diff --git a/.prettierrc b/.prettierrc
deleted file mode 100644
index 24a23ac..0000000
--- a/.prettierrc
+++ /dev/null
@@ -1,15 +0,0 @@
-{
-	"arrowParens": "avoid",
-	"jsxBracketSameLine": true,
-	"printWidth": 200,
-	"trailingComma": "none",
-	"useTabs": true,
-	"overrides": [
-		{
-			"files": ["*.md"],
-			"options": {
-				"useTabs": false
-			}
-		}
-	]
-}
diff --git a/LICENSE b/LICENSE
index 9323688..e421060 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2015-2017 Daniele Ricci
+Copyright (c) 2015-2020 Daniele Ricci
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index 290a584..25e63f3 100644
--- a/README.md
+++ b/README.md
@@ -3,11 +3,12 @@
 [![Build Status][travis-badge]][travis-url]
 [![Code Climate][code-badge]][code-url]
 [![Test Coverage][cover-badge]][code-url]
+[![Donate][donate-badge]][donate-url]
 
 [![NPM version][npm-badge]][npm-url]
 [![NPM downloads][npm-downloads-badge]][npm-url]
+[![Stars][stars-badge]][github-url]
 [![Types][types-badge]][npm-url]
-[![Donate][donate-badge]][donate-url]
 
 [![Dependencies][dep-badge]][dep-url]
 [![Dev Dependencies][dev-dep-badge]][dev-dep-url]
@@ -23,9 +24,11 @@
 [dev-dep-url]: https://david-dm.org/iccicci/rotating-file-stream?type=dev
 [donate-badge]: https://badgen.net/badge/donate/bitcoin?icon=bitcoin
 [donate-url]: https://blockchain.info/address/12p1p5q7sK75tPyuesZmssiMYr4TKzpSCN
+[github-url]: https://github.com/iccicci/rotating-file-stream
 [npm-downloads-badge]: https://badgen.net/npm/dm/rotating-file-stream?icon=npm
 [npm-badge]: https://badgen.net/npm/v/rotating-file-stream?color=green&icon=npm
 [npm-url]: https://www.npmjs.com/package/rotating-file-stream
+[stars-badge]: https://badgen.net/github/stars/iccicci/rotating-file-stream?icon=github
 [travis-badge]: https://badgen.net/travis/iccicci/rotating-file-stream?icon=travis
 [travis-url]: https://travis-ci.org/iccicci/rotating-file-stream?branch=master
 [types-badge]: https://badgen.net/npm/types/rotating-file-stream?color=green&icon=typescript
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..b5699c2
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,109 @@
+/// <reference types="node" />
+import { Writable } from "stream";
+export declare type Compressor = (source: string, dest: string) => string;
+export declare type Generator = (time: number | Date, index?: number) => string;
+export interface Options {
+    compress?: boolean | string | Compressor;
+    encoding?: BufferEncoding;
+    history?: string;
+    immutable?: boolean;
+    initialRotation?: boolean;
+    interval?: string;
+    intervalBoundary?: boolean;
+    maxFiles?: number;
+    maxSize?: string;
+    mode?: number;
+    path?: string;
+    rotate?: number;
+    size?: string;
+    teeToStdout?: boolean;
+}
+interface Opts {
+    compress?: string | Compressor;
+    encoding?: BufferEncoding;
+    history?: string;
+    immutable?: boolean;
+    initialRotation?: boolean;
+    interval?: {
+        num: number;
+        unit: string;
+    };
+    intervalBoundary?: boolean;
+    maxFiles?: number;
+    maxSize?: number;
+    mode?: number;
+    path?: string;
+    rotate?: number;
+    size?: number;
+    teeToStdout?: boolean;
+}
+declare type Callback = (error?: Error) => void;
+interface Chunk {
+    chunk: Buffer;
+    encoding: BufferEncoding;
+    next: Chunk;
+}
+export declare class RotatingFileStream extends Writable {
+    private createGzip;
+    private destroyer;
+    private error;
+    private exec;
+    private filename;
+    private finished;
+    private fsClose;
+    private fsCreateReadStream;
+    private fsCreateWriteStream;
+    private fsMkdir;
+    private fsOpen;
+    private fsReadFile;
+    private fsRename;
+    private fsStat;
+    private fsUnlink;
+    private fsWrite;
+    private fsWriteFile;
+    private generator;
+    private last;
+    private maxTimeout;
+    private next;
+    private opened;
+    private options;
+    private prev;
+    private rotatedName;
+    private rotation;
+    private size;
+    private stream;
+    private timer;
+    constructor(generator: Generator, options: Opts);
+    _destroy(error: Error, callback: Callback): void;
+    _final(callback: Callback): void;
+    _write(chunk: Buffer, encoding: BufferEncoding, callback: Callback): void;
+    _writev(chunks: Chunk[], callback: Callback): void;
+    private rewrite;
+    private init;
+    private makePath;
+    private reopen;
+    private reclose;
+    private now;
+    private rotate;
+    private findName;
+    private move;
+    private touch;
+    private classical;
+    private clear;
+    private intervalBoundsBig;
+    private intervalBounds;
+    private interval;
+    private compress;
+    private external;
+    private gzip;
+    private rotated;
+    private history;
+    private historyGather;
+    private historyRemove;
+    private historyCheckFiles;
+    private historyCheckSize;
+    private historyWrite;
+    private immutate;
+}
+export declare function createStream(filename: string | Generator, options?: Options): RotatingFileStream;
+export {};
diff --git a/package.json b/package.json
index 99508f3..992a024 100644
--- a/package.json
+++ b/package.json
@@ -8,8 +8,7 @@
 		"coverage": "tsc && TZ=\"Europe/Rome\" nyc -r lcov -r text -r text-summary -r html mocha -r ts-node/register test/*ts",
 		"eslint": "eslint index.ts utils.ts test/*ts",
 		"ignore": "node -r ts-node/register utils.ts ignore",
-		"prepare": "npm run ignore && tsc && npm run readme",
-		"readme": "node -r ts-node/register utils.ts readme",
+		"prepare": "npm run ignore && tsc",
 		"test": "npm run clean && mocha -r ts-node/register test/*ts"
 	},
 	"bugs": "https://github.com/iccicci/rotating-file-stream/issues",
@@ -48,5 +47,22 @@
 		"nyc": "15.0.1",
 		"ts-node": "8.10.1",
 		"typescript": "3.9.2"
+	},
+	"prettier": {
+		"arrowParens": "avoid",
+		"jsxBracketSameLine": true,
+		"printWidth": 200,
+		"trailingComma": "none",
+		"useTabs": true,
+		"overrides": [
+			{
+				"files": [
+					"*.md"
+				],
+				"options": {
+					"useTabs": false
+				}
+			}
+		]
 	}
 }
diff --git a/test/05options.ts b/test/05options.ts
index 3a4e91d..ec74542 100644
--- a/test/05options.ts
+++ b/test/05options.ts
@@ -136,7 +136,7 @@ describe("options", () => {
 	});
 
