#Find in emacs code
Try making a small error in your React source code and you'll see a red squiggle and an error in the Errors List panel. The JavaScript language service included with Emacs has syntax error checking support by default, which you can see in action in the Errors List panel ( M-x lsp-treemacs-errors-list). Linters analyze your source code and can warn about potential problems before running your application. You can learn more in this Live edit and debug your React apps directly from Emacs(TO BE PORTED TO EMACS) blog post and the webpack Hot Module Replacement documentation(TO BE PORTED TO EMACS). If you are using webpack together with your React app, you can have a more efficient workflow by taking advantage of webpack's HMR mechanism which enables you to have live editing and debugging directly from Emacs. You can review it their README Live editing and debugging # The Debugger for Chrome extension README has lots of information on other configurations, working with sourcemaps, and troubleshooting. You can step through your source code using M-x dap-next, inspect variables such as element, and see the call stack of the client side React application. Refresh the page and you should hit your breakpoint. The source code where the breakpoint is set runs on startup before the debugger was attached, so we won't hit the breakpoint until we refresh the web page. Then type M-x dap-debug or use Debug -> Start menu. createElement ( 'h1', Įnsure that your development server is running ( npm start). Import React from 'react' import ReactDOM from 'react-dom' import './index.css' import App from './App' import reportWebVitals from './reportWebVitals' var element = React. Add the link to declare a new H1 header and replace the tag in ReactDOM.render with element.
#Find in emacs update
Let's update the sample application to "Hello World!". Note: Peek definition requires installing lsp-ui package which is not part of the default installation. Put the cursor over the App, right click and select Go to definition. Through the TypeScript language service, Emacs can also provide type definition information in the editor through Go to Definition ( M-.) or Peek Definition ( M-x lsp-ui-peek-find-definitions). If you select a method, you'll also get parameter help:
ATA pulls down the npm Type Declaration files ( *.d.ts) for the npm modules referenced in the package.json. , you see the types and methods on the object through IntelliSense.Įmacs uses the TypeScript language service for its JavaScript code intelligence and it has a feature called Automatic Type Acquisition (ATA). You'll notice that Emacs has syntax highlighting for the various source code elements and, if you put the cursor on a parenthesis, the matching bracket is also selected.Īs you start typing in index.js, you'll see smart suggestions or completions.Īfter you select a suggestion and type. Syntax highlighting and bracket matching # Installing the typescript language server #Įmacs supports automatic language server installation, so the first time you run M-x lsp in a JavaScript file opened in it, you will be prompted for a language server to install. Tip: For optimal experience use either Emacs 27.1 or gccemacs. xref-find-definition in js buffers, add the following to your config: "" ) t ) ( setq package-selected-packages ' ( lsp-mode yasnippet lsp-treemacs helm-lsp projectile hydra flycheck company avy which-key helm-xref dap-mode zenburn-theme json-mode )) ( when ( cl-find-if-not #' package-installed-p package-selected-packages ) ( package-refresh-contents ) ( mapc #' package-install package-selected-packages )) ( load-theme 'zenburn t ) ( helm-mode ) ( require 'helm-xref ) ( define-key global-map #' helm-find-files ) ( define-key global-map #' helm-M-x ) ( define-key global-map #' helm-mini ) ( which-key-mode ) ( add-hook 'prog-mode-hook #' lsp ) ( setq gc-cons-threshold ( * 100 1024 1024 ) read-process-output-max ( * 1024 1024 ) company-idle-delay 0.0 company-minimum-prefix-length 1 create-lockfiles nil ) lock files will kill `npm start' ( with-eval-after-load 'lsp-mode ( require 'dap-chrome ) ( add-hook 'lsp-mode-hook #' lsp-enable-which-key-integration ) ( yas-global-mode )) Tip: if you want to use M. ( package-initialize ) ( add-to-list 'package-archives ' ( "melpa".
Installing the typescript language server A guide on disabling/enabling lsp-mode features
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