diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 00000000..61b0ad35
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,14 @@
+# editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = crlf
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+
+[*.md]
+trim_trailing_whitespace = false
diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 00000000..bbf58eb6
--- /dev/null
+++ b/.eslintignore
@@ -0,0 +1,2 @@
+/.vscode
+node_modules
\ No newline at end of file
diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 00000000..ad70a432
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,15 @@
+module.exports = {
+    extends: "eslint:recommended",
+    env: {
+        "commonjs": true,
+        "node": true,
+        "es6": true
+    },
+    parserOptions: {
+        "ecmaVersion": 2018
+    },
+    rules: {
+        "no-console": "off",
+        "curly": "warn"
+    }
+};
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..9beacf63
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+# See https://help.github.com/ignore-files/ for more about ignoring files.
+
+# dependencies
+node_modules
+
+# misc
+.DS_Store
+
+npm-debug.log*
diff --git a/.npmrc b/.npmrc
new file mode 100644
index 00000000..ef4ebecb
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1,2 @@
+save-exact=true
+loglevel="error"
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 00000000..af23d986
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,10 @@
+/.vscode
+/node_modules
+package.json
+package-lock.json
+.eslintrc.js
+.eslintignore
+.gitignore
+.npmrc
+.editorconfig
+README.md
diff --git a/.prettierrc.js b/.prettierrc.js
new file mode 100644
index 00000000..31e93fd3
--- /dev/null
+++ b/.prettierrc.js
@@ -0,0 +1,4 @@
+module.exports = {
+    printWidth: 5000,
+    tabWidth: 4
+};
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 00000000..322b1e65
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,12 @@
+{
+    "recommendations": [
+        "formulahendry.auto-rename-tag",
+        "editorconfig.editorconfig",
+        "dbaeumer.vscode-eslint",
+        "eg2.vscode-npm-script",
+        "christian-kohler.npm-intellisense",
+        "christian-kohler.path-intellisense",
+        "esbenp.prettier-vscode",
+        "amatiasq.sort-imports"
+    ]
+}
diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 00000000..b73df06c
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,11 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Node",
+            "program": "${workspaceFolder}/src/scripts/start.js"
+        }
+    ]
+}
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 00000000..78e71f0c
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,20 @@
+{
+    "editor.minimap.enabled": false,
+    "editor.wordWrap": "off",
+    // Turns on auto format on save for all files types.
+    // This is also required to allow Prettier to auto format files on save.
+    "editor.formatOnSave": true,
+    // Turns it off for JavaScript since we use Prettier to auto format on save.
+    "javascript.format.enable": false,
+    "javascript.validate.enable": true,
+    "json.format.enable": false,
+    // Required to allow auto format on save with Prettier + ESLint + Vetur.
+    "eslint.autoFixOnSave": true,
+    "eslint.alwaysShowStatus": true,
+    "prettier.eslintIntegration": true,
+    "prettier.stylelintIntegration": true,
+    "sort-imports.suppress-warnings": true,
+    "search.exclude": {
+        "**/node_modules*": true
+    }
+}
diff --git a/README.md b/README.md
new file mode 100644
index 00000000..62715a6c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,181 @@
+# craco
+
+Create React App Configuration Override, an easy and comprehensible configuration layer for create-react-app v2.
+
+Get all the benefits of create-react-app **and** customization without using 'eject' by adding a single craco.config.js file at the root of your application and customize your eslint, babel, postcss configuration and many more..
+
+All you have to do is create your app using [create-react-app](https://github.com/facebook/create-react-app/) and customize the configuration with craco.config.js file.
+
+- [Configuration Overview](#configuration-overview) - Quickly see how you can configure your CRA installation with this plugin.
+- [Recipes](#creating-an-app) – Short and easy recipes for common use cases.
+- [Documentation](#documentation) - Have a deep understanding on how you can configure your CRA installation with this plugin.
+- [Develop a Plugin]() - How to develop a plugin for `craco`.
+
+**Acknowledgements:**
+
+We are grateful to [@timarney](https://github.com/timarney) the creator of [react-app-rewired](https://github.com/timarney/react-app-rewired) for is original idea.
+
+Also, the configuration style of this plugin tend to be influenced by the way [Vue CLI](https://cli.vuejs.org/guide/) do it.
+
+**Please Note:**
+
+By doing this you're breaking the ["guarantees"](https://github.com/facebookincubator/create-react-app/issues/99#issuecomment-234657710) that CRA provides. That is to say you now "own" the configs. **No support** will be provided. Proceed with caution.
+
+## Installation
+
+Install the plugin from **npm**:
+
+```bash
+$ npm install craco --save-dev
+```
+
+Create a `craco.config.js` file in the root directory:
+
+```
+my-app
+├── node_modules
+├── craco.config.js
+└── package.json
+```
+
+Export your configuration has as an **object literal**:
+
+```javascript
+/* craco.config.js */
+
+module.exports = {
+    ...
+}
+```
+
+or a **function**:
+
+```javascript
+/* craco.config.js */
+
+module.exports = function({ env, paths }) {
+    return {
+        ...
+    };
+}
+```
+
+Update the existing calls to `react-scripts` in the `scripts` section of your `package.json` file to use the `craco` CLI:
+
+```diff
+/* package.json */
+
+"scripts": {
+-   "start": "react-scripts start",
++   "start": "craco start",
+-   "build": "react-scripts build",
++   "build": "craco build"
+}
+```
+
+Start your app for development:
+
+```bash
+$ npm start
+```
+
+Or build your app:
+
+```bash
+$ npm run build
+```
+
+## CLI Options
+
+When you execute `craco start` or `craco build` a few options are available...
