diff --git a/lib/rtrace/index.d.ts b/lib/rtrace/index.d.ts
new file mode 100644
index 00000000..7b1ee1fd
--- /dev/null
+++ b/lib/rtrace/index.d.ts
@@ -0,0 +1,82 @@
+/**
+ * This method returns an `RTrace` object used for reference count tracing.
+ *
+ * @param {TraceEventCallback?} onerror - A method that is called when a trace error event occurs.
+ * @param {TraceEventCallback?} oninfo - A method that is called when a trace info event occurs.
+ */
+declare function rtrace(onerror?: rtrace.TraceEventCallback, oninfo?: rtrace.TraceEventCallback): rtrace.RTrace;
+
+declare namespace rtrace {
+  /**
+   * The RTrace interface represents a collection of properties that help develoeprs describe the
+   * reference counts and state of the Web Assembly module.
+   */
+  export interface RTrace {
+
+    /**
+     * The current allocation count.
+     */
+    allocCount: number;
+
+    /**
+     * The current free count.
+     */
+    freeCount: number;
+
+    /**
+     * The current increment count.
+     */
+    incrementCount: number;
+
+    /**
+     * The current decrement count.
+     */
+    decrementCount: number;
+
+    /**
+     * This method is called when an allocation occurs.
+     *
+     * @param {number} block - The `ptr - 16` value indicating the start of the block.
+     */
+    onalloc(block: number): void;
+
+    /**
+     * This method is called when a block is freed.
+     *
+     * @param {number} block - The `ptr - 16` value indicating the start of the block.
+     */
+    onfree(block: number): void;
+
+    /**
+     * This method is called when a reference count is incrememnted
+     *
+     * @param {number} block - The `ptr - 16` value indicating the start of the block.
+     */
+    onincrement(block: number): void;
+
+    /**
+     * This method is called when a reference count is decremented.
+     *
+     * @param {number} block - The `ptr - 16` value indicating the start of the block.
+     */
+    ondecrement(block: number): void;
+
+    /**
+     * This property indicates if rtrace is active.
+     */
+    readonly active: boolean;
+
+    /**
+     * This method returns the current number of allocated blocks.
+     */
+    check(): number;
+
+  }
+
+  /**
+   * This is a trace event callback. It accepts a string containing a message about the event.
+   */
+  export type TraceEventCallback = (info: string) => void;
+}
+
+export = rtrace;
diff --git a/lib/rtrace/package.json b/lib/rtrace/package.json
index eea8332d..ad802623 100644
--- a/lib/rtrace/package.json
+++ b/lib/rtrace/package.json
@@ -1,5 +1,6 @@
 {
   "name": "@assemblyscript/rtrace",
+  "types": "index.d.ts",
   "version": "0.1.0",
   "license": "Apache-2.0",
   "main": "index.js"
diff --git a/package.json b/package.json
index cd822617..4ecc331f 100644
--- a/package.json
+++ b/package.json
@@ -56,6 +56,10 @@
     "postinstall": "opencollective-postinstall || exit 0"
   },
   "files": [
+    "lib/rtrace/index.d.ts",
+    "lib/rtrace/index.js",
+    "lib/rtrace/README.md",
+    "lib/rtrace/package.json",
     "lib/loader/index.d.ts",
     "lib/loader/index.js",
     "lib/loader/README.md",