JavaScript code intelligence for atom with Tern. Adds support for ES5, ES6, ES7, Node.js, jQuery, Angular and more. Extendable via plugins. Uses suggestion provider by autocomplete-plus.

Configure your project

• Open any JavaScript file from within your project
• Navigate to Packages -> Atom Ternjs -> Configure project
• The config view appears.
• Hit "Save & Restart Server" to create/update the .tern-project file

Optional:

• install the package https://atom.io/packages/hyperclick

If configure project does not work

• In your project root create a file named .tern-project. See docs @ http://ternjs.net/doc/manual.html#configuration.
• Restart the server via Packages -> Atom Ternjs -> Restart server

Example .tern-project file (customize to your own needs):

{
  "ecmaVersion": 6,
  "libs": [
    "browser"
  ],
  "loadEagerly": [
    "path/to/your/js/**/*.js"
  ],
  "dontLoad": [
    "node_modules/**",
    "path/to/your/js/**/*.js"
  ],
  "plugins": {
    "es_modules": {},
    "node": {},
    "doc_comment": {
      "fullDocs": true,
      "strong": true
    }
  }
}

In order to use third party plugins read the Third party plugins section!

In order to use third party plugins from within your project's node_modules read the Third party plugins local section! This is also an alternative if Third party plugins aren't working.

• 5: use ECMAScript5
• 6: use ECMAScript6 (default)
• 7: use ECMAScript7

• browser: completion for vanilla js (optional)
• jquery: completion for jQuery (optional)
• underscore: completion for underscore (optional)
• chai: completion for chai (optional)

• loadEagerly: provide the path to your projects js. For relative paths do not use ./ as a prefix. This sometimes leads to an unexpected behaviour.
• loadEagerly is expensive. Do not add paths like node_modules.
• dontLoad: can be used to prevent Tern from loading certain files. It also takes an array of file names or glob patterns.

• For a list of build in server plugins, visit: http://ternjs.net/doc/manual.html#plugins

List of keybindings. To use your own keybindings goto atom-ternjs package settings and disable keybindings.

In order to use third party plugins (e.g. tern-node-express):

$ cd ~/.atom/packages/atom-ternjs
$ npm install tern-node-express

Add the plugin to your .tern-project file:

{
  "ecmaVersion": 6,
  "libs": [
    "browser"
  ],
  "loadEagerly": [
    "app/**/*.js"
  ],
  "plugins": {
    "node-express": {}
  }
}

Third party plugins are still an issue and sometimes do not work as expected, especially if the plugin requires a tern version that does not match the tern version that is used by atom-ternjs.

Restart the server: Packages -> Atom Ternjs -> Restart server

Example for node-express. Open node_modules/tern-node-express/tern-express.js

Replace:

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    return mod(require("tern/lib/infer"), require("tern/lib/tern"));
  if (typeof define == "function" && define.amd) // AMD
    return define([ "tern/lib/infer", "tern/lib/tern" ], mod);
  mod(tern, tern);
}...

With

(function(mod) {
  return mod(process.__infer, process.__tern);
}...

Restart Atom.

• After the file was created or has been modified, restart the server via Packages -> Atom Ternjs -> Restart server

• Completion (autocompletion triggers automatically), or via the keybindings:
  • ctrl+space
  • ctrl+alt+space (force autocompletion in any context)

• Find references (set your cursor position to one of variable, function or instance -> open context-menu and trigger "Find references" or use the keybindings:
  • ctrl+shift+r (macOS, Windows)
  • ctrl+alt+shift+e (Linux)

Click any item in the generated reference-list and navigate directly to file and position

• Documentation

  • Show documentation for the thing under the cursor via alt+o (macOS, Windows, Linux)
  • Also displayed if a suggestion with a valid documentation is selected in the autocomplete-plus select-list

• Find definition (set your cursor position to one of variable, function or instance -> open context-menu and trigger "Find definition") or use the keybindings:

  • cmd+click (macOS, Windows, Linux), requires https://atom.io/packages/hyperclick. Since cmd+click is also used for multi-line editing in macOS you should change the default hyperclick settings.
  • ctrl+alt+shift+d (macOS, Windows, Linux)

• Navigate back or forward

  • ctrl+shift+cmd+left (macOS, Windows, Linux)
  • ctrl+shift+cmd+right (macOS, Windows, Linux)

• Rename variable (set your cursor position to a variable -> open context-menu and trigger "Rename") or use the keybindings:

  • ctrl+alt+c (macOS, Windows)
  • ctrl+alt+shift+c (Linux)