file mode 100644
index 0000000..3d8b9b6
--- /dev/null
+++ b/cypress/support/commands.js
@@ -0,0 +1,25 @@
+// ***********************************************
+// This example commands.tsfile shows you how to
+// create various custom commands and overwrite
+// existing commands.
+//
+// For more comprehensive examples of custom
+// commands please read more here:
+// https://on.cypress.io/custom-commands
+// ***********************************************
+//
+//
+// -- This is a parent command --
+// Cypress.Commands.add('login', (email, password) => { ... })
+//
+//
+// -- This is a child command --
+// Cypress.Commands.add('drag', { prevSubject: 'element'}, (subject, options) => { ... })
+//
+//
+// -- This is a dual command --
+// Cypress.Commands.add('dismiss', { prevSubject: 'optional'}, (subject, options) => { ... })
+//
+//
+// -- This will overwrite an existing command --
+// Cypress.Commands.overwrite('visit', (originalFn, url, options) => { ... })
diff --git a/cypress/support/index.js b/cypress/support/index.js
new file mode 100644
index 0000000..265454b
--- /dev/null
+++ b/cypress/support/index.js
@@ -0,0 +1,20 @@
+// ***********************************************************
+// This example support/index.tsfile is processed and
+// loaded automatically before your test files.
+//
+// This is a great place to put global configuration and
+// behavior that modifies Cypress.
+//
+// You can change the location of this file or turn off
+// automatically serving support files with the
+// 'supportFile' configuration option.
+//
+// You can read more here:
+// https://on.cypress.io/configuration
+// ***********************************************************
+
+// Import commands.tsfile using ES2015 syntax:
+import './commands'
+
+// Alternatively you can use CommonJS syntax:
+// require('./commands')
diff --git a/cypress/videos/sample_spec.ts.mp4 b/cypress/videos/sample_spec.ts.mp4
new file mode 100644
index 0000000..3678cf5
Binary files /dev/null and b/cypress/videos/sample_spec.ts.mp4 differ
diff --git a/dist/index.js b/dist/index.js
new file mode 100644
index 0000000..aa62084
--- /dev/null
+++ b/dist/index.js
@@ -0,0 +1,2 @@
+import Calculator from "./tsfile/component/calculator.js";
+new Calculator(document.querySelector('.calculator'));
diff --git a/dist/tsfile/component/board.js b/dist/tsfile/component/board.js
new file mode 100644
index 0000000..290cecf
--- /dev/null
+++ b/dist/tsfile/component/board.js
@@ -0,0 +1,23 @@
+import { isClear, isOperator } from "../../utils/utils.js";
+class BoardImpl {
+    constructor({ $element, onClick }) {
+        this.addEvent = () => {
+            this.$element.addEventListener('click', ({ target }) => {
+                if (!(target instanceof HTMLButtonElement))
+                    return;
+                const value = target.textContent;
+                if (isOperator(value)) {
+                    return this.onClick({ type: 'Operator', value });
+                }
+                if (isClear(value)) {
+                    return this.onClick({ type: 'Clear', value });
+                }
+                return this.onClick({ type: 'Number', value });
+            });
+        };
+        this.$element = $element;
+        this.onClick = onClick;
+        this.addEvent();
+    }
+}
+export default BoardImpl;
diff --git a/dist/tsfile/component/calculator.js b/dist/tsfile/component/calculator.js
new file mode 100644
index 0000000..5a04f8c
--- /dev/null
+++ b/dist/tsfile/component/calculator.js
@@ -0,0 +1,65 @@
+import ScreenImpl from "./screen.js";
+import BoardImpl from "./board.js";
+import { calc } from "../../utils/utils.js";
+class Calculator {
+    constructor($element) {
+        this.$element = $element;
+        this.clear = () => {
+            this.value = '';
+            this.oper = '';
+            this.prev = '';
+        };
+        this.setState = (value) => {
+            this.value = value;
+            this.screen.setState(value);
+        };
+        this.onClick = ({ type, value }) => {
+            switch (type) {
+                case 'Operator':
+                    if (this.operatorPressed)
+                        return;
+                    this.operatorPressed = true;
+                    this.prev = calc(this.prev, this.oper, this.value);
+                    this.oper = value;
+                    this.screen.setState(this.prev);
+                    if (value === '=') {
+                        this.operatorPressed = false;
+                    }
+                    this.value = '0';
+                    break;
+                case 'Clear':
+                    this.clear();
+                    this.setState('0');
+                    break;
+                case 'Number':
+                    if (this.oper === '=')
+                        this.clear();
+                    if (this.value.length === 3)
+                        break;
+                    let newValue = this.value === '0' ? value : this.value + value;
+                    if (!this.operatorPressed) {
+                        this.setState(newValue);
+                        break;
+                    }
