diff --git a/.gitignore b/.gitignore
index 51212ff..6fc64df 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 /node_modules
-lib
+/@types
 npm-debug.log
 .DS_Store
diff --git a/src/index.d.ts b/index.d.ts
similarity index 90%
rename from src/index.d.ts
rename to index.d.ts
index ceeb996..522d3ee 100644
--- a/src/index.d.ts
+++ b/index.d.ts
@@ -1,8 +1,9 @@
 import { Transform } from "readable-stream";
+
 import {Buffer} from "safe-buffer";
 
 export declare module 'encoding' {
-    export function convert(buf: Buffer, charset: string): Buffer;
+    export function convert(buf: Buffer, toCharset: string, fromCharset: string): Buffer;
 }
 
 export interface Compiler {
@@ -37,13 +38,13 @@ export interface parserOptions {
     validation?: boolean;
 }
 
-export interface PoParser {
+export interface po {
     parse: (buffer: Buffer | string, defaultCharset?: string) => GetTextTranslations;
     compile: (table: GetTextTranslations, options?: parserOptions) => Buffer;
     createParseStream: (options?: parserOptions, transformOptions?: import('readable-stream').TransformOptions) => Transform;
 }
 
-export interface MoParser {
+export interface mo {
     parse: (buffer: Buffer | string, defaultCharset?: string) => GetTextTranslations;
     compile: (table: GetTextTranslations, options?: parserOptions) => Buffer;
 }
diff --git a/src/index.js b/index.js
similarity index 59%
rename from src/index.js
rename to index.js
index d5deb01..99aafda 100644
--- a/src/index.js
+++ b/index.js
@@ -1,13 +1,13 @@
-import * as poParser from './poparser.js';
-import poCompiler from './pocompiler.js';
-import moParser from './moparser.js';
-import moCompiler from './mocompiler.js';
+import * as poParser from './lib/poparser.js';
+import poCompiler from './lib/pocompiler.js';
+import moParser from './lib/moparser.js';
+import moCompiler from './lib/mocompiler.js';
 
 /**
  * Translation parser and compiler for PO files
  * @see https://www.gnu.org/software/gettext/manual/html_node/PO.html
  *
- * @type {import("./index.js").PoParser} po
+ * @type {import("./index.d.ts").po} po
  */
 export const po = {
   parse: poParser.parse,
@@ -19,9 +19,9 @@ export const po = {
  * Translation parser and compiler for PO files
  * @see https://www.gnu.org/software/gettext/manual/html_node/MO.html
  *
- * @type {import("./index.js").MoParser} mo
+ * @type {import("./index.d.ts").mo} mo
  */
-export const mo= {
+export const mo = {
   parse: moParser,
   compile: moCompiler
 };
diff --git a/src/mocompiler.js b/lib/mocompiler.js
similarity index 91%
rename from src/mocompiler.js
rename to lib/mocompiler.js
index 98ee909..9e8747d 100644
--- a/src/mocompiler.js
+++ b/lib/mocompiler.js
@@ -1,13 +1,13 @@
 import { Buffer } from 'safe-buffer';
 import encoding from 'encoding';
-import { compareMsgid, formatCharset, generateHeader, HEADERS } from './shared.js';
+import { HEADERS, formatCharset, generateHeader, compareMsgid } from './shared.js';
 import contentType from 'content-type';
 
 /**
  * Exposes general compiler function. Takes a translation
  * object as a parameter and returns binary MO object
  *
- * @param {import('./index.js').gettextTranslations} table Translation object
+ * @param {import('./index.d.ts').GetTextTranslations} table Translation object
  * @return {Buffer} Compiled binary MO object
  */
 export default function (table) {
@@ -20,10 +20,10 @@ export default function (table) {
  * Creates a MO compiler object.
  *
  * @constructor
- * @param {import('./index.js').gettextTranslations} table Translation table as defined in the README
- * @return {import('./index.js').Compiler} Compiler
+ * @param {import('./index.d.ts').GetTextTranslations} table Translation table as defined in the README
+ * @return {import('./index.d.ts').Compiler} Compiler
  */
-function Compiler (table ) {
+function Compiler (table = {}) {
   this._table = table;
 
   let { headers = {}, translations = {} } = this._table;
@@ -71,8 +71,6 @@ function Compiler (table ) {
   this._writeFunc = 'writeUInt32LE';
 
   this._handleCharset();
-
-  return this;
 }
 
 /**
@@ -151,7 +149,7 @@ Compiler.prototype._generateList = function () {
 /**
  * Calculate buffer size for the final binary object
  *
- * @param {import('./index.js').GettextTranslations} list An array of translation strings from _generateList
+ * @param {import('./index.d.ts').GetTextTranslations} list An array of translation strings from _generateList
  * @return {Object} Size data of {msgid, msgstr, total}
  */
 Compiler.prototype._calculateSize = function (list) {
@@ -186,7 +184,7 @@ Compiler.prototype._calculateSize = function (list) {
 /**
  * Generates the binary MO object from the translation list
  *
- * @param {import('./index.js').GettextTranslations} list translation list
+ * @param {import('./index.d.ts').GetTextTranslations} list translation list
  * @param {Object} size Byte size information
  * @return {Buffer} Compiled MO object
  */
@@ -240,7 +238,7 @@ Compiler.prototype._build = function (list, size) {
 };
 
