init commit

1 files changed, 20 insertions, 0 deletions

diff --git a/shared/utils/src/is-pojo.ts b/shared/utils/src/is-pojo.ts
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index 0000000..4363454
--- /dev/null
+++ b/shared/utils/src/is-pojo.ts
@@ -0,0 +1,20 @@
+/**
+ * Determine if {@linkcode arg} is a Plain Old JavaScript Object.
+ *
+ * @see https://masteringjs.io/tutorials/fundamentals/pojo
+ *
+ * @param arg to test
+ * @returns true if {@linkcode arg} is a POJO
+ */
+export function isPOJO(arg: unknown): arg is Record<string, unknown> {
+    if (!arg || typeof arg !== 'object') {
+        return false;
+    }
+
+    const proto = Object.getPrototypeOf(arg);
+    if (!proto) {
+        return true; // `Object.create(null)`
+    }
+
+    return proto === Object.prototype;
+}