lib: load internal/fs/watchers and internal/fs/read_file_context early

So that they are included in the builtin snapshot

PR-URL: #38737
Refs: #35711
Reviewed-By: Anna Henningsen <[email protected]>

Author: joyeecheung

lib/fs.js

@@ -138,13 +138,14 @@ const {
   validateInteger,
 } = require('internal/validators');
 
+const watchers = require('internal/fs/watchers');
+const ReadFileContext = require('internal/fs/read_file_context');
+
 let truncateWarn = true;
 let fs;
 
 // Lazy loaded
 let promises = null;
-let watchers;
-let ReadFileContext;
 let ReadStream;
 let WriteStream;
 let rimraf;
@@ -369,8 +370,6 @@ function checkAborted(signal, callback) {
 function readFile(path, options, callback) {
   callback = maybeCallback(callback || options);
   options = getOptions(options, { flag: 'r' });
-  if (!ReadFileContext)
-    ReadFileContext = require('internal/fs/read_file_context');
   const context = new ReadFileContext(callback, options.encoding);
   context.isUserFd = isFd(path); // File descriptor ownership
 
@@ -2234,8 +2233,6 @@ function watch(filename, options, listener) {
   if (options.recursive === undefined) options.recursive = false;
   if (options.recursive && !(isOSX || isWindows))
     throw new ERR_FEATURE_UNAVAILABLE_ON_PLATFORM('watch recursively');
-  if (!watchers)
-    watchers = require('internal/fs/watchers');
   const watcher = new watchers.FSWatcher();
   watcher[watchers.kFSWatchStart](filename,
                                   options.persistent,
@@ -2301,8 +2298,6 @@ function watchFile(filename, options, listener) {
   stat = statWatchers.get(filename);
 
   if (stat === undefined) {
-    if (!watchers)
-      watchers = require('internal/fs/watchers');
     stat = new watchers.StatWatcher(options.bigint);
     stat[watchers.kFSStatWatcherStart](filename,
                                        options.persistent, options.interval);

test/parallel/test-bootstrap-modules.js

@@ -56,6 +56,7 @@ const expectedModules = new Set([
   'NativeModule internal/fs/dir',
   'NativeModule internal/fs/utils',
   'NativeModule internal/fs/promises',
+  'NativeModule internal/fs/read_file_context',
   'NativeModule internal/fs/rimraf',
   'NativeModule internal/fs/watchers',
   'NativeModule internal/heap_utils',