first look on the basic project structure

Author: vladkampov

.babelrc

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+{
+  "presets": ["env"]
+}

.eslintignore

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+*.*rc
+node_modules/
+test/
+dist/
+conf/
+coverage/

.eslintrc

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+{
+  "extends": [
+    "eslint-config-airbnb"
+  ],
+  "rules": {
+    "import/extensions": ["off"],
+    "import/first": ["error", null],
+    "import/order": "warn",
+    "class-methods-use-this": ["error"],
+    "no-param-reassign": ["error", { "props": false }],
+    "indent": ["warn", 2, {"SwitchCase": 1}],
+    "max-len": ["warn", {
+      "code": 110
+    }],
+    "comma-dangle": ["warn", {
+      "arrays": "always-multiline",
+      "objects": "always-multiline",
+      "imports": "always-multiline",
+      "exports": "always-multiline",
+      "functions": "ignore"
+    }],
+    "no-shadow": "off",
+    "no-case-declarations": "off",
+    "no-restricted-syntax": [
+      "error",
+      {
+        "selector": "ForInStatement",
+        "message": "for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array."
+      },
+      {
+        "selector": "ForOfStatement",
+        "message": "iterators/generators require regenerator-runtime, which is too heavyweight for this guide to allow them. Separately, loops should be avoided in favor of array iterations."
+      },
+      {
+        "selector": "LabeledStatement",
+        "message": "Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand."
+      },
+      {
+        "selector": "WithStatement",
+        "message": "`with` is disallowed in strict mode because it makes code impossible to predict and optimize."
+      }
+    ],
+    "comma-spacing": ["warn", { "before": false, "after": true }],
+    "camelcase": ["warn", { "properties": "never" }],
+    "keyword-spacing": ["warn", {
+      "before": true,
+      "after": true,
+      "overrides": {
+        "return": { "after": true },
+        "throw": { "after": true },
+        "case": { "after": true }
+      }
+    }],
+    "semi": ["warn", "always"],
+    "no-underscore-dangle": ["warn", { "allowAfterThis": false }],
+    "no-unused-vars": ["warn", { "vars": "all", "args": "after-used", "ignoreRestSiblings": true }],
+    "object-curly-spacing": ["warn", "always"],
+    "quote-props": ["warn", "as-needed", { "keywords": false, "unnecessary": true, "numbers": false }],
+    "space-before-function-paren": ["warn", {
+      "anonymous": "always",
+      "named": "never",
+      "asyncArrow": "always"
+    }],
+    "spaced-comment": ["warn", "always", {
+      "line": {
+        "exceptions": ["-", "+"],
+        "markers": ["=", "!"]
+      },
+      "block": {
+        "exceptions": ["-", "+"],
+        "markers": ["=", "!"],
+        "balanced": true
+      }
+    }],
+    "prefer-template": "warn",
+    "prefer-const": ["warn", {
+      "destructuring": "any",
+      "ignoreReadBeforeAssign": true
+    }],
+    "prefer-arrow-callback": ["warn", {
+      "allowNamedFunctions": false,
+      "allowUnboundThis": true
+    }],
+    "arrow-parens": ["warn", "as-needed"],
+    "no-console": ["warn", { "allow": ["warn", "error"] }],
+    "padded-blocks": "off",
+    "eol-last": "warn",
+    "no-trailing-spaces": "warn",
+    "quotes": "warn",
+    "no-multiple-empty-lines": "warn"
+  },
+  "env" : {
+    "jest": true,
+    "node": true
+  },
+  "parser": "babel-eslint",
+  "plugins": ["babel"]
+}

.gitignore

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+*.log
+node_modules/
+dist/
+coverage/

conf/jest.config.js

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+const path = require('path');
+
+module.exports = {
+  rootDir: path.join(process.cwd(), './'),
+  collectCoverage: true,
+  verbose: true,
+};

