Merge pull request #56 from JesusTheHun/feature/support-bigint

Add support for BigInt

src/index.ts

@@ -161,6 +161,10 @@ export const replacer = function replacer(options: Options) {
         return value;
       }
 
+      if (typeof value === 'bigint') {
+        return `_bigint_${value.toString()}`;
+      }
+
       if (typeof value === 'string') {
         if (dateFormat.test(value)) {
           if (!options.allowDate) {
@@ -348,6 +352,10 @@ export const reviver = function reviver(options: Options) {
       return NaN;
     }
 
+    if (typeof value === 'string' && value.startsWith('_bigint_') && typeof BigInt === 'function') {
+      return BigInt(value.replace('_bigint_', ''));
+    }
+
     return value;
   };
 };

test/common/index.test.js

@@ -230,6 +230,16 @@ const tests = ({ stringify, parse }) => {
     expect(parsed).toMatchObject(data);
   });
 
+  test('check BigInt value', () => {
+    const data = { LotOfFruits: BigInt('123456789123456789123456789123456789') };
+
+    const stringified = stringify(data);
+    const parsed = parse(stringified);
+
+    expect(stringified).toEqual('{"LotOfFruits":"_bigint_123456789123456789123456789123456789"}');
+    expect(parsed).toMatchObject(data);
+  });
+
   test('check undefined value', () => {
     const data = { undefinedFruit: undefined };
 

tsconfig.json

@@ -1,7 +1,12 @@
 {
   "compilerOptions": {
     "target": "es5",
-    "lib": ["es2015", "es2017", "dom"],
+    "lib": [
+      "es2015",
+      "es2017",
+      "dom",
+      "es2020.bigint"
+    ],
     "module": "commonjs",
     "declaration": true,
     "removeComments": true,