fix eslint config

offchain/esbuild.js

@@ -1,13 +1,13 @@
-import * as esbuild from "esbuild"
+import * as esbuild from "esbuild";
 
 esbuild.build({
-  entryPoints: [ './entry.js' ],
-  outfile: 'dist/index.js',
+  entryPoints: [ "./entry.js" ],
+  outfile: "dist/index.js",
   bundle: true,
-  platform: 'node',
-  format: 'esm',
+  platform: "node",
+  format: "esm",
   treeShaking: true,
-  logLevel: 'error',
+  logLevel: "error",
   minify: true,
-  packages: 'external',
-})
+  packages: "external",
+});

offchain/esbuild/bundle.js

@@ -2,7 +2,7 @@ import * as esbuild from "esbuild";
 import { buildOptions } from "./config.js";
 
 if (process.argv.length < 4) {
-  throw `usage: node bundle.js ENTRY_POINT OUTPUT_FILENAME`;
+  throw "usage: node bundle.js ENTRY_POINT OUTPUT_FILENAME";
 }
 
 esbuild.build(

offchain/esbuild/serve.js

@@ -4,7 +4,7 @@ import http from "node:http";
 import * as url from "url";
 
 if (process.argv.length < 6) {
-  throw `usage: node serve.js ENTRY_POINT OUTPUT_FILE SERVE_DIR PORT`;
+  throw "usage: node serve.js ENTRY_POINT OUTPUT_FILE SERVE_DIR PORT";
 }
 
 const ctx = await esbuild.context(

offchain/eslint.config.mjs

@@ -0,0 +1,23 @@
+import js from "@eslint/js";
+import globals from "globals";
+
+export default [
+  js.configs.recommended,
+  {
+    languageOptions: {
+      ecmaVersion: 'latest',
+      globals: {
+        ...globals.browser,
+        ...globals.commonjs,
+        ...globals.es2021,
+        ...globals.node,
+      }
+    },
+    rules: {
+      indent: ['error', 2],
+      'linebreak-style': ['error', 'unix'],
+      quotes: ['error', 'double'],
+      semi: ['error', 'always'],
+    },
+  },
+];

offchain/package.json

@@ -28,6 +28,7 @@
     "bip39": "^3.1.0",
     "blakejs": "1.2.1",
     "bufferutil": "4.0.5",
+    "globals": "^15.9.0",
     "isomorphic-ws": "^5.0.0",
     "puppeteer-core": "^15.3.2",
     "reconnecting-websocket": "4.4.0",