feat: special error for too many vuln paths

src/lib/errors/index.ts

@@ -12,3 +12,4 @@ export {FailedToGetVulnerabilitiesError} from './failed-to-get-vulnerabilities-e
 export {UnsupportedFeatureFlagError} from './unsupported-feature-flag-error';
 export {UnsupportedPackageManagerError} from './unsupported-package-manager-error';
 export {FailedToRunTestError} from './failed-to-run-test-error';
+export {TooManyVulnPaths} from './too-many-vuln-paths';

src/lib/errors/too-many-vuln-paths.ts

@@ -0,0 +1,14 @@
+import {CustomError} from './custom-error';
+
+export class TooManyVulnPaths extends CustomError {
+  private static ERROR_CODE: number = 413;
+  private static ERROR_STRING_CODE: string = 'TOO_MANY_VULN_PATHS';
+  private static ERROR_MESSAGE: string = 'Too many vulnerable paths to process the project';
+
+  constructor() {
+    super(TooManyVulnPaths.ERROR_MESSAGE);
+    this.code = TooManyVulnPaths.ERROR_CODE;
+    this.strCode = TooManyVulnPaths.ERROR_STRING_CODE;
+    this.userMessage = TooManyVulnPaths.ERROR_MESSAGE;
+  }
+}

src/lib/prune.ts

@@ -3,6 +3,7 @@ import { DepGraph, legacy } from '@snyk/dep-graph';
 
 import { DepTree } from './types';
 import * as config from './config';
+import { TooManyVulnPaths } from './errors';
 import { SupportedPackageManagers } from './package-managers';
 
 const debug = _debug('snyk:prune');
@@ -35,7 +36,7 @@ export async function pruneGraph(
     }
 
     debug('Too many vulnerable paths to process the project');
-    throw new Error('Too many vulnerable paths to process the project');
+    throw new TooManyVulnPaths();
   } catch (e) {
     debug('Failed to prune the graph, returning original: ' + e);
     return depGraph;