1 files changed, 15 insertions, 0 deletions
diff --git a/packages/sol-compiler/src/utils/fs_wrapper.ts b/packages/sol-compiler/src/utils/fs_wrapper.ts
index cc7b06175..8d6800276 100644
--- a/packages/sol-compiler/src/utils/fs_wrapper.ts
+++ b/packages/sol-compiler/src/utils/fs_wrapper.ts
@@ -10,4 +10,19 @@ export const fsWrapper = {
     doesPathExistSync: fs.existsSync,
     rmdirSync: fs.rmdirSync,
     removeFileAsync: promisify<undefined>(fs.unlink),
+    statAsync: promisify<fs.Stats>(fs.stat),
+    appendFileAsync: promisify<undefined>(fs.appendFile),
+    accessAsync: promisify<boolean>(fs.access),
+    doesFileExistAsync: async (filePath: string): Promise<boolean> => {
+        try {
+            await fsWrapper.accessAsync(
+                filePath,
+                // node says we need to use bitwise, but tslint says no:
+                fs.constants.F_OK | fs.constants.R_OK, // tslint:disable-line:no-bitwise
+            );
+        } catch (err) {
+            return false;
+        }
+        return true;
+    },
 };