How can I run composer install --dev on Heroku?

How can I run composer install --dev on Heroku?

php heroku deployment composer-php

heroku

How to provide access to a git repository that is used by Composer

git heroku deployment ssh composer-php

heroku

Heroku doesn't recognize my Laravel app as PHP app, and does not do composer install

php heroku laravel-4 composer-php

heroku

Run Gulp tasks during composer install

php laravel heroku composer-php gulp

heroku

Heroku: composer.json in sub folder

php heroku composer-php

heroku

Laravel Spark - Cannot connect to repo

laravel github heroku composer-php laravel-spark

heroku

Extremely slow Composer\Autoload\includeFile shown in New Relic for Heroku app

php heroku composer-php newrelic

heroku

how do you change the php version that your app uses in heroku platform?

php heroku composer-php

heroku

How to install gettext extension for php on Heroku?

php heroku composer-php gettext

heroku

PHP Heroku - Call undefined function mb_detect_encoding()

php heroku composer-php

heroku

composer.json specifies dependency, but no composer.lock was found

git heroku composer-php sendgrid

heroku

Trying to run heroku locally and get a error 'vendor' is not a command

php heroku path composer-php vendor

heroku

The requested PHP extension ext-mysql * is missing from your system. in php 7.1.7

php mysql heroku composer-php

heroku

How to get Xdebug running on Heroku?

php heroku composer-php xdebug

heroku

Laravel 4: Running composer when deploying to Heroku

php deployment heroku laravel composer-php

heroku