how to stop composer from removing manually installed package - laravel

Question

For some reason I'm unable to install Predis package in my project via composer require predis/predis, I have manually downloaded Predis package from https://php-download.com and moved predis folder to the vendor and then updated files inside vendor/composer, it works fine.
However, the problem is when I run composer dump-autoload, this command removes all references of this package from vendor/composer/autoload_psr4.php and autoload_static.php files.
Can someone please help me how can I prevent composer dump-autoload to remove references of this package?

Answer 1

Instead of copying your package to the vendor directory, you can use "repositories" in install a local package:
{
"repositories": [
{
"type": "path",
"url": "../../packages/my-package"
}
],
"require": {
"my/package": "*"
}
}

Answer 2

I fixed it by adding following code in vendor/composer/installed.json , I forgot to add it.
{
"name": "predis/predis",
"version": "v1.1.1",
"version_normalized": "1.1.1.0",
"source": {
"type": "git",
"url": "https://github.com/nrk/predis.git",
"reference": "f0210e38881631afeafb56ab43405a92cafd9fd1"
},
"dist": {
"type": "zip",
"url": "https://api.github.com/repos/nrk/predis/zipball/f0210e38881631afeafb56ab43405a92cafd9fd1",
"reference": "f0210e38881631afeafb56ab43405a92cafd9fd1",
"shasum": ""
},
"require": {
"php": ">=5.3.9"
},
"require-dev": {
"phpunit/phpunit": "~4.8"
},
"suggest": {
"ext-curl": "Allows access to Webdis when paired with phpiredis",
"ext-phpiredis": "Allows faster serialization and deserialization of the Redis protocol"
},
"time": "2016-06-16T16:22:20+00:00",
"type": "library",
"installation-source": "dist",
"autoload": {
"psr-4": {
"Predis\\": "src/"
}
},
"notification-url": "https://packagist.org/downloads/",
"license": [
"MIT"
],
"authors": [
{
"name": "Daniele Alessandri",
"email": "suppakilla#gmail.com",
"homepage": "http://clorophilla.net"
}
],
"description": "Flexible and feature-complete Redis client for PHP and HHVM",
"homepage": "http://github.com/nrk/predis",
"keywords": [
"nosql",
"predis",
"redis"
]
}