Babel Parser Babel Eslint

$ cnpm install babel-preset-stage-. Tweet with a location. Babel (for ES6 syntax highlighting), SublimeLinter + SublimeLinter-contrib-eslint_d (for linting) SublimeCodeIntel (for intellisense) Everything works really well except that it is slow and I mean really slow, my box is not very strong and this combination totally cripples it - sublime sometime just freezes for up to 20 seconds!. Linting via babel-eslint ESLint doesn't support new language features until they reach Stage 4 of the proposals process. Teo Jun Sheng, Pierre babel-eslint - ESLint using Babel as the parser. It uses browserslist to parse this information, so we can use any valid query format supported by browserslist. In GatsbyJS we only want the TypeScript type-checking though, because Gatsby already uses Babel to transpile our ESNext code. I don`t get why I have to have so many configuration files in a project. (기본값이 아니기 때문). {"_id":"eslint","_rev":"717-a51b9a2f0c2e075fb159bff36533570f","name":"eslint","description":"An AST-based pattern checker for JavaScript. You have to configure ESLint to use the correct parser options. The Babel team maintain babel-estlint, a tool that lets you lint any valid Babel code using ESLint. json (or js equivalent):. (In the upcoming 1. OK, I Understand. npm install --save-dev babel-core babel-eslint babel-loader babel-polyfill babel-core : 如果某些代码需要调用Babel的API进行转码,就要使用 babel-core 模块。 babel-eslint : 允许使用ESLint来检查所有有效的Babel代码。. Otherwise try the default parser (you don't have to use it just because you are using Babel). io server and frontend", "private": true, "keywords": [ "GitHub", "badge", "SVG", "image. npm i -g eslint This installs the ESLint CLI from the npm repository. babel-eslint npm install -- save - dev eslint eslint - cli eslint - loader eslint - config - airbnb eslint - plugin - react eslint - plugin - jsx - a11y npm install -- save - dev eslint - plugin - import eslint - import - resolver - webpack babel - eslint. 20 removed ^ in all babel's on package. x, the babel package has been deprecated in favor of babel-cli. e babel-core, babel-loader, babel-register, babel-node,babel-cli etc all plugins same version [email protected] An eslint plugin companion to babel-eslint. If you are using previous versions of ESLint, you have to install babel-eslint, typescript-eslint-parser, or eslint-plugin-typescript because ESLint 4. For questions and support please visit the #discussion babel slack channel (sign up here) or eslint gitter!. 3 The table below lists third party software that is provided with Confluent Platform 5. 😅I'll be updating this article from time to time, so if you find something wrong or find something that can be improved, please do leave a. npm install --save-dev eslint babel-eslint eslint-plugin-react. eslintrc で typescript-eslint-parser を指定しても先に babel-eslint が参照されてしまうようでうまく ESLint が動作しなかった(これが仕様なのかどうかはちゃんとに調べていない…)。. Now I can use ESLint on TypeScript, using the Babel plugin. [Updated on 2019-09-13] I have written a step-by-step guide on how to write a babel transformation plugin. Third Party Software Third Party Software included in Confluent Platform 5. Published: 2016. Create a file called babel. Babel is a high-performance language interoperability tool. So let's go ahead and console log that. Use Babel as your ESLint parser. It is based on ESTree spec […] The package provides two functionalities but we will focus just focus on the parse functionality. {"parser": "babel-eslint",. SYNC missed versions from official npm registry. eslintrc config file. babel-eslint allows you to lint ALL valid Babel code with the fantastic ESLint. Its goal is to provide a pluggable linting utility for JavaScript. transform和babylon. While ESLint supports custom parsers, some of the syntax supported by Babel isn't directly. $ cnpm install @babel/core. Requires Node 4 or greater. AST in ESLint. 幸いにも babel が babel-eslint というプラグインを提供しているので利用します。ふつうに npm i -D babel-eslint して、前述の例のように parser フィールドに 'babel-eslint' を指定すればOKです。. 'react/prop-types': 'warn', // NOTE (k1): The latest version of eslint-plugin-react catches a lot more, we cannot easily re-enable this without correcting the problem everywhere. It’s related to library, libraryTarget and umdNamedDefine properties. 