Use ESM syntax, and update deps to support it

.github/workflows/unittests.yml

@@ -2,25 +2,27 @@ name: Unit tests
 on:
   push:
     branches:
-    - main
+      - main
+      - master
   pull_request:
     branches:
-    - main
+      - main
+      - master
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]
+        node-version: [18.x, 20.x, 22.x]
     steps:
-    - uses: actions/checkout@v2
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
-      with:
-        node-version: ${{ matrix.node-version }}
-    - name: Install 
-      run: npm ci
-    - name: Verify lint
-      run: npm run lint
-    - name: Run unit tests
-      run: npm test
+      - uses: actions/checkout@v4
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Install
+        run: npm ci
+      - name: Verify lint
+        run: npm run lint
+      - name: Run unit tests
+        run: npm test

README.md

@@ -7,13 +7,13 @@ Normally you can check domain against the The Green Web Foundation url2green dat
 
 ```js
 
-const greencheck = require('@tgwf/hosting')
+import greencheck from "@tgwf/hosting"
 
 // returns true if green, otherwise false
-greencheck.check("google.com")
+await greencheck.check("google.com")
 
 // returns an array of the green domains, in this case ["google"].
-greencheck.check(["google.com", "kochindustries.com"])"]
+await  greencheck.check(["google.com", "kochindustries.com"])"]
 ```
 
 ## Usage
@@ -27,13 +27,13 @@ To do so, install this module with `npm install @tgwf/url2green`. You can then u
 
 ```js
 
-const hostingDB = require('@tgwf/hosting-database');
+import hostingDB from "@tgwf/hosting-database"
 
 // returns true if green, otherwise false
-hostingDB.check("google.com", "path/to/database.db");
+await hostingDB.check("google.com", "path/to/database.db");
 
 // returns an array of the green domains, in this case ["google.
-hostingDB.check(["google.com", "kochindustries.com"], "path/to/database.db");
+await hostingDB.check(["google.com", "kochindustries.com"], "path/to/database.db");
 ```
 
 ## Fetching the latest copy of the url2green dataset
@@ -44,9 +44,9 @@ You can generate a simple JSON list of the domains to check against, with `dumpD
 
 
 ```js
-const hostingDB = require('@tgwf/hosting-database');
+import hostingDB from "@tgwf/hosting-database"
 
-hostingDB.dumpDomains("path/to/database.db", "path/to/output.json");
+await hostingDB.dumpDomains("path/to/database.db", "path/to/output.json");
 ```
 
 In cases where you don't want to rely on SQLite, this will generate a JSON file that allows you to perform the same lookups, using the `@tgwf/co2` module.

eslint.config.js

@@ -0,0 +1,40 @@
+import prettier from "eslint-plugin-prettier";
+import jest from "eslint-plugin-jest";
+import globals from "globals";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import js from "@eslint/js";
+import { FlatCompat } from "@eslint/eslintrc";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+});
+
+export default [
+  ...compat.extends("eslint:recommended"),
+  {
+    plugins: {
+      prettier,
+      jest,
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...jest.environments.globals.globals,
+      },
+
+      ecmaVersion: 2020,
+    },
+
+    rules: {
+      "prettier/prettier": ["error", { trailingComma: "all" }],
+      "no-unused-vars": "off",
+    },
+  },
+];