add BigInt support in JavaScriptCodec

Author: gfx

src/JavaScriptCodec.ts

@@ -9,6 +9,7 @@ const enum JSData {
   Set,
   Date,
   RegExp,
+  BigInt,
 }
 
 export function encodeJavaScriptData(input: unknown): Uint8Array | null {
@@ -22,6 +23,8 @@ export function encodeJavaScriptData(input: unknown): Uint8Array | null {
     return encode([JSData.Date, input.getTime()]);
   } else if (input instanceof RegExp) {
     return encode([JSData.RegExp, [input.source, input.flags]]);
+  } else if (typeof input === "bigint") {
+    return encode([JSData.BigInt, input.toString()]);
   } else {
     return null;
   }
@@ -44,6 +47,9 @@ export function decodeJavaScriptData(data: Uint8Array) {
       const [pattern, flags] = source;
       return new RegExp(pattern, flags);
     }
+    case JSData.BigInt: {
+      return BigInt(source);
+    }
     default: {
       throw new Error(`Unknown data type: ${jsDataType}`);
     }

test/javascript-codec.test.ts

@@ -14,11 +14,12 @@ describe("JavaScriptCodec", () => {
         arr: [1, 2, 3],
         bool: true,
         nil: null,
-        // undef: undefined,
+        // undef: undefined, // not supported
         date: new Date("Thu, 28 Apr 2016 22:02:17 GMT"),
         map: new Map([["foo", 10], ["bar", 20]]),
         set: new Set([123, 456]),
         regexp: /foo\n/i,
+        bigint: typeof(BigInt) !== "undefined" ? BigInt(Number.MAX_SAFE_INTEGER) + BigInt(1) : null,
       };
       const encoded = encode(object, { extensionCodec: JavaScriptCodec });