lib: add option to silence warnings

doc/api/cli.md

@@ -848,6 +848,13 @@ Enables report to be generated on uncaught exceptions. Useful when inspecting
 the JavaScript stack in conjunction with native stack and other runtime
 environment data.
 
+### `--suppress-warnings`
+<!-- YAML
+added: REPLACEME
+-->
+
+Silence deprecation and experimental warnings for specified codes.
+
 ### `--throw-deprecation`
 <!-- YAML
 added: v0.11.14
@@ -1358,6 +1365,7 @@ Node.js options that are allowed are:
 * `--report-signal`
 * `--report-uncaught-exception`
 * `--require`, `-r`
+* `--suppress-warnings`
 * `--throw-deprecation`
 * `--title`
 * `--tls-cipher-list`

doc/node.1

@@ -359,6 +359,9 @@ Enables
 to be generated on un-caught exceptions. Useful when inspecting JavaScript
 stack in conjunction with native stack and other runtime environment data.
 .
+.It Fl -suppress-warnings
+Silence warnings for specified codes.
+.
 .It Fl -throw-deprecation
 Throw errors for deprecations.
 .

lib/internal/modules/esm/translators.js

@@ -290,7 +290,7 @@ translators.set('builtin', async function builtinStrategy(url) {
 
 // Strategy for loading a JSON file
 translators.set('json', async function jsonStrategy(url) {
-  emitExperimentalWarning('Importing JSON modules');
+  emitExperimentalWarning('Importing JSON modules', 'EXP0003');
   debug(`Translating JSONModule ${url}`);
   debug(`Loading JSONModule ${url}`);
   const pathname = StringPrototypeStartsWith(url, 'file:') ?
@@ -351,7 +351,7 @@ translators.set('json', async function jsonStrategy(url) {
 
 // Strategy for loading a wasm module
 translators.set('wasm', async function(url) {
-  emitExperimentalWarning('Importing Web Assembly modules');
+  emitExperimentalWarning('Importing Web Assembly modules', 'EXP0007');
   let { source } = await this._getSource(
     url, { format: 'wasm' }, defaultGetSource);
   assertBufferSource(source, false, 'getSource');

lib/internal/process/esm_loader.js

@@ -51,7 +51,7 @@ async function initializeLoader() {
   // If --experimental-loader is specified, create a loader with user hooks.
   // Otherwise create the default loader.
   const { emitExperimentalWarning } = require('internal/util');
-  emitExperimentalWarning('--experimental-loader');
+  emitExperimentalWarning('--experimental-loader', 'EXP0002');
   return (async () => {
     const hooks =
         await ESMLoader.import(userLoader, pathToFileURL(cwd).href);

lib/internal/process/warning.js

@@ -137,6 +137,14 @@ function emitWarning(warning, type, code, ctor) {
   if (warning.name === 'DeprecationWarning') {
     if (process.noDeprecation)
       return;
+    const options = require('internal/options');
+    const opts = options.getOptionValue('--suppress-warnings');
+    var list = opts.split(',');
+    let found = false;
+    list.forEach((e) => {
+      if (e === code) found = true;
+    });
+    if (found) return;
     if (process.throwDeprecation) {
       // Delay throwing the error to guarantee that all former warnings were
       // properly logged.

lib/internal/util.js

@@ -175,11 +175,20 @@ function slowCases(enc) {
   }
 }
 
-function emitExperimentalWarning(feature) {
+function emitExperimentalWarning(feature, code) {
   if (experimentalWarnings.has(feature)) return;
-  const msg = `${feature} is an experimental feature. This feature could ` +
-       'change at any time';
   experimentalWarnings.add(feature);
+  const { getOptionValue } = require('internal/options');
+  const opts = getOptionValue('--suppress-warnings');
+  const list = opts.split(',');
+  let found = false;
+  list.forEach((e) => {
+    if (e === code) found = true;
+  });
+  if (found) return;
+
+  const msg = `[${code}] ${feature} is an experimental feature. ` +
+               'This feature could change at any time';
   process.emitWarning(msg, 'ExperimentalWarning');
 }
 

lib/internal/vm/module.js

@@ -74,7 +74,7 @@ const kLink = Symbol('kLink');
 
