diff --git a/packages/cli/src/services/check-parser/package-files/resolver.ts b/packages/cli/src/services/check-parser/package-files/resolver.ts
index ab7dfbe9..a6a02236 100644
--- a/packages/cli/src/services/check-parser/package-files/resolver.ts
+++ b/packages/cli/src/services/check-parser/package-files/resolver.ts
@@ -52,6 +52,13 @@ class PackageFiles {
   }
 }
 
+type TSConfigFileLocalDependency = {
+  kind: 'tsconfig-file'
+  importPath: string
+  sourceFile: SourceFile
+  configFile: TSConfigFile
+}
+
 type TSConfigResolvedPathLocalDependency = {
   kind: 'tsconfig-resolved-path'
   importPath: string
@@ -80,6 +87,7 @@ type RelativePathLocalDependency = {
 }
 
 type LocalDependency =
+  TSConfigFileLocalDependency |
   TSConfigResolvedPathLocalDependency |
   TSConfigBaseUrlRelativePathLocalDependency |
   PackageRelativePathLocalDependency |
@@ -163,7 +171,9 @@ export class PackageFilesResolver {
               continue
             }
 
-            return [sourceFile, mainSourceFile]
+            configJson.registerRelatedSourceFile(mainSourceFile)
+
+            return [sourceFile, mainSourceFile, configJson.jsonFile.sourceFile]
           }
         }
 
@@ -239,6 +249,7 @@ export class PackageFilesResolver {
             if (sourceFile !== undefined) {
               const resolvedFiles = this.resolveSourceFile(sourceFile)
               for (const resolvedFile of resolvedFiles) {
+                configJson.registerRelatedSourceFile(resolvedFile)
                 resolved.local.push({
                   kind: 'tsconfig-resolved-path',
                   importPath,
@@ -249,6 +260,12 @@ export class PackageFilesResolver {
                     target,
                   },
                 })
+                resolved.local.push({
+                  kind: 'tsconfig-file',
+                  importPath,
+                  sourceFile: configJson.jsonFile.sourceFile,
+                  configFile: configJson,
+                })
                 found = true
               }
               if (found) {
@@ -270,12 +287,19 @@ export class PackageFilesResolver {
             const resolvedFiles = this.resolveSourceFile(sourceFile)
             let found = false
             for (const resolvedFile of resolvedFiles) {
+              configJson.registerRelatedSourceFile(resolvedFile)
               resolved.local.push({
                 kind: 'tsconfig-baseurl-relative-path',
                 importPath,
                 sourceFile: resolvedFile,
                 configFile: configJson,
               })
+              resolved.local.push({
+                kind: 'tsconfig-file',
+                importPath,
+                sourceFile: configJson.jsonFile.sourceFile,
+                configFile: configJson,
+              })
               found = true
             }
             if (found) {
diff --git a/packages/cli/src/services/check-parser/package-files/tsconfig-json-file.ts b/packages/cli/src/services/check-parser/package-files/tsconfig-json-file.ts
index 17858e1a..e709d73e 100644
--- a/packages/cli/src/services/check-parser/package-files/tsconfig-json-file.ts
+++ b/packages/cli/src/services/check-parser/package-files/tsconfig-json-file.ts
@@ -1,5 +1,6 @@
 import path from 'node:path'
 
+import { SourceFile } from './source-file'
 import { JsonSourceFile } from './json-source-file'
 import { PathResolver, ResolveResult } from './paths'
 import type { LoadFile } from './loader'
@@ -90,6 +91,8 @@ export class TSConfigFile {
   baseUrl?: string
   pathResolver: PathResolver
 
+  relatedSourceFiles: SourceFile[] = []
+
   protected constructor (jsonFile: JsonSourceFile<Schema>) {
     this.jsonFile = jsonFile
 
@@ -215,4 +218,8 @@ export class TSConfigFile {
 
     return this.extifyLookupPaths(candidates)
   }
+
+  registerRelatedSourceFile (file: SourceFile) {
+    this.relatedSourceFiles.push(file)
+  }
 }
diff --git a/packages/cli/src/services/check-parser/parser.ts b/packages/cli/src/services/check-parser/parser.ts
index 3adde25b..1ecc2abc 100644
--- a/packages/cli/src/services/check-parser/parser.ts
+++ b/packages/cli/src/services/check-parser/parser.ts
@@ -188,6 +188,8 @@ export class Parser {
         // This doesn't actually cause problems (both are "ESTree's"), but we need to ignore type errors here.
         // @ts-ignore
         walk.simple(ast, Parser.tsNodeVisitor(tsParser, dependencies))
+      } else if (extension === '.json') {
+        // No dependencies to check.
       } else {
         throw new Error(`Unsupported file extension for ${filePath}`)
       }