Protect safeStringify from TypeError (#311)

* updated CHANGELOG.md

* Protect safeStringify from TypeError, when state vars have types that
can not be stringified (like bigint).  This in turn protects getCurrentState(),
which failed when dealing with such state.

Also, updated the tests with a bigint to show the failure/test the fix.

Author: jshaughn

CHANGELOG.md

@@ -1,3 +1,5 @@
+#### 2.3.17 (2022-04-14)
+
 #### 2.3.16 (2022-02-15)
 
 #### 2.3.15 (2022-01-20)

component/advanced/ProductsList.jsx

@@ -7,6 +7,7 @@ class AProduct extends React.Component {
     this.state = {
       myName: props.name,
       orderCount: 0,
+      orderValue: 1234n,
     };
   }
 

src/utils.js

@@ -3,16 +3,21 @@
  */
 exports.safeStringify = (obj, indent = 2) => {
   let cache = [];
-  const retVal = JSON.stringify(
-    obj,
-    (key, value) =>
-      typeof value === 'object' && value !== null
-        ? cache.includes(value)
-          ? undefined // Duplicate reference found, discard key
-          : cache.push(value) && value // Store value in our collection
-        : value,
-    indent
-  );
+  let retVal = '';
+  try {
+    retVal = JSON.stringify(
+      obj,
+      (key, value) =>
+        typeof value === 'object' && value !== null
+          ? cache.includes(value)
+            ? undefined // Duplicate reference found, discard key
+            : cache.push(value) && value // Store value in our collection
+          : value,
+      indent
+    );
+  } catch (err) {
+    retVal = 'State can not be Stringified';
+  }
   cache = null;
   return retVal;
 };