diff --git a/.changeset/odd-experts-protect.md b/.changeset/odd-experts-protect.md
new file mode 100644
index 00000000..b1e5a2d9
--- /dev/null
+++ b/.changeset/odd-experts-protect.md
@@ -0,0 +1,5 @@
+---
+"@bfra.me/eslint-config": patch
+---
+
+Improve error handling.
diff --git a/.changeset/strange-coins-bake.md b/.changeset/strange-coins-bake.md
new file mode 100644
index 00000000..71822f15
--- /dev/null
+++ b/.changeset/strange-coins-bake.md
@@ -0,0 +1,6 @@
+---
+"@bfra.me/eslint-config": patch
+---
+
+Improve types.
+  
\ No newline at end of file
diff --git a/packages/eslint-config/src/package-utils.ts b/packages/eslint-config/src/package-utils.ts
index abfaba98..9bd71500 100644
--- a/packages/eslint-config/src/package-utils.ts
+++ b/packages/eslint-config/src/package-utils.ts
@@ -78,8 +78,10 @@ function installPackageSync(packages: string | string[], options: {cwd: string;
     {cwd: options.cwd, maxBuffer: Infinity, stdio: 'inherit', windowsHide: true},
   )
 
-  if (result.error) {
-    throw result.error
+  if (result.error || result.status !== 0) {
+    const errorMessage =
+      result.error?.message || `Package installation failed with status ${result.status}`
+    throw new Error(errorMessage)
   }
 
   return `${result.output}`
diff --git a/packages/eslint-config/src/rules/missing-module-for-config.ts b/packages/eslint-config/src/rules/missing-module-for-config.ts
index 787b311a..0dcccb10 100644
--- a/packages/eslint-config/src/rules/missing-module-for-config.ts
+++ b/packages/eslint-config/src/rules/missing-module-for-config.ts
@@ -1,4 +1,4 @@
-import {Linter, type Rule} from 'eslint'
+import {Linter, type Rule, type SourceCode} from 'eslint'
 import {getPackageInstallCommand, tryInstall} from '../package-utils'
 
 // Whether to install the missing module(s) for the config
@@ -10,19 +10,19 @@ let shouldFix = false
   Object.defineProperty(Linter.prototype, 'verify', {
     configurable: true,
     value(
-      textOrSourceCode: unknown,
-      config: unknown,
-      options: undefined | {fix?: boolean},
-      ...args: unknown[]
+      code: string | SourceCode,
+      config: Linter.Config,
+      options: Linter.LintOptions | {fix?: boolean} | undefined,
+      ...args: Parameters<typeof verify>
     ) {
-      shouldFix = Boolean(options && options.fix !== undefined && options.fix)
-      return verify.call(this, textOrSourceCode, config, options, ...args)
+      shouldFix = typeof options === 'object' && options !== null && 'fix' in options && options.fix
+      return verify.call(this, code, config, options, ...args)
     },
     writable: true,
   })
 })()
 
-export const meta = {
+export const meta: Rule.RuleMetaData = {
   docs: {
     description: 'Missing module for config',
     url: 'https://github.com/bfra-me/works',