Add types for tail module

types/tail/index.d.ts

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+// Type definitions for tail 1.2
+// Project: https://github.com/lucagrulla/node-tail
+// Definitions by: Mike Linkovich <https://github.com/spacejack>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
+
+declare namespace Tail {
+    interface TailOptions {
+        separator?: string | RegExp;
+        fromBeginning?: boolean;
+        fsWatchOptions?: Record<string, any>;
+        follow?: boolean;
+        logger?: any;
+        encoding?: string;
+        useWatchFile?: boolean;
+    }
+
+    interface Tail {
+        /** Callback to listen for newlines appended to file */
+        on(eventType: 'line', cb: (data: any) => void): void;
+        /** Error callback */
+        on(eventType: 'error', cb: (error: any) => void): void;
+        /** Stop watching file */
+        unwatch(): void;
+        /** Start watching file if previously stopped */
+        watch(): void;
+    }
+
+    interface TailConstructor {
+        /** Creates a new Tail object that starts watching the specified file immediately. */
+        new(filename: string, options?: TailOptions): Tail;
+    }
+
+    interface Static {
+        Tail: TailConstructor;
+    }
+}
+
+declare const Tail: Tail.Static;
+export = Tail;

types/tail/test.ts

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+import { Tail } from 'tail';
+
+const tail = new Tail("test.txt");
+
+tail.on("line", data => {
+    console.log(data);
+});
+
+tail.on("error", error => {
+    console.log('ERROR: ', error);
+});
+
+tail.unwatch();
+
+tail.watch();
+
+// With options object
+const tail2 = new Tail("test2.txt", {
+    separator: /[\r]{0,1}\n/,
+    fromBeginning: false,
+    fsWatchOptions: {},
+    follow: true,
+    logger: console,
+    useWatchFile: false,
+    encoding: 'utf-8'
+});

types/tail/tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "lib": ["es2015", "dom"],
+    "noImplicitAny": true,
+    "noImplicitThis": true,
+    "strictFunctionTypes": true,
+    "strictNullChecks": true,
+    "forceConsistentCasingInFileNames": true,
+    "noEmit": true,
+    "baseUrl": "../",
+    "typeRoots": ["../"],
+    "types": []
+  },
+  "files": [
+    "index.d.ts",
+    "test.ts"
+  ]
+}

types/tail/tslint.json

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+{
+    "extends": "dtslint/dt.json"
+}