😅I’ll be updating this article from time to time, so if you find something wrong or find something that can be improved, please do leave a. Lots of projects use babylon besides babel, though, so this could be a big boost for the ecosystem as a whole. eslintrc config file. The following are code examples for showing how to use babel. We've been working to develop the testing story for Babel, integrating Test262 into Babylon, Babel's parsing engine. Otherwise try the default parser (you don't have to use it just because you are using Babel). $ cnpm install @babel/core. x release, babel-eslint now requires Babel as a peer dependency and expects a valid Babel configuration file to exist. Sometimes you might see a lot of ESLint rule violations on your command line or in your IDE/editor. Less than 5 minutes of cuts to Babelthe total length of the domestic screening of Babel is nearly 140 minutes, just three or four minutes shorter than the overseas version. Estoy implementando eslint con babel-node y nodemon pero quiero que el mismo comando de npm start arranque eslint a la par de babel-node y nodemon gestione los cambios para reiniciar el proyecto. Babel ESLint允许你将所有有效的Babel代码与奇妙的 ESLint代码。 为什么使用 babel-eslint. 01:14:16 Henry: Yeah. Handles ES6 with babel. AST in ESLint. React with Babel. npm install babel-eslint eslint-plugin-flowtype --global. Part of the beauty of ESLint is that it allows you to configure plugins that have the opportunity to create and set rules for you. Maintain your code quality with ease. SYNC missed versions from official npm registry. Feature Performance table for ES6+ (used in babel-preset-env under new option e. Kliment Petrov - JavaScript Developer, in love with Javascript and Web Technologies. If you are using previous versions of ESLint, you have to install babel-eslint, typescript-eslint-parser, or eslint-plugin-typescript because ESLint 4. This seems to help babel and ESLint get along a little better than using the default parser. The fix that worked for me was installing the babel-eslint package (npm install babel-eslint --save-dev or yarn add babel-eslint -D). Unexpected token errors are caused by incompatibilities in your parser options and the code you're writing. npm i -g eslint This installs the ESLint CLI from the npm repository. A wrapper for Babel's parser used for ESLint. Babel is a free and open-source JavaScript compiler that is mainly used to convert ECMAScript 2015+ (ES6+) code into a backwards compatible version of JavaScript that can be run by older JavaScript engines. e I had removed [email protected]^7. Otherwise try the default parser (you don't have to use it just because you are using Babel). eslint-loader - tells webpack that we are going to use eslint in our build babel-eslint - provides linting for ES6 code. A JavaScript parser. If you are using previous versions of ESLint, you have to install babel-eslint, typescript-eslint-parser, or eslint-plugin-typescript because ESLint 4. I have set my parser to babel-eslint which is supposed to accept the do expressions. ESLint is my absolute favourite linting tool, and it sucked that nothing like it existed for TypeScript. And with a knowledge of how it works, you can extend these and other tools to do some mind. The parser just breaks the text into AST nodes, which then need to be processed somehow. This project was one of the hardest projects to work on: because it is just a compatibility layer between Babel and ESLint there is inherently a constant need for updates when either projects update and a high risk of unexpected changes due to monkey-patching. Babel Preset - ENV. Discover Tips. It then compiles these into a gettext POT formatted file as a template for translation. However there is a caveat. Feature Performance table for ES6+ (used in babel-preset-env under new option e. {"parser": "babel-eslint",. 0 release Doesn't work with custom parser through `parserOverride` #786 opened Jul 30, 2019 by nfantone [email protected] 0 and earlier do not support scoped packages. 幸いにも babel が babel-eslint というプラグインを提供しているので利用します。ふつうに npm i -D babel-eslint して、前述の例のように parser フィールドに 'babel-eslint' を指定すればOKです。. {"_id":"eslint","_rev":"717-a51b9a2f0c2e075fb159bff36533570f","name":"eslint","description":"An AST-based pattern checker for JavaScript. [r/rcbredditbot] Unexpected token import with Jest (babel-eslint not available from tested file, symlink env) (from /r/reactjs) If you follow any of the above links, please respect the rules of reddit and don't vote in the other threads. eslintrc file:. babel-eslint allows you to lint ALL valid Babel code with the fantastic ESLint. Typescript, Babel, Webpack, ESLint: my configuration. Babel has a JavaScript parser called "babylon" which turns your string of code into an AST (it's literally just a JavaScript object), then