diff --git a/types/metalsmith/index.d.ts b/types/metalsmith/index.d.ts
new file mode 100644
index 0000000000..811b2534b4
--- /dev/null
+++ b/types/metalsmith/index.d.ts
@@ -0,0 +1,334 @@
+// Type definitions for metalsmith 2.3
+// Project: https://github.com/segmentio/metalsmith
+// Definitions by: Brian Lagerman <https://github.com/brian-lagerman>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.1
+
+/// <reference types="node" />
+import { Stats } from "fs";
+interface Metalsmith {
+    /**
+     * Set the path of the `working` directory.
+     * @param directory Relative or absolute `working` directory path.
+     * @example
+     * Set the relative `working` directory to './working'
+     * Metalsmith(__dirname).directory("working");
+     * @example
+     * Set the absolute `working` directory to 'C:\Projects\Metalsmith\'
+     * Metalsmith(__dirname).directory("C:\\\Projects\\\Metalsmith");
+     * @link [API] https://github.com/segmentio/metalsmith#api
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L62
+     */
+    directory(directory: string): Metalsmith;
+    /**
+     * Get the absolute path of the `working` directory
+     * @example
+     * Retrieve the absolute `working` directory path
+     * var wrk:string = Metalsmith(__dirname).directory();
+     * @link [API] https://github.com/segmentio/metalsmith#api
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L62
+     */
+    directory(): string;
+    /**
+     * Set the path of the `source` directory.
+     * @param path [path='src'] - Relative or absolute `source` directory path.
+     * @example
+     * Set the relative `source` directory to './src' (the default)
+     * Metalsmith(__dirname).source("src");
+     * @example
+     * Set the absolute `source` directory to 'C:\Projects\Site\'
+     * Metalsmith(__dirname).source("C:\\\Projects\\\Site");
+     * @link [API] https://github.com/segmentio/metalsmith#sourcepath
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L90
+     */
+    source(path: string): Metalsmith;
+    /**
+     * Get the absolute path of the `source` directory.
+     * @example
+     * Retrieve the absolute `source` directory path
+     * var src:string = Metalsmith(__dirname).source();
+     * @link [API] https://github.com/segmentio/metalsmith#sourcepath
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L90
+     */
+    source(): string;
+    /**
+     * Set the path of the `destination` directory.
+     * @param path [path='build'] - Relative or absolute `destination` directory path.
+     * @example
+     * Set the relative `destination` directory to './build' (the default)
+     * Metalsmith(__dirname).destination("build");
+     * @example
+     * Set the absolute `destination` directory to 'C:\Projects\Out\'
+     * Metalsmith(__dirname).destination("C:\\\Projects\\\Out");
+     * @link [API] https://github.com/segmentio/metalsmith#destinationpath
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L104
+     */
+    destination(path: string): Metalsmith;
+    /**
+     * Get the absolute path of the `destination` directory.
+     * @example
+     * Retrieve the absolute `destination` directory path
+     * var dst:string = Metalsmith(__dirname).destination();
+     * @link [API] https://github.com/segmentio/metalsmith#destinationpath
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L104
+     */
+    destination(): string;
+    /**
+     * Set the `maximum` number of files to open at once.
+     * @param max [max=Infinity] - The `maximum` number of open files.
+     * @example
+     * Set the `maximum` number of files to open at once to 50
+     * Metalsmith(__dirname).concurrency(50);
+     * @link [API] https://github.com/segmentio/metalsmith#concurrencymax
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L118
+     */
+    concurrency(max: number): Metalsmith;
+    /**
+     * Get the `maximum` number of files to open at once.
+     * @example
+     * Retrieve the `maximum` number of files to open at once
+     * var max:number = Metalsmith(__dirname).concurrency();
+     * @link [API] https://github.com/segmentio/metalsmith#concurrencymax
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L118
+     */
+    concurrency(): number;
+    /**
+     * Set whether the destination directory will be `cleaned` before writing.
