wasm: Make sure the param to use() is of the appropriate subtype

Author: pdubroy

packages/wasm/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@ohm-js/wasm",
-  "version": "0.6.16",
+  "version": "0.6.17",
   "description": "Compile Ohm.js grammars to WebAsssembly",
   "main": "dist/index.js",
   "exports": {

packages/wasm/src/miniohm.ts

@@ -757,7 +757,7 @@ export class MatchResult {
       : '[match succeeded]';
   }
 
-  use<T>(cb: (r: MatchResult) => T): T {
+  use<T>(cb: (r: this) => T): T {
     try {
       this.grammar._beginUse(this);
       return cb(this);