falood/exsync

Yet another elixir reloader.

{
  "createdAt": "2014-11-03T05:03:17Z",
  "defaultBranch": "main",
  "description": "Yet another elixir reloader.",
  "fullName": "falood/exsync",
  "homepage": null,
  "language": "Elixir",
  "name": "exsync",
  "pushedAt": "2024-07-14T14:11:37Z",
  "stargazersCount": 171,
  "topics": [],
  "updatedAt": "2025-09-22T13:18:03Z",
  "url": "https://github.com/falood/exsync"
}

ExSync

An Elixir reloader. When your code changes, ExSync automatically recompiles it.

Supports recompiling :path dependencies without additional configuration. Also supports a :reload_callback which is an MFA (Module Function Arguments) that will be called after each time the code is recompiled.

System Support

ExSync depends on FileSystem which has some required dependencies.

Usage

Create a new application:

mix new my_app

Add exsync to your mix.exs dependencies:

def deps do
  [
    {:exsync, "~> 0.4", only: :dev},
  ]
end

NOTE: if you have an umbrella application then add ExSync to one the apps in the umbrella.

Config

All configuration for this library is handled via the application environment.

:addition_dirs - Additional directories to monitor

For example, to monitor the priv directory, add this to your config.exs:

config :exsync, addition_dirs: ["/priv"]

:extensions - List of file extensions to watch for changes. Defaults to: [".erl", ".hrl", ".ex", ".eex"]

:extra_extensions - List of additional extensions to watch for changes (cannot be used with :extensions)

For example, to watch .js and .css files add this to your config.exs:

config :exsync, extra_extensions: [".js", ".css"]

:exclusions - List of regular expressions that, if matched, exclude a file from being noticed by exsync.

For example, to exclude Emacs temporary files:

config :exsync, exclusions: [~r/#/]

:logging_enabled - Set to false to disable logging (default true)

:reload_callback - A callback MFA that is called when a set of files are done reloading. Can be used to implement your own special handling to react to file reloads.

:reload_timeout - Amount of time to wait in milliseconds before triggering the :reload_callback. Defaults to 150ms.

For example, to call MyApp.MyModule.handle_reload() add this to your config.exs:

config :exsync,
  reload_timeout: 75,
  reload_callback: {MyApp.MyModule, :handle_reload, []}