Babel hands pieces of this to your babel plugin for you to operate on it. Buy generic cialis softtabs Create project. eslint-plugin-react - Since we are going to use React, we have to install the React plugin for eslint. In the embedded Terminal (Ctrl+Alt+1), type: npm install eslint babel-eslint --save-dev. This clearly stated that babel-eslint is installed globally. After configure, you can do: msgfmt po/ast. If you are using previous versions of ESLint, you have to install babel-eslint, typescript-eslint-parser, or eslint-plugin-typescript because ESLint 4. babel-eslint,babel团队维护的,用于配合使用ESLint, GitHub - babel/babel-eslint: ESLint using Babel as the parser. The latest ECMAScript version enabled by default (ES2017). SYNC missed versions from official npm registry. The easiest way to configure eslint is through. About Babel. babel-eslint allows you to lint ALL valid Babel code with the fantastic ESLint. io", "version": "0. eslint is a linting tool and eslint-config-standard is a set of configurations for eslint that we'll write our code against which follows the JS Standard style. devDependency として追加して. It's important that ESLint is used within your Webpack build to enforce your code style for every of your npm scripts which run Webpack. eslintrc with Babel parser support (via babel-eslint package) -. This is a standalone version of the syntax given with vscode-flowtype. e babel-core, babel-loader, babel-register, babel-node,babel-cli etc all plugins same version [email protected] If you are using previous versions of ESLint, you have to install babel-eslint, typescript-eslint-parser, or eslint-plugin-typescript because ESLint 4. Kliment Petrov - JavaScript Developer, in love with Javascript and Web Technologies. It is a json file, so edit it in emacs and create something like this. babel-eslint does a great job at adapting eslint for use with Babel, but it can't change the built in rules to support experimental features. Apologizes, turns out it was an ESLint issue causing , not IntelliJ. Babel-ESLint - A wrapper around the Babel parser that makes it compatible with ESLint. are you using the airbnb eslint config and babel preset? Muhammad eslint can certainly parse it. Get Started with ESLint. json file in the root of your project, and add the following lines to have a basis ESLint configuration that works for React development, with JSX support:. 4 comes with upgrades: TypeScript 3. It bundle your assets (Scripts, CSS, images, etc. allowSuperOutsideMethod is set to true by default. Here we are telling eslint that we want to use babel to parse our javascript and then apply the standard linting rules and the recommended rules from the vue plugin. babel-traverse. If you are using Babel, you can use the babel-eslint parser and eslint-plugin-babel to use any option available in Babel. 3, along with the license associated …. I don`t get why I have to have so many configuration files in a project. This project was one of the hardest projects to work on: because it is just a compatibility. Babel compiler core. 20 removed ^ in all babel's on package. babelrc configuration file is present, or if the Babel configuration is specified in package. AST in ESLint. This is a smart move — leverage the features, community, and plugins of existing tools. So, ignore the babel related settings in eslint-plugin-flowtype. In this case, I'm using a number of ES6 language features like arrow functions, destructured variables, and such. The cache-loader allow to Caches the result of following loaders on disk (default) or in the database. 3 C:\Users\Olena\AppData\Roaming\npm\node_modules\eslint ├── [email protected] When dealing with locales you can run into the situation where a locale tag is not fully descriptive. espree, 基于esprima,用于eslint,Introducing Espree, an Esprima alternative; acorn,号称是相对于esprima性能更优, Acorn: yet another JavaScript parser; babylon,出自acorn,用于babel; babel-eslint,babel团队维护的,用于配合使用ESLint, GitHub - babel/babel-eslint: ESLint using Babel as the parser. babel-preset-stage-. This is the error: { parser: "babylon" } is deprecated; we now treat it as { parser: "babel" } It only seems to appear when building. typescript-eslint-parser(Experimental) - A parser that converts TypeScript into an ESTree-compatible form so it can be used in ESLint. e babel-core, babel-loader, babel-register, babel-node,babel-cli etc all plugins same version [email protected] Antes de que uses un parser customizado, considera si la complejidad agregada vale la pena. 7 - Updated 21 days ago - 3 stars @digest/jest-react. 