+
+To change the location of the configuration file:
+
+```bash
+$ npm start craco --config config/my-cra-customized-config.js
+```
+
+To use a custom version of the `react-scripts` packages with `craco`:
+
+```bash
+$ npm start craco --react-scripts react-scripts-ts
+```
+
+To activate the **verbose** mode:
+
+```bash
+$ npm start craco --verbose
+```
+
+## Configuration Overview
+
+When the property **mode** is available there are 2 possible values:
+- `extends`: the provided configuration will extends the CRA settings
+- `file`: the CRA settings will be reseted and you will provide an official configuration file for the plugin ([postcss](https://github.com/michael-ciniawsky/postcss-load-config#postcssrc), [eslint](https://eslint.org/docs/user-guide/configuring#configuration-file-formats)) that will supersede any settings.
+
+```javascript
+const { paths, when, whenDev, whenProd, ESLINT_MODES, POSTCSS_MODES } = require("craco");
+
+module.exports = {
+    style: {
+        modules: {
+            localIdentName: ""
+        },
+        css: {
+            loaderOptions: {} || (cssLoaderOptions, { env, paths }) => { return cssLoaderOptions; }
+        },
+        sass: {
+            loaderOptions: {} || (sassLoaderOptions, { env, paths }) => { return sassLoaderOptions; }
+        },
+        postcss: {
+            mode: "extends" || "file",
+            plugins: [],
+            loaderOptions: {} || (postcssLoaderOptions, { env, paths }) => { return postcssLoaderOptions; }
+        }
+    },
+    eslint: {
+        enable: true,
+        mode: "extends" || "file",
+        formatter: "",
+        globals: [],
+        plugins: [],
+        extends: [],
+        rules: {},
+        loaderOptions: {} || (eslintOptions, { env, paths }) => { return eslintOptions; }
+    },
+    webpack: {
+        alias: {},
+        plugins: []
+    },
+    configureWebpack: {} || (webpackConfig, { env, paths }) => { return webpackConfig; },
+    devServer: {},
+    babel: {
+        presets: [],
+        plugins: [],
+        loaderOptions: {} || (babelLoaderOptions, { env, paths }) => { return babelLoaderOptions; }
+    },
+    plugins: [
+        {
+            plugin: {
+                overrideCracoConfig: ({ cracoConfig, pluginOptions, context: { env, paths } }) => { return cracoConfig; },
+                overrideWebpackConfig: ({ webpackConfig, cracoConfig, pluginOptions, context: { env, paths } }) => { return webpackConfig; },
+            },
+            options: {}
+        }
+    ]
+};
+```
+
+## Documentation
+
+Coming soon...
+
+## Develop a plugin
+
+## Acknowledgements
+
+[@timarney](https://github.com/timarney) for having created [react-app-rewired](https://github.com/timarney/react-app-rewired).
+
+## License
+
+Create React App Config Override is open source software [licensed as MIT](https://github.com/facebook/create-react-app/blob/master/LICENSE).
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 00000000..ac352111
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1037 @@
+{
+  "name": "craco",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
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+      "dev": true,
+      "requires": {
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+      }
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+      "dev": true,
+      "requires": {
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+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
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+    },
+    "acorn-jsx": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-4.1.1.tgz",
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+      "dev": true,
+      "requires": {
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+      }
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+    "ajv": {
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+      "dev": true,
+      "requires": {
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+      "requires": {
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+      }
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+      }
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+        "isexe": "^2.0.0"
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+    "wordwrap": {
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+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
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+      "dev": true
+    },
+    "wrappy": {
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+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
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+    "write": {
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+      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
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+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 00000000..ae4e92d6
--- /dev/null
+++ b/package.json
@@ -0,0 +1,34 @@
+{
+  "name": "craco",
+  "version": "0.0.1",
+  "description": "Create React App Configuration Override, an easy and comprehensible configuration layer for create-react-app v2.",
+  "scripts": {},
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/Sharegate/craco.git"
+  },
+  "keywords": [
+    "react",
+    "create-react-app",
+    "cra"
+  ],
+  "author": "Sharegate",
+  "license": "Apache 2.0",
+  "bugs": {
+    "url": "https://github.com/Sharegate/craco/issues"
+  },
+  "homepage": "https://github.com/Sharegate/craco#readme",
+  "files": [
+    "src/**/*"
+  ],
+  "peerDependencies": {
+    "react-scripts": "^2.0.4"
+  },
+  "devDependencies": {
+    "eslint": "5.7.0"
+  },
+  "dependencies": {
+    "lodash.mergewith": "4.6.1",
+    "webpack-merge": "4.1.4"
+  }
+}
diff --git a/src/args.js b/src/args.js
new file mode 100644
index 00000000..838ae496
--- /dev/null
+++ b/src/args.js
@@ -0,0 +1,47 @@
+const { log } = require("./logger");
+
+const args = process.argv;
+
+function findArg(key) {
+    const index = args.indexOf(key);
+
+    return {
+        index,
+        isFound: index !== -1
+    };
+}
+
+function isFlagSet(flag) {
+    return findArg(flag).isFound;
+}
+
+function getValue(key) {
+    const result = (isOverrided = false, value) => ({
+        isOverrided,
+        value
+    });
+
+    const arg = findArg(key);
+
+    if (arg.isFound) {
