chore: Remove @metamask/eth-block-tracker peer dependency

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- Remove `@metamask/eth-block-tracker` peer dependency ([#85](https://github.com/MetaMask/nonce-tracker/pull/85))
 
 ## [6.0.1]
 ### Fixed

package.json

@@ -35,7 +35,6 @@
     "@metamask/eslint-config-mocha": "^10.0.0",
     "@metamask/eslint-config-nodejs": "^10.0.0",
     "@metamask/eslint-config-typescript": "^10.0.0",
-    "@metamask/eth-block-tracker": "^9.0.3",
     "@types/node": "^16.18.59",
     "@typescript-eslint/eslint-plugin": "^5.30.7",
     "@typescript-eslint/parser": "^5.30.7",
@@ -53,9 +52,6 @@
     "typescript": "^4.0.7",
     "xtend": "^4.0.1"
   },
-  "peerDependencies": {
-    "@metamask/eth-block-tracker": ">=9"
-  },
   "engines": {
     "node": "^16.20 || ^18.16 || >=20"
   },

src/NonceTracker.ts

@@ -1,9 +1,16 @@
 import assert from 'assert';
 import { Mutex } from 'async-mutex';
-import type { BlockTracker } from '@metamask/eth-block-tracker';
 
 import { Web3Provider } from '@ethersproject/providers';
 
+/**
+ * A minimal "block tracker" type, with just the method used here. This is based upon the
+ * `BlockTracker` type from `@metamask/eth-block-tracker` v9.
+ */
+type BlockTracker = {
+  getLatestBlock: () => Promise<string>;
+};
+
 /**
  * @property opts.provider - An ethereum provider
  * @property opts.blockTracker - An instance of @metamask/eth-block-tracker