diff --git a/assets/custom_ts/Utils.d.ts b/assets/custom_ts/Utils.d.ts
new file mode 100644
index 00000000..3fd12b36
--- /dev/null
+++ b/assets/custom_ts/Utils.d.ts
@@ -0,0 +1,35 @@
+/**
+ * Typescript typing rules for Utils
+ * 
+ * @author Pierre HUBERT
+ */
+
+declare interface CreateElem2Args {
+	type : string,
+	appendTo ?: HTMLElement,
+	insertBefore ?: HTMLElement,
+	insertAsFirstChild ?: HTMLElement,
+	class ?: string,
+	id ?: string,
+	title ?: string,
+	src ?: string,
+	href ?: string,
+	name ?: string,
+	elemType ?: string,
+	value ?: string,
+	placeholder ?: string,
+	innerHTML ?: string,
+	innerLang ?: string,
+	innerHTMLprefix ?: string,
+	disabled ?: boolean,
+}
+
+declare function createElem(nodeType : string, appendTo : string) : HTMLElement;
+
+declare function createElem2(infos : CreateElem2Args) : HTMLElement;
+
+declare function byId(id : string) : HTMLElement;
+
+declare function emptyElem(target : HTMLElement) : void;
+
+declare function checkMail(emailAddress : string) : boolean;
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