+     * @param clean [clean=true] - Flag to `clean` destination directory.
+     * @example
+     * Set the flag to `clean` the destination directory to false
+     * Metalsmith(__dirname).clean(false);
+     * @link [API] https://github.com/segmentio/metalsmith#cleanboolean
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L132
+     */
+    clean(clean: boolean): Metalsmith;
+    /**
+     * Get the flag on whether the destination directory will be `cleaned` before writing.
+     * @example
+     * Retrieve the `clean` flag indicating destination directory removal
+     * var clean:boolean = Metalsmith(__dirname).clean();
+     * @link [API] https://github.com/segmentio/metalsmith#cleanboolean
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L132
+     */
+    clean(): boolean;
+    /**
+     * Set the flag on whether to parse YAML `frontmatter`
+     * @param frontmatter [frontmatter=true] - Flag to parse YAML `frontmatter`.
+     * @example
+     * Set the flag to parse YAML `frontmatter` to false
+     * Metalsmith(__dirname).frontmatter(false);
+     * @link [API] https://github.com/segmentio/metalsmith#frontmatterboolean
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L145
+     */
+    frontmatter(frontmatter: boolean): Metalsmith;
+    /**
+     * Get the flag on whether to parse YAML `frontmatter`
+     * @example
+     * Retrieve the `frontmatter` flag indicating YAML parsing
+     * var parse:boolean = Metalsmith(__dirname).frontmatter();
+     * @link [API] https://github.com/segmentio/metalsmith#frontmatterboolean
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L145
+     */
+    frontmatter(): boolean;
+    /**
+     * Set the global `metadata` object to pass to templates.
+     * @param metadata - The global metadata (json).
+     * @example
+     * Add 'sitename' to the global `metadata` object
+     * Metalsmith(__dirname).metadata({sitename: "My Static Site"});
+     * @link [API] https://github.com/segmentio/metalsmith#metadatajson
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L76
+     */
+    metadata(metadata: object): Metalsmith;
+    /**
+     * Get the global `metadata` object passed to templates.
+     * @example
+     * Retrieve the `metadata` object passed to templates
+     * var meta:object = Metalsmith(__dirname).metadata();
+     * @link [API] https://github.com/segmentio/metalsmith#metadatajson
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L76
+     */
+    metadata(): object;
+    /**
+     * Add a `plugin` function to the stack.
+     * @param plugin - The plugin to add.
+     * @example
+     * Add 'metalsmith-markdown' to the middleware stack
+     * Metalsmith(__dirname).use(markdown());
+     * @link [API] https://github.com/segmentio/metalsmith#useplugin
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L50
+     */
+    use(plugin: Metalsmith.Plugin | Metalsmith.Plugin[]): Metalsmith;
+    /**
+     * Set the `Ignore` files/paths from being loaded into Metalsmith.
+     * @param files - The file(s) or directories to `ignore`.
+     * @example
+     * Add an `ignore` file to prevent load into Metalsmith
+     * Metalsmith(__dirname).ignore("corrupted.html");
+     * @example
+     * Add an `ignore` function to prevent load into Metalsmith
+     * Metalsmith(__dirname).ignore(ignore(function (filepath: string, stats: Stats) {
+     *      return stats.isDirectory() && path.basename(filepath) === 'nested';
+     * });
+     * @link [API] https://github.com/segmentio/metalsmith#ignorepath
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L159
+     */
+    ignore(files: string | string[] | Metalsmith.Ignore | Metalsmith.Ignore[]): Metalsmith;
+    /**
+     * Get the array of `Ignored` files/paths.
+     * @example
+     * Retrieve the `ignored` array of files in Metalsmith
+     * var ingnored:string[] = Metalsmith(__dirname).ignore();
+     * @link [API] https://github.com/segmentio/metalsmith#ignorepath
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L159
+     */
+    ignore(): string[];
+    /**
+     * Resolve `paths` relative to the root directory.
