module: unflag esm json modules

Author: GeoffreyBooth

doc/node.1

@@ -142,9 +142,6 @@ Enable Source Map V3 support for stack traces.
 .It Fl -experimental-import-meta-resolve
 Enable experimental ES modules support for import.meta.resolve().
 .
-.It Fl -experimental-json-modules
-Enable experimental JSON interop support for the ES Module loader.
-.
 .It Fl -experimental-loader Ns = Ns Ar module
 Specify the
 .Ar module

lib/internal/modules/esm/get_format.js

@@ -8,7 +8,6 @@ const {
 const { extname } = require('path');
 const { getOptionValue } = require('internal/options');
 
-const experimentalJsonModules = getOptionValue('--experimental-json-modules');
 const experimentalSpecifierResolution =
   getOptionValue('--experimental-specifier-resolution');
 const experimentalWasmModules = getOptionValue('--experimental-wasm-modules');
@@ -20,7 +19,8 @@ const extensionFormatMap = {
   '__proto__': null,
   '.cjs': 'commonjs',
   '.js': 'module',
-  '.mjs': 'module'
+  '.json': 'json',
+  '.mjs': 'module',
 };
 
 const legacyExtensionFormatMap = {
@@ -29,17 +29,14 @@ const legacyExtensionFormatMap = {
   '.js': 'commonjs',
   '.json': 'commonjs',
   '.mjs': 'module',
-  '.node': 'commonjs'
+  '.node': 'commonjs',
 };
 
 let experimentalSpecifierResolutionWarned = false;
 
 if (experimentalWasmModules)
   extensionFormatMap['.wasm'] = legacyExtensionFormatMap['.wasm'] = 'wasm';
 
-if (experimentalJsonModules)
-  extensionFormatMap['.json'] = legacyExtensionFormatMap['.json'] = 'json';
-
 const protocolHandlers = ObjectAssign(ObjectCreate(null), {
   'data:'(parsed) {
     const { 1: mime } = RegExpPrototypeExec(
@@ -49,7 +46,7 @@ const protocolHandlers = ObjectAssign(ObjectCreate(null), {
     const format = ({
       '__proto__': null,
       'text/javascript': 'module',
-      'application/json': experimentalJsonModules ? 'json' : null,
+      'application/json': 'json',
       'application/wasm': experimentalWasmModules ? 'wasm' : null
     })[mime] || null;
 

lib/internal/modules/esm/translators.js

@@ -259,7 +259,6 @@ translators.set('builtin', async function builtinStrategy(url) {
 
 // Strategy for loading a JSON file
 translators.set('json', async function jsonStrategy(url, source) {
-  emitExperimentalWarning('Importing JSON modules');
   assertBufferSource(source, true, 'load');
   debug(`Loading JSONModule ${url}`);
   const pathname = StringPrototypeStartsWith(url, 'file:') ?

src/node_options.cc

@@ -315,19 +315,13 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
             kAllowedInEnvironment);
   AddOption("--experimental-abortcontroller", "",
             NoOp{}, kAllowedInEnvironment);
-  AddOption("--experimental-json-modules",
-            "experimental JSON interop support for the ES Module loader",
-            &EnvironmentOptions::experimental_json_modules,
-            kAllowedInEnvironment);
+  AddOption("--experimental-json-modules", "", NoOp{}, kAllowedInEnvironment);
   AddOption("--experimental-loader",
             "use the specified module as a custom loader",
             &EnvironmentOptions::userland_loader,
             kAllowedInEnvironment);
   AddAlias("--loader", "--experimental-loader");
-  AddOption("--experimental-modules",
-            "",
-            &EnvironmentOptions::experimental_modules,
-            kAllowedInEnvironment);
+  AddOption("--experimental-modules","", NoOp{}, kAllowedInEnvironment);
   AddOption("--experimental-wasm-modules",
             "experimental ES Module support for webassembly modules",
             &EnvironmentOptions::experimental_wasm_modules,

src/node_options.h

@@ -107,8 +107,6 @@ class EnvironmentOptions : public Options {
   std::vector<std::string> conditions;
   std::string dns_result_order;
   bool enable_source_maps = false;
-  bool experimental_json_modules = false;
-  bool experimental_modules = false;
   std::string experimental_specifier_resolution;
   bool experimental_wasm_modules = false;
   bool experimental_import_meta_resolve = false;

