added web vendorsHEADmaster

1 files changed, 10 insertions, 0 deletions

diff --git a/@linaria/packages/babel/src/utils/isBoxedPrimitive.ts b/@linaria/packages/babel/src/utils/isBoxedPrimitive.ts
new file mode 100644
index 0000000..2d20eec
--- /dev/null
+++ b/@linaria/packages/babel/src/utils/isBoxedPrimitive.ts
@@ -0,0 +1,10 @@
+// There is a problem with using boxed numbers and strings in TS,
+// so we cannot just use `instanceof` here
+
+const constructors = ['Number', 'String'];
+export default function isBoxedPrimitive(o: any): o is Number | String {
+  return (
+    constructors.includes(o.constructor.name) &&
+    typeof o?.valueOf() !== 'object'
+  );
+}