conf/webpack.config.js

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+const path = require('path');
+const webpack = require('webpack');
+const CleanWebpackPlugin = require('clean-webpack-plugin');
+
+module.exports = {
+  context: path.join(process.cwd(), 'src'), // the home directory for webpack
+
+  devtool: 'source-map', // enhance debugging by adding meta info for the browser devtools
+
+  entry: {
+    app: './index.js',
+  },
+
+  output: {
+    path: path.join(process.cwd(), 'dist'),
+    filename: '[name].[hash].js',
+    publicPath: '/',
+    sourceMapFilename: '[name].map',
+  },
+
+  resolve: {
+    extensions: ['.js'], // extensions that are used
+    modules: [path.join(process.cwd(), 'src'), 'node_modules'], // directories where to look for modules
+  },
+
+  devServer: {
+    // publicPath: '/',
+    // port: 9000,
+    contentBase: path.join(process.cwd(), 'dist'), // static file location
+    // host: 'localhost',
+    // historyApiFallback: true, // true for index.html upon 404, object for multiple paths
+    noInfo: false,
+    stats: 'minimal',
+    hot: true, // hot module replacement. Depends on HotModuleReplacementPlugin
+  },
+
+  module: {
+    rules: [{
+      enforce: 'pre', // to check source files, not modified by other loaders (like babel-loader)
+      test: /\.js$/,
+      exclude: /node_modules/,
+      loader: 'eslint-loader',
+    }, {
+      test: /\.js$/,
+      exclude: /node_modules/,
+      use: {
+        loader: 'babel-loader',
+        options: {
+          presets: ['env'],
+        },
+      },
+    }],
+  },
+  plugins: [
+    new webpack.HotModuleReplacementPlugin(),
+    new CleanWebpackPlugin(['dist'], { root: process.cwd() }),
+    new webpack.optimize.CommonsChunkPlugin({
+      name: 'vendor',
+    }),
+  ],
+};

externalTestsRepo/lesson0.test.js

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+import lessonn0 from '../src/lesson0';
+
+describe('sum function', () => {
+  test('sum', () => {
+    expect(lessonn0.task0.sum(1, 2)).toBe(3);
+  });
+  test('sum', () => {
+    expect(() => lessonn0.task0.sum(1, {})).toThrow();
+  });
+  test('sum', () => {
+    expect(lessonn0.task0.sum(1, 'lalka')).toBe('1lalka');
+  });
+  test('sum', () => {
+    expect(lessonn0.task0.sum('lalka', 'lalka')).toBe('lalkalalka');
+  });
+  test('sum', () => {
+    expect(() => lessonn0.task0.sum({}, {})).toThrow();
+  });
+  test('sum', () => {
+    expect(lessonn0.task0.sum('lalka', 1)).toBe('lalka1');
+  });
+  test('sum', () => {
+    expect(() => lessonn0.task0.sum([], {})).toThrow();
+  });
+  test('sum', () => {
+    expect(lessonn0.task0.sum(1)).toBe(1);
+  });
+});

package.json

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+{
+  "name": "gl-procamp-base",
+  "version": "1.0.0",
+  "description": "Base project for studying in GL Pro Canp academy",
+  "main": "src/index.js",
+  "author": "Vladyslav Kampov",
+  "license": "MIT",
+  "devDependencies": {
+    "babel-core": "^6.26.0",
+    "babel-eslint": "^8.0.3",
+    "babel-jest": "^22.0.3",
+    "babel-loader": "^7.1.2",
+    "babel-preset-env": "^1.6.1",
+    "clean-webpack-plugin": "^0.1.17",
+    "eslint": "^4.13.1",
+    "eslint-config-airbnb": "^16.1.0",
+    "eslint-loader": "^1.9.0",
+    "eslint-plugin-babel": "^4.1.2",
+    "eslint-plugin-import": "^2.8.0",
+    "eslint-plugin-jsx-a11y": "^6.0.3",
+    "eslint-plugin-react": "^7.5.1",
+    "jest": "^22.0.3",
+    "path": "^0.12.7",
+    "webpack": "^3.10.0",
+    "webpack-dev-server": "^2.9.7"
+  },
+  "scripts": {
+    "start": "webpack-dev-server --config conf/webpack.config.js",
+    "build": "webpack --config conf/webpack.config.js --progress --profile",
+    "lint": "eslint ./src/**.js",
+    "coverage": "jest --coverage --config=conf/jest.config.js",
+    "test": "jest --config=conf/jest.config.js",
+    "test:watch": "jest --watch"
+  }
+}

src/index.js

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+import lesson0 from './lesson0';
+
+export default {
+  lesson0, // example lesson
+};

src/lesson0/index.js

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+import task0 from './task0';
+
+export default {
+  task0, // example task
+};

src/lesson0/task0.js

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+export function sum(a, b) {
+  return a + b;
+}
+
+export default {
+  sum,
+};