instant-search: Remove IE11 polyfill (#20998)

We don't transpile for IE11 anymore since #19328, meaning IE11 won't
run our JS anymore in the first place. So there's no point in keeping
the polyfill around.

projects/plugins/jetpack/changelog/remove-instant-search-ie11-polyfill

@@ -0,0 +1,4 @@
+Significance: patch
+Type: compat
+
+Instant Search: As IE11 support was removed in Jetpack 10.1, remove an IE11 polyfill.

projects/plugins/jetpack/modules/search/class-jetpack-instant-search.php

@@ -115,25 +115,12 @@ public function load_assets() {
 	 * @param string $plugin_base_path - Base path for use in plugins_url.
 	 */
 	public function load_assets_with_parameters( $path_prefix, $plugin_base_path ) {
-		$polyfill_relative_path = $path_prefix . '_inc/build/instant-search/jp-search-ie11-polyfill-loader.bundle.js';
-		$script_relative_path   = $path_prefix . '_inc/build/instant-search/jp-search-main.bundle.js';
+		$script_relative_path = $path_prefix . '_inc/build/instant-search/jp-search-main.bundle.js';
 
-		if (
-			! file_exists( JETPACK__PLUGIN_DIR . $polyfill_relative_path ) ||
-			! file_exists( JETPACK__PLUGIN_DIR . $script_relative_path )
-		) {
+		if ( ! file_exists( JETPACK__PLUGIN_DIR . $script_relative_path ) ) {
 			return;
 		}
 
-		$polyfill_version = Jetpack_Search_Helpers::get_asset_version( $polyfill_relative_path );
-		$polyfill_path    = plugins_url( $polyfill_relative_path, $plugin_base_path );
-		wp_enqueue_script( 'jetpack-instant-search-ie11', $polyfill_path, array(), $polyfill_version, true );
-		$polyfill_payload_path = plugins_url(
-			$path_prefix . '_inc/build/instant-search/jp-search-ie11-polyfill-payload.bundle.js',
-			$plugin_base_path
-		);
-		$this->inject_polyfill_js_options( $polyfill_payload_path );
-
 		$script_version = Jetpack_Search_Helpers::get_asset_version( $script_relative_path );
 		$script_path    = plugins_url( $script_relative_path, $plugin_base_path );
 		wp_enqueue_script( 'jetpack-instant-search', $script_path, array(), $script_version, true );
@@ -151,15 +138,6 @@ protected function inject_javascript_options() {
 		wp_add_inline_script( 'jetpack-instant-search', 'var JetpackInstantSearchOptions=JSON.parse(decodeURIComponent("' . rawurlencode( wp_json_encode( $options ) ) . '"));', 'before' );
 	}
 
-	/**
-	 * Passes options to the polyfill loader script.
-	 *
-	 * @param string $polyfill_payload_path - Absolute path to the IE11 polyfill payload.
-	 */
-	protected function inject_polyfill_js_options( $polyfill_payload_path ) {
-		wp_add_inline_script( 'jetpack-instant-search-ie11', 'var JetpackInstantSearchIe11PolyfillPath=decodeURIComponent("' . rawurlencode( $polyfill_payload_path ) . '");', 'before' );
-	}
-
 	/**
 	 * Registers a widget sidebar for Instant Search.
 	 */

projects/plugins/jetpack/package.json

@@ -86,7 +86,6 @@
 		"@wordpress/interface": "4.1.0",
 		"@wordpress/url": "3.2.2",
 		"@wordpress/viewport": "4.0.2",
-		"abortcontroller-polyfill": "1.7.1",
 		"bounding-client-rect": "1.0.5",
 		"classnames": "2.3.1",
 		"click-outside": "2.0.2",
@@ -149,8 +148,7 @@
 		"url-polyfill": "1.1.12",
 		"uuid": "8.3.2",
 		"webpack": "5.51.1",
-		"webpack-cli": "4.8.0",
-		"whatwg-fetch": "3.6.2"
+		"webpack-cli": "4.8.0"
 	},
 	"devDependencies": {
 		"@automattic/color-studio": "2.5.0",

projects/plugins/jetpack/tools/webpack.config.search.js

@@ -22,16 +22,6 @@ const baseWebpackConfig = getBaseWebpackConfig(
 	{
 		entry: {
 			main: path.join( __dirname, '../modules/search/instant-search/loader.js' ),
-			'ie11-polyfill-loader': path.join(
-				__dirname,
-				'../modules/search/instant-search/ie11-polyfill.js'
-			),
-			'ie11-polyfill-payload': [
-				require.resolve( 'core-js' ),
-				require.resolve( 'regenerator-runtime/runtime' ),
-				require.resolve( 'whatwg-fetch' ),
-				require.resolve( 'abortcontroller-polyfill/dist/polyfill-patch-fetch' ),
-			],
 		},
 		'output-chunk-filename': 'jp-search.chunk-[name]-[hash].min.js',
 		'output-filename': 'jp-search-[name].bundle.js',