diff --git a/source/helpers.ts b/source/helpers.ts
index ac57a9e..a696aef 100644
--- a/source/helpers.ts
+++ b/source/helpers.ts
@@ -150,11 +150,13 @@ namespace _ivaldi
         {
             "declaration": declaration = false,
             "libs": libs = [],
+            "head": head = "tsc"
         }
         :
         {
             declaration ?: boolean;
             libs ?: Array<string>;
+            head ?: string;
         }
         =
         {
@@ -162,8 +164,9 @@ namespace _ivaldi
     ) : string
     {
         return lib_plankton.string.coin(
-            "tsc{{libs}} {{source_paths}} --outFile {{target_path}}{{declaration}}",
+            "{{head}}{{libs}} {{source_paths}} --outFile {{target_path}}{{declaration}}",
             {
+                "head": head,
                 "libs": (
                     libs
                     .map(
diff --git a/source/main.ts b/source/main.ts
index 3ea503e..efb64c3 100644
--- a/source/main.ts
+++ b/source/main.ts
@@ -218,6 +218,12 @@ namespace _ivaldi
 					??
 					"node"
 				),
+				"settings": {
+					"typescript": {
+						"command": (((data_raw["settings"] ?? {})["typescript"] ?? {})["command"] ?? "tsc"),
+						"libs": (((data_raw["settings"] ?? {})["typescript"] ?? {})["libs"] ?? ["es2020"]),
+					},
+				},
 				"directories": {
 					"lib": (
 						(data_raw["misc"] ?? {})["lib"]
@@ -250,13 +256,6 @@ namespace _ivaldi
 						lib_plankton.string.coin("/tmp/", {})
 					),
 				},
-				"commands": {
-					"typescript_compile": (
-						(data_raw["commands"] ?? {})["typescript_compile"]
-						??
-						"tsc"
-					),
-				},
 				"libs": (data_raw["libs"] ?? {}),
 				"core": data_raw["core"],
 				"apps": (
@@ -267,7 +266,7 @@ namespace _ivaldi
 								"sources": app_raw["sources"],
 								"additional_dependencies": (app_raw["additional_dependencies"] ?? []),
 								"destination": (app_raw["destination"] ?? "{{project}}-{{app}}"),
-								"shebang": (app_raw["shebang"] ?? null),
+								"head": (app_raw["head"] ?? null),
 								"executable": (app_raw["executable"] ?? false),
 							}
 						)
@@ -533,8 +532,9 @@ namespace _ivaldi
 														["$^"],
 														path_core_implementation,
 														{
-															"libs": ["es2020"],
 															"declaration": true,
+															"head": data.settings.typescript.command,
+															"libs": data.settings.typescript.libs,
 														}
 													),
 												]
@@ -610,10 +610,8 @@ namespace _ivaldi
 															["$^"],
 															"$@",
 															{
-																/**
-																 * @todo var
-																 */
-																"libs": ["es2020"],
+																"head": data.settings.typescript.command,
+																"libs": data.settings.typescript.libs,
 															}
 														),
 													]
@@ -638,7 +636,7 @@ namespace _ivaldi
 															[
 																_ivaldi.command_log(lib_plankton.string.coin("app:{{name}} | linking …", {"name": app.name})),
 																_ivaldi.command_mkdir("$(dir $@)"),
-																lib_plankton.string.coin("echo '{{head}}' > {{path}}", {"head": (app.shebang ?? ""), "path": path_result}),
+																lib_plankton.string.coin("echo '{{head}}' > {{path}}", {"head": (app.head ?? ""), "path": path_result}),
 																_ivaldi.command_cat(["$^"], "$@", {"append": true}),
 															]
 														)
diff --git a/source/types.ts b/source/types.ts
index 8903068..d34bf86 100644
--- a/source/types.ts
+++ b/source/types.ts
@@ -46,7 +46,7 @@ namespace _ivaldi
 		sources : Array<string>;
 		additional_dependencies : Array<string>;
 		destination : string;
-		shebang : (null | string);
+		head : (null | string);
 		executable : boolean;
 	};
 	
@@ -57,6 +57,12 @@ namespace _ivaldi
 		version : string;
 		name : string;
 		target : ("node" | "web");
+		settings : {
+			typescript : {
+				command : string;
+				libs : Array<string>;
+			};
+		};
 		directories : {
 			lib : string;
 			source : string;
@@ -65,9 +71,6 @@ namespace _ivaldi
 			build : string;
 			makefile : string;
 		};
-		commands : {
-			typescript_compile : string;
-		};
 		libs : {
 			plankton : (null | Array<string>);
 			node : (null | Array<string>);