+     * @param paths - The `paths` to resolve.
+     * @example
+     * Retrieve the path after resolving sub-directies
+     * var path:string = Metalsmith(__dirname).path("path-a", "path-b");
+     * @link [API] https://github.com/segmentio/metalsmith#pathpaths
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L171
+     */
+    path(...paths: string[]): string;
+    /**
+     * Perform the `build` with the current settings outputting to the destination directory.
+     * @param fn - Optional Callback function.
+     * @example
+     * Perform the `build` with the current settings
+     * Metalsmith(__dirname).build(
+     * function (err: Error): any {
+     *     if (err) {throw err;}
+     * });
+     * @link [API] https://github.com/segmentio/metalsmith#buildfn
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L184
+     */
+    build(fn?: Metalsmith.Callback): object;
+    /**
+     * `Process` files through plugins without writing out files.
+     * @param fn - Optional Callback function.
+     * @example
+     * `Process` the files like `build` without writing any files
+     * Metalsmith(__dirname).process(
+     * function (err: Error): any {
+     *     if (err) {throw err;}
+     * });
+     * @link [API] https://github.com/segmentio/metalsmith#processfn
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L200
+     */
+    process(fn?: Metalsmith.Callback): object;
+    /**
+     * `Run` a set of files through the plugins stack.
+     * @param files - The dictionary of files.
+     * @param fn - Optional Callback function.
+     * @example
+     * `Run` all of the middleware functions on a dictionary of files.
+     * var callback:Metalsmith.Callback = (err: Error, files: object) => {if (err) {throw err;}};
+     * Metalsmith(__dirname).run({fileA: "a.html"} , callback);
+     * @link [API] https://github.com/segmentio/metalsmith#runfiles-fn
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L212
+     */
+    run(files: object, fn?: Metalsmith.Callback): object;
+    /**
+     * `Run` a set of files through the plugins stack.
+     * @param files - The dictionary of files.
+     * @param fn - Optional Callback function.
+     * @example
+     * `Run` all of the middleware functions on a dictionary of files.
+     * var callback:Metalsmith.Callback = (err: Error, files: object) => {if (err) {throw err;}};
+     * Metalsmith(__dirname).run({fileA: "a.html"} , callback);
+     * @link [API] https://github.com/segmentio/metalsmith#runfiles-fn
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L212
+     */
+    run(files: object, plugins: Metalsmith.Plugin[], fn?: Metalsmith.Callback): object;
+    /**
+     * Read a dictionary of files from a `dir`, parsing frontmatter. If no directory
+     * is provided, it will default to the source directory.
+     * @param dir - Optional dictionary of files.
+     * @example
+     * Read a dictionary of files from a `dir`.
+     * var files:object = Metalsmith(__dirname).read("subdir");
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L227
+     */
+    read(dir: string, fn?: Metalsmith.Callback): object;
+    /**
+     * Read a dictionary of files from a `dir`, parsing frontmatter. If no directory
+     * is provided, it will default to the source directory.
+     * @param fn - Optional Callback function.
+     * @example
+     * Read a dictionary of files from a `dir`.
+     * var files:object = Metalsmith(__dirname).read("subdir");
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L227
+     */
+    read(fn: Metalsmith.Callback): object;
+    /**
+     * Read a `file` by path. If the path is not absolute, it will be resolved
+     * relative to the source directory.
+     * @param file - The file path.
+     * @example
+     * Read a `file` by path.
+     * var fileData:object = Metalsmith(__dirname).readFile("a.html");
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L261
+     */
+    readFile(file: string): object;
+    /**
+     * Write a dictionary of `files` to a destination `dir`. If no directory is
+     * provided, it will default to the destination directory.
+     * @param files - Dictionary of files.
+     * @param dir - Optional destination directory.
