wasi: no longer require flag to enable wasi

- no longer require flag to enable experimental wasi feature
- wasi is still documented as experimental

Signed-off-by: Michael Dawson <mdawson@devrus.com>

PR-URL: #47286
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: mhdawson

doc/api/cli.md

@@ -466,6 +466,10 @@ added:
   - v13.3.0
   - v12.16.0
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/47286
+    description: This option is no longer required as WASI is
+                 enabled by default, but can still be passed.
   - version: v13.6.0
     pr-url: https://github.com/nodejs/node/pull/30980
     description: changed from `--experimental-wasi-unstable-preview0` to

doc/api/wasi.md

@@ -103,9 +103,6 @@ Use [wabt](https://github.com/WebAssembly/wabt) to compile `.wat` to `.wasm`
 $ wat2wasm demo.wat
 ```
 
-The `--experimental-wasi-unstable-preview1` CLI argument is needed for this
-example to run.
-
 ## Class: `WASI`
 
 <!-- YAML

doc/node.1

@@ -179,7 +179,8 @@ Select extension resolution algorithm for ES Modules; either 'explicit' (default
 Enable experimental ES module support in VM module.
 .
 .It Fl -experimental-wasi-unstable-preview1
-Enable experimental WebAssembly System Interface support.
+Enable experimental WebAssembly System Interface support. This
+flag is no longer required as WASI is enabled by default.
 .
 .It Fl -experimental-wasm-modules
 Enable experimental WebAssembly module support.

lib/internal/process/pre_execution.js

@@ -70,7 +70,6 @@ function prepareExecution(options) {
   initializeReport();
   initializeSourceMapsHandlers();
   initializeDeprecations();
-  initializeWASI();
   require('internal/dns/utils').initializeDns();
 
   if (isMainThread) {
@@ -532,13 +531,6 @@ function readPolicyFromDisk() {
   }
 }
 
-function initializeWASI() {
-  const { BuiltinModule } = require('internal/bootstrap/loaders');
-  const mod = BuiltinModule.map.get('wasi');
-  mod.canBeRequiredByUsers =
-    getOptionValue('--experimental-wasi-unstable-preview1');
-}
-
 function initializeCJSLoader() {
   const CJSLoader = require('internal/modules/cjs/loader');
   if (!getEmbedderOptions().noGlobalSearchPaths) {

src/node_options.cc

@@ -428,10 +428,8 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
             kAllowedInEnvvar);
   AddOption("--experimental-worker", "", NoOp{}, kAllowedInEnvvar);
   AddOption("--experimental-report", "", NoOp{}, kAllowedInEnvvar);
-  AddOption("--experimental-wasi-unstable-preview1",
-            "experimental WASI support",
-            &EnvironmentOptions::experimental_wasi,
-            kAllowedInEnvvar);
+  AddOption(
+      "--experimental-wasi-unstable-preview1", "", NoOp{}, kAllowedInEnvvar);
   AddOption("--expose-internals", "", &EnvironmentOptions::expose_internals);
   AddOption("--frozen-intrinsics",
             "experimental frozen intrinsics support",

src/node_options.h

@@ -185,7 +185,6 @@ class EnvironmentOptions : public Options {
 
   bool syntax_check_only = false;
   bool has_eval_string = false;
-  bool experimental_wasi = false;
   std::string eval_string;
   bool print_eval = false;
   bool force_repl = false;

test/parallel/test-repl-built-in-modules.js

@@ -1,4 +1,3 @@
-// Flags: --experimental-wasi-unstable-preview1
 'use strict';
 const common = require('../common');
 const assert = require('assert');

test/wasi/test-return-on-exit.js

@@ -1,4 +1,3 @@
-// Flags: --experimental-wasi-unstable-preview1
 'use strict';
 
 const common = require('../common');

test/wasi/test-wasi-initialize-validation.js

@@ -28,7 +28,6 @@ if (process.argv[2] === 'wasi-child') {
   const cp = require('child_process');
 
   const child = cp.spawnSync(process.execPath, [
-    '--experimental-wasi-unstable-preview1',
     __filename,
     'wasi-child',
   ], {