 	describe("teeToStdout", () => {
-		const content = [];
+		const content: { str: string | Uint8Array; encoding: string | ((err?: Error) => void); cb: undefined | ((err?: Error) => void) }[] = [];
 
 		const events = test({ options: { size: "10B", teeToStdout: true } }, rfs => {
 			const write = process.stdout.write;
diff --git a/tsconfig.json b/tsconfig.json
index 2c80b7d..520931a 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,6 +2,8 @@
 	"compilerOptions": {
 		"declaration": true,
 		"module": "commonjs",
+		"noImplicitAny": true,
+		"suppressImplicitAnyIndexErrors": true,
 		"target": "es6"
 	},
 	"include": ["./index.ts"]
diff --git a/utils.ts b/utils.ts
index 5d030d0..46d7aec 100644
--- a/utils.ts
+++ b/utils.ts
@@ -1,52 +1,10 @@
 "use strict";
 
-import { readFile, unlink, writeFile } from "fs";
+import { unlink, writeFile } from "fs";
 
 const common: string[] = ["*gz", "*log", "*tmp", "*txt", ".gitignore", ".npmignore", ".nyc_output", "coverage", "node_modules", ""];
-const git: string[] = ["index.d.ts", "index.js"];
-const npm: string[] = [".*", "index.ts", "test", "tsconfig.json", "tslint.json", "utils.ts"];
+const git: string[] = ["index.js"];
+const npm: string[] = [".*", "index.ts", "test", "tsconfig.json", "utils.ts"];
 
-const readme: (err: Error, data: string) => void = (err, data) => {
-	if(err) return process.stderr.write(`Error reading README.md: ${err.message}`);
-
-	const input = data.split("\n");
-
-	readFile("index.d.ts", "utf8", (err: Error, data: string) => {
-		if(err) return process.stderr.write(`Error reading index.d.ts: ${err.message}`);
-
-		const output = [];
-		let begin: boolean, end: boolean;
-
-		input.map((line: string) => {
-			if(begin) {
-				if(end) output.push(line);
-				else if(line === "```") {
-					output.push(line);
-					end = true;
-				}
-			}
-
-			if(! begin) {
-				output.push(line);
-				if(line === "```typescript") {
-					let first: boolean, interf: boolean;
-					begin = true;
-					data.split("\n").map((line: string) => {
-						if(! first) return (first = true);
-						if(interf) return (interf = ! line.match(/}$/));
-						if(line.match(/interface Chunk/) || line.match(/interface Opts/)) return (interf = true);
-						if(line.match(/class RotatingFileStream/)) interf = ((line = line.replace("{", "{}")) as unknown) as boolean;
-						if(! line.match(/Callback/) && ! line.match(/export \{}/)) output.push(line.replace("    ", "  "));
-					});
-					output.pop();
-				}
-			}
-		});
-
-		writeFile("README.md", output.join("\n"), () => {});
-	});
-};
-
-if(process.argv[2] === "clean") unlink("index.js", (): void => unlink("index.d.ts", (): void => {}));
+if(process.argv[2] === "clean") unlink("index.js", (): void => {});
 if(process.argv[2] === "ignore") writeFile(".gitignore", git.concat(common).join("\n"), (): void => writeFile(".npmignore", npm.concat(common).join("\n"), (): void => {}));
-if(process.argv[2] === "readme") readFile("README.md", "utf8", readme);