diff --git a/src/constants.js b/src/constants.js
index ed5b65a9..2e9a2070 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -53,7 +53,7 @@ export const INITIAL_FOREST_WIDTH = 4
 export const INITIAL_FOREST_HEIGHT = 1
 
 /**
- * @type Map<number, farmhand.purchasableFieldSize>
+ * @type Map<number, farmhand.purchaseableFieldSize>
  */
 export const PURCHASABLE_FOREST_SIZES = freeze(
   new Map([
diff --git a/tsconfig.json b/tsconfig.json
index c295a38c..3b5ce50b 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -5,8 +5,10 @@
     /* Basic Options */
     // "incremental": true,                         /* Enable incremental compilation */
     "target": "es5" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', 'ES2021', or 'ESNEXT'. */,
-    "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */,
-    // "lib": [],                                   /* Specify library files to be included in the compilation. */
+    "module": "ES2022" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */,
+    "lib": [
+      "ES2022"
+    ] /* Specify library files to be included in the compilation. */,
     // "allowJs": true,                             /* Allow javascript files to be compiled. */
     "checkJs": true /* Report errors in .js files. */,
     "jsx": "preserve" /* Specify JSX code generation: 'preserve', 'react-native', 'react', 'react-jsx' or 'react-jsxdev'. */,