+        const value = findArg(key);
+
+        if (value.isFound) {
+            return result(true, args[value.index]);
+        } else {
+            log(`No value has been provided for cli argument ${key}`);
+        }
+    }
+
+    return result();
+}
+
+const isVerbose = isFlagSet("--verbose");
+const reactScripts = getValue("--react-scripts");
+const config = getValue("--config");
+
+module.exports = {
+    isVerbose,
+    reactScripts,
+    config
+};
diff --git a/src/config.js b/src/config.js
new file mode 100644
index 00000000..6ff6837e
--- /dev/null
+++ b/src/config.js
@@ -0,0 +1,29 @@
+const args = require("./args");
+
+const { projectRoot } = require("./paths");
+const { isFunction } = require("./utils");
+const { log } = require("./logger");
+const { applyCracoConfigPlugins } = require("./features/plugins");
+
+function loadCracoConfig(context) {
+    let configFilePath = "";
+
+    if (args.config.isOverrided) {
+        configFilePath = require.resolve(`${projectRoot}/${args.config.value}`);
+    } else {
+        configFilePath = require.resolve(`${projectRoot}/craco.config.js`);
+    }
+
+    log("Found craco config file at: ", configFilePath);
+
+    const config = require(configFilePath);
+
+    let resultingConfig = isFunction(config) ? config(context) : config;
+    resultingConfig = applyCracoConfigPlugins(resultingConfig, context);
+
+    return resultingConfig;
+}
+
+module.exports = {
+    loadCracoConfig
+};
diff --git a/src/cra.js b/src/cra.js
new file mode 100644
index 00000000..86ccfd1f
--- /dev/null
+++ b/src/cra.js
@@ -0,0 +1,126 @@
+const path = require("path");
+const args = require("./args");
+
+const { log } = require("./logger");
+const { projectRoot, nodeModulesPath } = require("./paths");
+
+/************  Common  *******************/
+
+function discoverScriptsFolderPath() {
+    let filepath = "";
+
+    if (args.reactScripts.isOverrided) {
+        filepath = path.resolve(`${projectRoot}/${args.reactScripts.value}/`);
+    } else {
+        filepath = path.resolve(`${nodeModulesPath}/react-scripts/`);
+    }
+
+    log("Discovered react scripts folder at: ", filepath);
+
+    return filepath;
+}
+
+function resolveConfigFilePath(scriptsFolderPath, fileName) {
+    return require.resolve(`${scriptsFolderPath}/config/${fileName}`);
+}
+
+const scriptsFolderPath = discoverScriptsFolderPath();
+const craPaths = require(resolveConfigFilePath(scriptsFolderPath, "paths.js"));
+
+/************  Webpack Dev Config  *******************/
+
+function getWebpackDevConfigPath() {
+    return resolveConfigFilePath(scriptsFolderPath, "webpack.config.dev");
+}
+
+function loadWebpackDevConfig() {
+    const filepath = getWebpackDevConfigPath();
+
+    log("Found Webpack dev config at: ", filepath);
+
+    return require(filepath);
+}
+
+function overrideWebpackDevConfig(newConfig) {
+    const filepath = getWebpackDevConfigPath();
+
+    require.cache[filepath].exports = newConfig;
+
+    log(`Overrided require cache for module: ${filepath}`);
+}
+
+/************  Webpack Prod Config  *******************/
+
+function getWebpackProdConfigPath() {
+    return resolveConfigFilePath(scriptsFolderPath, "webpack.config.prod");
+}
+
+function loadWebpackProdConfig() {
+    const filepath = getWebpackProdConfigPath();
+
+    log("Found Webpack prod config at: ", filepath);
+
+    return require(filepath);
+}
+
+function overrideWebpackProdConfig(newConfig) {
+    const filepath = getWebpackProdConfigPath();
+
+    require.cache[filepath].exports = newConfig;
+
+    log(`Overrided require cache for module: ${filepath}`);
+}
+
+/************  Dev Server  *******************/
+
+function getDevServerConfigPath() {
+    return resolveConfigFilePath(scriptsFolderPath, "webpackDevServer.config.js");
+}
+
+function loadDevServerConfigProvider() {
+    const filepath = getDevServerConfigPath();
+
+    log("Found dev server config at: ", filepath);
+
+    return require(filepath);
+}
+
+function overrideDevServerConfigProvider(configProvider) {
+    const filepath = getDevServerConfigPath();
+
+    require.cache[filepath].exports = configProvider;
+
+    log(`Overrided cache for: ${filepath}`);
+}
+
+/************  Scripts  *******************/
+
+function start() {
+    const filepath = require.resolve(`${scriptsFolderPath}/scripts/start`);
+
+    log("Starting CRA at: ", filepath);
+
+    require(filepath);
+}
+
+function build() {
+    const filepath = require.resolve(`${scriptsFolderPath}/scripts/build`);
+
+    log("Building CRA at: ", filepath);
+
+    require(filepath);
+}
+
+/************  Exports  *******************/
+
+module.exports = {
+    loadWebpackDevConfig,
+    overrideWebpackDevConfig,
+    loadWebpackProdConfig,
+    overrideWebpackProdConfig,
+    loadDevServerConfigProvider,
+    overrideDevServerConfigProvider,
+    craPaths,
+    start,
+    build
+};
diff --git a/src/features/babel.js b/src/features/babel.js
new file mode 100644
index 00000000..b402a8d1
--- /dev/null
+++ b/src/features/babel.js
@@ -0,0 +1,82 @@
+const { getLoaders, loaderByName } = require("../loaders");
+const { log, error } = require("../logger");
+const { isFunction, isArray, deepMergeWithArray } = require("../utils");
+
+// TODO: CRA use a cacheIdentifier, should we update it with the other plugins?
+
+function addPresets(loader, babelPresets) {
+    if (isArray(babelPresets)) {
+        if (loader.options) {
+            loader.options.presets = babelPresets.concat(loader.options.presets || []);
+        } else {
+            loader.options = {
+                presets: babelPresets.concat(loader.options.presets || [])
+            };
+        }
+    }
+
+    log("Added Babel presets.");
+}
+
+function addPlugins(loader, babelPlugins) {
+    if (isArray(babelPlugins)) {
+        if (loader.options) {
+            loader.options.plugins = babelPlugins.concat(loader.options.plugins || []);
+        } else {
+            loader.options = {
+                plugins: babelPlugins.concat(loader.options.plugins || [])
+            };
+        }
+    }
+
+    log("Added Babel plugins.");
+}
+
+function applyLoaderOptions(loader, loaderOptions, context) {
+    if (isFunction(loaderOptions)) {
+        loader.options = loaderOptions(loader.options || {}, context);
+    } else {
+        // TODO: ensure is otherwise a plain object, if not, log an error.
