feat: socket.io support

index.js

@@ -5,15 +5,22 @@ const isValidNote = require("./note_validator");
 const fs = require("fs");
 const path = require("path");
 const cryptojs = require("crypto-js");
+const { Server } = require("socket.io");
 
 require("dotenv").config();
 
-const app = express();
+const app = express(),
+  server = require("http").createServer(app),
+  io = new Server().listen(server);
 
 if (!fs.existsSync("./notes")) {
   fs.mkdirSync("./notes");
 }
 
+setInterval(() => {
+  io.emit("foo", "bar");
+}, 1000);
+
 app.use(bodyParser.json());
 
 app.post("/publish", function (req, res) {
@@ -59,6 +66,6 @@ app.get("*", function (req, res) {
   res.sendFile(path.join(__dirname, "./dist", "index.html"));
 });
 
-app.listen(process.env.PORT, () => {
+server.listen(process.env.PORT, () => {
   console.log(`Listening on port ${process.env.PORT}`);
 });

package-lock.json

@@ -23,7 +23,9 @@
         "react-syntax-highlighter": "^15.5.0",
         "rehype-mathjax": "^4.0.2",
         "remark-gfm": "^3.0.1",
-        "remark-math": "^5.1.1"
+        "remark-math": "^5.1.1",
+        "socket.io": "^4.6.1",
+        "socket.io-client": "^4.6.1"
       },
       "devDependencies": {
         "@types/react": "^18.0.17",
@@ -591,6 +593,11 @@
         "node": ">=14"
       }
     },
+    "node_modules/@socket.io/component-emitter": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@socket.io/component-emitter/-/component-emitter-3.1.0.tgz",
+      "integrity": "sha512-+9jVqKhRSpsc591z5vX+X5Yyw+he/HCB4iQ/RYxw35CEPaY1gnsNE43nf9n9AaYjAQrTiI/mOwKUKdUs9vf7Xg=="
+    },
     "node_modules/@tootallnate/once": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-2.0.0.tgz",
@@ -599,6 +606,19 @@
         "node": ">= 10"
       }
     },
+    "node_modules/@types/cookie": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/@types/cookie/-/cookie-0.4.1.tgz",
+      "integrity": "sha512-XW/Aa8APYr6jSVVA1y/DEIZX0/GMKLEVekNG727R8cs56ahETkRAy/3DR7+fJyh7oUgGwNQaRfXCun0+KbWY7Q=="
+    },
+    "node_modules/@types/cors": {
+      "version": "2.8.13",
+      "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.13.tgz",
+      "integrity": "sha512-RG8AStHlUiV5ysZQKq97copd2UmVYw3/pRMLefISZ3S1hK104Cwm7iLQ3fTKx+lsUH2CE8FlLaYeEA2LSeqYUA==",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/debug": {
       "version": "4.1.7",
       "resolved": "https://registry.npmjs.org/@types/debug/-/debug-4.1.7.tgz",
@@ -638,6 +658,11 @@
       "resolved": "https://registry.npmjs.org/@types/ms/-/ms-0.7.31.tgz",
       "integrity": "sha512-iiUgKzV9AuaEkZqkOLDIvlQiL6ltuZd9tGcW3gwpnX8JbuiuhFlEGmmFXEXkN50Cvq7Os88IY2v0dkDqXYWVgA=="
     },
+    "node_modules/@types/node": {
+      "version": "18.15.11",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-18.15.11.tgz",
+      "integrity": "sha512-E5Kwq2n4SbMzQOn6wnmBjuK9ouqlURrcZDVfbo9ftDDTFt3nk7ZKK4GMOzoYgnpQJKcxwQw+lGaBvvlMo0qN/Q=="
+    },
     "node_modules/@types/prop-types": {
       "version": "15.7.5",
       "resolved": "https://registry.npmjs.org/@types/prop-types/-/prop-types-15.7.5.tgz",
@@ -863,6 +888,14 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/base64id": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
+      "integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog==",
+      "engines": {
+        "node": "^4.5.0 || >= 5.9"
+      }
+    },
     "node_modules/binary-extensions": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
@@ -1183,6 +1216,18 @@
       "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
       "integrity": "sha512-QADzlaHc8icV8I7vbaJXJwod9HWYp8uCqf1xa4OfNu1T7JVxQIrUgOWtHdNDtPiywmFbiS12VjotIXLrKM3orQ=="
     },
+    "node_modules/cors": {
+      "version": "2.8.5",
+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
+      "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
+      "dependencies": {
+        "object-assign": "^4",
+        "vary": "^1"
+      },
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
     "node_modules/crypto-js": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/crypto-js/-/crypto-js-4.1.1.tgz",
@@ -1406,6 +1451,94 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/engine.io": {
+      "version": "6.4.1",
+      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-6.4.1.tgz",
