Enforce type checking on babel-{cli,node}

lib/fs-readdir-recursive.d.ts

@@ -0,0 +1,7 @@
+declare module "fs-readdir-recursive" {
+  function read(
+    root: string,
+    filter?: (filename: string, index: number, dir: string) => boolean
+  ): string[];
+  export = read;
+}

lib/kexec.d.ts

@@ -0,0 +1,4 @@
+declare module "kexec" {
+  function execvp(cmd: string, args: string[]): string;
+  export = execvp;
+}

lib/slash.d.ts

@@ -0,0 +1,4 @@
+declare module "slash" {
+  function slash(path: string): string;
+  export = slash;
+}

packages/babel-cli/src/babel/dir.ts

@@ -1,4 +1,3 @@
-// @ts-expect-error
 import slash from "slash";
 import path from "path";
 import fs from "fs";

packages/babel-cli/src/babel/file.ts

@@ -1,7 +1,6 @@
 import convertSourceMap from "convert-source-map";
 import { AnyMap, encodedMap } from "@jridgewell/trace-mapping";
 import type { Section } from "@jridgewell/trace-mapping/dist/types/types";
-// @ts-expect-error
 import slash from "slash";
 import path from "path";
 import fs from "fs";

packages/babel-cli/src/babel/util.ts

@@ -1,4 +1,3 @@
-// @ts-expect-error
 import readdirRecursive from "fs-readdir-recursive";
 import * as babel from "@babel/core";
 import path from "path";
@@ -21,19 +20,15 @@ export function readdir(
   includeDotfiles: boolean,
   filter?: ReaddirFilter,
 ): Array<string> {
-  return readdirRecursive(
-    dirname,
-    (filename: string, index: number, currentDirectory: string) => {
-      const stat = fs.statSync(path.join(currentDirectory, filename));
-
-      if (stat.isDirectory()) return true;
-
-      return (
-        (includeDotfiles || filename[0] !== ".") &&
-        (!filter || filter(filename))
-      );
-    },
-  );
+  return readdirRecursive(dirname, (filename, index, currentDirectory) => {
+    const stat = fs.statSync(path.join(currentDirectory, filename));
+
+    if (stat.isDirectory()) return true;
+
+    return (
+      (includeDotfiles || filename[0] !== ".") && (!filter || filter(filename))
+    );
+  });
 }
 
 export function readdirForCompilable(

packages/babel-cli/src/babel/watcher.ts

@@ -15,15 +15,16 @@ export function enable({ enableGlobbing }: { enableGlobbing: boolean }) {
 
   const { FSWatcher } = requireChokidar();
 
-  watcher = new FSWatcher({
+  const options: WatchOptions = {
     disableGlobbing: !enableGlobbing,
     persistent: true,
     ignoreInitial: true,
     awaitWriteFinish: {
       stabilityThreshold: 50,
       pollInterval: 10,
     },
-  } as WatchOptions);
+  };
+  watcher = new FSWatcher(options);
 
   watcher.on("unlink", unwatchFile);
 }

packages/babel-node/src/babel-node.ts

@@ -73,7 +73,6 @@ getV8Flags(async function (err, v8Flags) {
   }
 
   try {
-    // @ts-expect-error
     const { default: kexec } = await import("kexec");
     kexec(process.argv[0], args);
   } catch (err) {

scripts/generators/tsconfig.js

@@ -129,6 +129,9 @@ fs.writeFileSync(
               "to-fast-properties",
               ["./node_modules/to-fast-properties-BABEL_8_BREAKING-true"],
             ],
+            ["slash", ["./lib/slash.d.ts"]],
+            ["fs-readdir-recursive", ["./lib/fs-readdir-recursive.d.ts"]],
+            ["kexec", ["./lib/kexec.d.ts"]],
           ]),
         },
       },

tsconfig.json

@@ -718,6 +718,15 @@
       ],
       "to-fast-properties": [
         "./node_modules/to-fast-properties-BABEL_8_BREAKING-true"
+      ],
+      "slash": [
+        "./lib/slash.d.ts"
+      ],
+      "fs-readdir-recursive": [
+        "./lib/fs-readdir-recursive.d.ts"
+      ],
+      "kexec": [
+        "./lib/kexec.d.ts"
       ]
     }
   }