## Set up your environment To productively get going with Deno you should set up your environment. This means setting up shell autocomplete, environmental variables and your editor or IDE of choice. ### Environmental variables There are several env vars that control how Deno behaves: `DENO_DIR` defaults to `$HOME/.cache/deno` but can be set to any path to control where generated and cached source code is written and read to. `NO_COLOR` will turn off color output if set. See https://no-color.org/. User code can test if `NO_COLOR` was set without having `--allow-env` by using the boolean constant `Deno.noColor`. ### Shell autocomplete You can generate completion script for your shell using the `deno completions ` command. The command outputs to stdout so you should redirect it to an appropriate file. The supported shells are: - zsh - bash - fish - powershell - elvish Example (bash): ```shell deno completions bash > /usr/local/etc/bash_completion.d/deno.bash source /usr/local/etc/bash_completion.d/deno.bash ``` Example (zsh without framework): ```shell mkdir ~/.zsh # create a folder to save your completions. it can be anywhere deno completions zsh > ~/.zsh/_deno ``` then add this to your `.zshrc` ```shell fpath=(~/.zsh $fpath) autoload -Uz compinit compinit -u ``` and restart your terminal. note that if completions are still not loading, you may need to run `rm ~/.zcompdump/` to remove previously generated completions and then `compinit` to generate them again. Example (zsh + oh-my-zsh) [recommended for zsh users] : ```shell mkdir ~/.oh-my-zsh/custom/plugins/deno deno completions zsh > ~/.oh-my-zsh/custom/plugins/deno/_deno ``` After this add deno plugin under plugins tag in `~/.zshrc` file. for tools like `antigen` path will be `~/.antigen/bundles/robbyrussell/oh-my-zsh/plugins` and command will be `antigen bundle deno` and so on. Example (Powershell): ```shell deno completions powershell >> $profile .$profile ``` This will be create a Powershell profile at `$HOME\Documents\WindowsPowerShell\Microsoft.PowerShell_profile.ps1` by default, and it will be run whenever you launch the PowerShell. ### Editors and IDEs Because Deno requires the use of file extensions for module imports and allows http imports, and most editors and language servers do not natively support this at the moment, many editors will throw errors about being unable to find files or imports having unnecessary file extensions. The community has developed extensions for some editors to solve these issues: #### VS Code The beta version of [vscode_deno](https://github.com/denoland/vscode_deno) is published on the [Visual Studio Marketplace](https://marketplace.visualstudio.com/items?itemName=denoland.vscode-deno). Please report any issues. #### JetBrains IDEs Support for JetBrains IDEs is available through [the Deno plugin](https://plugins.jetbrains.com/plugin/14382-deno). Once installed, replace the content of `External Libraries > Deno Library > lib > lib.deno.d.ts` with the output of `deno types`. This will ensure the typings for the extension match the current version. You will have to do this every time you update the version of Deno. For more information on how to set-up your JetBrains IDE for Deno, read [this comment](https://youtrack.jetbrains.com/issue/WEB-41607#focus=streamItem-27-4160152.0-0) on YouTrack. #### Vim and NeoVim Vim works fairly well for Deno/TypeScript if you install [CoC](https://github.com/neoclide/coc.nvim) (intellisense engine and language server protocol) or [ALE](https://github.com/dense-analysis/ale) (syntax checker and language server protocol client). ##### CoC After CoC is installed, from inside Vim, run`:CocInstall coc-tsserver` and `:CocInstall coc-deno`. Run `:CocCommand deno.initializeWorkspace` in your project to initialize workspace configurations. From now on, things like `gd` (go to definition) and `gr` (goto/find references) should work. ##### ALE ALE integrates with Deno's LSP out of the box and should not require any extra configuration. However, if your Deno executable is not located in `$PATH`, has a different name than `deno` or you want to use unstable features/APIs, you need to override ALE's default values. See [`:help ale-typescript`](https://github.com/dense-analysis/ale/blob/master/doc/ale-typescript.txt). ALE provides support for autocompletion, refactoring, going to definition, finding references and more, however, key bindings need to be configured manually. Copy the snippet below into your `vimrc`/`init.vim` for basic configuration or consult the [official