+      "integrity": "sha512-JFYQurD/nbsA5BSPmbaOSLa3tSVj8L6o4srSwXXY3NqE+gGUNmmPTbhn8tjzcCtSqhFgIeqef81ngny8JM25hw==",
+      "dependencies": {
+        "@types/cookie": "^0.4.1",
+        "@types/cors": "^2.8.12",
+        "@types/node": ">=10.0.0",
+        "accepts": "~1.3.4",
+        "base64id": "2.0.0",
+        "cookie": "~0.4.1",
+        "cors": "~2.8.5",
+        "debug": "~4.3.1",
+        "engine.io-parser": "~5.0.3",
+        "ws": "~8.11.0"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/engine.io-client": {
+      "version": "6.4.0",
+      "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-6.4.0.tgz",
+      "integrity": "sha512-GyKPDyoEha+XZ7iEqam49vz6auPnNJ9ZBfy89f+rMMas8AuiMWOZ9PVzu8xb9ZC6rafUqiGHSCfu22ih66E+1g==",
+      "dependencies": {
+        "@socket.io/component-emitter": "~3.1.0",
+        "debug": "~4.3.1",
+        "engine.io-parser": "~5.0.3",
+        "ws": "~8.11.0",
+        "xmlhttprequest-ssl": "~2.0.0"
+      }
+    },
+    "node_modules/engine.io-client/node_modules/ws": {
+      "version": "8.11.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.11.0.tgz",
+      "integrity": "sha512-HPG3wQd9sNQoT9xHyNCXoDUa+Xw/VevmY9FoHyQ+g+rrMn4j6FB4np7Z0OhdTgjx6MgQLK7jwSy1YecU1+4Asg==",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": "^5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/engine.io-parser": {
+      "version": "5.0.6",
+      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-5.0.6.tgz",
+      "integrity": "sha512-tjuoZDMAdEhVnSFleYPCtdL2GXwVTGtNjoeJd9IhIG3C1xs9uwxqRNEu5WpnDZCaozwVlK/nuQhpodhXSIMaxw==",
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/engine.io/node_modules/cookie": {
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.2.tgz",
+      "integrity": "sha512-aSWTXFzaKWkvHO1Ny/s+ePFpvKsPnjc551iI41v3ny/ow6tBG5Vd+FuqGNhh1LxOmVzOlGUriIlOaokOvhaStA==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/engine.io/node_modules/ws": {
+      "version": "8.11.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.11.0.tgz",
+      "integrity": "sha512-HPG3wQd9sNQoT9xHyNCXoDUa+Xw/VevmY9FoHyQ+g+rrMn4j6FB4np7Z0OhdTgjx6MgQLK7jwSy1YecU1+4Asg==",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": "^5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/esbuild": {
       "version": "0.15.11",
       "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.15.11.tgz",
@@ -4552,6 +4685,76 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/socket.io": {
+      "version": "4.6.1",
+      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-4.6.1.tgz",
+      "integrity": "sha512-KMcaAi4l/8+xEjkRICl6ak8ySoxsYG+gG6/XfRCPJPQ/haCRIJBTL4wIl8YCsmtaBovcAXGLOShyVWQ/FG8GZA==",
+      "dependencies": {
+        "accepts": "~1.3.4",
+        "base64id": "~2.0.0",
+        "debug": "~4.3.2",
+        "engine.io": "~6.4.1",
+        "socket.io-adapter": "~2.5.2",
+        "socket.io-parser": "~4.2.1"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/socket.io-adapter": {
+      "version": "2.5.2",
+      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-2.5.2.tgz",
+      "integrity": "sha512-87C3LO/NOMc+eMcpcxUBebGjkpMDkNBS9tf7KJqcDsmL936EChtVva71Dw2q4tQcuVC+hAUy4an2NO/sYXmwRA==",
+      "dependencies": {
+        "ws": "~8.11.0"
+      }
+    },
+    "node_modules/socket.io-adapter/node_modules/ws": {
+      "version": "8.11.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.11.0.tgz",
+      "integrity": "sha512-HPG3wQd9sNQoT9xHyNCXoDUa+Xw/VevmY9FoHyQ+g+rrMn4j6FB4np7Z0OhdTgjx6MgQLK7jwSy1YecU1+4Asg==",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": "^5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/socket.io-client": {
+      "version": "4.6.1",
+      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-4.6.1.tgz",
+      "integrity": "sha512-5UswCV6hpaRsNg5kkEHVcbBIXEYoVbMQaHJBXJCyEQ+CiFPV1NIOY0XOFWG4XR4GZcB8Kn6AsRs/9cy9TbqVMQ==",
+      "dependencies": {
+        "@socket.io/component-emitter": "~3.1.0",
+        "debug": "~4.3.2",
+        "engine.io-client": "~6.4.0",
+        "socket.io-parser": "~4.2.1"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/socket.io-parser": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.2.2.tgz",
+      "integrity": "sha512-DJtziuKypFkMMHCm2uIshOYC7QaylbtzQwiMYDuCKy3OPkjLzu4B2vAhTlqipRHHzrI0NJeBAizTK7X+6m1jVw==",
+      "dependencies": {
