use faster statement type check

Author: Steven Hargrove

lib/dependencies/HarmonyDetectionParserPlugin.js

@@ -13,9 +13,11 @@ module.exports = class HarmonyDetectionParserPlugin {
 			const isStrictHarmony = parser.state.module.type === "javascript/esm";
 			const isHarmony =
 				isStrictHarmony ||
-				ast.body.some(statement => {
-					return /^(Import|Export).*Declaration$/.test(statement.type);
-				});
+				ast.body.some(statement => statement =>
+					statement.type === "ImportDeclaration" ||
+					statement.type === "ExportDefaultDeclaration" ||
+					statement.type === "ExportNamedDeclaration"
+				);
 			if (isHarmony) {
 				const module = parser.state.module;
 				const compatDep = new HarmonyCompatibilityDependency(module);