如果用了ES6的新语法那么需要下载一个模块支持,否则react中写定义箭头函数会报错. The project is mainly developed at the Center for Applied Scientific Computing (CASC) at Lawrence Livermore National Laboratory (LLNL). I also included eslint for good measure. And since we would be using ES modules, we set the source type to that. npm install -g gulp (여기서 -g는 글로벌을 의미함) [BABEL 설치] npm install --save-dev gulp gulp-babel babel-core babel-loader. parser 使用 babel-eslint。 其實也可以不指定並採用預設的 ESLint parser,因為目前內建的 parser 已經支援 ES6 以後的語法;不過因為如 decorator 等只有 Babel 支援的語法仍舊需要使用 babel-eslint 進行解析,本專案就不採用內建 parser. (I've read all the webstorm docs on this but stil not quite sure about one fo the params ("Program")). npm install babel-eslint eslint-plugin-flowtype --global. If you are using previous versions of ESLint, you have to install babel-eslint, typescript-eslint-parser, or eslint-plugin-typescript because ESLint 4. 1 ├── path-is-absolute. BABEL: ES6 문법을 ES5문법으로 변환시켜 주는 툴. Comment attachment. This helps ESLint understand Typescript language. For people unfamiliar with Jest, it is a JavaScript testing framework which comes in with a lot of built-in capabilities such as mocking, assertion, snapshot testing etc. We use babel, eslint and AST's power them. The following are code examples for showing how to use babel. Zakas in June 2013. Its goal is to provide a pluggable linting utility for JavaScript. For example, the above states that when the "KWFORM Name" token pattern is matched, then the C# code $$ = new Form($2, $4); is run. eslintrc config file. npm install babel-eslint eslint-plugin-flowtype --save-dev Then run:. Discover Tips. Using babel-eslint as the parser fixed it. eslintrc加上配置. Once a project gets a bit more complex, a build step might consist of multiple sub tasks. Here's my configuration. Talk by Kent C. Getting Started. $ cnpm install babel-preset-stage-. Now that the application uses ECMAScript 6 features, you need to compile it using Babel. The Babel parser (previously Babylon) is a JavaScript parser used in Babel. We have collection of more than 1 Million open source products ranging from Enterprise product to small libraries in all platforms. If we missed you, we’re sorry but we’re grateful and we appreciate all the help people collectively put in!. eslintrc with Babel parser support (via babel-eslint package) -. For production, do not use babel-node, you'll want to compile with Babel. babel-eslint is a parser that allows ESLint to run on source code that is transformed by Babel. The application we have built so far enables you to write JavaScript applications with Webpack and Babel. vue-eslint-parser. json文件中eslint的配置就可以了(以下是vue-cli的默认配置) "eslintConfig": { "root": true, ////此项是用来. Maintain your code quality with ease. ⤴️ Motivation. To use babel-eslint. Note : The recommended way of running webhint is as a devDependency of your project. We need it to tell Webpack to load. Hi Guys, We are trying to create a react POC with NPM, Webpack, ESLint, Bamboo & Babel Could you please let me know if there is any use case or blog. This article is part of the Tool Mastery Series, a compilation of Knowledge Base contributions to introduce diverse working examples for Designer Tools. Parser and Route -> a takes another of type a. js with the following content at the root of your project (where the package. We can make mistakes easily on if we use complex directives and expressions in the template. If you are curious about my project setup, you can read about how I setup TypeScript with Babel and my ESLint for TypeScript setup. This is a smart move — leverage the features, community, and plugins of existing tools. In the embedded Terminal (Alt+F12), type: npm install eslint babel-eslint --save-dev. npm install --save-dev babel-eslint. 'react/prop-types': 'warn', // NOTE (k1): The latest version of eslint-plugin-react catches a lot more, we cannot easily re-enable this without correcting the problem everywhere. jsで何か新しいもの作ろうとするたびに、色んなサイトを調べなおして環境を構築しています。 面倒なので、備忘録も兼ねて記事にしようかと。 