 class Module {
   constructor(options) {
-    emitExperimentalWarning('VM Modules');
+    emitExperimentalWarning('VM Modules', 'EXP0005');
 
     if (new.target === Module) {
       // eslint-disable-next-line no-restricted-syntax

lib/vm.js

@@ -387,7 +387,7 @@ const measureMemoryExecutions = {
 };
 
 function measureMemory(options = {}) {
-  emitExperimentalWarning('vm.measureMemory');
+  emitExperimentalWarning('vm.measureMemory', 'EXP0004');
   validateObject(options, 'options');
   const { mode = 'summary', execution = 'default' } = options;
   validateOneOf(mode, 'options.mode', ['summary', 'detailed']);

lib/wasi.js

@@ -26,7 +26,7 @@ const kSetMemory = Symbol('kSetMemory');
 const kStarted = Symbol('kStarted');
 const kInstance = Symbol('kInstance');
 
-emitExperimentalWarning('WASI');
+emitExperimentalWarning('WASI', 'EXP0006');
 
 
 function setupInstance(self, instance) {

src/node_options.cc

@@ -401,6 +401,10 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
   AddOption("--prof-process",
             "process V8 profiler output generated using --prof",
             &EnvironmentOptions::prof_process);
+  AddOption("--suppress-warnings",
+            "silence warnings for specified codes",
+            &EnvironmentOptions::suppress_warnings,
+            kAllowedInEnvironment);
   // Options after --prof-process are passed through to the prof processor.
   AddAlias("--prof-process", { "--prof-process", "--" });
 #if HAVE_INSPECTOR

src/node_options.h

@@ -126,6 +126,7 @@ class EnvironmentOptions : public Options {
   bool preserve_symlinks = false;
   bool preserve_symlinks_main = false;
   bool prof_process = false;
+  std::string suppress_warnings;
 #if HAVE_INSPECTOR
   std::string cpu_prof_dir;
   static const uint64_t kDefaultCpuProfInterval = 1000;

test/common/measure-memory.js

@@ -45,8 +45,8 @@ function assertSingleDetailedShape(result) {
 
 function expectExperimentalWarning() {
   common.expectWarning('ExperimentalWarning',
-                       'vm.measureMemory is an experimental feature. ' +
-                       'This feature could change at any time');
+                       '[EXP0004] vm.measureMemory is an experimental ' +
+                       'feature. This feature could change at any time');
 }
 
 module.exports = {

test/es-module/test-esm-json.mjs

@@ -23,7 +23,7 @@ child.on('close', (code, signal) => {
   strictEqual(code, 0);
   strictEqual(signal, null);
   ok(stderr.toString().includes(
-    'ExperimentalWarning: Importing JSON modules is an experimental feature. ' +
-    'This feature could change at any time'
+    'ExperimentalWarning: [EXP0003] Importing JSON modules is an ' +
+    'experimental feature. This feature could change at any time'
   ));
 });

test/es-module/test-esm-wasm.mjs

@@ -31,7 +31,7 @@ child.on('close', (code, signal) => {
   strictEqual(code, 0);
   strictEqual(signal, null);
   ok(stderr.toString().includes(
-    'ExperimentalWarning: Importing Web Assembly modules is ' +
-    'an experimental feature. This feature could change at any time'
+    'ExperimentalWarning: [EXP0007] Importing Web Assembly modules ' +
+    'is an experimental feature. This feature could change at any time'
   ));
 });

test/message/esm_loader_not_found.out

@@ -1,4 +1,4 @@
-(node:*) ExperimentalWarning: --experimental-loader is an experimental feature. This feature could change at any time
+(node:*) ExperimentalWarning: [EXP0002] --experimental-loader is an experimental feature. This feature could change at any time
 (Use `* --trace-warnings ...` to show where the warning was created)
 node:internal/process/esm_loader:*
     internalBinding('errors').triggerUncaughtException(

test/message/esm_loader_not_found_cjs_hint_relative.out

@@ -1,4 +1,4 @@
-(node:*) ExperimentalWarning: --experimental-loader is an experimental feature. This feature could change at any time
+(node:*) ExperimentalWarning: [EXP0002] --experimental-loader is an experimental feature. This feature could change at any time
 (Use `* --trace-warnings ...` to show where the warning was created)
 node:internal/process/esm_loader:*
     internalBinding('errors').triggerUncaughtException(