+                    this.operatorPressed = false;
+                    this.setState(value);
+                    break;
+                default:
+                    throw new Error('Operation fail');
+            }
+        };
+        this.value = '0';
+        this.prev = '';
+        this.oper = '';
+        this.operatorPressed = false;
+        this.screen = new ScreenImpl({
+            $element: this.$element.querySelector('#total'),
+            value: this.value
+        });
+        new BoardImpl({
+            $element: this.$element,
+            onClick: this.onClick
+        });
+    }
+}
+export default Calculator;
diff --git a/dist/tsfile/component/screen.js b/dist/tsfile/component/screen.js
new file mode 100644
index 0000000..5719282
--- /dev/null
+++ b/dist/tsfile/component/screen.js
@@ -0,0 +1,14 @@
+class ScreenImpl {
+    constructor({ $element, value }) {
+        this.setState = (value) => {
+            this.value = value;
+            this.render();
+        };
+        this.render = () => {
+            this.$element.textContent = `${this.value}`;
+        };
+        this.$element = $element;
+        this.value = value;
+    }
+}
+export default ScreenImpl;
diff --git a/dist/types/types.js b/dist/types/types.js
new file mode 100644
index 0000000..cb0ff5c
--- /dev/null
+++ b/dist/types/types.js
@@ -0,0 +1 @@
+export {};
diff --git a/dist/utils/utils.js b/dist/utils/utils.js
new file mode 100644
index 0000000..29de25b
--- /dev/null
+++ b/dist/utils/utils.js
@@ -0,0 +1,30 @@
+const isOperator = (value) => {
+    const allowedKey = ['+', '-', '/', 'X', '='];
+    return allowedKey.indexOf(value) !== -1;
+};
+const isClear = (value) => {
+    const allowedKey = 'AC';
+    return allowedKey === value;
+};
+const operate = (prev, oper, value) => {
+    const num_prev = +prev;
+    const num_value = +value;
+    switch (oper) {
+        case '+':
+            return String(num_prev + num_value);
+        case '-':
+            return String(num_prev - num_value);
+        case 'X':
+            return String(num_prev * num_value);
+        case '/':
+            return String(Math.floor(num_prev / num_value));
+        default:
+            return prev;
+    }
+};
+const calc = (prev, oper, value) => {
+    if (prev === '' || oper === '')
+        return value;
+    return operate(prev, oper, value);
+};
+export { isOperator, isClear, calc };
diff --git a/index.html b/index.html
index 8bf48ab..58e3603 100644
--- a/index.html
+++ b/index.html
@@ -1,38 +1,39 @@
 <!DOCTYPE html>
 <html lang="en">
-    <head>
-        <meta charset="UTF-8" />
-        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-        <title>Calculator</title>
-        <link rel="stylesheet" type="text/css" href="src/css/index.css" />
-    </head>
-    <body>
-        <div id="app">
-            <div class="calculator">
-                <h1 id="total">0</h1>
-                <div class="digits flex">
-                    <button class="digit">9</button>
-                    <button class="digit">8</button>
-                    <button class="digit">7</button>
-                    <button class="digit">6</button>
-                    <button class="digit">5</button>
-                    <button class="digit">4</button>
-                    <button class="digit">3</button>
-                    <button class="digit">2</button>
-                    <button class="digit">1</button>
-                    <button class="digit">0</button>
-                </div>
-                <div class="modifiers subgrid">
-                    <button class="modifier">AC</button>
-                </div>
-                <div class="operations subgrid">
-                    <button class="operation">/</button>
-                    <button class="operation">X</button>
-                    <button class="operation">-</button>
-                    <button class="operation">+</button>
-                    <button class="operation">=</button>
-                </div>
-            </div>
+<head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Calculator</title>
+    <link rel="stylesheet" type="text/css" href="src/css/index.css" />
+</head>
+<body>
+<div id="app">
+    <div class="calculator">
+        <h1 id="total">0</h1>
+        <div class="digits flex">
+            <button class="digit">9</button>
+            <button class="digit">8</button>
+            <button class="digit">7</button>
+            <button class="digit">6</button>
+            <button class="digit">5</button>
+            <button class="digit">4</button>
+            <button class="digit">3</button>
+            <button class="digit">2</button>
+            <button class="digit">1</button>
+            <button class="digit">0</button>
         </div>
-    </body>
-</html>
+        <div class="modifiers subgrid">
+            <button class="modifier">AC</button>
+        </div>
+        <div class="operations subgrid">
+            <button class="operation">/</button>
+            <button class="operation">X</button>
+            <button class="operation">-</button>
+            <button class="operation">+</button>
+            <button class="operation">=</button>