+        "@socket.io/component-emitter": "~3.1.0",
+        "debug": "~4.3.1"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
     "node_modules/source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -5193,6 +5396,14 @@
         "node": ">=0.1"
       }
     },
+    "node_modules/xmlhttprequest-ssl": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-2.0.0.tgz",
+      "integrity": "sha512-QKxVRxiRACQcVuQEYFsI1hhkrMlrXHPegbbd1yn9UHOmRxY+si12nQYzri3vbzt8VdTTRviqcKxcyllFas5z2A==",
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
@@ -5620,11 +5831,29 @@
       "resolved": "https://registry.npmjs.org/@remix-run/router/-/router-1.0.2.tgz",
       "integrity": "sha512-GRSOFhJzjGN+d4sKHTMSvNeUPoZiDHWmRnXfzaxrqe7dE/Nzlc8BiMSJdLDESZlndM7jIUrZ/F4yWqVYlI0rwQ=="
     },
+    "@socket.io/component-emitter": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@socket.io/component-emitter/-/component-emitter-3.1.0.tgz",
+      "integrity": "sha512-+9jVqKhRSpsc591z5vX+X5Yyw+he/HCB4iQ/RYxw35CEPaY1gnsNE43nf9n9AaYjAQrTiI/mOwKUKdUs9vf7Xg=="
+    },
     "@tootallnate/once": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-2.0.0.tgz",
       "integrity": "sha512-XCuKFP5PS55gnMVu3dty8KPatLqUoy/ZYzDzAGCQ8JNFCkLXzmI7vNHCR+XpbZaMWQK/vQubr7PkYq8g470J/A=="
     },
+    "@types/cookie": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/@types/cookie/-/cookie-0.4.1.tgz",
+      "integrity": "sha512-XW/Aa8APYr6jSVVA1y/DEIZX0/GMKLEVekNG727R8cs56ahETkRAy/3DR7+fJyh7oUgGwNQaRfXCun0+KbWY7Q=="
+    },
+    "@types/cors": {
+      "version": "2.8.13",
+      "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.13.tgz",
+      "integrity": "sha512-RG8AStHlUiV5ysZQKq97copd2UmVYw3/pRMLefISZ3S1hK104Cwm7iLQ3fTKx+lsUH2CE8FlLaYeEA2LSeqYUA==",
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@types/debug": {
       "version": "4.1.7",
       "resolved": "https://registry.npmjs.org/@types/debug/-/debug-4.1.7.tgz",
@@ -5664,6 +5893,11 @@
       "resolved": "https://registry.npmjs.org/@types/ms/-/ms-0.7.31.tgz",
       "integrity": "sha512-iiUgKzV9AuaEkZqkOLDIvlQiL6ltuZd9tGcW3gwpnX8JbuiuhFlEGmmFXEXkN50Cvq7Os88IY2v0dkDqXYWVgA=="
     },
+    "@types/node": {
+      "version": "18.15.11",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-18.15.11.tgz",
+      "integrity": "sha512-E5Kwq2n4SbMzQOn6wnmBjuK9ouqlURrcZDVfbo9ftDDTFt3nk7ZKK4GMOzoYgnpQJKcxwQw+lGaBvvlMo0qN/Q=="
+    },
     "@types/prop-types": {
       "version": "15.7.5",
       "resolved": "https://registry.npmjs.org/@types/prop-types/-/prop-types-15.7.5.tgz",
@@ -5835,6 +6069,11 @@
       "resolved": "https://registry.npmjs.org/bail/-/bail-2.0.2.tgz",
       "integrity": "sha512-0xO6mYd7JB2YesxDKplafRpsiOzPt9V02ddPCLbY1xYGPOX24NTyN50qnUxgCPcSoYMhKpAuBTjQoRZCAkUDRw=="
     },
+    "base64id": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
+      "integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog=="
+    },
     "binary-extensions": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
@@ -6055,6 +6294,15 @@
       "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
       "integrity": "sha512-QADzlaHc8icV8I7vbaJXJwod9HWYp8uCqf1xa4OfNu1T7JVxQIrUgOWtHdNDtPiywmFbiS12VjotIXLrKM3orQ=="
     },
+    "cors": {
+      "version": "2.8.5",
+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
+      "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
+      "requires": {
+        "object-assign": "^4",
+        "vary": "^1"
+      }
+    },
     "crypto-js": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/crypto-js/-/crypto-js-4.1.1.tgz",
@@ -6221,6 +6469,61 @@
       "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
       "integrity": "sha512-TPJXq8JqFaVYm2CWmPvnP2Iyo4ZSM7/QKcSmuMLDObfpH5fi7RUGmd/rTDf+rut/saiDiQEeVTNgAmJEdAOx0w=="
     },
+    "engine.io": {
+      "version": "6.4.1",
+      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-6.4.1.tgz",
+      "integrity": "sha512-JFYQurD/nbsA5BSPmbaOSLa3tSVj8L6o4srSwXXY3NqE+gGUNmmPTbhn8tjzcCtSqhFgIeqef81ngny8JM25hw==",
+      "requires": {
+        "@types/cookie": "^0.4.1",
+        "@types/cors": "^2.8.12",
+        "@types/node": ">=10.0.0",
+        "accepts": "~1.3.4",
+        "base64id": "2.0.0",
+        "cookie": "~0.4.1",
+        "cors": "~2.8.5",
+        "debug": "~4.3.1",
+        "engine.io-parser": "~5.0.3",
+        "ws": "~8.11.0"
