Modernize tooling and tidy loose ends after the cleanup

CHANGELOG.md

@@ -1,5 +1,26 @@
 # CHANGELOG - sitespeed.io/plugin  (we use [semantic versioning](https://semver.org))
 
+## 1.0.1 - UNRELEASED
+### Fixed
+* Removed an unreachable `log()` wrapper method on the base class. The
+  constructor's `this.log` assignment had always shadowed it, so calling
+  `plugin.log(...)` invoked the logger object directly. Behavior is
+  unchanged; the dead method is gone.
+* Validate the constructor's `config` argument up front and throw a clear
+  error when `name`, `context` or `queue` is missing, instead of letting
+  a confusing `Cannot read properties of undefined` escape later.
+* Use `===` for the abstract-class guard.
+* Fixed a malformed `@param {}` JSDoc tag on `sendMessage`.
+* README with install, example and API reference.
+* `engines` field (`node >= 20`).
+* `test/plugin.test.js` covering the public surface (run with `npm test`,
+  uses the built-in `node:test` runner — no test deps).
+* GitHub Actions workflow that runs lint and tests on Node 20/22/24.
+* Bumped dev tooling: `eslint` 8 → 10, `prettier` 2 → 3,
+  `eslint-plugin-unicorn` 45 → 64, `eslint-config-prettier` 8 → 10,
+  `eslint-plugin-prettier` 4 → 5.
+* Migrated `.eslintrc.json` to flat config (`eslint.config.mjs`).
+
 ## 1.0.0 - 2025-01-06
 ### Breaking
 * Replaced the use of intel, instead use sitespeed.io/log.

eslint.config.mjs

@@ -0,0 +1,41 @@
+import js from '@eslint/js';
+import prettier from 'eslint-plugin-prettier';
+import prettierConfig from 'eslint-config-prettier';
+import unicorn from 'eslint-plugin-unicorn';
+import globals from 'globals';
+
+export default [
+  js.configs.recommended,
+  unicorn.configs.recommended,
+  prettierConfig,
+  {
+    plugins: {
+      prettier
+    },
+    languageOptions: {
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+      globals: {
+        ...globals.node
+      }
+    },
+    rules: {
+      'prettier/prettier': [
+        'error',
+        {
+          singleQuote: true,
+          trailingComma: 'none',
+          arrowParens: 'avoid',
+          embeddedLanguageFormatting: 'off'
+        }
+      ],
+      'require-atomic-updates': 0,
+      'no-extra-semi': 0,
+      'no-mixed-spaces-and-tabs': 0,
+      'unicorn/filename-case': 0,
+      'unicorn/prevent-abbreviations': 0,
+      'unicorn/no-array-reduce': 0,
+      'unicorn/prefer-spread': 0
+    }
+  }
+];