feat: add dependency kind

README.md

@@ -17,7 +17,14 @@ Unused({
   include: [/\.([cm]?[jt]sx?|vue)$/],
   exclude: [/node_modules/],
   level: 'warning', // or 'error'
+  /**
+   * Ignore some dependencies.
+   */
   ignore: ['vue'],
+  /**
+   * Dependency kinds to check.
+   */
+  depKinds: ['dependencies', 'peerDependencies'],
 })
 ```
 

src/core/options.ts

@@ -9,6 +9,10 @@ export interface Options {
    * @default 'warning'
    */
   level?: 'warning' | 'error'
+  /**
+   * @default ['dependencies', 'peerDependencies']
+   */
+  depKinds?: Array<'dependencies' | 'devDependencies' | 'peerDependencies'>
 }
 
 type Overwrite<T, U> = Pick<T, Exclude<keyof T, keyof U>> & U
@@ -24,5 +28,6 @@ export function resolveOptions(options: Options): OptionsResolved {
     exclude: options.exclude || [/node_modules/],
     ignore: options.ignore || [],
     level: options.level || 'warning',
+    depKinds: options.depKinds || ['dependencies', 'peerDependencies'],
   }
 }

src/index.ts

@@ -24,11 +24,14 @@ const plugin: UnpluginInstance<Options | undefined, false> = createUnplugin(
         options.root ||= process.cwd()
         pkgPath = path.resolve(await resolvePackageJSON(options.root))
         const pkg = await readPackageJSON(pkgPath)
-        const dependencies = Object.keys(pkg.dependencies || {})
-        for (const dep of dependencies) {
-          if (options.ignore.includes(dep)) continue
-          deps.add(dep)
-          depsRegex[dep] = new RegExp(`["']${escapeStringRegexp(dep)}['"\\/]`)
+
+        for (const kind of options.depKinds) {
+          const dependencies = Object.keys(pkg[kind] || {})
+          for (const dep of dependencies) {
+            if (options.ignore.includes(dep) || deps.has(dep)) continue
+            deps.add(dep)
+            depsRegex[dep] = new RegExp(`["']${escapeStringRegexp(dep)}['"\\/]`)
+          }
         }
       },