php - but these conflict with your requirements or minimum-stability

Question

I am creating my own slackbot. I decided to use project as a library to help me.

https://github.com/sagebind/slack-client/issues?utf8=%E2%9C%93&q=stability

Now I need to install it with composer.

So I used the command: composer require coderstephen/slack-client

...And I get the error:

 Problem 1
    - Installation request for coderstephen/slack-client ^0.3.0 -> satisfiable by coderstephen/slack-client[v0.3.0].
    - coderstephen/slack-client v0.3.0 requires devristo/phpws dev-master -> satisfiable by devristo/phpws[dev-master] but these conflict with your requirements or minimum-stability.

Ok - So then I decided to change my stability level to "dev" in my composer.lock:

"aliases": [],
    "minimum-stability": "dev",
    "stability-flags": {
        "devristo/phpws": 20
    },
    "prefer-stable": true,
    "prefer-lowest": false,
    "platform": {
        "php": ">=5.5"
    },
    "platform-dev": []

Now I'm running out of ideas on what to do. The README says to do this step in composer.json but, no such settings exist:

Please note that the current version has unstable dependencies.

In order to install those dependencies, you can set "minimum-stability" in your composer.json, and recommend that you set "prefer-stable":

My composer.json:

{
    "name": "coderstephen/slack-client",
    "keywords": ["slack", "api", "realtime"],
    "license": "MIT",
    "description": "A better Slack client, with RTM API support",
    "authors": [{
        "name": "Stephen Coakley",
        "email": "me@stephencoakley.com"
    }],
    "require": {
        "php": ">=5.5",
        "devristo/phpws": "dev-master",
        "evenement/evenement": "2.0.*",
        "guzzlehttp/guzzle": "~6.0",
        "react/event-loop": "^0.4.1",
        "react/promise": "^2.2"
    },
    "require-dev": {
        "phpunit/phpunit": "~4.6",
        "fzaninotto/faker": "~1.4",
        "apigen/apigen": "^4.1"
    },
    "autoload": {
        "psr-4": {
            "Slack\": "src"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Slack\Tests\": "tests"
        }
    }
}

Does anyone know some solutions I could try?

Answer 1

Add minimum-stability and prefer-stable to your composer.json (not composer.lock):

{
    "name": "coderstephen/slack-client",
    "keywords": ["slack", "api", "realtime"],
    "license": "MIT",
    "description": "A better Slack client, with RTM API support",
    "authors": [{
        "name": "Stephen Coakley",
        "email": "me@stephencoakley.com"
    }],
    "require": {
        "php": ">=5.5",
        "devristo/phpws": "dev-master",
        "evenement/evenement": "2.0.*",
        "guzzlehttp/guzzle": "~6.0",
        "react/event-loop": "^0.4.1",
        "react/promise": "^2.2"
    },
    "require-dev": {
        "phpunit/phpunit": "~4.6",
        "fzaninotto/faker": "~1.4",
        "apigen/apigen": "^4.1"
    },
    "autoload": {
        "psr-4": {
            "Slack": "src"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Slack\Tests": "tests"
        }
    },
    "minimum-stability": "dev",
    "prefer-stable": true
}