+      },
+      "dependencies": {
+        "cookie": {
+          "version": "0.4.2",
+          "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.2.tgz",
+          "integrity": "sha512-aSWTXFzaKWkvHO1Ny/s+ePFpvKsPnjc551iI41v3ny/ow6tBG5Vd+FuqGNhh1LxOmVzOlGUriIlOaokOvhaStA=="
+        },
+        "ws": {
+          "version": "8.11.0",
+          "resolved": "https://registry.npmjs.org/ws/-/ws-8.11.0.tgz",
+          "integrity": "sha512-HPG3wQd9sNQoT9xHyNCXoDUa+Xw/VevmY9FoHyQ+g+rrMn4j6FB4np7Z0OhdTgjx6MgQLK7jwSy1YecU1+4Asg==",
+          "requires": {}
+        }
+      }
+    },
+    "engine.io-client": {
+      "version": "6.4.0",
+      "resolved": "https://registry.npmjs.org/engine.io-client/-/engine.io-client-6.4.0.tgz",
+      "integrity": "sha512-GyKPDyoEha+XZ7iEqam49vz6auPnNJ9ZBfy89f+rMMas8AuiMWOZ9PVzu8xb9ZC6rafUqiGHSCfu22ih66E+1g==",
+      "requires": {
+        "@socket.io/component-emitter": "~3.1.0",
+        "debug": "~4.3.1",
+        "engine.io-parser": "~5.0.3",
+        "ws": "~8.11.0",
+        "xmlhttprequest-ssl": "~2.0.0"
+      },
+      "dependencies": {
+        "ws": {
+          "version": "8.11.0",
+          "resolved": "https://registry.npmjs.org/ws/-/ws-8.11.0.tgz",
+          "integrity": "sha512-HPG3wQd9sNQoT9xHyNCXoDUa+Xw/VevmY9FoHyQ+g+rrMn4j6FB4np7Z0OhdTgjx6MgQLK7jwSy1YecU1+4Asg==",
+          "requires": {}
+        }
+      }
+    },
+    "engine.io-parser": {
+      "version": "5.0.6",
+      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-5.0.6.tgz",
+      "integrity": "sha512-tjuoZDMAdEhVnSFleYPCtdL2GXwVTGtNjoeJd9IhIG3C1xs9uwxqRNEu5WpnDZCaozwVlK/nuQhpodhXSIMaxw=="
+    },
     "esbuild": {
       "version": "0.15.11",
       "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.15.11.tgz",
@@ -8283,6 +8586,55 @@
         "object-inspect": "^1.9.0"
       }
     },
+    "socket.io": {
+      "version": "4.6.1",
+      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-4.6.1.tgz",
+      "integrity": "sha512-KMcaAi4l/8+xEjkRICl6ak8ySoxsYG+gG6/XfRCPJPQ/haCRIJBTL4wIl8YCsmtaBovcAXGLOShyVWQ/FG8GZA==",
+      "requires": {
+        "accepts": "~1.3.4",
+        "base64id": "~2.0.0",
+        "debug": "~4.3.2",
+        "engine.io": "~6.4.1",
+        "socket.io-adapter": "~2.5.2",
+        "socket.io-parser": "~4.2.1"
+      }
+    },
+    "socket.io-adapter": {
+      "version": "2.5.2",
+      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-2.5.2.tgz",
+      "integrity": "sha512-87C3LO/NOMc+eMcpcxUBebGjkpMDkNBS9tf7KJqcDsmL936EChtVva71Dw2q4tQcuVC+hAUy4an2NO/sYXmwRA==",
+      "requires": {
+        "ws": "~8.11.0"
+      },
+      "dependencies": {
+        "ws": {
+          "version": "8.11.0",
+          "resolved": "https://registry.npmjs.org/ws/-/ws-8.11.0.tgz",
+          "integrity": "sha512-HPG3wQd9sNQoT9xHyNCXoDUa+Xw/VevmY9FoHyQ+g+rrMn4j6FB4np7Z0OhdTgjx6MgQLK7jwSy1YecU1+4Asg==",
+          "requires": {}
+        }
+      }
+    },
+    "socket.io-client": {
+      "version": "4.6.1",
+      "resolved": "https://registry.npmjs.org/socket.io-client/-/socket.io-client-4.6.1.tgz",
+      "integrity": "sha512-5UswCV6hpaRsNg5kkEHVcbBIXEYoVbMQaHJBXJCyEQ+CiFPV1NIOY0XOFWG4XR4GZcB8Kn6AsRs/9cy9TbqVMQ==",
+      "requires": {
+        "@socket.io/component-emitter": "~3.1.0",
+        "debug": "~4.3.2",
+        "engine.io-client": "~6.4.0",
+        "socket.io-parser": "~4.2.1"
+      }
+    },
+    "socket.io-parser": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.2.2.tgz",
+      "integrity": "sha512-DJtziuKypFkMMHCm2uIshOYC7QaylbtzQwiMYDuCKy3OPkjLzu4B2vAhTlqipRHHzrI0NJeBAizTK7X+6m1jVw==",
+      "requires": {
+        "@socket.io/component-emitter": "~3.1.0",
+        "debug": "~4.3.1"
+      }
+    },
     "source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -8712,6 +9064,11 @@
       "resolved": "https://registry.npmjs.org/xmldom-sre/-/xmldom-sre-0.1.31.tgz",
       "integrity": "sha512-f9s+fUkX04BxQf+7mMWAp5zk61pciie+fFLC9hX9UVvCeJQfNHRHXpeo5MPcR0EUf57PYLdt+ZO4f3Ipk2oZUw=="
     },
+    "xmlhttprequest-ssl": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-2.0.0.tgz",
+      "integrity": "sha512-QKxVRxiRACQcVuQEYFsI1hhkrMlrXHPegbbd1yn9UHOmRxY+si12nQYzri3vbzt8VdTTRviqcKxcyllFas5z2A=="
+    },
     "xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",

