license-checker-webpack-plugin: Fix outputWriter type (#38579)

The function is passed an object containing a dependencies array, not the array
itself.

types/license-checker-webpack-plugin/index.d.ts

@@ -19,6 +19,12 @@ declare namespace LicenseCheckerWebpackPlugin {
         licenseText: string;
     }
 
+    interface OutputWriterArgs {
+        dependencies: Dependency[];
+    }
+
+    type OutputWriter = (args: OutputWriterArgs) => string;
+
     interface Options {
         /**
          * Regular expression that matches the file paths of dependencies to check.
@@ -59,7 +65,7 @@ declare namespace LicenseCheckerWebpackPlugin {
          * Path to a `.ejs` template, or function that will generate the contents
          * of the third-party notices file.
          */
-        outputWriter: string | ((dependencies: Dependency[]) => string);
+        outputWriter: string | OutputWriter;
 
         /**
          * Name of the third-party notices file with all licensing information.

types/license-checker-webpack-plugin/license-checker-webpack-plugin-tests.ts

@@ -18,7 +18,8 @@ new LicenseCheckerWebpackPlugin({
 // $ExpectType LicenseCheckerWebpackPlugin
 new LicenseCheckerWebpackPlugin({
     filter: /.*/,
-    outputWriter: (dependencies) => {
+    outputWriter: ({ dependencies }) => {
+        dependencies; // $ExpectType Dependency[]
         return dependencies.map(d => `${d.name} ${d.licenseName}`).join('\n');
     },
 });