Refactor filter() type inference (#1305)

Author: Kesin11

src/custom_report_collection.ts

@@ -51,7 +51,7 @@ export const createCustomReportCollection = async (
           ...data,
         } as CustomReport;
       })
-      .filter((report): report is CustomReport => report !== undefined);
+      .filter((report) => report !== undefined);
 
     reportCollection.set(reportName, reports);
   }

src/exporter/exporter.ts

@@ -56,10 +56,7 @@ export class CompositExporter implements Exporter {
             return new BigqueryExporter(logger, _config, options.configDir);
         }
       })
-      .filter(
-        (exporter): exporter is NonNullable<typeof exporter> =>
-          exporter !== undefined,
-      );
+      .filter((exporter) => exporter !== undefined);
   }
 
   async exportWorkflowReports(reports: WorkflowReport[]) {

src/runner/runner.ts

@@ -44,9 +44,7 @@ export class CompositRunner implements Runner {
             return undefined;
         }
       })
-      .filter(
-        (runner): runner is NonNullable<typeof runner> => runner !== undefined,
-      );
+      .filter((runner) => runner !== undefined);
   }
 
   async run(): Promise<Result<unknown, Error>> {