+        </div>
+    </div>
+</div>
+<script type="module" src="./dist/index.js"></script>
+</body>
+</html>
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..8c87d77
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2035 @@
+{
+  "name": "learning",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.12.11",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.12.11.tgz",
+      "integrity": "sha512-Zt1yodBx1UcyiePMSkWnU4hPqhwq7hGi2nFL1LeA3EUl+q2LQx16MISgJ0+z7dnmgvP9QtIleuETGOiOH1RcIw==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.10.4"
+      }
+    },
+    "@babel/helper-validator-identifier": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.5.tgz",
+      "integrity": "sha512-5lsetuxCLilmVGyiLEfoHBRX8UCFD+1m2x3Rj97WrW3V7H3u4RWRXA4evMjImCsin2J2YT0QaVDGf+z8ondbAg==",
+      "dev": true
+    },
+    "@babel/highlight": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.14.5.tgz",
+      "integrity": "sha512-qf9u2WFWVV0MppaL877j2dBtQIDgmidgjGk5VIMw3OadXvYaXn66U1BFlH2t4+t3i+8PhedppRv+i40ABzd+gg==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-validator-identifier": "^7.14.5",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+          "dev": true,
+          "requires": {
+            "color-convert": "^1.9.0"
+          }
+        },
+        "chalk": {
+          "version": "2.4.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
+          }
+        },
+        "color-convert": {
+          "version": "1.9.3",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
+          "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
+          "dev": true,
+          "requires": {
+            "color-name": "1.1.3"
+          }
+        },
+        "color-name": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+          "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
+          "dev": true
+        },
+        "has-flag": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+          "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
+          "dev": true
+        },
+        "supports-color": {
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
+        }
+      }
+    },
+    "@cypress/request": {
+      "version": "2.88.5",
+      "resolved": "https://registry.npmjs.org/@cypress/request/-/request-2.88.5.tgz",
+      "integrity": "sha512-TzEC1XMi1hJkywWpRfD2clreTa/Z+lOrXDCxxBTBPEcY5azdPi56A6Xw+O4tWJnaJH3iIE7G5aDXZC6JgRZLcA==",
+      "dev": true,
+      "requires": {
+        "aws-sign2": "~0.7.0",
+        "aws4": "^1.8.0",
+        "caseless": "~0.12.0",
+        "combined-stream": "~1.0.6",
+        "extend": "~3.0.2",
+        "forever-agent": "~0.6.1",
+        "form-data": "~2.3.2",
+        "har-validator": "~5.1.3",
+        "http-signature": "~1.2.0",
+        "is-typedarray": "~1.0.0",
+        "isstream": "~0.1.2",
+        "json-stringify-safe": "~5.0.1",
+        "mime-types": "~2.1.19",
+        "oauth-sign": "~0.9.0",
+        "performance-now": "^2.1.0",
+        "qs": "~6.5.2",
+        "safe-buffer": "^5.1.2",
+        "tough-cookie": "~2.5.0",
+        "tunnel-agent": "^0.6.0",
+        "uuid": "^3.3.2"
+      }
+    },
+    "@cypress/xvfb": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@cypress/xvfb/-/xvfb-1.2.4.tgz",
+      "integrity": "sha512-skbBzPggOVYCbnGgV+0dmBdW/s77ZkAOXIC1knS8NagwDjBrNC1LuXtQJeiN6l+m7lzmHtaoUw/ctJKdqkG57Q==",
+      "dev": true,
+      "requires": {
+        "debug": "^3.1.0",
+        "lodash.once": "^4.1.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "3.2.7",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
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+      "dev": true,
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+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..f90019d
--- /dev/null
+++ b/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "learning",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "cypress:open": "cypress open",
+    "cypress:run": "cypress run"
+  },
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@types/node": "^15.12.4",
+    "cypress": "^7.6.0",
+    "eslint": "^7.29.0",
+    "typescript": "^4.3.4"
+  }
+}
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..e44ca2a
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,3 @@
+import Calculator from "./tsfile/component/calculator.js";
+
+new Calculator(document.querySelector('.calculator')!);
\ No newline at end of file
diff --git a/src/js/index.js b/src/js/index.js
deleted file mode 100644
index e69de29..0000000
diff --git a/src/tsfile/component/board.ts b/src/tsfile/component/board.ts
new file mode 100644
index 0000000..a02b43b
--- /dev/null
+++ b/src/tsfile/component/board.ts
@@ -0,0 +1,29 @@
+import {BoardProps} from "../../types/types.js";
+import {isClear, isOperator} from "../../utils/utils.js";
+
+class BoardImpl {
+  private readonly $element: HTMLDivElement;
+  private readonly onClick: ({type, value}: { type: string, value: string }) => void;
+
+  constructor({$element, onClick}: BoardProps) {
+    this.$element = $element;
+    this.onClick = onClick;
+    this.addEvent();
+  }
+
+  addEvent = () => {
+    this.$element.addEventListener('click', ({target}) => {