+     * @param fn - Optional Callback function.
+     * @example
+     * Write a dictionary of `files` to a destination `dir`.
+     * Metalsmith(__dirname).write({fileA: "a.html"} , "C:\\\OutDir");
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L308
+     */
+    write(files: object, dir?: string, fn?: Metalsmith.Callback): void;
+    /**
+     * Write a dictionary of `files` to a destination `dir`. If no directory is
+     * provided, it will default to the destination directory.
+     * @param files - Dictionary of files.
+     * @param dir - Optional destination directory.
+     * @example
+     * Write a dictionary of `files` to a destination `dir`.
+     * Metalsmith(__dirname).write({fileA: "a.html"} , "C:\\\OutDir");
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L308
+     */
+    write(files: object, fn: Metalsmith.Callback): void;
+    /**
+     * Write a `file` by path with `data`. If the path is not absolute, it will be
+     * resolved relative to the destination directory.
+     * @param file - File path.
+     * @param data - The file data.
+     * @example
+     * Write a `file` by path with `data`.
+     * Metalsmith(__dirname).writeFile("test.html", {contents: "File Contents"});
+     * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L336
+     */
+    writeFile(file: string, data: object): void;
+}
+
+/**
+ * Initialize a new `Metalsmith` builder with a working `directory`.
+ * @param directory  - The working directory.
+ * @example
+ * initialize Metalsmith with the node.js working directory
+ * Metalsmith(__dirname);
+ * @link [Metalsmith] http://www.metalsmith.io/
+ * @link [API] https://github.com/segmentio/metalsmith#new-metalsmithdir
+ * @link [Source] https://github.com/segmentio/metalsmith/blob/00b2c7aaee13fbe0f7fb3be332929a303b2df51d/lib/index.js#L30
+ */
+declare function Metalsmith(directory: string): Metalsmith;
+
+declare namespace Metalsmith {
+    type Plugin = (files: Files, metalsmith: Metalsmith, callback: Callback)  => void;
+    type Callback = (err: Error | null, files: Files, metalsmith: Metalsmith) => void;
+    type Ignore = (path: string, stat: Stats) => void;
+
+    interface Files {
+      [index: string]: any;
+    }
+}
+
+export = Metalsmith;
diff --git a/types/metalsmith/metalsmith-tests.ts b/types/metalsmith/metalsmith-tests.ts
new file mode 100644
index 0000000000..168fed5c03
--- /dev/null
+++ b/types/metalsmith/metalsmith-tests.ts
@@ -0,0 +1,106 @@
+"use strict";
+
+import * as Metalsmith from "metalsmith";
+const collections = require('metalsmith-collections');
+const layouts     = require('metalsmith-layouts');
+const markdown    = require('metalsmith-markdown');
+const permalinks  = require('metalsmith-permalinks');
+
+// Well, here is our elevator pitch. It’s as easy as that:
+Metalsmith(__dirname)         // __dirname defined by node.js:
+                              // name of current working directory
+  .metadata({                 // add any variable you want
+                              // use them in layout-files
+    sitename: "My Static Site & Blog",
+    siteurl: "http://example.com/",
+    description: "It's about saying »Hello« to the world.",
+    generatorname: "Metalsmith",
+    generatorurl: "http://metalsmith.io/"
+  })
+  .source('./src')            // source directory
+  .destination('./build')     // destination directory
+  .clean(true)                // clean destination before
+  .use(collections({          // group all blog posts by internally
+    posts: 'posts/*.md'       // adding key 'collections':'posts'
+  }))                         // use `collections.posts` in layouts
+  .use(markdown())            // transpile all md into html
+  .use(permalinks({           // change URLs to permalink URLs
+    relative: false           // put css only in /css
+  }))
