🤖 Merge PR DefinitelyTyped#73012 Allow OutputWriter to return promise in license-checker-webpack-plugin by @bawjensen

Co-authored-by: Bryan Jensen <bryan@coda.io>

Author: bawjensen

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

@@ -19,7 +19,7 @@ declare namespace LicenseCheckerWebpackPlugin {
         dependencies: Dependency[];
     }
 
-    type OutputWriter = (args: OutputWriterArgs) => string;
+    type OutputWriter = (args: OutputWriterArgs) => string | Promise<string>;
 
     interface Options {
         /**

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

@@ -11,18 +11,28 @@ new LicenseCheckerWebpackPlugin({
         "querystring-es3@0.2.1": { licenseName: "MIT" },
     },
     emitError: true,
+    // $ExpectType string
     outputWriter: path.resolve(__dirname, "customTemplate.ejs"),
     outputFilename: "ThirdPartyNotices.txt",
 });
 
 // $ExpectType LicenseCheckerWebpackPlugin
 new LicenseCheckerWebpackPlugin({
     filter: /.*/,
+    // $ExpectType ({ dependencies }: OutputWriterArgs) => string
     outputWriter: ({ dependencies }) => {
         dependencies; // $ExpectType Dependency[]
         return dependencies.map(d => `${d.name} - v${d.version} - ${d.author}\n${d.licenseName}`).join("\n");
     },
 });
 
+// $ExpectType LicenseCheckerWebpackPlugin
+new LicenseCheckerWebpackPlugin({
+    // $ExpectType ({ dependencies }: OutputWriterArgs) => Promise<string>
+    outputWriter: async ({ dependencies }) => {
+        return dependencies.map(d => d.name).join("\n");
+    },
+});
+
 // $ExpectType LicenseCheckerWebpackPlugin
 new LicenseCheckerWebpackPlugin();