 /**
- * Compiles the translation object into a binary MO object
+ * Compiles translation object into a binary MO object
  *
  * @return {Buffer} Compiled MO object
  */
diff --git a/src/moparser.js b/lib/moparser.js
similarity index 100%
rename from src/moparser.js
rename to lib/moparser.js
diff --git a/src/pocompiler.js b/lib/pocompiler.js
similarity index 98%
rename from src/pocompiler.js
rename to lib/pocompiler.js
index 61a229f..dd15ef4 100644
--- a/src/pocompiler.js
+++ b/lib/pocompiler.js
@@ -1,6 +1,8 @@
-import { compareMsgid, foldLine, formatCharset, generateHeader, HEADERS } from './shared.js';
-import contentType from 'content-type';
+import { Buffer } from 'safe-buffer';
 import encoding from 'encoding';
+import { HEADERS, foldLine, compareMsgid, formatCharset, generateHeader } from './shared.js';
+import contentType from 'content-type';
+
 
 /**
  * Exposes general compiler function. Takes a translation
diff --git a/src/poparser.js b/lib/poparser.js
similarity index 100%
rename from src/poparser.js
rename to lib/poparser.js
diff --git a/src/shared.js b/lib/shared.js
similarity index 100%
rename from src/shared.js
rename to lib/shared.js
diff --git a/package.json b/package.json
index 08cadbe..90d8e11 100644
--- a/package.json
+++ b/package.json
@@ -17,24 +17,15 @@
   "engines": {
     "node": ">=18"
   },
-  "files": [
-    "lib",
-    "test",
-    "*.json",
-    "*.md",
-    "license.txt"
-  ],
   "scripts": {
-    "start": "tsc --watch",
-    "build": "tsc",
-    "lint": "eslint src/*.js test/*.js",
+    "lint": "eslint lib/*.js test/*.js index.js",
     "test-generate-mo": "msgfmt test/fixtures/latin13.po -o test/fixtures/latin13.mo & msgfmt test/fixtures/utf8.po -o test/fixtures/utf8.mo & msgfmt test/fixtures/obsolete.po -o test/fixtures/obsolete.mo",
     "test": "mocha",
     "preversion": "npm run lint && npm test",
-    "postversion": "git push && git push --tags"
+    "postversion": "git push && git push --tags",
+    "prepublish": "tsc && npm run lint && npm run test"
   },
-  "main": "./lib/index.js",
-  "types": "./lib/index.d.ts",
+  "main": "./index.js",
   "license": "MIT",
   "dependencies": {
     "content-type": "^1.0.5",
@@ -46,15 +37,16 @@
     "@types/chai": "latest",
     "@types/content-type": "^1.1.8",
     "@types/mocha": "latest",
+    "@types/readable-stream": "^4.0.11",
     "@typescript-eslint/eslint-plugin": "^6.18.1",
     "@typescript-eslint/parser": "^6.14.0",
-    "chai": "^5.1.0",
+    "chai": "^5.0.3",
     "eslint": "^8.56.0",
     "eslint-config-standard": "^17.1.0",
     "eslint-plugin-import": "^2.29.1",
     "eslint-plugin-n": "^16.6.2",
     "eslint-plugin-promise": "^6.1.1",
-    "mocha": "^10.4.0",
+    "mocha": "^10.3.0",
     "typescript": "^5.4.4"
   },
   "keywords": [
diff --git a/test/mo-compiler-test.js b/test/mo-compiler-test.js
index 6405d7a..4796425 100644
--- a/test/mo-compiler-test.js
+++ b/test/mo-compiler-test.js
@@ -1,7 +1,7 @@
 import * as chai from 'chai';
 import { promisify } from 'util';
 import path from 'path';
-import { mo } from '../src/index.js';
+import { mo } from '../index.js';
 import { readFile as fsReadFile } from 'fs';
 import { fileURLToPath } from 'url';
 