+        loader.options = deepMergeWithArray(loader.options || {}, loaderOptions);
+    }
+
+    log("Applied Babel loader options.");
+}
+
+function overrideLoader(match, cracoConfig, context) {
+    const { presets, plugins, loaderOptions } = cracoConfig.babel;
+
+    if (presets) {
+        addPresets(match.loader, presets);
+    }
+
+    if (plugins) {
+        addPlugins(match.loader, plugins);
+    }
+
+    if (loaderOptions) {
+        applyLoaderOptions(match.loader, loaderOptions, context);
+    }
+}
+
+function overrideBabel(cracoConfig, webpackConfig, context) {
+    if (cracoConfig.babel) {
+        const { hasFoundAny, matches } = getLoaders(webpackConfig, loaderByName("babel-loader"));
+
+        if (!hasFoundAny) {
+            error("Cannot find any Babel loaders.");
+
+            return webpackConfig;
+        }
+
+        matches.forEach(x => {
+            overrideLoader(x, cracoConfig, context);
+        });
+    }
+
+    return webpackConfig;
+}
+
+module.exports = {
+    overrideBabel
+};
diff --git a/src/features/dev-server.js b/src/features/dev-server.js
new file mode 100644
index 00000000..a74dc2b1
--- /dev/null
+++ b/src/features/dev-server.js
@@ -0,0 +1,76 @@
+const merge = require("webpack-merge");
+
+const { isFunction, isString } = require("../utils");
+const { log } = require("../logger");
+const { overrideDevServerConfigProvider, loadDevServerConfigProvider } = require("../cra");
+
+function createConfigProviderProxy(cracoConfig, craDevServerConfigProvider, context) {
+    const proxy = (...rest) => {
+        const craDevServerConfig = craDevServerConfigProvider(...rest);
+        let mergedConfig;
+
+        if (isFunction(cracoConfig.devServer)) {
+            // DOC: The function can either mutate the config and return nothing, OR return a cloned or merged version of the config.
+            const resultingConfig = cracoConfig.devServer(craDevServerConfig, {
+                ...context,
+                ...rest
+            });
+
+            mergedConfig = resultingConfig || craDevServerConfig;
+        } else {
+            // TODO: ensure is otherwise a plain object, if not, log an error.
+            mergedConfig = merge(craDevServerConfig, cracoConfig.devServer);
+        }
+
+        log("Merged dev server config");
+
+        return mergedConfig;
+    };
+
+    return proxy;
+}
+
+function setEnvironmentVariable(envProperty, value) {
+    if (!isString(value)) {
+        process.env[envProperty] = value.toString();
+    } else {
+        process.env[envProperty] = value;
+    }
+}
+
+function setMatchingEnvironmentVariables({ browser, https, host, port, publicUrl }) {
+    if (browser) {
+        setEnvironmentVariable("BROWSER", browser);
+    }
+
+    if (https) {
+        setEnvironmentVariable("HTTPS", https);
+    }
+
+    if (host) {
+        setEnvironmentVariable("HOST", host);
+    }
+
+    if (port) {
+        setEnvironmentVariable("PORT", port);
+    }
+
+    if (publicUrl) {
+        setEnvironmentVariable("PUBLIC_URL", publicUrl);
+    }
+}
+
+function overrideDevServer(cracoConfig, context) {
+    if (cracoConfig.devServer) {
+        setMatchingEnvironmentVariables(cracoConfig.devServer);
+
+        const craDevServerConfigProvider = loadDevServerConfigProvider();
+        const proxy = createConfigProviderProxy(cracoConfig, craDevServerConfigProvider, context);
+
+        overrideDevServerConfigProvider(proxy);
+    }
+}
+
+module.exports = {
+    overrideDevServer
+};
diff --git a/src/features/eslint.js b/src/features/eslint.js
new file mode 100644
index 00000000..ec0481c5
--- /dev/null
+++ b/src/features/eslint.js
@@ -0,0 +1,131 @@
+const { getLoader, removeLoader, loaderByName } = require("../loaders");
+const { log, error } = require("../logger");
+const { isFunction, isArray, deepMergeWithArray } = require("../utils");
+
+const ESLINT_MODES = {
+    extends: "extends",
+    file: "file"
+};
+
+function disableEslint(webpackConfig) {
+    removeLoader(webpackConfig, loaderByName("eslint-loader"));
+
+    log("Disabled ESLint.");
+}
+
+function resetDefaultOptions(loader) {
+    loader.options.ignore = false;
+
+    log("Reseted ESLint default options.");
+}
+
+function setFormatter(loader, formatter) {
+    loader.options.formatter = formatter;
+
+    log("Applied ESLint formatter.");
+}
+
+function extendsEslint(loader, eslintConfig) {
+    let baseConfigExtends = {};
+
+    if (isArray(eslintConfig.globals)) {
+        baseConfigExtends.globals = eslintConfig.globals;
+
+        log("Applied ESLint globals.");
+    }
+
+    if (isArray(eslintConfig.plugins)) {
+        baseConfigExtends.plugins = eslintConfig.plugins;
+
+        log("Applied ESLint plugins.");
+    }
+
+    if (isArray(eslintConfig.extends)) {
+        baseConfigExtends.extends = eslintConfig.extends;
+
+        log("Applied ESLint extends.");
+    }
+
+    if (eslintConfig.rules) {
+        baseConfigExtends.rules = eslintConfig.rules;
+
+        log("Applied ESLint rules.");
+    }
+
+    if (loader.options) {
+        loader.options.baseConfig = deepMergeWithArray(loader.options.baseConfig || {}, baseConfigExtends);
+    } else {
+        loader.options = {
+            baseConfig: baseConfigExtends
+        };
+    }
+
+    log("Extended ESLint config.");
+}
+
+function useEslintConfigFile(loader) {
+    if (loader.options) {
+        loader.options.useEslintrc = true;
+        delete loader.options.baseConfig;
+    } else {
+        loader.options = {
+            useEslintrc: true
+        };
+    }
+
+    log("Overwrited ESLint config to use a config file.");
+}
+
+function applyLoaderOptions(loader, loaderOptions, context) {
+    if (isFunction(loaderOptions)) {
+        loader.options = loaderOptions(loader.options || {}, context);
+    } else {
+        // TODO: ensure is otherwise a plain object, if not, log an error.