test/message/esm_loader_syntax_error.out

@@ -1,4 +1,4 @@
-(node:*) ExperimentalWarning: --experimental-loader is an experimental feature. This feature could change at any time
+(node:*) ExperimentalWarning: [EXP0002] --experimental-loader is an experimental feature. This feature could change at any time
 (Use `* --trace-warnings ...` to show where the warning was created)
 file://*/test/fixtures/es-module-loaders/syntax-error.mjs:2
 await async () => 0;

test/parallel/test-suppress-warnings.js

@@ -0,0 +1,47 @@
+'use strict';
+require('../common');
+const tmpdir = require('../common/tmpdir');
+const assert = require('assert');
+const cp = require('child_process');
+const fs = require('fs');
+const path = require('path');
+if (process.argv[2] === 'single-dep-skip') {
+  new Buffer(10);
+} else if (process.argv[2] === 'multi-dep-skip') {
+  new Buffer(10);
+  tmpdir.refresh();
+  const filePath = path.join(tmpdir.path, 'rmdir-recursive.txt');
+  fs.rmdir(filePath, { recursive: true }, () => {});
+} else if (process.argv[2] === 'single-exp-skip') {
+  const vm = require('vm');
+  vm.measureMemory();
+} else if (process.argv[2] === 'multi-exp-skip') {
+  const vm = require('vm');
+  vm.measureMemory();
+  new AbortController();
+} else {
+  const child_single_dep_skip = cp.spawnSync(process.execPath,
+                                             ['--suppress-warnings=DEP0005',
+                                              __filename, 'single-dep-skip']);
+  assert.strictEqual(child_single_dep_skip.stdout.toString(), '');
+  assert.strictEqual(child_single_dep_skip.stderr.toString(), '');
+  const child_multi_dep_skip = cp.spawnSync(process.execPath,
+                                            ['--suppress-warnings=' +
+                                             'DEP0005,DEP0147',
+                                             __filename,
+                                             'multi-dep-skip']);
+  assert.strictEqual(child_multi_dep_skip.stdout.toString(), '');
+  assert.strictEqual(child_multi_dep_skip.stderr.toString(), '');
+  const child_single_exp_skip = cp.spawnSync(process.execPath,
+                                             ['--suppress-warnings=EXP0004',
+                                              __filename, 'single-exp-skip']);
+  assert.strictEqual(child_single_exp_skip.stdout.toString(), '');
+  assert.strictEqual(child_single_exp_skip.stderr.toString(), '');
+  const child_multi_exp_skip = cp.spawnSync(process.execPath,
+                                            ['--suppress-warnings=' +
+                                             'EXP0004,EXP0001',
+                                             __filename,
+                                             'multi-exp-skip']);
+  assert.strictEqual(child_multi_exp_skip.stdout.toString(), '');
+  assert.strictEqual(child_multi_exp_skip.stderr.toString(), '');
+}

test/wasi/test-wasi-symlinks.js

@@ -5,8 +5,8 @@ const path = require('path');
 
 if (process.argv[2] === 'wasi-child') {
   common.expectWarning('ExperimentalWarning',
-                       'WASI is an experimental feature. This feature could ' +
-                       'change at any time');
+                       '[EXP0006] WASI is an experimental feature. This ' +
+                       'feature could change at any time');
 
   const { WASI } = require('wasi');
   const wasmDir = path.join(__dirname, 'wasm');

test/wasi/test-wasi.js

@@ -1,4 +1,5 @@
 'use strict';
+
 const common = require('../common');
 
 if (process.argv[2] === 'wasi-child') {
@@ -8,8 +9,8 @@ if (process.argv[2] === 'wasi-child') {
   const path = require('path');
 
   common.expectWarning('ExperimentalWarning',
-                       'WASI is an experimental feature. This feature could ' +
-                       'change at any time');
+                       '[EXP0006] WASI is an experimental feature. This ' +
+                       'feature could change at any time');
 
   const { WASI } = require('wasi');
   tmpdir.refresh();