fs: move fs/promises to fs.promises

PR-URL: #20504
Refs: nodejs/TSC#389
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Shingo Inoue <leko.noor@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>

benchmark/fs/bench-stat-promise.js

@@ -1,7 +1,7 @@
 'use strict';
 
 const common = require('../common');
-const fsPromises = require('fs/promises');
+const fsPromises = require('fs').promises;
 
 const bench = common.createBenchmark(main, {
   n: [20e4],

doc/api/fs.md

@@ -3382,9 +3382,9 @@ Synchronous versions of [`fs.write()`][]. Returns the number of bytes written.
 
 > Stability: 1 - Experimental
 
-The `fs/promises` API provides an alternative set of asynchronous file system
+The `fs.promises` API provides an alternative set of asynchronous file system
 methods that return `Promise` objects rather than using callbacks. The
-API is accessible via `require('fs/promises')`.
+API is accessible via `require('fs').promises`.
 
 ### class: FileHandle
 <!-- YAML

lib/fs.js

@@ -45,7 +45,8 @@ const { Readable, Writable } = require('stream');
 const EventEmitter = require('events');
 const { FSReqWrap, statValues, kFsStatsFieldsLength } = binding;
 const { FSEvent } = process.binding('fs_event_wrap');
-const internalFS = require('internal/fs');
+const promises = require('internal/fs/promises');
+const internalFS = require('internal/fs/utils');
 const { getPathFromURL } = require('internal/url');
 const internalUtil = require('internal/util');
 const {
@@ -72,6 +73,21 @@ const {
   CHAR_BACKWARD_SLASH,
 } = require('internal/constants');
 
+let warn = true;
+
+Object.defineProperty(fs, 'promises', {
+  configurable: true,
+  enumerable: true,
+  get() {
+    if (warn) {
+      warn = false;
+      process.emitWarning('The fs.promises API is experimental',
+                          'ExperimentalWarning');
+    }
+    return promises;
+  }
+});
+
 Object.defineProperty(exports, 'constants', {
   configurable: false,
   enumerable: true,

lib/fs/promises.js → lib/internal/fs/promises.js

@@ -1,8 +1,5 @@
 'use strict';
 
-process.emitWarning('The fs/promises API is experimental',
-                    'ExperimentalWarning');
-
 const {
   F_OK,
   O_SYMLINK,
@@ -37,7 +34,7 @@ const {
   validateOffsetLengthWrite,
   validatePath,
   validateUint32
-} = require('internal/fs');
+} = require('internal/fs/utils');
 const pathModule = require('path');
 
 const kHandle = Symbol('handle');

lib/internal/modules/cjs/loader.js

@@ -28,7 +28,7 @@ const { getURLFromFilePath } = require('internal/url');
 const vm = require('vm');
 const assert = require('assert').ok;
 const fs = require('fs');
-const internalFS = require('internal/fs');
+const internalFS = require('internal/fs/utils');
 const path = require('path');
 const {
   internalModuleReadJSON,

lib/internal/modules/esm/default_resolve.js

@@ -2,7 +2,7 @@
 
 const { URL } = require('url');
 const CJSmodule = require('internal/modules/cjs/loader');
-const internalFS = require('internal/fs');
+const internalFS = require('internal/fs/utils');
 const { NativeModule, internalBinding } = require('internal/bootstrap/loaders');
 const { extname } = require('path');
 const { realpathSync } = require('fs');

lib/internal/process/stdio.js

@@ -158,7 +158,7 @@ function createWritableStdioStream(fd) {
       break;
 
     case 'FILE':
-      var fs = require('internal/fs');
+      var fs = require('internal/fs/utils');
       stream = new fs.SyncWriteStream(fd, { autoClose: false });
       stream._type = 'fs';
       break;

node.gyp

@@ -39,7 +39,6 @@
       'lib/domain.js',
       'lib/events.js',
       'lib/fs.js',
-      'lib/fs/promises.js',
       'lib/http.js',
       'lib/http2.js',
       'lib/_http_agent.js',
@@ -103,7 +102,8 @@
       'lib/internal/errors.js',
       'lib/internal/fixed_queue.js',
       'lib/internal/freelist.js',
-      'lib/internal/fs.js',
+      'lib/internal/fs/promises.js',
+      'lib/internal/fs/utils.js',
       'lib/internal/http.js',
       'lib/internal/inspector_async_hook.js',
       'lib/internal/linkedlist.js',

test/parallel/test-fs-filehandle.js

@@ -5,7 +5,7 @@ const common = require('../common');
 const assert = require('assert');
 const path = require('path');
 const fs = process.binding('fs');
-const { stringToFlags } = require('internal/fs');
+const { stringToFlags } = require('internal/fs/utils');
 
 // Verifies that the FileHandle object is garbage collected and that a
 // warning is emitted if it is not closed.

test/parallel/test-fs-open-flags.js

@@ -39,7 +39,7 @@ const O_DSYNC = fs.constants.O_DSYNC || 0;
 const O_TRUNC = fs.constants.O_TRUNC || 0;
 const O_WRONLY = fs.constants.O_WRONLY || 0;
 
-const { stringToFlags } = require('internal/fs');
+const { stringToFlags } = require('internal/fs/utils');
 
 assert.strictEqual(stringToFlags('r'), O_RDONLY);
 assert.strictEqual(stringToFlags('r+'), O_RDWR);

test/parallel/test-fs-promises-file-handle-append-file.js

@@ -2,11 +2,11 @@
 
 const common = require('../common');
 
-// The following tests validate base functionality for the fs/promises
+// The following tests validate base functionality for the fs.promises
 // FileHandle.appendFile method.
 