フロントエンドで動作するプログラムを作ることを前提とします. To use babel-eslint. Looks like IntelliJ is able to support the syntax just fine. This seems to be a problem with the versions of Babel which have been released since I wrote the article (a whopping 3 days ago). The following parsers are compatible with ESLint: Esprima; Babel-ESLint - A wrapper around the Babel parser that makes it compatible with ESLint. [00:05:33] And the path is a special object that has a lot of context and a lot of utilities on it. json and I have a newer @babel/core version (7. eslint-loader - tells webpack that we are going to use eslint in our build babel-eslint - provides linting for ES6 code. We have collection of more than 1 Million open source products ranging from Enterprise product to small libraries in all platforms. The solution is to specify the parser to use in our ESLint configuration - babel-eslint. There is one tricky part where I spent couple of ours. The next part is a glob and tells the tool what to parse. Babel preset for stage 0 plugins. Same problem, but my case is about Yarn on Windows. ESLint - The fully pluggable JavaScript code quality tool. eslint-plugin-babel re-implements problematic rules so they do not give false positives or negatives. Here we are telling eslint that we want to use babel to parse our javascript and then apply the standard linting rules and the recommended rules from the vue plugin. If there is an issue, first check if it can be reproduced with the regular parser. Babel-ESLint - A wrapper around the Babel parser that makes it compatible with ESLint. Never update dependencies in package. eslintrc with Babel parser support (via babel-eslint package) -. Extension:Babel. (I've read all the webstorm docs on this but stil not quite sure about one fo the params ("Program")). However there is a caveat. I use eslint to lint ES2015 + React projects. 5 has been released with the ability to parse and transpile F# and similar pipelines. It has builtin support for date formatting with timezone support as well as a very simple and friendly interface to gettext translations. It then compiles these into a gettext POT formatted file as a template for translation. Third, it's written by none other than Nicholas Zakas. The fix that worked for me was installing the babel-eslint package (npm install babel-eslint --save-dev or yarn add babel-eslint -D). babel-eslint does a great job at adapting eslint for use with Babel, but it can't change the built in rules to support experimental features. Total amount contributed. You can vote up the examples you like or vote down the ones you don't like. ex6に変更することで読み込まれるようになりました。 ローカルでコンパイルし直して本番環境にデプロイすることでHerokuでも無事反映されました。. babel-eslint is a parser that allows ESLint to run on source code that is transformed by Babel. Sometimes you might see a lot of ESLint rule violations on your command line or in your IDE/editor. Then we set the ECMA version to 2018 since we would be using the latest ES features in our code. Includes Parser and Rules. `@babel/preset-env` is a smart preset that allows you to use the latest JavaScript without needing to micromanage which syntax transforms (and optionally, browser polyfills) are needed by your target environment(s). About this release New features for Splunk Industrial Asset Intelligence Fixed issues for Splunk. Plugins Frameworks and Libraries. jsで何か新しいもの作ろうとするたびに、色んなサイトを調べなおして環境を構築しています。 面倒なので、備忘録も兼ねて記事にしようかと。 フロントエンドで動作するプログラムを作ることを前提とします. If you are using previous versions of ESLint, you have to install babel-eslint, typescript-eslint-parser, or eslint-plugin-typescript because ESLint 4. An object containing the options to be passed down to the babel parser, babylon: babel-eslint; documentation; spm-webpack. First install babel-eslint:. It has builtin support for date formatting with timezone support as well as a very simple and friendly interface to gettext translations. One problem I encounter with eslint is that it does not support the spread operator. The configuration file will be resolved starting from the location of the file being formatted, and searching up the file tree until a config file is (or isn't) found. I'm guessing that second half is still missing (but I'd love to be proven wrong). js不相容新的js語法的方法,他可以把新語法compile 成相同功能的舊語法,讓舊瀏覽器也可以讀懂. However there is a caveat. With the working Webpack app, it is a good time to use some of the nicer ES6 features and update the code. Airbnb's base JS ESLint config, following. 20 removed ^ in all babel's on package. The Babel extension adds a parser function to replace the old Babel system that completely relied on templates. This is usually ok, because the general advice is to compile your library code to vanilla JS before publishing (and thus strip type annotations), but there are packages that could still enable the. The goal is to allow TypeScript files to be parsed by ESLint. Otherwise try the default parser (you don't have to use it just because you are using Babel). babel-eslint is a parser for eslint that teaches the linter about experimental features that aren’t in ES6. babel-eslint. eslintrc config file. io/ 一個解決舊版瀏覽器或node. Setting up React for ES6 with Webpack and Babel ReactJS has been taking the world of front end development by storm. Babel 在每个文件都插入了辅助代码,使代码体积过大! Babel 对一些公共方法使用了非常小的辅助代码,比如 _extend。