+  .use(layouts())             // wrap layouts around html
+  .build((err: Error | null) => {      // build process
+    if (err) throw err;       // error handling is required
+  });
+
+// initialize via default export
+Metalsmith(__dirname);
+// initialize via default export with variable assignment
+const m = Metalsmith(__dirname);
+// set relative/absolute working directory
+Metalsmith(__dirname).directory("working");
+Metalsmith(__dirname).directory("C:\\Projects\\Metalsmith");
+// get absolute working directory
+const wrk = Metalsmith(__dirname).directory();
+// set relative/absolute source directory
+Metalsmith(__dirname).source("source");
+Metalsmith(__dirname).source("C:\\Projects\\Site");
+// get absolute source directory
+const src = Metalsmith(__dirname).source();
+// set relative/absolute destination directory
+Metalsmith(__dirname).destination("build");
+Metalsmith(__dirname).destination("C:\\Projects\\Out");
+// get absolute destination directory
+const dst = Metalsmith(__dirname).destination();
+// set max file concurrency
+Metalsmith(__dirname).concurrency(50);
+// get max file concurrency
+const max = Metalsmith(__dirname).concurrency();
+// set destination directory cleaning to false
+Metalsmith(__dirname).clean(false);
+// get destination directory cleaning flag
+const clean = Metalsmith(__dirname).clean();
+// set frontmatter parsing to false
+Metalsmith(__dirname).frontmatter(false);
+// get frontmatter parsing flag
+const parse = Metalsmith(__dirname).frontmatter();
+// set global metadata object
+Metalsmith(__dirname).metadata({ sitename: "My Static Site" });
+// get global metadata object
+const meta = Metalsmith(__dirname).metadata();
+// plugin mock-up
+function fakePlugin(files: Metalsmith.Files, metalsmith: Metalsmith, done: any) {
+    return;
+}
+// add a fakePlugin to the metalsmith pipeline
+Metalsmith(__dirname).use(fakePlugin);
+// add an ignore file
+Metalsmith(__dirname).ignore("corrupted.html");
+// get ignored files
+const ingnored = Metalsmith(__dirname).ignore();
+// resolve "path-a" and "path-b" on working directory
+const path = Metalsmith(__dirname).path("path-a", "path-b");
+// build without callback handler (not recommended, but allowed)
+Metalsmith(__dirname).build();
+const callback = (err: Error | null, files: Metalsmith.Files) => { if (err) {
+    throw err;
+} };
+// build with callback handler
+Metalsmith(__dirname).build(callback);
+// process without callback handler (not recommended, but allowed)
+Metalsmith(__dirname).process();
+// process with callback handler
+Metalsmith(__dirname).process((err: Error | null) => {
+    if (err) {
+        throw err;
+    }
+});
+// run with callback handler
+Metalsmith(__dirname).run({ fileA: "a.html" }, callback);
+// read
+const files = Metalsmith(__dirname).read("subdir");
+// readFile
+const fileData = Metalsmith(__dirname).readFile("a.html");
+// write
+Metalsmith(__dirname).write({ fileA: "a.html" }, "C:\\OutDir");
+// writeFile
+Metalsmith(__dirname).writeFile("test.html", { contents: "File Contents" });
diff --git a/types/metalsmith/tsconfig.json b/types/metalsmith/tsconfig.json
new file mode 100644
index 0000000000..32634ef487
--- /dev/null
+++ b/types/metalsmith/tsconfig.json
@@ -0,0 +1,21 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [ "../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "metalsmith-tests.ts"
+    ]
+}
\ No newline at end of file
diff --git a/types/metalsmith/tslint.json b/types/metalsmith/tslint.json
new file mode 100644
index 0000000000..9b33e94a82
--- /dev/null
+++ b/types/metalsmith/tslint.json
@@ -0,0 +1,8 @@
+{
+    "extends": "dtslint/dt.json",
+    "rules": {
+        "no-var-requires": false,
+        "no-single-declare-module": false,
+        "no-declare-current-package": false
+    }
+}
\ No newline at end of file