diff --git a/package.json b/package.json
index 0ad3de1..4406206 100644
--- a/package.json
+++ b/package.json
@@ -50,10 +50,12 @@
     "url": "https://github.com/stacktracejs/stacktrace-gps/issues"
   },
   "main": "./stacktrace-gps.js",
+  "types": "./stacktrace-gps.d.ts",
   "files": [
     "LICENSE",
     "README.md",
     "stacktrace-gps.js",
+    "stacktrace-gps.d.ts",
     "dist/",
     "node_modules/source-map/"
   ],
diff --git a/stacktrace-gps.d.ts b/stacktrace-gps.d.ts
new file mode 100644
index 0000000..1535200
--- /dev/null
+++ b/stacktrace-gps.d.ts
@@ -0,0 +1,62 @@
+import { SourceMapConsumer } from "source-map";
+import StackFrame = require("stackframe");
+
+declare namespace StackTraceGPS {
+  /**
+   * Options for the StackTraceGPS constructor
+   */
+  interface Options {
+    /** Pre-populate source cache to avoid network requests */
+    sourceCache?: { [url: string]: string | Promise<string> };
+
+    /** Pre-populate SourceMapConsumer cache to avoid network requests */
+    sourceMapConsumerCache?: { [sourceMappingUrl: string]: SourceMapConsumer };
+
+    /** True to prevent network requests (best effort without sources or source maps) */
+    offline?: boolean;
+
+    /** Function to be used for making X-Domain requests */
+    ajax?(url: string): Promise<string>;
+
+    /** Function to convert base64-encoded strings to their original representation */
+    atob?(base64: string): string;
+  }
+}
+
+declare class StackTraceGPS {
+  /**
+   * @param opts - StackTraceGPS.Options object
+   */
+  constructor(opts?: StackTraceGPS.Options);
+
+  /**
+   * Given a StackFrame, enhance function name and use source maps for
+   * a better StackFrame.
+   *
+   * @param stackframe - StackFrame object
+   * @returns Promise that resolves with with source-mapped StackFrame
+   */
+  pinpoint(stackframe: StackFrame): Promise<StackFrame>;
+
+  /**
+   * Given a StackFrame, guess function name from location
+   * information.
+   *
+   * @param stackframe - StackFrame object
+   * @returns Promise that resolves with enhanced StackFrame
+   */
+  findFunctionName(stackframe: StackFrame): Promise<StackFrame>;
+
+  /**
+   * Given a StackFrame, seek source-mapped location and return new
+   * enhanced StackFrame.
+   *
+   * @param stackframe - StackFrame object
+   * @returns Promise that resolves with enhanced StackFrame
+   */
+  getMappedLocation(stackframe: StackFrame): Promise<StackFrame>;
+}
+
+export = StackTraceGPS;
+
+export as namespace StackTraceGPS; // global for non-module UMD users