feat(request): CHECKOUT-2738 Add RequestSender

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitignore

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+*.log
+/coverage
+/node_modules

.travis.yml

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+language: node_js
+
+node_js: 6
+
+cache: yarn
+
+dist: trusty
+
+sudo: false
+
+before_install:
+    - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 0.27.5
+    - export PATH=$HOME/.yarn/bin:$PATH
+
+script: yarn travis

commit-validation.json

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+{
+    "scopes": [
+        "common",
+        "request"
+    ]
+}

eslintrc.json

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+{
+    "parser": "typescript-eslint-parser",
+    "env": {
+        "browser": true,
+        "es6": true,
+        "jest": true
+    },
+    "extends": "airbnb/base",
+    "parserOptions": {
+        "ecmaFeatures": {
+            "experimentalObjectRestSpread": true
+        }
+    },
+    "rules": {
+        "consistent-return": "off",
+        "indent": [2, 4],
+        "max-len": [0],
+        "no-console": "off",
+        "no-param-reassign": [2, { "props": false }],
+        "no-throw-literal": [0],
+        "no-shadow": "off",
+        "no-unused-expressions": "off",
+        "no-use-before-define": [2, "nofunc"],
+        "quote-props": [2, "consistent-as-needed"],
+        "valid-jsdoc": [
+            2,
+            {
+                "requireParamDescription": false,
+                "requireReturnDescription": false
+            }
+        ]
+    }
+}

jest-config.js

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+module.exports = {
+    browser: true,
+    transform: {
+        '\\.(ts|js)$': '<rootDir>/node_modules/ts-jest/preprocessor.js',
+    },
+    moduleFileExtensions: [
+        'ts',
+        'tsx',
+        'js',
+        'jsx',
+        'json',
+    ],
+    testRegex: '.*\\.spec.(js|ts)$',
+    setupTestFrameworkScriptFile: '<rootDir>/jest-setup.js',
+    collectCoverageFrom: [
+        'src/**/*.{js,ts}',
+    ],
+    coveragePathIgnorePatterns: [
+        '\\.mock\\.(js|ts)$',
+        '\\.typedef\\.(js|ts)$',
+    ],
+    coverageThreshold: {
+        global: {
+            branches: 80,
+            functions: 80,
+            lines: 80,
+            statements: 80,
+        },
+    },
+};

jest-setup.js

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+beforeAll(() => {
+    expect.hasAssertions();
+});

package.json

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+{
+  "name": "@bigcommerce/request-sender",
+  "version": "0.0.0",
+  "main": "lib/index.js",
+  "files": [
+    "lib/"
+  ],
+  "engines": {
+    "node": "^6.10.0",
+    "yarn": "^0.27.5"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/bigcommerce/request-sender-js.git"
+  },
+  "author": "BigCommerce",
+  "bugs": {
+    "url": "https://github.com/bigcommerce/request-sender-js/issues"
+  },
+  "homepage": "https://github.com/bigcommerce/request-sender-js",
+  "scripts": {
+    "prebuild": "yarn lint && yarn test",
+    "build": "yarn compile",
+    "precompile": "rm -rf lib",
+    "compile": "tsc --outDir lib",
+    "compile:watch": "yarn compile -- --watch",
+    "lint": "eslint src --config eslintrc.json",
+    "prerelease": "git fetch --tags && yarn validate-dependencies && yarn validate-commits && yarn build",
+    "release": "git add dist lib && standard-version -a",
+    "test": "jest --config jest-config.js",
+    "test:coverage": "yarn test -- --coverage",
+    "test:series": "yarn test -- --runInBand",
+    "test:watch": "yarn test -- --watch",
+    "travis": "yarn lint && yarn test:series --  --coverage",
+    "validate-commits": "validate-commits",
+    "validate-dependencies": "yarn install --check-files --frozen-lockfile"
+  },
+  "dependencies": {
+    "is-promise": "^2.1.0",
+    "js-cookie": "^2.1.4",
+    "query-string": "^5.0.0",
+    "tslib": "^1.8.0"
+  },
+  "devDependencies": {
+    "eslint": "2.8.0",
+    "eslint-config-airbnb": "6.0.2",
+    "eslint-plugin-react": "4.1.0",
+    "jest": "^21.2.1",
+    "standard-version": "^4.2.0",
+    "ts-jest": "^21.2.3",
+    "ts-loader": "^3.2.0",
+    "typescript": "^2.6.2",
+    "typescript-eslint-parser": "^9.0.1",
+    "validate-commits": "git+ssh://[email protected]/bigcommerce-labs/validate-commits.git#1.1.0"
+  }
+}

src/index.js

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+import * as cookie from 'js-cookie';
+import RequestFactory from './request-factory';
+import RequestSender from './request-sender';
+import PayloadTransformer from './payload-transformer';
+import Timeout from './timeout';
+
+/**
+ * @return {RequestSender}
+ */
+export function createRequestSender() {
+    return new RequestSender(
+        new RequestFactory(),
+        new PayloadTransformer(),
+        cookie
+    );
+}
+
+/**
+ * @param {number} [delay]
+ * @return {Timeout}
+ */
+export function createTimeout(delay) {
+    return new Timeout(delay);
+}

src/payload-transformer.js

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+const JSON_CONTENT_TYPE_REGEXP = /application\/(\w+\+)?json/;
+
+export default class PayloadTransformer {
+    /**
+     * @param {RequestOptions} options
+     * @returns {any}
+     */
+    toRequestBody(options) {
+        const contentType = this._getHeader(options.headers, 'Content-Type');
+
+        if (options.body && JSON_CONTENT_TYPE_REGEXP.test(contentType)) {
+            return JSON.stringify(options.body);
+        }
+
+        return options.body;
+    }
+
+    /**
+     * @param {XMLHttpRequest} xhr
+     * @returns {Response}
+     */
+    toResponse(xhr) {
+        const headers = this._parseResponseHeaders(xhr.getAllResponseHeaders());
+        const body = this._parseResponseBody('response' in xhr ? xhr.response : xhr.responseText, headers);
+
+        return {
+            body,
+            headers,
+            status: xhr.status,
+            statusText: xhr.statusText,
+        };
+    }
+
+    /**
+     * @private
+     * @param {string} body
+     * @param {Object} headers
+     * @return {any}
+     */
+    _parseResponseBody(body, headers) {
+        const contentType = this._getHeader(headers, 'Content-Type');
+
+        if (body && JSON_CONTENT_TYPE_REGEXP.test(contentType)) {
+            return JSON.parse(body);
+        }
+
+        return body;
+    }
+
+    /**
+     * @private
+     * @param {string} rawHeaders
+     * @return {Object}
+     */
+    _parseResponseHeaders(rawHeaders) {
+        const lines = rawHeaders ? rawHeaders.replace(/\r?\n[\t ]+/g, ' ').split(/\r?\n/) : [];
+
+        return lines.reduce((headers, line) => {
+            const parts = line.split(':');
+            const key = parts.shift().trim();
+
+            if (!key) {
+                return headers;
+            }
+
+            return {
+                ...headers,
+                [key.toLowerCase()]: parts.join(':').trim(),
+            };
+        }, {});
+    }
+
+    /**
+     * @private
+     * @param {Object} headers
+     * @param {string} key
+     * @return {string}
+     */
+    _getHeader(headers, key) {
+        if (!headers || !key) {
+            return '';
+        }
+
+        return headers[key] || headers[key.toLowerCase()] || '';
+    }
+}