Kunal Sachdev · Chris Wells
--- a/sveltejs/src/stores.js
+++ b/sveltejs/src/stores.js
 import { writable } from 'svelte/store';

 import {
-  DEFAULT_SOURCE_ID, SORT_OPTIONS,
+  DEFAULT_SOURCE_ID, SORT_OPTIONS, FILTERS,
 } from './constants';

+// Store the selected tab.
+const storedActiveTab = JSON.parse(sessionStorage.getItem('activeTab')) || DEFAULT_SOURCE_ID;
+let activeFilters = [];
+if (Object.keys(FILTERS).length > 0 && storedActiveTab in FILTERS) {
--- a/sveltejs/src/stores.js
+++ b/sveltejs/src/stores.js
 import { writable } from 'svelte/store';

 import {
-  DEFAULT_SOURCE_ID, SORT_OPTIONS,
+  DEFAULT_SOURCE_ID, SORT_OPTIONS, FILTERS,
 } from './constants';

+// Store the selected tab.
+const storedActiveTab = JSON.parse(sessionStorage.getItem('activeTab')) || DEFAULT_SOURCE_ID;
+let activeFilters = [];
+if (Object.keys(FILTERS).length > 0 && storedActiveTab in FILTERS) {
+  activeFilters = FILTERS[storedActiveTab];
+}
+export const sourceFilters = writable(activeFilters);
--- a/tests/src/FunctionalJavascript/ProjectBrowserUiTestJsonApi.php
+++ b/tests/src/FunctionalJavascript/ProjectBrowserUiTestJsonApi.php
    $this->assertEquals($results_before, $results_after);
  }

+  /**
+   * Tests filters are displayed if they are defined by source.
+   */
+  public function testFiltersShownIfDefinedBySource(): void {
+    $assert_session = $this->assertSession();
+    $this->config('project_browser.admin_settings')
+      ->set('enabled_sources', ['recipes'])
+      ->save();
+    $this->drupalGet('admin/modules/browse');
+
+    // Recipes doesn't define any filters so no filters are displayed.
+    $this->assertNULL($assert_session->waitForElementVisible('css', 'search__form-filters-container'));
-    $this->assertNULL($assert_session->waitForElementVisible('css', 'search__form-filters-container'));
+    $this->assertNull($assert_session->waitForElementVisible('css', 'search__form-filters-container'));
-    $this->assertNULL($assert_session->waitForElementVisible('css', 'search__form-filters-container'));
+    $this->assertNULL($assert_session->waitForElementVisible('css', '.search__form-filters-container'));
--- a/tests/src/FunctionalJavascript/ProjectBrowserUiTestJsonApi.php
+++ b/tests/src/FunctionalJavascript/ProjectBrowserUiTestJsonApi.php
+      ->set('enabled_sources', ['recipes'])
+      ->save();
+    $this->drupalGet('admin/modules/browse');
+
+    // Recipes doesn't define any filters so no filters are displayed.
+    $this->assertNULL($assert_session->waitForElementVisible('css', 'search__form-filters-container'));
+
+    // Enable module for extra source plugin.
+    $this->container->get('module_installer')->install(['project_browser_devel']);
+    $this->config('project_browser.admin_settings')->set('enabled_sources', ['drupalorg_mockapi'])->save(TRUE);
+
+    $this->drupalGet('admin/modules/browse');
+    // Drupal.org mockapi defines only two filters (actively maintained filter
+    // and security coverage filter).
+    // @see \Drupal\project_browser\Plugin\ProjectBrowserSource\MockDrupalDotOrg::getFilterDefinitions()
+    $this->assertTrue($assert_session->waitForText('Maintenance Status'));
--- a/tests/src/FunctionalJavascript/ProjectBrowserUiTestJsonApi.php
+++ b/tests/src/FunctionalJavascript/ProjectBrowserUiTestJsonApi.php
+    $this->container->get('module_installer')->install(['project_browser_devel']);
+    $this->config('project_browser.admin_settings')->set('enabled_sources', ['drupalorg_mockapi'])->save(TRUE);
+
+    $this->drupalGet('admin/modules/browse');
+    // Drupal.org mockapi defines only two filters (actively maintained filter
+    // and security coverage filter).
+    // @see \Drupal\project_browser\Plugin\ProjectBrowserSource\MockDrupalDotOrg::getFilterDefinitions()
+    $this->assertTrue($assert_session->waitForText('Maintenance Status'));
+    $assert_session->waitForElementVisible('css', self::MAINTENANCE_OPTION_SELECTOR);
+    $this->assertTrue($assert_session->waitForText('Security Advisory Coverage'));
+    $assert_session->waitForElementVisible('css', self::SECURITY_OPTION_SELECTOR);
+    // Make sure no other filters are displayed.
+    $this->assertFalse($assert_session->waitForText('Development Status'));
+    $this->assertNull($assert_session->waitForElementVisible('css', self::DEVELOPMENT_OPTION_SELECTOR));
+    $this->assertFalse($assert_session->waitForText('Filter by category'));
+    $this->assertNull($assert_session->waitForElementVisible('css', 'div.search__form-filters-container > div.search__form-filters > section > fieldset > div'));