+      if (!(target instanceof HTMLButtonElement)) return;
+      const value = target.textContent!;
+      if (isOperator(value)) {
+        return this.onClick({type: 'Operator', value});
+      }
+      if (isClear(value)) {
+        return this.onClick({type: 'Clear', value});
+      }
+      return this.onClick({type: 'Number', value});
+    })
+  }
+}
+
+export default BoardImpl;
\ No newline at end of file
diff --git a/src/tsfile/component/calculator.ts b/src/tsfile/component/calculator.ts
new file mode 100644
index 0000000..c266d61
--- /dev/null
+++ b/src/tsfile/component/calculator.ts
@@ -0,0 +1,73 @@
+import ScreenImpl from "./screen.js";
+import {Screen, Operator} from "../../types/types.js";
+import BoardImpl from "./board.js";
+import {calc} from "../../utils/utils.js";
+
+class Calculator {
+  private value: string;
+  private prev: string;
+  private operatorPressed: boolean;
+  private oper: Operator;
+  private screen: Screen;
+
+  constructor(private $element: HTMLDivElement) {
+    this.value = '0';
+    this.prev = '';
+    this.oper = '';
+    this.operatorPressed = false;
+    this.screen = new ScreenImpl({
+      $element: this.$element.querySelector('#total')!
+      , value: this.value
+    });
+    new BoardImpl({
+      $element: this.$element,
+      onClick: this.onClick
+    });
+  }
+
+  clear = () => {
+    this.value = '';
+    this.oper = '';
+    this.prev = '';
+  }
+
+  setState = (value: string) => {
+    this.value = value;
+    this.screen.setState(value);
+  }
+
+  onClick = ({type, value}: { type: string, value: string }) => {
+    switch (type) {
+      case 'Operator':
+        if (this.operatorPressed) return;
+        this.operatorPressed = true;
+        this.prev = calc(this.prev, this.oper, this.value);
+        this.oper = value! as Operator;
+        this.screen.setState(this.prev);
+        if (value === '=') {
+          this.operatorPressed = false;
+        }
+        this.value = '0';
+        break
+      case 'Clear':
+        this.clear();
+        this.setState('0');
+        break
+      case 'Number':
+        if (this.oper === '=') this.clear();
+        if (this.value.length === 3) break;
+        let newValue = this.value === '0' ? value : this.value+value;
+        if (!this.operatorPressed) {
+          this.setState(newValue);
+          break;
+        }
+        this.operatorPressed = false;
+        this.setState(value);
+        break
+      default:
+        throw new Error('Operation fail');
+    }
+  }
+}
+
+export default Calculator;
\ No newline at end of file
diff --git a/src/tsfile/component/screen.ts b/src/tsfile/component/screen.ts
new file mode 100644
index 0000000..5adb494
--- /dev/null
+++ b/src/tsfile/component/screen.ts
@@ -0,0 +1,21 @@
+import {Screen, ScreenProps} from "../../types/types.js";
+
+class ScreenImpl implements Screen {
+  private readonly $element: HTMLHeadElement;
+  private value: string;
+
+  constructor({$element, value}: ScreenProps) {
+    this.$element = $element;
+    this.value = value;
+  }
+
+  setState = (value: string) => {
+    this.value = value;
+    this.render();
+  }
+  render = () => {
+    this.$element.textContent = `${this.value}`;
+  }
+}
+
+export default ScreenImpl;
\ No newline at end of file
diff --git a/src/types/types.ts b/src/types/types.ts
new file mode 100644
index 0000000..b1af396
--- /dev/null
+++ b/src/types/types.ts
@@ -0,0 +1,24 @@
+type ScreenProps = {
+  $element: HTMLHeadElement,
+  value: string
+};
+
+type Digit = '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9';
+type Operator = '+' | '-' | '/' | 'X' | '=' | '';
+type Clear = 'AC';
+
+interface BoardProps {
+  $element: HTMLDivElement,
+  onClick: ({type, value}: { type: string, value: string }) => void;
+}
+
+interface Screen {
+  setState: (value: string) => void;
+  render: () => void;
+}
+
+interface Board {
+  addEvent: () => void;
+}
+
+export {ScreenProps, Digit, Operator, Clear, BoardProps, Screen, Board};
\ No newline at end of file
diff --git a/src/utils/utils.ts b/src/utils/utils.ts
new file mode 100644
index 0000000..aa02a1a
--- /dev/null
+++ b/src/utils/utils.ts
@@ -0,0 +1,34 @@
+const isOperator = (value: string): boolean => {
+  const allowedKey: string[] = ['+', '-', '/', 'X', '='];
+  return allowedKey.indexOf(value) !== -1;
+}
+
+const isClear = (value: string): boolean => {
+  const allowedKey: string = 'AC';
+  return allowedKey === value;
+}
+
+const operate = (prev: string, oper: string, value: string): string => {
+  const num_prev = +prev;
+  const num_value = +value;
+
+  switch (oper) {
+    case '+':
+      return String(num_prev+num_value);
+    case '-':
+      return String(num_prev-num_value);
+    case 'X':
+      return String(num_prev*num_value);
+    case '/':
+      return String(Math.floor(num_prev/num_value));
+    default:
+      return prev;
+  }
+}
+
+const calc = (prev: string, oper: string, value: string): string => {
+  if (prev === '' || oper === '') return value;
+  return operate(prev, oper, value);
+}
+
+export { isOperator, isClear, calc };
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..736bab3