+        loader.options = deepMergeWithArray(loader.options || {}, loaderOptions);
+    }
+
+    log("Applied ESLint loader options.");
+}
+
+function overrideEsLint(cracoConfig, webpackConfig, context) {
+    if (cracoConfig.eslint) {
+        const { isFound, match } = getLoader(webpackConfig, loaderByName("eslint-loader"));
+
+        if (!isFound) {
+            error("Cannot find ESLint loader (eslint-loader).");
+
+            return webpackConfig;
+        }
+
+        const { enable, mode, formatter, loaderOptions } = cracoConfig.eslint;
+
+        if (enable === false) {
+            disableEslint(webpackConfig);
+
+            return webpackConfig;
+        }
+
+        resetDefaultOptions(match.loader);
+
+        if (formatter) {
+            setFormatter(match.loader, formatter);
+        }
+
+        if (mode === ESLINT_MODES.file) {
+            useEslintConfigFile(match.loader);
+        } else {
+            extendsEslint(match.loader, cracoConfig.eslint, context);
+        }
+
+        if (loaderOptions) {
+            applyLoaderOptions(match.loader, loaderOptions);
+        }
+    }
+
+    return webpackConfig;
+}
+
+module.exports = {
+    overrideEsLint,
+    ESLINT_MODES
+};
diff --git a/src/features/plugins.js b/src/features/plugins.js
new file mode 100644
index 00000000..33ca0375
--- /dev/null
+++ b/src/features/plugins.js
@@ -0,0 +1,72 @@
+const { isArray, isFunction } = require("../utils");
+const { log } = require("../logger");
+
+/************  Craco Config  *******************/
+
+function overrideCracoConfig({ plugin, options }, cracoConfig, context) {
+    if (isFunction(plugin.overrideCracoConfig)) {
+        const resultingConfig = plugin.overrideCracoConfig({
+            cracoConfig: cracoConfig,
+            pluginOptions: options,
+            context: context
+        });
+
+        if (!resultingConfig) {
+            throw new Error("craco: Plugin returned an undefined craco config.");
+        }
+    }
+
+    log("Overrided Craco config with plugin.");
+
+    return cracoConfig;
+}
+
+function applyCracoConfigPlugins(cracoConfig, context) {
+    if (isArray(cracoConfig.plugins)) {
+        cracoConfig.plugins.forEach(x => {
+            cracoConfig = overrideCracoConfig(x, cracoConfig, context);
+        });
+    }
+
+    log("Applied Craco config plugins.");
+
+    return cracoConfig;
+}
+
+/************  Webpack Config  *******************/
+
+function overrideWebpack({ plugin, options }, cracoConfig, webpackConfig, context) {
+    if (isFunction(plugin.overrideWebpackConfig)) {
+        const resultingConfig = plugin.overrideWebpackConfig({
+            cracoConfig: cracoConfig,
+            webpackConfig: webpackConfig,
+            pluginOptions: options,
+            context: context
+        });
+
+        if (!resultingConfig) {
+            throw new Error("craco: Plugin returned an undefined Webpack config.");
+        }
+    }
+
+    log("Overrided Webpack config with plugin.");
+
+    return webpackConfig;
+}
+
+function applyWebpackConfigPlugins(cracoConfig, webpackConfig, context) {
+    if (isArray(cracoConfig.plugins)) {
+        cracoConfig.plugins.forEach(x => {
+            webpackConfig = overrideWebpack(x, cracoConfig, webpackConfig, context);
+        });
+    }
+
+    log("Applied Webpack config plugins.");
+
+    return webpackConfig;
+}
+
+module.exports = {
+    applyCracoConfigPlugins,
+    applyWebpackConfigPlugins
+};
diff --git a/src/features/style/css.js b/src/features/style/css.js
new file mode 100644
index 00000000..92a7ff1c
--- /dev/null
+++ b/src/features/style/css.js
@@ -0,0 +1,77 @@
+const { getLoaders, loaderByName } = require("../../loaders");
+const { log, error } = require("../../logger");
+const { isFunction, deepMergeWithArray } = require("../../utils");
+
+function setModuleLocalIdentName(match, localIdentName) {
+    if (match.loader.options) {
+        delete match.loader.options.getLocalIdent;
+        match.loader.options.localIdentName = localIdentName;
+    } else {
+        match.loader.options = {
+            localIdentName: localIdentName
+        };
+    }
+
+    log("Overrided CSS modules local ident name.");
+}
+
+function applyLoaderOptions(match, loaderOptions, context) {
+    if (isFunction(loaderOptions)) {
+        match.loader.options = loaderOptions(match.loader.options || {}, context);
+    } else {
+        // TODO: ensure is otherwise a plain object, if not, log an error.
