The built-in js-mode in Emacs does not provide many features for working with js framework beside js editing and syntax highlighting. The tips in this post will help you transform your Emacs into a powerful Javascript IDE.

Emacs support library for PDF files.

PDF Tools is, among other things, a replacement of DocView for PDF files. The key difference is, that pages are not pre-rendered by e.g. ghostscript and stored in the file-system, but rather created on-demand and stored in memory.

This rendering is performed by a special library named, for whatever reason, poppler, running inside a server program. This program is called epdfinfo and its job is it to successively read requests from Emacs and produce the proper results, i.e. the PNG image of a PDF page.

Actually, displaying PDF files is just one part of PDF Tools. Since poppler can provide us with all kinds of information about a document and is also able to modify it, there is a lot more we can do with it.

CharMap is unicode table viewer for Emacs. With CharMap you can see the unicode table based on The Unicode Standard 6.2.

;;; It is the opposite of fill-paragraph    
(defun unfill-paragraph ()
  "Takes a multi-line paragraph and makes it into a single line of text."
  (interactive)
  (let ((fill-column (point-max)))
    (fill-paragraph nil)))

And to bind it to a key:

;; Handy key definition
(define-key global-map "\M-Q" 'unfill-paragraph)

Very useful for stuff like whitespace-mode or auto-fill-mode:

(hook 'c-mode-hook (lambda () (xxxxxxxx-mode -1)))
(add-hook 'js-mode-hook (lambda () (xxxxxxxx-mode -1)))

A per-user emacs daemon service for systemd

Use the desktop library to save the state of Emacs from one session to another. Once you save the Emacs desktop—the buffers, their file names, major modes, buffer positions, and so on—then subsequent Emacs sessions reload the saved desktop. By default, the desktop also tries to save the frame and window configuration. To disable this, set desktop-restore-frames to nil. (See that variable’s documentation for some related options that you can customize to fine-tune this behavior.)

A dark theme for Atom, Alfred, Emacs, iTerm, Mintty, Slack, Sequel Pro, Sublime Text, Textmate, Terminal.app, Vim, Visual Studio Code, Xcode, and Zsh

If you are using Prelude you can just use C-c s (prelude-swap-windows). From the Prelude documentation:

C-c s runs the command crux-swap-windows (found in prelude-mode-map),
which is an alias for crux-transpose-windows in crux.el.

Flycheck is a modern on-the-fly syntax checking extension for GNU Emacs, intended as replacement for the older Flymake extension which is part of GNU Emacs. For a detailed comparison to Flymake see Flycheck versus Flymake.

It uses various syntax checking and linting tools to automatically check the contents of buffers while you type, and reports warnings and errors directly in the buffer, or in an optional error list.

Out of the box Flycheck supports over 40 different programming languages with more than 80 different syntax checking tools, and comes with a simple interface to define new syntax checkers.

Many 3rd party extensions provide new syntax checkers and other features like alternative error displays or mode line indicators.

Magit is an interface to the version control system Git, implemented as an Emacs package. Magit aspires to be a complete Git porcelain. While we cannot (yet) claim that Magit wraps and improves upon each and every Git command, it is complete enough to allow even experienced Git users to perform almost all of their daily version control tasks directly from within Emacs. While many fine Git clients exist, only Magit and Git itself deserve to be called porcelains.

web-beautify is a formatting package of HTML, CSS and JavaScript/JSON for Emacs. It uses the command-line/node.js javascript formatter from http://jsbeautifier.org/ to format whole html, css, js or json files, or region.

You absolutely need to try installing multiple cursors:

https://github.com/magnars/multiple-cursors.el

It's in marmalade and melpa so just:

<pre>
M-x package-install multiple-cursors
</pre>

This document describes a set of features that can interactively do things with buffers and files. All the features are described here in detail.

The Ido package can let you switch between buffers and visit files and directories with a minimum of keystrokes. It is a superset of Iswitchb, the interactive buffer switching package by Stephen Eglen.