fix: normalize scanUsage option to boolean

The scanUsage option was not passed through toBool(), so string values
like "false" were treated as truthy. Use toBool() when the value is
provided while preserving the !compare default when it is not.

Closes #310

Author: sukets16

src/config/options.ts

@@ -39,7 +39,7 @@ export function normalizeOptions(raw: RawOptions): Options {
   const noColor = toBool(raw.noColor);
   const compare = toBool(raw.compare);
   const strict = toBool(raw.strict);
-  const scanUsage = raw.scanUsage ?? !compare;
+  const scanUsage = raw.scanUsage != null ? toBool(raw.scanUsage) : !compare;
 
   const showUnused = raw.showUnused !== false;
   const showStats = raw.showStats !== false;

test/unit/config/options.test.ts

@@ -84,4 +84,9 @@ describe('normalizeOptions', () => {
     expect(normalizeOptions({}).scanUsage).toBe(true);
     expect(normalizeOptions({ compare: true }).scanUsage).toBe(false);
   });
+
+  it('normalizes scanUsage string values to boolean', () => {
+    expect(normalizeOptions({ scanUsage: 'true' as unknown as boolean }).scanUsage).toBe(true);
+    expect(normalizeOptions({ scanUsage: 'false' as unknown as boolean }).scanUsage).toBe(false);
+  });
 });