diff --git a/tsconfig.json b/tsconfig.json
index d056caa08..ef472b287 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,6 +4,7 @@
     "target": "es2016",                       /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     "lib": [                                  /* Specify library files to be included in the compilation. */
+        "dom",    // Required to access `window`
         "es2017", // Required by `@sindresorhus/is`
     ],
     // "allowJs": true,                       /* Allow javascript files to be compiled. */