PHP Fatal error: Uncaught TypeError: is_link(): Argument #1 ($filename) must be of type string

[kunalsahu-git]

ddev drush cr
PHP Fatal error: Uncaught TypeError: is_link(): Argument #1 ($filename) must be of type string, Drush\Config\Environment given in /var/www/html/vendor/webflo/drupal-finder/src/DrupalFinder.php:153
Stack trace:
#0 /var/www/html/vendor/webflo/drupal-finder/src/DrupalFinder.php(153): is_link(Object(Drush\Config\Environment))
#1 /var/www/html/vendor/webflo/drupal-finder/src/DrupalFinder.php(75): DrupalFinder\DrupalFinder->discoverRoots(Object(Drush\Config\Environment))
#2 /var/www/html/vendor/drush/drush/src/Preflight/Preflight.php(311): DrupalFinder\DrupalFinder->__construct(Object(Drush\Config\Environment))
#3 /var/www/html/vendor/drush/drush/src/Runtime/Runtime.php(58): Drush\Preflight\Preflight->preflight(Array)
#4 /var/www/html/vendor/drush/drush/src/Runtime/Runtime.php(40): Drush\Runtime\Runtime->doRun(Array, Object(Symfony\Component\Console\Output\ConsoleOutput))
#5 /var/www/html/vendor/drush/drush/drush.php(139): Drush\Runtime\Runtime->run(Array)
#6 /var/www/html/vendor/drush/drush/drush(4): require('/var/www/html/v...')
#7 /var/www/html/vendor/bin/drush(119): include('/var/www/html/v...')
#8 {main}
thrown in /var/www/html/vendor/webflo/drupal-finder/src/DrupalFinder.php on line 153

Fatal error: Uncaught TypeError: is_link(): Argument #1 ($filename) must be of type string, Drush\Config\Environment given in /var/www/html/vendor/webflo/drupal-finder/src/DrupalFinder.php:153
Stack trace:
#0 /var/www/html/vendor/webflo/drupal-finder/src/DrupalFinder.php(153): is_link(Object(Drush\Config\Environment))
#1 /var/www/html/vendor/webflo/drupal-finder/src/DrupalFinder.php(75): DrupalFinder\DrupalFinder->discoverRoots(Object(Drush\Config\Environment))
#2 /var/www/html/vendor/drush/drush/src/Preflight/Preflight.php(311): DrupalFinder\DrupalFinder->__construct(Object(Drush\Config\Environment))
#3 /var/www/html/vendor/drush/drush/src/Runtime/Runtime.php(58): Drush\Preflight\Preflight->preflight(Array)
#4 /var/www/html/vendor/drush/drush/src/Runtime/Runtime.php(40): Drush\Runtime\Runtime->doRun(Array, Object(Symfony\Component\Console\Output\ConsoleOutput))
#5 /var/www/html/vendor/drush/drush/drush.php(139): Drush\Runtime\Runtime->run(Array)
#6 /var/www/html/vendor/drush/drush/drush(4): require('/var/www/html/v...')
#7 /var/www/html/vendor/bin/drush(119): include('/var/www/html/v...')
#8 {main}
thrown in /var/www/html/vendor/webflo/drupal-finder/src/DrupalFinder.php on line 153

[kunalsahu-git]

`<?php

/**

• @file
• Contains \DrupalFinder\DrupalFinder.
  */
  namespace DrupalFinder;

/**

• @deprecated in drupal-finder:1.3.0 and is removed from drupal-finder:2.0.0.
• Use \DrupalFinder\DrupalFinderComposerRuntime instead.
  /
  class DrupalFinder
  {
  /*
  • Drupal root environment variable.
    */
    const ENV_DRUPAL_ROOT = 'DRUPAL_FINDER_DRUPAL_ROOT';

/**
 * Composer root environment variable.
 */
const ENV_COMPOSER_ROOT = 'DRUPAL_FINDER_COMPOSER_ROOT';

/**
 * Vendor directory environment variable.
 */
const ENV_VENDOR_DIR = 'DRUPAL_FINDER_VENDOR_DIR';