+        match.loader.options = deepMergeWithArray(match.loader.options || {}, loaderOptions);
+    }
+
+    log("Applied CSS loaders options.");
+}
+
+function overrideCssLoader(match, cssOptions, context) {
+    if (cssOptions.loaderOptions) {
+        applyLoaderOptions(match, cssOptions.loaderOptions, context);
+    }
+
+    log("Overrided CSS loader.");
+}
+
+function overrideModuleLoader(match, modulesOptions) {
+    if (modulesOptions.localIdentName) {
+        setModuleLocalIdentName(match, modulesOptions.localIdentName);
+    }
+
+    log("Overrided CSS module loader.");
+}
+
+function overrideCss(styleConfig, webpackConfig, context) {
+    if (styleConfig.modules || styleConfig.css) {
+        const { hasFoundAny, matches } = getLoaders(webpackConfig, loaderByName("css-loader"));
+
+        // console.log(JSON.stringify(webpackConfig, null, 2));
+
+        if (!hasFoundAny) {
+            error("Cannot find any CSS loaders.");
+
+            return webpackConfig;
+        }
+
+        if (styleConfig.modules) {
+            const cssModuleLoaders = matches.filter(x => x.loader.options && x.loader.options.modules === true);
+
+            cssModuleLoaders.forEach(x => {
+                overrideModuleLoader(x, styleConfig.modules);
+            });
+        }
+
+        if (styleConfig.css) {
+            matches.forEach(x => {
+                overrideCssLoader(x, styleConfig.css, context);
+            });
+        }
+    }
+
+    return webpackConfig;
+}
+
+module.exports = {
+    overrideCss
+};
diff --git a/src/features/style/postcss.js b/src/features/style/postcss.js
new file mode 100644
index 00000000..aa2f6317
--- /dev/null
+++ b/src/features/style/postcss.js
@@ -0,0 +1,93 @@
+const { getLoaders, loaderByName } = require("../../loaders");
+const { log, error } = require("../../logger");
+const { isArray, isFunction, deepMergeWithArray } = require("../../utils");
+
+const POSTCSS_MODES = {
+    extends: "extends",
+    file: "file"
+};
+
+function usePostcssConfigFile(match) {
+    if (match.loader.options) {
+        const ident = match.loader.options.ident;
+
+        match.loader.options = {
+            ident: ident
+        };
+    }
+
+    log("Overwrited PostCSS config to use a config file.");
+}
+
+function extendsPostcss(match, { plugins }) {
+    if (plugins) {
+        addPlugins(match, plugins);
+    }
+}
+
+function addPlugins(match, postcssPlugins) {
+    if (isArray(postcssPlugins)) {
+        if (match.loader.options) {
+            const craPlugins = match.loader.options.plugins();
+            const mergedPlugins = postcssPlugins.concat(craPlugins || []);
+
+            match.loader.options.plugins = () => mergedPlugins;
+        } else {
+            match.loader.options = {
+                plugins: () => postcssPlugins
+            };
+        }
+
+        log("Added PostCSS plugins.");
+    }
+}
+
+function applyLoaderOptions(match, loaderOptions, context) {
+    if (isFunction(loaderOptions)) {
+        match.loader.options = loaderOptions(match.loader.options || {}, context);
+    } else {
+        // TODO: ensure is otherwise a plain object, if not, log an error.
+        match.loader.options = deepMergeWithArray(match.loader.options || {}, loaderOptions);
+    }
+
+    log("Applied PostCSS loaders options.");
+}
+
+function overrideLoader(match, postcssConfig) {
+    const { mode, loaderOptions } = postcssConfig;
+
+    if (mode === POSTCSS_MODES.file) {
+        usePostcssConfigFile(match);
+    } else {
+        extendsPostcss(match, postcssConfig);
+    }
+
+    if (loaderOptions) {
+        applyLoaderOptions(match, loaderOptions);
+    }
+
+    log("Overrided PostCSS loader.");
+}
+
+function overridePostcss(cracoConfig, webpackConfig) {
+    if (cracoConfig.postcss) {
+        const { hasFoundAny, matches } = getLoaders(webpackConfig, loaderByName("postcss-loader"));
+
+        if (!hasFoundAny) {
+            error("Cannot find any PostCSS loaders.");
+
+            return webpackConfig;
+        }
+
+        matches.forEach(x => {
+            overrideLoader(x, cracoConfig.postcss);
+        });
+    }
+
+    return webpackConfig;
+}
+
+module.exports = {
+    overridePostcss,
+    POSTCSS_MODES
+};
diff --git a/src/features/style/sass.js b/src/features/style/sass.js
new file mode 100644
index 00000000..92ddb7c2
--- /dev/null
+++ b/src/features/style/sass.js
@@ -0,0 +1,61 @@
+const { getLoaders, loaderByName } = require("../../loaders");
+const { log, error } = require("../../logger");
+const { isString, isFunction, deepMergeWithArray } = require("../../utils");
+
+function setLoaderProperty(match, key, valueProviders) {
+    if (isString(match.loader)) {
+        match.parent[match.index] = {
+            loader: match.loader,
+            [key]: valueProviders.whenString()
+        };
+    } else {
+        match.loader[key] = valueProviders.whenObject();
+    }
+}
+
+function applyLoaderOptions(match, loaderOptions, context) {
+    if (isFunction(loaderOptions)) {
+        setLoaderProperty(match, "options", {
+            whenString: () => loaderOptions({}, context),
+            whenObject: () => loaderOptions(match.loader.options || {}, context)
+        });
+    } else {
+        // TODO: ensure is otherwise a plain object, if not, log an error.
