Add definitions for RTrace hooks (#1558)

Author: jtenner

lib/rtrace/index.d.ts

@@ -24,7 +24,7 @@ export declare interface RtraceOptions {
   /** Function being called with information messages. */
   oninfo?: (msg: string) => void,
   /** Obtains the module's memory instance. */
-  getMemory()
+  getMemory(): WebAssembly.Memory;
 }
 
 export declare class Rtrace {
@@ -38,4 +38,25 @@ export declare class Rtrace {
 
   /** Checks if there are any leaks and emits them via `oninfo`. Returns the number of live blocks. */
   check(): number;
+
+  /** A function that is called when an allocation occurs. */
+  onalloc(ptr: number): void;
+
+  /** A function that is called when a heap allocation resize occurs. */
+  onresize(ptr: number, oldSize: number): void;
+
+  /** A function that is called when an object is moved on the heap. */
+  onmove(oldPtr: number, newPtr: number): void;
+
+  /** A function that is called when a heap allocation is freed. */
+  onfree(ptr: number): void;
+
+  /** A function that is called when a reference counting increment occurs. */
+  onincrement(ptr: number): void;
+
+  /** A function that is called when a reference counting decrement occurs. */
+  ondecrement(ptr: number): void;
+
+  /** Obtains information about a block. */
+  getBlockInfo(ptr: number): BlockInfo;
 }