 const fs = require('fs');
-const { open } = require('fs/promises');
+const { open } = fs.promises;
 const path = require('path');
 const tmpdir = require('../common/tmpdir');
 const assert = require('assert');

test/parallel/test-fs-promises-file-handle-chmod.js

@@ -2,11 +2,11 @@
 
 const common = require('../common');
 
-// The following tests validate base functionality for the fs/promises
+// The following tests validate base functionality for the fs.promises
 // FileHandle.chmod method.
 
 const fs = require('fs');
-const { open } = require('fs/promises');
+const { open } = fs.promises;
 const path = require('path');
 const tmpdir = require('../common/tmpdir');
 const assert = require('assert');

test/parallel/test-fs-promises-file-handle-read.js

@@ -2,11 +2,11 @@
 
 const common = require('../common');
 
-// The following tests validate base functionality for the fs/promises
+// The following tests validate base functionality for the fs.promises
 // FileHandle.read method.
 
 const fs = require('fs');
-const { open } = require('fs/promises');
+const { open } = fs.promises;
 const path = require('path');
 const tmpdir = require('../common/tmpdir');
 const assert = require('assert');

test/parallel/test-fs-promises-file-handle-readFile.js

@@ -2,11 +2,11 @@
 
 const common = require('../common');
 
-// The following tests validate base functionality for the fs/promises
+// The following tests validate base functionality for the fs.promises
 // FileHandle.readFile method.
 
 const fs = require('fs');
-const { open } = require('fs/promises');
+const { open } = fs.promises;
 const path = require('path');
 const tmpdir = require('../common/tmpdir');
 const assert = require('assert');

test/parallel/test-fs-promises-file-handle-stat.js

@@ -2,10 +2,10 @@
 
 const common = require('../common');
 
-// The following tests validate base functionality for the fs/promises
+// The following tests validate base functionality for the fs.promises
 // FileHandle.stat method.
 
-const { open } = require('fs/promises');
+const { open } = require('fs').promises;
 const path = require('path');
 const tmpdir = require('../common/tmpdir');
 const assert = require('assert');

test/parallel/test-fs-promises-file-handle-write.js

@@ -2,11 +2,11 @@
 
 const common = require('../common');
 
-// The following tests validate base functionality for the fs/promises
+// The following tests validate base functionality for the fs.promises
 // FileHandle.read method.
 
 const fs = require('fs');
-const { open } = require('fs/promises');
+const { open } = fs.promises;
 const path = require('path');
 const tmpdir = require('../common/tmpdir');
 const assert = require('assert');

test/parallel/test-fs-promises-file-handle-writeFile.js

@@ -2,11 +2,11 @@
 
 const common = require('../common');
 
-// The following tests validate base functionality for the fs/promises
+// The following tests validate base functionality for the fs.promises
 // FileHandle.readFile method.
 
 const fs = require('fs');
-const { open } = require('fs/promises');
+const { open } = fs.promises;
 const path = require('path');
 const tmpdir = require('../common/tmpdir');
 const assert = require('assert');

test/parallel/test-fs-promises-readfile.js

@@ -4,7 +4,7 @@ const common = require('../common');
 
 const assert = require('assert');
 const path = require('path');
-const { writeFile, readFile } = require('fs/promises');
+const { writeFile, readFile } = require('fs').promises;
 const tmpdir = require('../common/tmpdir');
 tmpdir.refresh();
 

test/parallel/test-fs-promises-writefile.js

@@ -2,7 +2,7 @@
 
 const common = require('../common');
 const fs = require('fs');
-const fsPromises = require('fs/promises');
+const fsPromises = fs.promises;
 const path = require('path');
 const tmpdir = require('../common/tmpdir');
 const assert = require('assert');

test/parallel/test-fs-promises.js

@@ -5,7 +5,7 @@ const assert = require('assert');
 const tmpdir = require('../common/tmpdir');
 const fixtures = require('../common/fixtures');
 const path = require('path');
-const fsPromises = require('fs/promises');
+const fsPromises = require('fs').promises;
 const {
   access,
   chmod,

test/parallel/test-fs-syncwritestream.js

@@ -6,8 +6,8 @@ const stream = require('stream');
 const fs = require('fs');
 const path = require('path');
 
-// require('internal/fs').SyncWriteStream is used as a stdio implementation
-// when stdout/stderr point to files.
+// require('internal/fs/utils').SyncWriteStream is used as a stdio
+// implementation when stdout/stderr point to files.
 
 if (process.argv[2] === 'child') {
   // Note: Calling console.log() is part of this test as it exercises the

test/parallel/test-internal-fs-syncwritestream.js

@@ -5,7 +5,7 @@ const common = require('../common');
 const assert = require('assert');
 const fs = require('fs');
 const path = require('path');
-const SyncWriteStream = require('internal/fs').SyncWriteStream;
+const SyncWriteStream = require('internal/fs/utils').SyncWriteStream;
 
 const tmpdir = require('../common/tmpdir');
 tmpdir.refresh();

test/parallel/test-internal-fs.js

@@ -2,7 +2,7 @@
 'use strict';
 
 const common = require('../common');
-const fs = require('internal/fs');
+const fs = require('internal/fs/utils');
 
 // Valid encodings and no args should not throw.
 fs.assertEncoding();

test/sequential/test-async-wrap-getasyncid.js

@@ -3,7 +3,7 @@
 const common = require('../common');
 const assert = require('assert');
 const fs = require('fs');
-const fsPromises = require('fs/promises');
+const fsPromises = fs.promises;
 const net = require('net');
 const providers = Object.assign({}, process.binding('async_wrap').Providers);
 const fixtures = require('../common/fixtures');