diff --git a/src/commands/project/delete/source.ts b/src/commands/project/delete/source.ts
index cce7691b..9dcb0d1c 100644
--- a/src/commands/project/delete/source.ts
+++ b/src/commands/project/delete/source.ts
@@ -402,7 +402,7 @@ export class Source extends SfCommand<DeleteSourceJson> {
           // for custom labels, print each custom label to be deleted, not the whole file
           isNonDecomposedCustomLabelsOrCustomLabel(c)
             ? [`${c.type.name}:${c.fullName}`]
-            : [c.xml as string, ...c.walkContent()] ?? []
+            : [c.xml, ...c.walkContent()] ?? []
         )
         .concat(this.mixedDeployDelete.delete.map((fr) => `${fr.fullName} (${fr.filePath})`));
 
diff --git a/src/utils/previewOutput.ts b/src/utils/previewOutput.ts
index 07f2375e..3b4ba526 100644
--- a/src/utils/previewOutput.ts
+++ b/src/utils/previewOutput.ts
@@ -66,7 +66,7 @@ const resolvePaths = (
         return resolver.getComponentsFromPath(filename);
       } catch (e) {
         // resolver will do logging before throw we don't do it here
-        return undefined;
+        return [];
       }
     })
     .filter(isSourceComponentWithXml)
diff --git a/src/utils/types.ts b/src/utils/types.ts
index 1f7ce6c5..6f37978f 100644
--- a/src/utils/types.ts
+++ b/src/utils/types.ts
@@ -14,6 +14,7 @@ import {
   SourceComponent,
   FileResponseFailure,
   FileResponseSuccess,
+  ComponentLike,
 } from '@salesforce/source-deploy-retrieve';
 import { isObject } from '@salesforce/ts-types';
 import { DefaultReportOptions } from '@salesforce/apex-node';
@@ -89,7 +90,7 @@ export type Formatter<T> = {
 };
 
 /** validates source component with fullname, type, and xml props */
-export const isSourceComponent = (sc: unknown): sc is SourceComponent =>
+export const isSourceComponent = (sc: ComponentLike): sc is SourceComponent =>
   isObject(sc) &&
   'type' in sc &&
   typeof sc.type === 'object' &&
@@ -97,10 +98,11 @@ export const isSourceComponent = (sc: unknown): sc is SourceComponent =>
   'name' in sc.type &&
   typeof sc.type.name === 'string' &&
   'fullName' in sc &&
+  'walkContent' in sc &&
   // (typeof sc.fullName === 'string' || typeof sc.fullName === 'function');
   typeof sc.fullName === 'string';
 
-export const isSourceComponentWithXml = (sc: unknown): sc is SourceComponent & { xml: string } =>
+export const isSourceComponentWithXml = (sc: ComponentLike): sc is SourceComponent & { xml: string } =>
   isSourceComponent(sc) && 'xml' in sc && typeof sc.xml === 'string';
 
 export const isSdrFailure = (fileResponse: FileResponse): fileResponse is FileResponseFailure =>
@@ -111,3 +113,5 @@ export const isSdrSuccess = (fileResponse: FileResponse): fileResponse is FileRe
 
 export const isFileResponseDeleted = (fileResponse: FileResponseSuccess): boolean =>
   fileResponse.state === ComponentStatus.Deleted;
+
+export const isDefined = <T>(value?: T): value is T => value !== undefined;
diff --git a/test/utils/types.test.ts b/test/utils/types.test.ts
index 94e62c26..40e17f6e 100644
--- a/test/utils/types.test.ts
+++ b/test/utils/types.test.ts
@@ -16,9 +16,6 @@ const type = reg.getTypeByName('ApexClass');
 
 describe('isSourceComponent (type guard)', () => {
   describe('good', () => {
-    it('full, correct definition', () => {
-      expect({ fullName: 'foo', type, xml: 'fooXml', content: 'fooContent' }).to.satisfy(isSourceComponent);
-    });
     it('SC constructed with xml', () => {
       expect(new SourceComponent({ name: 'foo', type, xml: 'classes/foo.cls' })).to.satisfy(isSourceComponent);
     });
@@ -45,9 +42,6 @@ describe('isSourceComponent (type guard)', () => {
 
 describe('isSourceComponentWithXml (type guard)', () => {
   describe('good', () => {
-    it('full, correct definition', () => {
-      expect({ fullName: 'foo', type, xml: 'fooXml', content: 'fooContent' }).to.satisfy(isSourceComponentWithXml);
-    });
     it('SC constructed with xml', () => {
       expect(new SourceComponent({ name: 'foo', type, xml: 'classes/foo.cls' })).to.satisfy(isSourceComponentWithXml);
     });