Upgrade linting from semistandard to eslint with standard support

Migrating to eslint allows using the mainstream highly maintained linting
tool that will directly support linting, code style enforcement and
support of locating errors.

 * Directly supports integrating with Typescript for future proofing
 * Supports enabling semi colon enforcement via rules

Author: Stephen Lineker-Miller

.eslintrc.js

@@ -0,0 +1,18 @@
+module.exports = {
+  env: {
+    browser: true,
+    es2021: true,
+    node: true
+  },
+  extends: [
+    'standard'
+  ],
+  parserOptions: {
+    ecmaVersion: 12,
+    sourceType: 'module'
+  },
+  rules: {
+    semi: ['error', 'always']
+  },
+  ignorePatterns: ['dist', 'soljson.js']
+};

package.json

@@ -7,7 +7,8 @@
     "solcjs": "solcjs"
   },
   "scripts": {
-    "lint": "node ./node_modules/semistandard/bin/cmd.js",
+    "lint": "eslint .",
+    "lint:fix": "eslint --fix .",
     "updateBinary": "node downloadCurrentVersion.js && node verifyVersion.js",
     "prepublishOnly": "npm run updateBinary",
     "pretest": "npm run lint",
@@ -56,16 +57,15 @@
   },
   "devDependencies": {
     "coveralls": "^3.0.0",
+    "eslint": "^7.32.0",
+    "eslint-config-standard": "^16.0.3",
+    "eslint-plugin-import": "^2.25.3",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-promise": "^5.1.1",
     "nyc": "^14.1.0",
-    "semistandard": "^12.0.0",
     "tape": "^4.11.0",
     "tape-spawn": "^1.4.2"
   },
-  "semistandard": {
-    "ignore": [
-      "soljson.js"
-    ]
-  },
   "nyc": {
     "exclude": [
       "soljson.js"