package.json

@@ -26,7 +26,9 @@
     "react-syntax-highlighter": "^15.5.0",
     "rehype-mathjax": "^4.0.2",
     "remark-gfm": "^3.0.1",
-    "remark-math": "^5.1.1"
+    "remark-math": "^5.1.1",
+    "socket.io": "^4.6.1",
+    "socket.io-client": "^4.6.1"
   },
   "devDependencies": {
     "@types/react": "^18.0.17",

src/App.jsx

@@ -10,6 +10,7 @@ import PubNote from "./pages/pubNote";
 import PubError from "./pages/pubError";
 import PubNoteSafe from "./pages/pubNoteSafe";
 import RenderMarkdown from "./components/markdown";
+import { io } from "socket.io-client";
 
 function App() {
   Storage.prototype.setObj = function (key, obj) {
@@ -19,6 +20,24 @@ function App() {
     return JSON.parse(this.getItem(key)) || {};
   };
 
+  const socket = io();
+
+  function onConnect() {
+    console.log("connect");
+  }
+
+  function onDisconnect() {
+    console.log("disconnect");
+  }
+
+  function onFooEvent(value) {
+    console.log("foo event", value);
+  }
+
+  socket.on("connect", onConnect);
+  socket.on("disconnect", onDisconnect);
+  socket.on("foo", onFooEvent);
+
   return (
     <div className="grid grid-cols-4  lg:grid-cols-5  gap-10 text-black dark:text-white">
       <Menu />