--- a/crates/jrsonnet-stdlib/src/lib.rs
+++ b/crates/jrsonnet-stdlib/src/lib.rs
@@ -148,6 +148,7 @@
 		("substr", builtin_substr::INST),
 		("char", builtin_char::INST),
 		("strReplace", builtin_str_replace::INST),
+		("isEmpty", builtin_is_empty::INST),
 		("splitLimit", builtin_splitlimit::INST),
 		("asciiUpper", builtin_ascii_upper::INST),
 		("asciiLower", builtin_ascii_lower::INST),
--- a/crates/jrsonnet-stdlib/src/strings.rs
+++ b/crates/jrsonnet-stdlib/src/strings.rs
@@ -28,6 +28,11 @@
 }
 
 #[builtin]
+pub fn builtin_is_empty(str: String) -> bool {
+	str.is_empty()
+}
+
+#[builtin]
 pub fn builtin_splitlimit(str: IStr, c: IStr, maxsplits: Either![usize, M1]) -> ArrValue {
 	use Either2::*;
 	match maxsplits {