diff --git a/test/mo-parser-test.js b/test/mo-parser-test.js
index cf569dc..723368a 100644
--- a/test/mo-parser-test.js
+++ b/test/mo-parser-test.js
@@ -1,7 +1,7 @@
 import * as chai from 'chai';
 import { promisify } from 'util';
 import path from 'path';
-import { mo } from '../src/index.js';
+import { mo } from '../index.js';
 import { readFile as fsReadFile } from 'fs';
 import { fileURLToPath } from 'url';
 
diff --git a/test/module.mjs b/test/module.mjs
index b1b48b0..1796fd6 100644
--- a/test/module.mjs
+++ b/test/module.mjs
@@ -1,5 +1,5 @@
 import { expect } from 'chai';
-import { po, mo } from '../src/index.js';
+import { po, mo } from '../index.js';
 
 describe('esm module', () => {
   it('should allow named imports', () => {
diff --git a/test/po-compiler-test.js b/test/po-compiler-test.js
index 07000a9..18ad149 100644
--- a/test/po-compiler-test.js
+++ b/test/po-compiler-test.js
@@ -3,7 +3,7 @@ import { promisify } from 'util';
 import path from 'path';
 import { readFile as fsReadFile } from 'fs';
 import * as chai from 'chai';
-import { po } from '../src/index.js';
+import { po } from '../index.js';
 import { fileURLToPath } from 'url';
 
 const __filename = fileURLToPath(import.meta.url);
diff --git a/test/po-obsolete-test.js b/test/po-obsolete-test.js
index 10ec59d..f0e696f 100644
--- a/test/po-obsolete-test.js
+++ b/test/po-obsolete-test.js
@@ -3,7 +3,7 @@ import * as chai from 'chai';
 import { promisify } from 'util';
 import path from 'path';
 import fs from 'fs';
-import * as gettextParser from '../src/index.js';
+import * as gettextParser from '../index.js';
 import { fileURLToPath } from 'url';
 
 const __filename = fileURLToPath(import.meta.url);
diff --git a/test/po-parser-test.js b/test/po-parser-test.js
index 89b9e95..3a006c1 100644
--- a/test/po-parser-test.js
+++ b/test/po-parser-test.js
@@ -2,7 +2,7 @@ import * as chai from 'chai';
 import { promisify } from 'util';
 import path from 'path';
 import fs from 'fs';
-import * as gettextParser from '../src/index.js';
+import * as gettextParser from '../index.js';
 import { fileURLToPath } from 'url';
 
 const __filename = fileURLToPath(import.meta.url);
diff --git a/test/shared.js b/test/shared.js
index 7ca0a81..c40dfd6 100644
--- a/test/shared.js
+++ b/test/shared.js
@@ -3,7 +3,7 @@
 import * as chai from 'chai';
 import { promisify } from 'util';
 import path from 'path';
-import { formatCharset, parseHeader, generateHeader, foldLine, parseNPluralFromHeadersSafely } from '../src/shared.js';
+import { formatCharset, parseHeader, generateHeader, foldLine, parseNPluralFromHeadersSafely } from '../lib/shared.js';
 import { readFile as fsReadFile } from 'fs';
 import { fileURLToPath } from 'url';
 
diff --git a/tsconfig.json b/tsconfig.json
index 1b7d1bd..1564f0f 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,36 +2,35 @@
   "compilerOptions": {
     "noImplicitAny": true,
     "removeComments": false,
-    "module": "ESNext",
-    "moduleResolution": "Node",
-    "target": "ES2021",
-    "declaration": true,
-    "emitDeclarationOnly": false,
-    "preserveConstEnums": true,
-    "sourceMap": true,
-    "strict": false,
+    "module": "Node16",
+    "moduleResolution": "Node16",
+    "target": "ES2015",
+
+    // Strict mode
+    "strict": true,
+
+    // Allow javascript files
     "allowJs": true,
-    "downlevelIteration": true,
-    "esModuleInterop": true,
-    "skipLibCheck": true,
-    "allowSyntheticDefaultImports": true,
-    "experimentalDecorators": true,
-    "rootDir": "src",
-    "outDir": "lib",
+
+    // Check js files for errors
+    "checkJs": false,
+
+    // Output d.ts files to @types
+    "outDir": "@types",
+
+    // Generate d.ts files
+    "declaration": true,
+
+    // This compiler run should
+    // only output d.ts files
+    "emitDeclarationOnly": true,
     // Minify
     "pretty": false,
-    // types
-    "typeRoots": [
-      "src/types.d.ts",
-      "node_modules/@types",
-      "@types"
-    ],
-    "lib": [
-      "dom",
-      "ESNext"
-    ]
+    // Skip lib check when compiling
+    "skipLibCheck": true
   },
   "include": [
-    "./src/**/*"
+    "lib/**/*.js",
+    "index.d.ts"
   ]
 }