documentation](https://github.com/dense-analysis/ale#table-of-contents) for a more in-depth look at how to configure ALE. ALE can fix linter issues by running `deno fmt`. To instruct ALE to use the Deno formatter the `ale_linter` setting needs to be set either on a per buffer basis (`let b:ale_linter = ['deno']`) or globally for all TypeScript files (`let g:ale_fixers={'typescript': ['deno']}`) ```vim " Use ALE autocompletion with Vim's 'omnifunc' setting (press in insert mode) autocmd FileType typescript set omnifunc=ale#completion#OmniFunc " Make sure to use map instead of noremap when using a (...) expression as the {rhs} nmap gr (ale_rename) nmap gR (ale_find_reference) nmap gd (ale_go_to_definition) nmap gD (ale_go_to_type_definition) let g:ale_fixers = {'typescript': ['deno']} let g:ale_fix_on_save = 1 " run deno fmt when saving a buffer ``` #### Emacs Emacs works pretty well for a TypeScript project targeted to Deno by using a combination of [tide](https://github.com/ananthakumaran/tide) which is the canonical way of using TypeScript within Emacs and [typescript-deno-plugin](https://github.com/justjavac/typescript-deno-plugin) which is what is used by the [official VSCode extension for Deno](https://github.com/denoland/vscode_deno). To use it, first make sure that `tide` is setup for your instance of Emacs. Next, as instructed on the [typescript-deno-plugin](https://github.com/justjavac/typescript-deno-plugin) page, first `npm install --save-dev typescript-deno-plugin typescript` in your project (`npm init -y` as necessary), then add the following block to your `tsconfig.json` and you are off to the races! ```jsonc { "compilerOptions": { "plugins": [ { "name": "typescript-deno-plugin", "enable": true, // default is `true` "importmap": "import_map.json" } ] } } ``` #### LSP clients Deno has builtin support for the [Language server protocol](https://langserver.org) as of version 1.6.0 or later. If your editor supports the LSP, you can use Deno as a language server for TypeScript and JavaScript. The editor can start the server with `deno lsp`. ##### Example for Kakoune After installing the [`kak-lsp`](https://github.com/kak-lsp/kak-lsp) LSP client you can add the Deno language server by adding the following to your `kak-lsp.toml` ```toml [language.deno] filetypes = ["typescript", "javascript"] roots = [".git"] command = "deno" args = ["lsp"] ``` ##### Example for Vim/Neovim After installing the [`vim-lsp`](https://github.com/prabirshrestha/vim-lsp) LSP client you can add the Deno language server by adding the following to your `vimrc`/`init.vim`: ```vim if executable("deno") augroup LspTypeScript autocmd! autocmd User lsp_setup call lsp#register_server({ \ "name": "deno lsp", \ "cmd": {server_info -> ["deno", "lsp"]}, \ "root_uri": {server_info->lsp#utils#path_to_uri(lsp#utils#find_nearest_parent_file_directory(lsp#utils#get_buffer_path(), "tsconfig.json"))}, \ "allowlist": ["typescript", "typescript.tsx"], \ "initialization_options": { \ "enable": v:true, \ "lint": v:true, \ "unstable": v:true, \ }, \ }) augroup END endif ``` ##### Example for Sublime Text - Install the [Sublime LSP package](https://packagecontrol.io/packages/LSP) - Install the [TypeScript package](https://packagecontrol.io/packages/TypeScript) to get syntax highlighting - Add the following `.sublime-project` file to your project folder ```jsonc { "settings": { "LSP": { "deno": { "command": [ "deno", "lsp" ], "initializationOptions": { // "config": "", // Sets the path for the config file in your project "enable": true, // "importMap": "", // Sets the path for the import-map in your project "lint": true, "unstable": false }, "enabled": true, "languages": [ { "languageId": "javascript", "scopes": ["source.js"], "syntaxes": [ "Packages/Babel/JavaScript (Babel).sublime-syntax", "Packages/JavaScript/JavaScript.sublime-syntax" ] }, { "languageId": "javascriptreact", "scopes": ["source.jsx"], "syntaxes": [ "Packages/Babel/JavaScript (Babel).sublime-syntax", "Packages/JavaScript/JavaScript.sublime-syntax" ] }, { "languageId": "typescript", "scopes": ["source.ts"], "syntaxes": [ "Packages/TypeScript-TmLanguage/TypeScript.tmLanguage", "Packages/TypeScript Syntax/TypeScript.tmLanguage" ] }, { "languageId": "typescriptreact", "scopes": ["source.tsx"], "syntaxes": [ "Packages/TypeScript-TmLanguage/TypeScriptReact.tmLanguage", "Packages/TypeScript Syntax/TypeScriptReact.tmLanguage" ] } ] } } } } ``` If you don't see your favorite IDE on this list, maybe you can develop an extension. Our [community Discord group](https://discord.gg/deno) can give you some pointers on where to get started.