Add TypeScript definitions

Author: jharris4

package.json

@@ -3,6 +3,7 @@
   "version": "2.0.15",
   "description": "lets you define html tags to inject with html-webpack-plugin",
   "main": "index.js",
+  "types": "typings.d.ts",
   "engines": {
     "node": ">=8"
   },

typings.d.ts

@@ -0,0 +1,74 @@
+import { Compiler } from 'webpack';
+
+export = HtmlWebpackTagsPlugin;
+
+declare class HtmlWebpackTagsPlugin {
+  constructor(options?: HtmlWebpackTagsPlugin.Options);
+
+  apply(compiler: Compiler): void;
+}
+
+declare namespace HtmlWebpackTagsPlugin {
+  type AddHashFunction = (assetPath: string, hash: string) => string;
+  type AddPublicPathFunction = (assetPath: string, publicPath: string) => string;
+  type TypeString = 'css' | 'js';
+  type AttributesObject = { [attributeName: string]: string | boolean | number };
+
+  interface CommonOptions {
+    append?: boolean;
+    useHash?: boolean;
+    addHash?: AddHashFunction
+    hash?: boolean | string | AddHashFunction;
+    usePublicPath?: boolean;
+    addPublicPath?: AddPublicPathFunction
+    publicPath?: boolean | string | AddPublicPathFunction;
+  }
+
+  interface Options extends CommonOptions {
+    append?: boolean;
+    prependExternals?: boolean;
+    jsExtensions?: string | string[];
+    cssExtensions?: string | string[];
+    files?: string[];
+    tags?: string | MaybeLinkTagOptions | MaybeScriptTagOptions | Array<string | MaybeLinkTagOptions | MaybeScriptTagOptions>;
+    links?: string | LinkTagOptions | Array<string | LinkTagOptions>;
+    scripts?: string | ScriptTagOptions | Array<string | ScriptTagOptions>;
+    metas?: string | MetaTagOptions | Array<string | MetaTagOptions>;
+  }
+
+  interface ExternalObject {
+    packageName: string;
+    variableName: string;
+  }
+
+  interface BaseTagOptions extends CommonOptions {
+    glob?: string;
+    globPath?: string;
+    globFlatten?: boolean;
+    sourcePath?: string;
+  }
+
+  interface LinkTagOptions extends BaseTagOptions {
+    path: string;
+    attributes?: AttributesObject;
+  }
+
+  interface ScriptTagOptions extends BaseTagOptions {
+    path: string;
+    attributes?: AttributesObject;
+    external?: ExternalObject
+  }
+
+  interface MaybeLinkTagOptions extends LinkTagOptions {
+    type?: TypeString;
+  }
+
+  interface MaybeScriptTagOptions extends ScriptTagOptions {
+    type?: TypeString;
+  }
+
+  interface MetaTagOptions extends BaseTagOptions {
+    path?: string;
+    attributes: AttributesObject;
+  }
+}