+        setLoaderProperty(match, "options", {
+            whenString: () => loaderOptions,
+            whenObject: () => deepMergeWithArray(match.loader.options || {}, loaderOptions)
+        });
+    }
+
+    log("Applied SASS loaders options.");
+}
+
+function overrideLoader(match, sassOptions) {
+    if (sassOptions.loaderOptions) {
+        applyLoaderOptions(match, sassOptions.loaderOptions);
+    }
+
+    log("Overrided SASS loader.");
+}
+
+function overrideSass(styleConfig, webpackConfig) {
+    if (styleConfig.sass) {
+        const { hasFoundAny, matches } = getLoaders(webpackConfig, loaderByName("sass-loader"));
+
+        if (!hasFoundAny) {
+            error("Cannot find any SASS loaders.");
+
+            return webpackConfig;
+        }
+
+        matches.forEach(x => {
+            overrideLoader(x, styleConfig.sass.loaderOptions);
+        });
+    }
+
+    return webpackConfig;
+}
+
+module.exports = {
+    overrideSass
+};
diff --git a/src/features/style/style.js b/src/features/style/style.js
new file mode 100644
index 00000000..4c912f83
--- /dev/null
+++ b/src/features/style/style.js
@@ -0,0 +1,17 @@
+const { overrideCss } = require("./css");
+const { overrideSass } = require("./sass");
+const { overridePostcss } = require("./postcss");
+
+function overrideStyle(cracoConfig, webpackConfig, context) {
+    if (cracoConfig.style) {
+        webpackConfig = overrideCss(cracoConfig.style, webpackConfig, context);
+        webpackConfig = overrideSass(cracoConfig.style, webpackConfig, context);
+        webpackConfig = overridePostcss(cracoConfig.style, webpackConfig, context);
+    }
+
+    return webpackConfig;
+}
+
+module.exports = {
+    overrideStyle
+};
diff --git a/src/features/webpack.js b/src/features/webpack.js
new file mode 100644
index 00000000..ec7a00ab
--- /dev/null
+++ b/src/features/webpack.js
@@ -0,0 +1,67 @@
+const merge = require("webpack-merge");
+
+const { isFunction, isArray } = require("../utils");
+const { log } = require("../logger");
+const { overrideBabel } = require("./babel");
+const { overrideEsLint } = require("./eslint");
+const { overrideStyle } = require("./style/style");
+const { applyWebpackConfigPlugins } = require("./plugins");
+
+function addAlias(webpackConfig, webpackAlias) {
+    webpackConfig.resolve.alias = Object.assign(webpackConfig.resolve.alias || {}, webpackAlias);
+
+    log("Added Webpack alias.");
+}
+
+function addPlugins(webpackConfig, webpackPlugins) {
+    if (isArray(webpackPlugins)) {
+        webpackConfig.plugins = webpackPlugins.concat(webpackConfig.plugins || []);
+
+        log("Added Webpack plugins.");
+    }
+}
+
+function giveTotalControl(webpackConfig, configureWebpack, context) {
+    let mergedConfig;
+
+    if (isFunction(configureWebpack)) {
+        mergedConfig = configureWebpack(webpackConfig, context);
+    } else {
+        // TODO: ensure is otherwise a plain object, if not, log an error.
+        mergedConfig = merge(webpackConfig, configureWebpack);
+    }
+
+    log("Merged Webpack config with configureWebpack.");
+
+    return mergedConfig;
+}
+
+function overrideWebpack(cracoConfig, webpackConfig, overrideConfig, context) {
+    if (cracoConfig.webpack) {
+        const { alias, plugins } = cracoConfig.webpack;
+
+        if (alias) {
+            addAlias(webpackConfig, alias);
+        }
+
+        if (plugins) {
+            addPlugins(webpackConfig, plugins);
+        }
+    }
+
+    webpackConfig = overrideBabel(cracoConfig, webpackConfig, context);
+    webpackConfig = overrideEsLint(cracoConfig, webpackConfig, context);
+    webpackConfig = overrideStyle(cracoConfig, webpackConfig, context);
+
+    if (cracoConfig.configureWebpack) {
+        webpackConfig = giveTotalControl(webpackConfig, cracoConfig.configureWebpack, context);
+    }
+
+    webpackConfig = applyWebpackConfigPlugins(cracoConfig, webpackConfig, context);
+
+    overrideConfig(webpackConfig);
+}
+
+module.exports = {
+    overrideWebpack
+};
diff --git a/src/index.js b/src/index.js
new file mode 100644
index 00000000..68f4b2a2
--- /dev/null
+++ b/src/index.js
@@ -0,0 +1,32 @@
+const { craPaths } = require("./cra");
+const { getLoader, removeLoader, loaderByName } = require("./loaders");
+const { ESLINT_MODES } = require("./features/eslint");
+const { POSTCSS_MODES } = require("./features/style/postcss");
+
+function when(condition, fct) {
+    if (condition) {
+        return fct();
+    }
+
+    return undefined;
+}
+
+function whenDev(fct) {
+    return when(process.env.NODE_ENV === "development", fct);
+}
+
+function whenProd(fct) {
+    return when(process.env.NODE_ENV === "production", fct);
+}
+
+module.exports = {
+    paths: craPaths,
+    getLoader,
+    removeLoader,
+    loaderByName,
+    when,
+    whenDev,
+    whenProd,
+    ESLINT_MODES,
+    POSTCSS_MODES
+};
diff --git a/src/loaders.js b/src/loaders.js
new file mode 100644
index 00000000..89c74bfa
--- /dev/null
+++ b/src/loaders.js
@@ -0,0 +1,111 @@
+const path = require("path");
+
+const { isString, isArray } = require("./utils");
+
+function loaderByName(targetLoaderName) {
+    return rule => {
+        if (isString(rule.loader)) {
+            return rule.loader.indexOf(`${path.sep}${targetLoaderName}${path.sep}`) !== -1 || rule.loader.indexOf(`@${targetLoaderName}${path.sep}`) !== -1;
+        } else if (isString(rule)) {
+            return rule.indexOf(`${path.sep}${targetLoaderName}${path.sep}`) !== -1 || rule.indexOf(`@${targetLoaderName}${path.sep}`) !== -1;
+        }
+
+        return false;
+    };
+}
+
+function toMatchingLoader(loader, parent, index) {
+    return {
+        loader,
+        parent,
+        index
+    };
+}
+
+function getLoaderRecursively(rules, matcher) {
+    let loader;
+
+    rules.some((rule, index) => {
+        if (rule) {
+            if (matcher(rule)) {
