feat: make Reader a named export

BREAKING CHANGE: Reader class is no longer a default export:

```diff
- import Reader from 'mmdb-lib';
+ import { Reader } from 'mmdb-lib';

const reader = new Reader<CityResponse>(db);

```

Author: Dmitry Shirokov

.github/workflows/build.yml

@@ -26,3 +26,4 @@ jobs:
     - run: npm run lint
     - run: npm test
     - run: npm run build
+    - run: npm run test-imports

.gitignore

@@ -4,6 +4,6 @@ node_modules
 coverage
 npm-debug.log
 .nyc_output
-lib-*
+lib
 package-lock.json
 local

package.json

@@ -39,11 +39,9 @@
     "url": "http://github.com/runk/mmdb-lib/issues"
   },
   "files": [
-    "lib-commonjs",
-    "lib-esm"
+    "lib"
   ],
-  "main": "lib-commonjs/index.js",
-  "module": "lib-esm/index.js",
+  "main": "lib/index.js",
   "typings": "lib/index.d.ts",
   "engines": {
     "node": ">=10",
@@ -55,6 +53,7 @@
     "lint": "eslint . --ext .ts",
     "lint:types": "tsc --noEmit",
     "test": "jest",
+    "test-imports": "node test/imports/commonjs.js && node test/imports/esm.mjs",
     "format": "prettier --write src",
     "prepublish": "npm run build",
     "semantic-release": "semantic-release"

src/decoder.ts

@@ -325,8 +325,7 @@ export default class Decoder {
     const numberOfLongs = size / 4;
     for (let i = 0; i < numberOfLongs; i++) {
       integer =
-        integer * BigInt(4294967296) +
-        BigInt(buffer.readUInt32BE(i << 2));
+        integer * BigInt(4294967296) + BigInt(buffer.readUInt32BE(i << 2));
     }
 
     return integer.toString();

test.jsm

@@ -0,0 +1,10 @@
+const fs = require('fs');
+const assert = require('assert');
+
+const mmdb = require('../../lib/index.js');
+const db = fs.readFileSync('test/data/test-data/GeoIP2-City-Test.mmdb')
+
+const reader = new mmdb.Reader(db)
+const res = reader.get('175.16.199.255');
+assert.strictEqual(res.city.geoname_id, 2038180);
+console.log('commonjs: OK');

test/imports/commonjs.js

@@ -0,0 +1,9 @@
+import fs from 'fs';
+import assert from 'assert';
+import * as mmdb from '../../lib/index.js';
+const db = fs.readFileSync('test/data/test-data/GeoIP2-City-Test.mmdb')
+
+const reader = new mmdb.Reader(db)
+const res = reader.get('175.16.199.255');
+assert.strictEqual(res.city.geoname_id, 2038180);
+console.log('esm: OK');

test/imports/esm.mjs

@@ -3,7 +3,7 @@
     "lib": ["es2021"],
     "module": "commonjs",
     "target": "es2021",
-    "outDir": "lib-commonjs",
+    "outDir": "lib",
 
     "strict": true,
     "esModuleInterop": true,