diff --git a/src/Core/Files.ts b/src/Core/Files.ts
index cb5a55b..93b7498 100644
--- a/src/Core/Files.ts
+++ b/src/Core/Files.ts
@@ -1,14 +1,9 @@
 import * as fs from 'fs'
 import * as path from 'path'
 
+import { IFiles, Stat } from './Interfaces'
 import { Log, Logger } from './Logger'
 
-export interface Stat {
-  dir: boolean
-  file: boolean
-  filename: string
-}
-
 class InternalFiles {
   private readonly log: Log = Logger('chest:files')
 
@@ -145,23 +140,4 @@ class InternalFiles {
   }
 }
 
-export interface Files {
-  basename(filepath: string): string
-  deepdirs(rootpath: string): Promise<string[]>
-  deepfiles(rootpath: string): Promise<string[]>
-  exists(filepath: string): Promise<boolean>
-  ext(filepath: string): string
-  extensionless(filename: string): string
-  join(...args: string[]): string
-  json<T>(filepath: string): Promise<T>
-  readfile(filepath: string): Promise<Buffer>
-  listdirs(filepath: string): Promise<string[]>
-  listfiles(filepath: string): Promise<string[]>
-  mkdir(filepath: string): Promise<void>
-  save<T>(filepath: string, data: T): Promise<void>
-  statfile(filepath: string): Promise<fs.Stats>
-  statfiles(filepath: string): Promise<Stat[]>
-  writefile(filepath: string, data: any): Promise<void>
-}
-
-export const Files: Files = new InternalFiles()
+export const Files: IFiles = new InternalFiles()
diff --git a/src/Core/Interfaces/IFiles.ts b/src/Core/Interfaces/IFiles.ts
new file mode 100644
index 0000000..c6f754c
--- /dev/null
+++ b/src/Core/Interfaces/IFiles.ts
@@ -0,0 +1,22 @@
+import * as fs from 'fs'
+
+import { Stat } from './Stat'
+
+export interface IFiles {
+  basename(filepath: string): string
+  deepdirs(rootpath: string): Promise<string[]>
+  deepfiles(rootpath: string): Promise<string[]>
+  exists(filepath: string): Promise<boolean>
+  ext(filepath: string): string
+  extensionless(filename: string): string
+  join(...args: string[]): string
+  json<T>(filepath: string): Promise<T>
+  readfile(filepath: string): Promise<Buffer>
+  listdirs(filepath: string): Promise<string[]>
+  listfiles(filepath: string): Promise<string[]>
+  mkdir(filepath: string): Promise<void>
+  save<T>(filepath: string, data: T): Promise<void>
+  statfile(filepath: string): Promise<fs.Stats>
+  statfiles(filepath: string): Promise<Stat[]>
+  writefile(filepath: string, data: any): Promise<void>
+}
diff --git a/src/Core/Interfaces/Stat.ts b/src/Core/Interfaces/Stat.ts
new file mode 100644
index 0000000..fe92b09
--- /dev/null
+++ b/src/Core/Interfaces/Stat.ts
@@ -0,0 +1,5 @@
+export interface Stat {
+  dir: boolean
+  file: boolean
+  filename: string
+}
diff --git a/src/Core/Interfaces/index.ts b/src/Core/Interfaces/index.ts
index 4357c8c..02eaf13 100644
--- a/src/Core/Interfaces/index.ts
+++ b/src/Core/Interfaces/index.ts
@@ -1,5 +1,7 @@
 export * from './Dictionary'
+export * from './IFiles'
 export * from './LernaConfig'
 export * from './NPM'
+export * from './Stat'
 export * from './TypeScriptConfig'
 export * from './Updater'