diff --git a/lib/core/base/check.js b/lib/core/base/check.js
index 4f34a5a892..fa3e324c96 100644
--- a/lib/core/base/check.js
+++ b/lib/core/base/check.js
@@ -1,9 +1,13 @@
-/*global CheckResult,DqElement */
+/*global CheckResult,DqElement, metadataFunctionMap */
 
 function createExecutionContext(spec) {
 	/*eslint no-eval:0 */
 	'use strict';
 	if (typeof spec === 'string') {
+		if (metadataFunctionMap.has(spec)) {
+			return metadataFunctionMap.get(spec);
+		}
+
 		return new Function('return ' + spec + ';')();
 	}
 	return spec;
diff --git a/lib/core/base/metadata-function-map.js b/lib/core/base/metadata-function-map.js
new file mode 100644
index 0000000000..9d4efd2d6f
--- /dev/null
+++ b/lib/core/base/metadata-function-map.js
@@ -0,0 +1,9 @@
+/*eslint no-unused-vars:0*/
+// TODO: es-modules-checks
+// TODO: es-modules-rules
+// import all check evaluate and after functions, and all rule matches functions
+
+const metadataFunctionMap = new Map();
+
+// TODO: es-modules-core
+// export default metadataFunctionMap;