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,73 @@
+{
+  "compilerOptions": {
+    /* Visit https://aka.ms/tsconfig.json to read more about this file */
+
+    /* Basic Options */
+    // "incremental": true,                         /* Enable incremental compilation */
+    "target": "es6",                                /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
+    "module": "ES2015",                           /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
+    // "lib": [],                                   /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                             /* Allow javascript files to be compiled. */
+    // "checkJs": true,                             /* Report errors in .tsfile files. */
+    // "jsx": "preserve",                           /* Specify JSX code generation: 'preserve', 'react-native', 'react', 'react-jsx' or 'react-jsxdev'. */
+    // "declaration": true,                         /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                      /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    // "sourceMap": true,                           /* Generates corresponding '.map' file. */
+    // "outFile": "./",                             /* Concatenate and emit output to single file. */
+     "outDir": "./dist",                              /* Redirect output structure to the directory. */
+     "rootDir": "./src",                             /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                           /* Enable project compilation */
+    // "tsBuildInfoFile": "./",                     /* Specify file to store incremental compilation information */
+     "removeComments": true,                      /* Do not emit comments to output. */
+     "noEmitOnError": true,
+    // "noEmit": true,                              /* Do not emit outputs. */
+    // "importHelpers": true,                       /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,                  /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,                     /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                                 /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                       /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,                    /* Enable strict null checks. */
+    // "strictFunctionTypes": true,                 /* Enable strict checking of function types. */
+    // "strictBindCallApply": true,                 /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    // "strictPropertyInitialization": true,        /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                      /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                        /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+     "noUnusedLocals": true,                      /* Report errors on unused locals. */
+     "noUnusedParameters": true,                  /* Report errors on unused parameters. */
+     "noImplicitReturns": true,                   /* Report error when not all code paths in function return a value. */
+     "noFallthroughCasesInSwitch": true,          /* Report errors for fallthrough cases in switch statement. */
+     "noUncheckedIndexedAccess": true,            /* Include 'undefined' in index signature results */
+     "noPropertyAccessFromIndexSignature": true,  /* Require undeclared properties from index signatures to use element accesses. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",                  /* Specify module resolution strategy: 'node' (Node.tsfile) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                             /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                                 /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                              /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                             /* List of folders to include type definitions from. */
+     "types": ["cypress"],                                 /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,        /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true,                        /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,                    /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,                /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                            /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                               /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,                     /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                       /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,              /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,               /* Enables experimental support for emitting type metadata for decorators. */
+
+    /* Advanced Options */
+    "skipLibCheck": true,                           /* Skip type checking of declaration files. */
+    "forceConsistentCasingInFileNames": true        /* Disallow inconsistently-cased references to the same file. */
+  },
+  "include": ["*/*.ts"]
+}