.

node_modules/next/dist/esm/lib/is-error.js

@@ -0,0 +1,56 @@
+import { isPlainObject } from '../shared/lib/is-plain-object';
+/**
+ * This is a safe stringify function that handles circular references.
+ * We're using a simpler version here to avoid introducing
+ * the dependency `safe-stable-stringify` into production bundle.
+ *
+ * This helper is used both in development and production.
+ */ function safeStringifyLite(obj) {
+    const seen = new WeakSet();
+    return JSON.stringify(obj, (_key, value)=>{
+        // If value is an object and already seen, replace with "[Circular]"
+        if (typeof value === 'object' && value !== null) {
+            if (seen.has(value)) {
+                return '[Circular]';
+            }
+            seen.add(value);
+        }
+        return value;
+    });
+}
+/**
+ * Checks whether the given value is a NextError.
+ * This can be used to print a more detailed error message with properties like `code` & `digest`.
+ */ export default function isError(err) {
+    return typeof err === 'object' && err !== null && 'name' in err && 'message' in err;
+}
+export function getProperError(err) {
+    if (isError(err)) {
+        return err;
+    }
+    if (process.env.NODE_ENV === 'development') {
+        // provide better error for case where `throw undefined`
+        // is called in development
+        if (typeof err === 'undefined') {
+            return Object.defineProperty(new Error('An undefined error was thrown, ' + 'see here for more info: https://nextjs.org/docs/messages/threw-undefined'), "__NEXT_ERROR_CODE", {
+                value: "E98",
+                enumerable: false,
+                configurable: true
+            });
+        }
+        if (err === null) {
+            return Object.defineProperty(new Error('A null error was thrown, ' + 'see here for more info: https://nextjs.org/docs/messages/threw-undefined'), "__NEXT_ERROR_CODE", {
+                value: "E336",
+                enumerable: false,
+                configurable: true
+            });
+        }
+    }
+    return Object.defineProperty(new Error(isPlainObject(err) ? safeStringifyLite(err) : err + ''), "__NEXT_ERROR_CODE", {
+        value: "E394",
+        enumerable: false,
+        configurable: true
+    });
+}
+
+//# sourceMappingURL=is-error.js.map