diff --git a/README.md b/README.md
index d9ad7ba..94475e6 100644
--- a/README.md
+++ b/README.md
@@ -121,6 +121,11 @@ Here are all the available options:
       <td>The output object tsc-alias will send logs to.</td>
       <td><code>new Output(options.verbose)</code></td>
     </tr>
+    <tr>
+      <td>fileExtensions</td>
+      <td>Overwrite file extensions tsc-alias will use to scan and resolve files.</td>
+      <td><code>undefined</code></td>
+    </tr>
   </tbody>
 </table>
 
@@ -143,6 +148,10 @@ Here are all the available options:
         "enabled": true,
         "file": "./otherReplacer.js"
       }
+    },
+    "fileExtensions": {
+      "inputGlob": "js,jsx,mjs",
+      "outputCheck": ["js", "json", "jsx", "mjs"]
     }
   }
 }
diff --git a/src/bin/index.ts b/src/bin/index.ts
index 0d12862..3c56599 100755
--- a/src/bin/index.ts
+++ b/src/bin/index.ts
@@ -24,6 +24,11 @@ program
   .option('-v, --verbose', 'Additional information is send to the terminal')
   .option('--debug', 'Debug information is send to the terminal')
   .option('-r, --replacer <replacers...>', 'path to optional extra replacer')
+  .option('--inputglob <glob>', 'Overwrite glob used for file scanning')
+  .option(
+    '--outputcheck <extensions...>',
+    'Overwrite file extensions used for path resolution'
+  )
   .parseAsync(process.argv);
 
 const options = program.opts();
@@ -35,5 +40,9 @@ replaceTscAliasPaths({
   verbose: !!options.verbose,
   debug: !!options.debug,
   resolveFullPaths: !!options.resolveFullPaths,
-  replacers: options.replacer
+  replacers: options.replacer,
+  fileExtensions: {
+    inputGlob: options.inputglob,
+    outputCheck: options.outputcheck
+  }
 });
diff --git a/src/helpers/config.ts b/src/helpers/config.ts
index 59145c7..c511a90 100644
--- a/src/helpers/config.ts
+++ b/src/helpers/config.ts
@@ -45,9 +45,12 @@ export async function prepareConfig(
     paths,
     replacers,
     resolveFullPaths,
-    verbose
+    verbose,
+    fileExtensions: fileExtensionsConfig
   } = loadConfig(configFile, output);
 
+  const fileExtensions = { ...fileExtensionsConfig, ...options.fileExtensions };
+
   output.verbose = verbose;
 
   if (options.resolveFullPaths || resolveFullPaths) {
@@ -75,7 +78,9 @@ export async function prepareConfig(
     hasExtraModule: false,
     configDirInOutPath: null,
     relConfDirPathInOutPath: null,
-    pathCache: new PathCache(!options.watch)
+    pathCache: new PathCache(!options.watch, fileExtensions?.outputCheck),
+    inputGlob:
+      fileExtensions?.inputGlob || '{mjs,cjs,js,jsx,d.{mts,cts,ts,tsx}}'
   };
   output.debug('loaded project config:', projectConfig);
 
@@ -133,6 +138,8 @@ export const loadConfig = (file: string, output: IOutput): ITSConfig => {
   if (TSCAliasConfig?.resolveFullPaths)
     config.resolveFullPaths = TSCAliasConfig.resolveFullPaths;
   if (TSCAliasConfig?.verbose) config.verbose = TSCAliasConfig.verbose;
+  if (TSCAliasConfig?.fileExtensions)
+    config.fileExtensions = TSCAliasConfig.fileExtensions;
 
   const replacerFile = config.replacers?.pathReplacer?.file;
 
diff --git a/src/index.ts b/src/index.ts
index 7bdcbc3..eeaadc3 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -45,7 +45,7 @@ export async function replaceTscAliasPaths(
   // Finding files and changing alias paths
   const posixOutput = config.outPath.replace(/\\/g, '/').replace(/\/+$/g, '');
   const globPattern = [
-    `${posixOutput}/**/*.{mjs,cjs,js,jsx,d.{mts,cts,ts,tsx}}`,
+    `${posixOutput}/**/*.${config.inputGlob}`,
     `!${posixOutput}/**/node_modules`
   ];
   output.debug('Search pattern:', globPattern);
diff --git a/src/interfaces.ts b/src/interfaces.ts
index 7891dc9..10b3c08 100644
--- a/src/interfaces.ts
+++ b/src/interfaces.ts
@@ -7,6 +7,7 @@ export interface IRawTSConfig {
     replacers?: ReplacerOptions;
     resolveFullPaths?: boolean;
     verbose?: boolean;
+    fileExtensions?: Partial<FileExtensions>;
   };
 }
 
@@ -16,6 +17,11 @@ export type PathLike = {
 
 export type StringReplacer = (importStatement: string) => string;
 
+export interface FileExtensions {
+  inputGlob: string;
+  outputCheck: string[];
+}
+
 export interface ITSConfig {
   baseUrl?: string;
   outDir?: string;
@@ -24,6 +30,7 @@ export interface ITSConfig {
   replacers?: ReplacerOptions;
   resolveFullPaths?: boolean;
   verbose?: boolean;
+  fileExtensions?: Partial<FileExtensions>;
 }
 
 export interface IProjectConfig {
@@ -37,6 +44,7 @@ export interface IProjectConfig {
   configDirInOutPath: string;
   relConfDirPathInOutPath: string;
   pathCache: PathCache;
+  inputGlob: string;
 }
 
 export interface IConfig extends IProjectConfig {
@@ -56,6 +64,7 @@ export interface ReplaceTscAliasPathsOptions {
   replacers?: string[];
   output?: IOutput;
   aliasTrie?: TrieNode<Alias>;
+  fileExtensions?: Partial<FileExtensions>;
 }
 
 export interface Alias {
diff --git a/src/utils/path-cache.ts b/src/utils/path-cache.ts
index 9f28014..8fd31f0 100644
--- a/src/utils/path-cache.ts
+++ b/src/utils/path-cache.ts
@@ -13,8 +13,20 @@ export class PathCache {
   useCache: boolean;
   existsCache: Map<string, boolean>;
   absoluteCache: Map<{ basePath: string; aliasPath: string }, string>;
+  fileExtensions: string[];
 
-  constructor(useCache: boolean) {
+  constructor(useCache: boolean, fileExtensions?: string[]) {
+    this.fileExtensions = fileExtensions || [
+      'js',
+      'json',
+      'jsx',
+      'cjs',
+      'mjs',
+      'd.ts',
+      'd.tsx',
+      'd.cts',
+      'd.mts'
+    ];
     this.useCache = useCache;
     if (useCache) {
       this.existsCache = new Map();
@@ -29,16 +41,10 @@ export class PathCache {
    */
   private exists(path: string): boolean {
     return (
-      existsSync(`${path}`) ||
-      existsSync(`${path}.js`) ||
-      existsSync(`${path}.json`) ||
-      existsSync(`${path}.jsx`) ||
-      existsSync(`${path}.cjs`) ||
-      existsSync(`${path}.mjs`) ||
-      existsSync(`${path}.d.ts`) ||
-      existsSync(`${path}.d.tsx`) ||
-      existsSync(`${path}.d.cts`) ||
-      existsSync(`${path}.d.mts`)
+      existsSync(path) ||
+      this.fileExtensions.some((extension) =>
+        existsSync(`${path}.${extension}`)
+      )
     );
   }