feat: implement parser based on devalue (#1)

Reference: https://github.com/Rich-Harris/devalue#readme

.github/workflows/ci.yml

@@ -17,7 +17,6 @@ jobs:
     strategy:
       matrix:
         node-version:
-          - 12
           - 20
 
     steps:

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 dist/
 build/
+.idea/

Readme.md

@@ -1,20 +1,15 @@
 
 # socket.io-parser
 
-[![Build Status](https://github.com/socketio/socket.io-parser/workflows/CI/badge.svg)](https://github.com/socketio/socket.io-parser/actions)
-[![NPM version](https://badge.fury.io/js/socket.io-parser.svg)](http://badge.fury.io/js/socket.io-parser)
+[![Build Status](https://github.com/socketio/socket.io-devalue-parser/workflows/CI/badge.svg)](https://github.com/socketio/socket.io-devalue-parser/actions)
 
-A socket.io encoder and decoder written in JavaScript complying with version `5`
-of [socket.io-protocol](https://github.com/socketio/socket.io-protocol).
-Used by [socket.io](https://github.com/automattic/socket.io) and
-[socket.io-client](https://github.com/automattic/socket.io-client).
-
-Compatibility table:
-
-| Parser version | Socket.IO server version | Protocol revision |
-|----------------| ------------------------ | ----------------- |
-| 3.x            | 1.x / 2.x                | 4                 |
-| 4.x            | 3.x                      | 5                 |
+A fork of the default socket.io encoder and decoder, which uses
+[devalue](https://github.com/Rich-Harris/devalue) over the vanilla
+[JSON](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON) object,
+for stringifying and parsing JavaScript objects.
+This offers many improvements over the default parser, such as support for
+dates, maps, sets, regular expressions, `undefined`, custom classes and more.
+Check out [devalue](https://github.com/Rich-Harris/devalue) for details.
 
 
 ## Parser API
@@ -28,7 +23,7 @@ Compatibility table:
 ### Encoding and decoding a packet
 
 ```js
-var parser = require('socket.io-parser');
+var parser = require('socket.io-devalue-parser');
 var encoder = new parser.Encoder();
 var packet = {
   type: parser.EVENT,
@@ -52,7 +47,7 @@ encoder.encode(packet, function(encodedPackets) {
 ### Encoding and decoding a packet with binary data
 
 ```js
-var parser = require('socket.io-parser');
+var parser = require('socket.io-devalue-parser');
 var encoder = new parser.Encoder();
 var packet = {
   type: parser.BINARY_EVENT,
@@ -73,7 +68,7 @@ encoder.encode(packet, function(encodedPackets) {
   }
 });
 ```
-See the test suite for more examples of how socket.io-parser is used.
+See the test suite for more examples of how socket.io-devalue-parser is used.
 
 
 ## License

lib/index.ts

@@ -1,7 +1,8 @@
 import { Emitter } from "@socket.io/component-emitter";
 import { deconstructPacket, reconstructPacket } from "./binary.js";
-import { isBinary, hasBinary } from "./is-binary.js";
+import { hasBinary, isBinary } from "./is-binary.js";
 import debugModule from "debug"; // debug()
+import * as devalue from "devalue";
 
 const debug = debugModule("socket.io-parser"); // debug()
 
@@ -51,9 +52,10 @@ export class Encoder {
   /**
    * Encoder constructor
    *
-   * @param {function} replacer - custom replacer to pass down to JSON.parse
+   * @param {Object?} reducers - custom reducers to pass down to `devalue.stringify`
    */
-  constructor(private replacer?: (this: any, key: string, value: any) => any) {}
+  constructor(private reducers?: Record<string, (value: any) => any>) {}
+
   /**
    * Encode a packet as a single string if non-binary, or as a
    * buffer sequence, depending on packet type.
@@ -108,7 +110,7 @@ export class Encoder {
 
     // json data
     if (null != obj.data) {
-      str += JSON.stringify(obj.data, this.replacer);
+      str += devalue.stringify(obj.data, this.reducers);
     }
 
     debug("encoded %j as %s", obj, str);
@@ -146,9 +148,9 @@ export class Decoder extends Emitter<{}, {}, DecoderReservedEvents> {
   /**
    * Decoder constructor
    *
-   * @param {function} reviver - custom reviver to pass down to JSON.stringify
+   * @param {Object?} revivers - custom revivers to pass down to `devalue.parse`
    */
-  constructor(private reviver?: (this: any, key: string, value: any) => any) {
+  constructor(private revivers?: Record<string, (value: any) => any>) {
     super();
   }
 
@@ -157,7 +159,6 @@ export class Decoder extends Emitter<{}, {}, DecoderReservedEvents> {
    *
    * @param {String} obj - encoded packet
    */
-
   public add(obj: any) {
     let packet;
     if (typeof obj === "string") {
@@ -271,7 +272,7 @@ export class Decoder extends Emitter<{}, {}, DecoderReservedEvents> {
 
   private tryParse(str) {
     try {
-      return JSON.parse(str, this.reviver);
+      return devalue.parse(str, this.revivers);
     } catch (e) {
       return false;
     }