/**
 * Drupal web public directory.
 *
 * @var string
 */
private $drupalRoot;

/**
 * Drupal package composer directory.
 *
 * @var bool
 */
private $composerRoot;

/**
 * Composer vendor directory.
 *
 * @var string
 *
 * @see https://getcomposer.org/doc/06-config.md#vendor-dir
 */
private $vendorDir;

/**
 * Starting path.
 *
 * @var string
 */
private $start_path_string;

/**
 * Initialize finder.
 *
 * Optionally pass the starting path.
 *
 * @param string|null $start_path
 *   The path to begin the search from.
 *
 * @throws \Exception
 * @todo Make $start_path mandatory in v2.
 */
public function __construct($start_path_string = null) {
    // Initialize path variables to false, indicating their locations are
    // not yet known.
    $this->start_path_string = $start_path_string;
    $this->drupalRoot = false;
    $this->composerRoot = false;
    $this->vendorDir = false;

    // If a starting path was provided, attempt to locate and set path
    // variables.
    if (!empty($start_path)) {
        $this->discoverRoots($start_path);
    }
}

/**
 * Locate Drupal, Composer, and vendor directory paths.
 *
 * @param string $start_path
 *   The path to begin the search from.
 *
 * @return bool
 *   True if the Drupal root was identified, false otherwise.
 *
 * @throws \Exception
 *
 * @deprecated Will be removed in v2. Future usage should instantiate
 *   a new DrupalFinder object by passing the starting path to its
 *   constructor.
 */
public function locateRoot($start_path)
{
    $this->discoverRoots($start_path);
    return !empty($this->getDrupalRoot());
}

/**
 * Get the Drupal root.
 *
 * @return string|bool
 *   The path to the Drupal root, if it was discovered. False otherwise.
 */
public function getDrupalRoot()
{
    $environment_path = $this->getValidEnvironmentVariablePath(self::ENV_DRUPAL_ROOT);

    return !empty($environment_path) ? $environment_path : $this->drupalRoot;
}

/**
 * Get the Composer root.
 *
 * @return string|bool
 *   The path to the Composer root, if it was discovered. False otherwise.
 */
public function getComposerRoot()
{
    $environment_path = $this->getValidEnvironmentVariablePath(self::ENV_COMPOSER_ROOT);
    return !empty($environment_path) ? $environment_path : $this->composerRoot;
}

/**
 * Get the vendor path.
 *
 * @return string|bool
 *   The path to the vendor directory, if it was found. False otherwise.
 */
public function getVendorDir()
{
    $environment_path = $this->getValidEnvironmentVariablePath(self::ENV_VENDOR_DIR);
    return !empty($environment_path) ? $environment_path : $this->vendorDir;
}

/**
 * Discover all valid paths.
 *
 * @param $start_path
 *   The path to start the search from.
 *
 * @throws \Exception
 */
protected function discoverRoots($start_path) {
    // Since we are discovering, reset all path variables.
    $this->drupalRoot = false;
    $this->composerRoot = false;
    $this->vendorDir = false;

    foreach (array(true, false) as $follow_symlinks) {
        $path = $start_path;
        if ($follow_symlinks && is_string($path) && is_link((string) $path)) {
            $path = realpath($path);
        }

        // Check the start path.
        if ($this->findAndValidateRoots($path)) {
            return;
        } else {
            // Move up dir by dir and check each.
            while ($path = $this->shiftPathUp($path)) {
                if ($follow_symlinks && is_link($path)) {
                    $path = realpath($path);
                }
                if ($this->findAndValidateRoots($path)) {
                    return;
                }
            }
        }
    }
}

