Homework 1. Basic project template and console calculator

.eslintrc.json

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+{
+    "extends": [
+        "eslint:recommended",
+        "plugin:@typescript-eslint/recommended",
+        "prettier",
+        "plugin:prettier/recommended"
+    ],
+    "parser": "@typescript-eslint/parser",
+    "parserOptions": {
+        "ecmaVersion": 12,
+        "sourceType": "module"
+    },
+    "plugins": [
+        "@typescript-eslint",
+        "prettier"
+    ],
+    "rules": {
+        "no-constant-condition": "off",
+        "prettier/prettier": [
+            "error",
+            {
+                "endOfLine": "auto"
+            }
+        ]
+    }
+}

.gitignore

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+node_modules/
+dist/
+coverage/

.prettierignore

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+dist
+coverage

.prettierrc

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+{
+  "printWidth": 140,
+  "tabWidth": 4,
+  "semi": true,
+  "trailingComma": "none",
+  "singleQuote": false,
+  "quoteProps": "preserve"
+}

.vscode/launch.json

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+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Jest single run all tests",
+      "program": "${workspaceRoot}/node_modules/jest/bin/jest.js",
+      "args": [
+        "--verbose",
+        "-i",
+        "--no-cache"
+      ],
+      "console": "integratedTerminal",
+      "internalConsoleOptions": "neverOpen"
+    },
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Jest watch all tests",
+      "program": "${workspaceRoot}/node_modules/jest/bin/jest.js",
+      "args": [
+        "--verbose",
+        "-i",
+        "--no-cache",
+        "--watchAll"
+      ],
+      "console": "integratedTerminal",
+      "internalConsoleOptions": "neverOpen"
+    },
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Jest watch current file",
+      "program": "${workspaceFolder}/node_modules/jest/bin/jest",
+      "args": [
+        "${fileBasename}",
+        "--verbose",
+        "-i",
+        "--no-cache",
+        "--watchAll"
+      ],
+      "console": "integratedTerminal",
+      "internalConsoleOptions": "neverOpen"
+    }
+  ]
+}

README.md

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 # otus-reactjs
 Homework for https://otus.ru/lessons/react/
+
+## Console calculator
+
+Run calculator in REPL mode with
+
+`npm start`
+
+Supported operations: 
+
+Operation | Format
+--- | ---
+sum | `x + y`
+substract | `x - y`
+multiply | `x * y`
+divide | `x / y`
+| | |
+remainder | `x % y`
+power | `x ^ y`
+square | `x **`
+factorial | `x !`
+| | |
+sinus | `sin x`
+cosinus | `cos x`
+tangens | `tg x`
+cotangens | `ctg x`
+fibonacci | `fib x`
+
+Pad numbers and operators with spaces, e.g. `1 + 2 + 3`.  
+
+Use parentheses `( )` to group operations, e.g. `5 * (3 ** - (2 + 1))` = 30
+
+Trigonometric operations use radians, so `PI` is supported, e.g. `sin(PI / 2)` = 1.
+
+Type `bye` or `quit` or `exit` to stop REPL.
+
+## Tests
+
+`npm test` will run tests
+
+`npm run coverage` will run tests and generate coverage report 

babel.config.json

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+{
+    "presets": [
+        ["@babel/env", { 
+                "targets": {"node": "current"}
+            }
+        ],
+        ["@babel/preset-typescript"]
+    ]
+}

jest.config.js

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+module.exports = {
+    clearMocks: true,
+    coverageDirectory: "coverage",
+    testEnvironment: "node",
+    transform: {
+        "^.+\\.(js|ts)x?$": "<rootDir>/node_modules/babel-jest"
+    }
+};