fs: move constants to internal/fs/utils.js

lib/fs.js

@@ -24,10 +24,6 @@
 
 'use strict';
 
-// Most platforms don't allow reads or writes >= 2 GB.
-// See https://github.com/libuv/libuv/pull/1501.
-const kIoMaxLength = 2 ** 31 - 1;
-
 // When using FSReqCallback, make sure to create the object only *after* all
 // parameter validation has happened, so that the objects are not kept in memory
 // in case they are created but never used due to an exception.
@@ -90,6 +86,10 @@ const { FSReqCallback } = binding;
 const { toPathIfFileURL } = require('internal/url');
 const internalUtil = require('internal/util');
 const {
+  constants: {
+    kIoMaxLength,
+    kMaxUserId,
+  },
   copyObject,
   Dirent,
   emitRecursiveRmdirWarning,
@@ -136,8 +136,6 @@ const {
   validateFunction,
   validateInteger,
 } = require('internal/validators');
-// 2 ** 32 - 1
-const kMaxUserId = 4294967295;
 
 let truncateWarn = true;
 let fs;

lib/internal/fs/promises.js

@@ -1,16 +1,5 @@
 'use strict';
 
-// Most platforms don't allow reads or writes >= 2 GB.
-// See https://github.com/libuv/libuv/pull/1501.
-const kIoMaxLength = 2 ** 31 - 1;
-
-const kReadFileBufferLength = 512 * 1024;
-const kReadFileUnknownBufferLength = 64 * 1024;
-const kWriteFileMaxChunkSize = 512 * 1024;
-
-// 2 ** 32 - 1
-const kMaxUserId = 4294967295;
-
 const {
   ArrayPrototypePush,
   Error,
@@ -48,6 +37,13 @@ const {
 const { isArrayBufferView } = require('internal/util/types');
 const { rimrafPromises } = require('internal/fs/rimraf');
 const {
+  constants: {
+    kIoMaxLength,
+    kMaxUserId,
+    kReadFileBufferLength,
+    kReadFileUnknownBufferLength,
+    kWriteFileMaxChunkSize,
+  },
   copyObject,
   emitRecursiveRmdirWarning,
   getDirents,

lib/internal/fs/read_file_context.js

@@ -6,6 +6,13 @@ const {
   ReflectApply,
 } = primordials;
 
+const {
+  constants: {
+    kReadFileBufferLength,
+    kReadFileUnknownBufferLength,
+  }
+} = require('internal/fs/utils');
+
 const { Buffer } = require('buffer');
 
 const { FSReqCallback, close, read } = internalBinding('fs');
@@ -15,15 +22,6 @@ const {
   aggregateTwoErrors,
 } = require('internal/errors');
 
-// Use 64kb in case the file type is not a regular file and thus do not know the
-// actual file size. Increasing the value further results in more frequent over
-// allocation for small files and consumes CPU time and memory that should be
-// used else wise.
-// Use up to 512kb per read otherwise to partition reading big files to prevent
-// blocking other threads in case the available threads are all in use.
-const kReadFileUnknownBufferLength = 64 * 1024;
-const kReadFileBufferLength = 512 * 1024;
-
 function readFileAfterRead(err, bytesRead) {
   const context = this.context;
 

lib/internal/fs/utils.js

@@ -120,6 +120,23 @@ const kMaximumCopyMode = COPYFILE_EXCL |
                          COPYFILE_FICLONE |
                          COPYFILE_FICLONE_FORCE;
 
+// Most platforms don't allow reads or writes >= 2 GB.
+// See https://github.com/libuv/libuv/pull/1501.
+const kIoMaxLength = 2 ** 31 - 1;
+
+// Use 64kb in case the file type is not a regular file and thus do not know the
+// actual file size. Increasing the value further results in more frequent over
+// allocation for small files and consumes CPU time and memory that should be
+// used else wise.
+// Use up to 512kb per read otherwise to partition reading big files to prevent
+// blocking other threads in case the available threads are all in use.
+const kReadFileUnknownBufferLength = 64 * 1024;
+const kReadFileBufferLength = 512 * 1024;
+
+const kWriteFileMaxChunkSize = 512 * 1024;
+
+const kMaxUserId = 2 ** 32 - 1;
+
 const isWindows = process.platform === 'win32';
 
 let fs;
@@ -843,6 +860,13 @@ const validatePosition = hideStackFrames((position, name) => {
 });
 
 module.exports = {
+  constants: {
+    kIoMaxLength,
+    kMaxUserId,
+    kReadFileBufferLength,
+    kReadFileUnknownBufferLength,
+    kWriteFileMaxChunkSize,
+  },
   assertEncoding,
   BigIntStats,  // for testing
   copyObject,