/**
 * Determine if a valid Drupal root exists.
 *
 * In addition, set any valid path properties if they are found.
 *
 * @param $path
 *   The starting path to search from.
 *
 * @return bool
 *   True if all roots were discovered and validated. False otherwise.
 */
protected function findAndValidateRoots($path)
{
    $pathString = $path;
    if (!empty($pathString) && is_dir($pathString) && file_exists($pathString . '/autoload.php') && file_exists($pathString . '/' . $this->getComposerFileName())) {
        // Additional check for the presence of core/composer.json to
        // grant it is not a Drupal 7 site with a base folder named "core".
        $candidate = 'core/includes/common.inc';
        if (file_exists($path . '/' . $candidate) && file_exists($path . '/core/core.services.yml')) {
            if (file_exists($path . '/core/misc/drupal.js') || file_exists($path . '/core/assets/js/drupal.js')) {
                $this->composerRoot = $path;
                $this->drupalRoot = $path;
                $this->vendorDir = $this->composerRoot . '/vendor';
            }
        }
    }
    if (!empty($path) && is_dir($path) && file_exists($path . '/' . $this->getComposerFileName())) {
        $json = json_decode(
            file_get_contents($path . '/' . $this->getComposerFileName()),
            true
        );

        if (is_null($json)) {
            throw new \Exception('Unable to decode ' . $path . '/' . $this->getComposerFileName());
        }

        if (is_array($json)) {
            if (isset($json['extra']['installer-paths']) && is_array($json['extra']['installer-paths'])) {
                foreach ($json['extra']['installer-paths'] as $install_path => $items) {
                    if (in_array('type:drupal-core', $items) ||
                        in_array('drupal/core', $items) ||
                        in_array('drupal/drupal', $items)) {
                        $this->composerRoot = $path;
                        // @todo: Remove this magic and detect the major version instead.
                        if (($install_path == 'core') || ((isset($json['name'])) && ($json['name'] == 'drupal/drupal'))) {
                            $install_path = '';
                        } elseif (substr($install_path, -5) == '/core') {
                            $install_path = substr($install_path, 0, -5);
                        }
                        $this->drupalRoot = rtrim($path . '/' . $install_path, '/');
                        $this->vendorDir = $this->composerRoot . '/vendor';
                    }
                }
            }
        }
    }
    if ($this->composerRoot && file_exists($this->composerRoot . '/' . $this->getComposerFileName())) {
        $json = json_decode(
            file_get_contents($path . '/' . $this->getComposerFileName()),
            true
        );
        if (is_array($json) && isset($json['config']['vendor-dir'])) {
            $this->vendorDir = $this->composerRoot . '/' . $json['config']['vendor-dir'];
        }
    }

    return $this->allPathsDiscovered();
}

/**
 * @return string
 */
protected function getComposerFileName()
{
    return trim(getenv('COMPOSER')) ?: 'composer.json';
}

/**
 * Helper function to quickly determine whether or not all paths were discovered.
 *
 * @return bool
 *   True if all paths have been discovered, false if one or more haven't been found.
 */
protected function allPathsDiscovered() {
    return !empty($this->drupalRoot) && !empty($this->composerRoot) && !empty($this->vendorDir);
}

/**
 * Helper function to quickly determine whether or not all paths are known.
 *
 * @return bool
 *   True if all paths are known, false if one or more paths are unknown.
 */
protected function allPathsKnown() {
    return !empty($this->getDrupalRoot()) && !empty($this->getComposerRoot()) && !empty($this->getVendorDir());
}

/**
 * Get path stored in environment variable.
 *
 * @param string $variable
 *   The name of the environment variable to retrieve the path from.
 *
 * @return false|string
 *   A path if it is valid. False otherwise.
 */
protected function getValidEnvironmentVariablePath($variable) {
    $path = getenv($variable);
    if (is_string($path) && is_dir($path)) {
        return $path;
    }
    return false;
}

/**
 * Returns parent directory.
 *
 * @param string
 *   Path to start from
 *
 * @return string|false
 *   Parent path of given path or false when $path is filesystem root
 */
private function shiftPathUp($path)
{
    $parent = dirname($path);

    return in_array($parent, ['.', $path]) ? false : $parent;
}

}
`

Changing the code to this lets it work.

[kunalsahu-git]

PR has been raised to fix this issue. #71