+                loader = toMatchingLoader(rule, rules, index);
+            } else if (rule.use) {
+                loader = getLoaderRecursively(rule.use, matcher);
+            } else if (rule.oneOf) {
+                loader = getLoaderRecursively(rule.oneOf, matcher);
+            } else if (isArray(rule.loader)) {
+                loader = getLoaderRecursively(rule.loader, matcher);
+            }
+        }
+
+        return loader !== undefined;
+    });
+
+    return loader;
+}
+
+function getLoader(webpackConfig, matcher) {
+    const matchingLoader = getLoaderRecursively(webpackConfig.module.rules, matcher);
+
+    return {
+        isFound: matchingLoader !== undefined,
+        match: matchingLoader
+    };
+}
+
+function getLoadersRecursively(rules, matcher, matchingLoaders) {
+    rules.forEach((rule, index) => {
+        if (rule) {
+            if (matcher(rule)) {
+                matchingLoaders.push(toMatchingLoader(rule, rules, index));
+            } else if (rule.use) {
+                getLoadersRecursively(rule.use, matcher, matchingLoaders);
+            } else if (rule.oneOf) {
+                getLoadersRecursively(rule.oneOf, matcher, matchingLoaders);
+            } else if (isArray(rule.loader)) {
+                getLoadersRecursively(rule.loader, matcher, matchingLoaders);
+            }
+        }
+    });
+}
+
+function getLoaders(webpackConfig, matcher) {
+    const matchingLoaders = [];
+
+    getLoadersRecursively(webpackConfig.module.rules, matcher, matchingLoaders);
+
+    return {
+        hasFoundAny: matchingLoaders.length !== 0,
+        matches: matchingLoaders
+    };
+}
+
+function removeLoaderRecursively(rules, matcher) {
+    for (let i = 0, max = rules.length; i < max; i += 1) {
+        const rule = rules[i];
+
+        if (rule) {
+            if (matcher(rule)) {
+                rules.splice(i, 1);
+                break;
+            } else if (rule.use) {
+                rule.use = removeLoaderRecursively(rule.use, matcher);
+            } else if (rule.oneOf) {
+                rule.oneOf = removeLoaderRecursively(rule.oneOf, matcher);
+            }
+        }
+    }
+
+    return rules;
+}
+
+function removeLoader(webpackConfig, matcher) {
+    webpackConfig.module.rules = removeLoaderRecursively(webpackConfig.module.rules, matcher);
+}
+
+module.exports = {
+    getLoader,
+    getLoaders,
+    removeLoader,
+    loaderByName
+};
diff --git a/src/logger.js b/src/logger.js
new file mode 100644
index 00000000..10d56f31
--- /dev/null
+++ b/src/logger.js
@@ -0,0 +1,23 @@
+const args = require("./args");
+
+function log(...rest) {
+    if (args.isVerbose) {
+        console.log("craco: ", ...rest);
+    }
+}
+
+function lazyLog(fct) {
+    if (args.isVerbose) {
+        fct();
+    }
+}
+
+function error(...rest) {
+    console.error("craco:  ***", ...rest, "***");
+}
+
+module.exports = {
+    log,
+    lazyLog,
+    error
+};
diff --git a/src/paths.js b/src/paths.js
new file mode 100644
index 00000000..5303f6e1
--- /dev/null
+++ b/src/paths.js
@@ -0,0 +1,10 @@
+const path = require("path");
+const fs = require("fs");
+
+const projectRoot = path.resolve(fs.realpathSync(process.cwd()));
+const nodeModulesPath = path.resolve(projectRoot, "node_modules");
+
+module.exports = {
+    projectRoot,
+    nodeModulesPath
+};
diff --git a/src/scripts/build.js b/src/scripts/build.js
new file mode 100644
index 00000000..ef75ce82
--- /dev/null
+++ b/src/scripts/build.js
@@ -0,0 +1,21 @@
+process.env.NODE_ENV = "production";
+
+const { log } = require("../logger");
+const { craPaths, loadWebpackProdConfig, overrideWebpackProdConfig, build } = require("../cra");
+const { loadCracoConfig } = require("../config");
+const { overrideWebpack } = require("../features/webpack");
+
+log("Override started with arguments: ", process.argv);
+log("For environment: ", process.env.NODE_ENV);
+
+const context = {
+    env: process.env.NODE_ENV,
+    paths: craPaths
+};
+
+const cracoConfig = loadCracoConfig(context);
+const craWebpackConfig = loadWebpackProdConfig();
+
+overrideWebpack(cracoConfig, craWebpackConfig, overrideWebpackProdConfig, context);
+
+build();
diff --git a/src/scripts/start.js b/src/scripts/start.js
new file mode 100644
index 00000000..800cd7a1
--- /dev/null
+++ b/src/scripts/start.js
@@ -0,0 +1,23 @@
+process.env.NODE_ENV = process.env.NODE_ENV || "development";
+
+const { log } = require("../logger");
+const { craPaths, loadWebpackDevConfig, overrideWebpackDevConfig, start } = require("../cra");
+const { loadCracoConfig } = require("../config");
+const { overrideWebpack } = require("../features/webpack");
+const { overrideDevServer } = require("../features/dev-server");
+
+log("Override started with arguments: ", process.argv);
+log("For environment: ", process.env.NODE_ENV);
+
+const context = {
+    env: process.env.NODE_ENV,
+    paths: craPaths
+};
+
+const cracoConfig = loadCracoConfig(context);
+const craWebpackConfig = loadWebpackDevConfig();
+
+overrideWebpack(cracoConfig, craWebpackConfig, overrideWebpackDevConfig, context);
+overrideDevServer(cracoConfig, context);
+
+start();
diff --git a/src/scripts/tests.js b/src/scripts/tests.js
new file mode 100644
index 00000000..e69de29b
diff --git a/src/utils.js b/src/utils.js
new file mode 100644
index 00000000..d0a565db
--- /dev/null
+++ b/src/utils.js
@@ -0,0 +1,28 @@
+const mergeWith = require("lodash.mergewith");
+
+function isFunction(value) {
+    return typeof value === "function";
+}
+
+function isArray(value) {
+    return Array.isArray(value);
+}
+
+function isString(value) {
+    return typeof value === "string";
+}
+
+function deepMergeWithArray(...rest) {
+    return mergeWith(...rest, (x, y) => {
+        if (isArray(x)) {
+            return x.concat(y);
+        }
+    });
+}
+
+module.exports = {
+    isFunction,
+    isArray,
+    isString,
+    deepMergeWithArray
+};