Switch to fs/promises

Author: artnc

entry.ts

@@ -1,7 +1,8 @@
 #!/usr/bin/env node
 
 import { exec } from "child_process";
-import { createReadStream, readFile, writeFile } from "fs";
+import { createReadStream } from "fs";
+import { readFile, writeFile } from "fs/promises";
 import { createInterface } from "readline";
 
 /**
@@ -50,32 +51,19 @@ const run = (...args: string[]) =>
 export const isTruthy = <T>(value: T): value is NonNullable<T> => !!value;
 
 /** Reads a file, transforms its contents, and writes the result if different */
-const transformFile = (path: string, transform: (before: string) => string) =>
-  new Promise<void>((resolve, reject) => {
-    readFile(path, "utf8", (err, data) => {
-      // File unreadable
-      if (err) {
-        reject(err);
-        return;
-      }
-
-      // File empty
-      if (data === "") {
-        resolve();
-        return;
-      }
-
-      // File unmodified
-      const after = transform(data);
-      if (data === after) {
-        resolve();
-        return;
-      }
-
-      // File modified
-      writeFile(path, after, "utf8", err => (err ? reject(err) : resolve()));
-    });
-  });
+const transformFile = async (
+  path: string,
+  transform: (before: string) => string,
+) => {
+  const data = await readFile(path, "utf8");
+  if (data === "") {
+    return;
+  }
+  const after = transform(data);
+  if (data !== after) {
+    await writeFile(path, after, "utf8");
+  }
+};
 
 const enum HookName {
   Autoflake = "autoflake",