fix: add missing strict mode directives (#180)

.eslintrc.js

@@ -1,3 +1,5 @@
+"use strict";
+
 module.exports = {
 	env: {
 		es2019: true,
@@ -34,6 +36,8 @@ module.exports = {
 	],
 	parserOptions: {
 		ecmaVersion: 2019,
+		// Explicitly tell ESLint to parse JavaScript as CommonJS, as airbnb-base sets this to "modules" for ECMAScript
+		sourceType: "script",
 	},
 	plugins: [
 		"import",
@@ -51,5 +55,6 @@ module.exports = {
 		"prefer-destructuring": ["error", { object: true, array: false }],
 		"promise/prefer-await-to-callbacks": "warn",
 		"promise/prefer-await-to-then": "warn",
+		strict: ["error", "global"],
 	},
 };

scripts/.eslintrc.js

@@ -1,3 +1,5 @@
+"use strict";
+
 module.exports = {
 	rules: {
 		"import/no-extraneous-dependencies": [

scripts/license-checker.js

@@ -1,5 +1,8 @@
 /* eslint-disable security/detect-object-injection */
 /* eslint-disable security-node/detect-crlf */
+
+"use strict";
+
 const checker = require("license-checker");
 const copyLeftLicenses = require("spdx-copyleft");
 const { promisify } = require("util");

src/index.js

@@ -1,3 +1,5 @@
+"use strict";
+
 const fp = require("fastify-plugin");
 /**
  * @author Frazer Smith

src/index.test.js

@@ -1,3 +1,5 @@
+"use strict";
+
 const Fastify = require("fastify");
 const plugin = require(".");