feat(utils): safe json stringify

src/utils/getBody/getBody.spec.ts

@@ -1,4 +1,3 @@
-/* eslint-disable @typescript-eslint/require-await */
 import { suite } from 'uvu';
 import * as assert from 'uvu/assert';
 
@@ -8,7 +7,7 @@ import { getBody } from './getBody';
 
 const clientSuite = suite('Safe JSON Stringify');
 
-clientSuite('should output object with formatted sql string', async () => {
+clientSuite('should output object with formatted sql string', () => {
   const result = getBody(query);
 
   assert.equal(result.length, 22);

src/utils/getBody/getBody.ts

@@ -1,3 +1,5 @@
+import { safeJsonStringify } from './safeJsonStringify';
+
 const { warn } = console;
 
 const LIB_ID = process.env.LIB_ID ?? 'ExtendedFetch';
@@ -10,7 +12,7 @@ export function getBody(query?: unknown) {
   let body = '{}';
 
   try {
-    body = JSON.stringify(query);
+    body = safeJsonStringify(query);
   } catch (error) {
     warn(`${LIB_ID}: Failed to parse query ${String(error)}`);
   }

src/utils/getBody/index.ts

@@ -1 +1,2 @@
 export { getBody } from './getBody';
+export { safeJsonStringify } from './safeJsonStringify';

src/utils/getBody/safeJsonStringify.ts

@@ -0,0 +1,35 @@
+import { is } from '../getType';
+
+function safeJsonStringifyReplacer(seen: WeakSet<object>) {
+	return function (_key: string | number, value: unknown) {
+		if (is.Object(value) && typeof value?.toJSON === 'function') {
+			value = value.toJSON();
+		}
+
+		if (!(value !== null && typeof value === 'object')) {
+			return value;
+		}
+
+		if (seen.has(value)) {
+			return '[Circular]';
+		}
+
+		seen.add(value);
+
+		const newValue = (Array.isArray(value) ? [] : {}) as unknown[] & Record<string, unknown>;
+
+		for (const [innerKey, innerValue] of Object.entries(value)) {
+			newValue[innerKey] = safeJsonStringifyReplacer(seen)(innerKey, innerValue);
+		}
+
+		seen.delete(value);
+
+		return newValue;
+	};
+}
+
+export function safeJsonStringify(data: unknown, space?: string | number) {
+	const seen = new WeakSet();
+
+	return JSON.stringify(data, safeJsonStringifyReplacer(seen), space);
+}

src/utils/index.ts

@@ -1,4 +1,4 @@
-export { getBody } from './getBody';
+export { getBody, safeJsonStringify } from './getBody';
 export { is } from './getType';
 export { deepMerge } from './deepMerge';
 export { applyHeaders } from './applyHeaders';