默认情况下会被添加到每一个需要它的文件中. Just add the following to your nuxt. Otherwise, you'd only log the output to your terminal. @babel/preset-env is a smart preset that allows you to use the latest JavaScript without needing to micromanage which syntax transforms (and optionally, browser polyfills) are needed by your target environment(s). It sounds a lot worse than it is. @wordpress/babel-plugin-makepot Edit. (In the upcoming 1. The configuration file will be resolved starting from the location of the file being formatted, and searching up the file tree until a config file is (or isn't) found. parser 使用 babel-eslint。 其實也可以不指定並採用預設的 ESLint parser,因為目前內建的 parser 已經支援 ES6 以後的語法;不過因為如 decorator 等只有 Babel 支援的語法仍舊需要使用 babel-eslint 進行解析,本專案就不採用內建 parser. This is the main reason just-task was made. We need it to tell Webpack to load. Getting Started. Babel compiler core. ts(x) in ESLint, we use as separate parser, typescript-eslint-parser. json manually. In the embedded Terminal (Alt+F12), type: npm install eslint babel-eslint --save-dev. Discover open source libraries, modules and frameworks you can use in your code Babel preset for all React plugins. Sign in to view. [00:07:03] But now we've added a new experimental feature that eslint would choke on, so we have to say, use Babel to understand this code. The goal is to allow TypeScript files to be parsed by ESLint. ts 파일로 보내야합니다. 28 | 3 minutes read. eslint-loader - tells webpack that we are going to use eslint in our build babel-eslint - provides linting for ES6 code. An object containing the options to be passed down to the babel parser, babylon: babel-eslint; documentation; spm-webpack. To begin, you'll need to install cache-loader:. After configure, you can do: msgfmt po/ast. Babel node is tool which is run the script file. 20 removed ^ in all babel's on package. The configuration can be set up using a. If you are curious about my project setup, you can read about how I setup TypeScript with Babel and my ESLint for TypeScript setup. Unexpected token errors are caused by incompatibilities in your parser options and the code you're writing. webpack is a module bundler. "Babel is the most accurate implementation of ES2015 in a compiler today, and while the transpiling portion of Babel cannot possibly conform 100 percent, that's the exact goal of the parser. { parser: "babel-eslint", "rules": { } } 现在应该可以启动app了,但是没有任何错误显示,不要高兴的太早,这只是因为我们还没有添加任何检测规则。 ESLint规则. 如果你使用eslint本身不支持的特性,可以使用 babel-eslint。否则可以使用默认解析器而不需要使用babel-eslint。 If there is an issue, first check if it can be reproduced with the regular parser or with the latest versions of eslint and babel-eslint! 如果有问题,先检查是否可以用常规解析器. 有看到说使用parser: "babel-eslint",但是尝试后好像并没有效果。 问题出现的平台版本及自己尝试过哪些方法 安装的eslint版本:. This is a standalone version of the syntax given with vscode-flowtype. A Babel preset that compiles ES2015+ down to ES5 by automatically determining the Babel plugins and polyfills you need based on your targeted browser or runtime environments. As its former name 6to5 suggests, Babel takes JavaScript. Create a file called babel. The parser just breaks the text into AST nodes, which then need to be processed somehow. (In the upcoming 1. eslintrc で typescript-eslint-parser を指定しても先に babel-eslint が参照されてしまうようでうまく ESLint が動作しなかった(これが仕様なのかどうかはちゃんとに調べていない…)。. However there is a caveat. Digested ESLint Babel configurations Latest release 2. vue-eslint-parser. eslintrc file. babel-eslint allows you to lint ALL valid Babel code with the fantastic ESLint. Here we are telling eslint that we want to use babel to parse our javascript and then apply the standard linting rules and the recommended rules from the vue plugin. pkg:[package-name] User packages @[username]. 使用Babel,ESLint #Babel. Because, babel-jest uses Babel, we need…. I'm guessing that second half is still missing (but I'd love to be proven wrong). Silence is Golden. To add support in ESLint for Typescript, you need to add a custom parser to help it understand Typescript syntax. About this release New features for Splunk Industrial Asset Intelligence Fixed issues for Splunk. If you are using previous versions of ESLint, you have to install babel-eslint, typescript-eslint-parser, or eslint-plugin-typescript because ESLint 4. Otherwise, you'd only log the output to your terminal. npm install --save-dev cache-loader. eslintrc file:.