Add type declaration

index.d.ts

@@ -0,0 +1,37 @@
+import { Plugin } from "rollup";
+
+declare const analyzer: (options?: AnalyzerOptions) => Plugin;
+export default analyzer;
+
+export interface AnalyzerOptions {
+  stdout?: boolean;
+  limit?: number;
+  filter?: string | string[] | ((id: string) => boolean);
+  root?: string;
+  hideDeps?: boolean;
+  showExports?: boolean;
+  summaryOnly?: boolean;
+  skipFormatted?: boolean;
+  writeTo?: (analysisString: string) => void;
+  transformModuleId?: (id: string) => string;
+  onAnalysis?: (analysisObject: AnalysisObject) => void;
+}
+
+export interface AnalysisObject {
+  bundleSize: number;
+  bundleOrigSize: number;
+  bundleReduction: number;
+  moduleCount: number;
+  modules: Module[];
+}
+
+export interface Module {
+  id: string;
+  size: number;
+  origSize: number;
+  dependents: string[];
+  percent: number;
+  reduction: number;
+  usedExports: string[];
+  unusedExports: string[];
+}

package.json

@@ -2,11 +2,14 @@
   "name": "rollup-plugin-analyzer",
   "version": "3.2.2",
   "description": "Mad metrics for your rollup bundles, know all the things",
-  "engines" : { "node" : ">=8.0.0" },
+  "engines": {
+    "node": ">=8.0.0"
+  },
   "main": "index.js",
   "module": "module.js",
   "files": [
     "index.js",
+    "index.d.ts",
     "module.js"
   ],
   "scripts": {