test/es-module/test-esm-assertionless-json-import.js

@@ -1,4 +1,4 @@
-// Flags: --experimental-json-modules --experimental-loader ./test/fixtures/es-module-loaders/assertionless-json-import.mjs
+// Flags: --experimental-loader ./test/fixtures/es-module-loaders/assertionless-json-import.mjs
 'use strict';
 const common = require('../common');
 const { strictEqual } = require('assert');

test/es-module/test-esm-data-urls.js

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

test/es-module/test-esm-dynamic-import-assertion.js

@@ -1,4 +1,3 @@
-// Flags: --experimental-json-modules
 'use strict';
 const common = require('../common');
 const { strictEqual } = require('assert');

test/es-module/test-esm-dynamic-import-assertion.mjs

@@ -1,4 +1,3 @@
-// Flags: --experimental-json-modules
 import '../common/index.mjs';
 import { strictEqual } from 'assert';
 

test/es-module/test-esm-import-assertion-1.mjs

@@ -1,4 +1,3 @@
-// Flags: --experimental-json-modules
 import '../common/index.mjs';
 import { strictEqual } from 'assert';
 

test/es-module/test-esm-import-assertion-2.mjs

@@ -1,4 +1,3 @@
-// Flags: --experimental-json-modules
 import '../common/index.mjs';
 import { strictEqual } from 'assert';
 

test/es-module/test-esm-import-assertion-3.mjs

@@ -1,4 +1,3 @@
-// Flags: --experimental-json-modules
 import '../common/index.mjs';
 import { strictEqual } from 'assert';
 

test/es-module/test-esm-import-assertion-4.mjs

@@ -1,4 +1,3 @@
-// Flags: --experimental-json-modules
 import '../common/index.mjs';
 import { strictEqual } from 'assert';
 

test/es-module/test-esm-import-assertion-errors.js

@@ -1,4 +1,3 @@
-// Flags: --experimental-json-modules
 'use strict';
 const common = require('../common');
 const { rejects } = require('assert');

test/es-module/test-esm-import-assertion-errors.mjs

@@ -1,4 +1,3 @@
-// Flags: --experimental-json-modules
 import '../common/index.mjs';
 import { rejects } from 'assert';
 

test/es-module/test-esm-import-json-named-export.mjs

@@ -5,7 +5,6 @@ import { spawn } from 'child_process';
 import { execPath } from 'process';
 
 const child = spawn(execPath, [
-  '--experimental-json-modules',
   path('es-modules', 'import-json-named-export.mjs'),
 ]);
 

test/es-module/test-esm-invalid-data-urls.js

@@ -5,20 +5,14 @@ const assert = require('assert');
 (async () => {
   await assert.rejects(import('data:text/plain,export default0'), {
     code: 'ERR_INVALID_MODULE_SPECIFIER',
-    message:
-      'Invalid module "data:text/plain,export default0" has an unsupported ' +
-      'MIME type "text/plain"',
+    message: 'Invalid module "data:text/plain,export default0" has an unsupported MIME type "text/plain"',
   });
   await assert.rejects(import('data:text/plain;base64,'), {
     code: 'ERR_INVALID_MODULE_SPECIFIER',
-    message:
-      'Invalid module "data:text/plain;base64," has an unsupported ' +
-      'MIME type "text/plain"',
+    message: 'Invalid module "data:text/plain;base64," has an unsupported MIME type "text/plain"',
   });
-  await assert.rejects(import('data:application/json,[]'), {
+  await assert.rejects(import('data:text/css,.error { color: red; }'), {
     code: 'ERR_INVALID_MODULE_SPECIFIER',
-    message:
-      'Invalid module "data:application/json,[]" has an unsupported ' +
-      'MIME type "application/json"',
+    message: 'Invalid module "data:text/css,.error { color: red; }" has an unsupported MIME type "text/css"',
   });
 })().then(common.mustCall());

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

@@ -1,4 +1,3 @@
-// Flags: --experimental-json-modules
 import '../common/index.mjs';
 
 import { strictEqual, deepStrictEqual } from 'assert';

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

@@ -1,29 +1,6 @@
-// Flags: --experimental-json-modules
 import '../common/index.mjs';
-import { path } from '../common/fixtures.mjs';
-import { strictEqual, ok } from 'assert';
-import { spawn } from 'child_process';
+import { strictEqual } from 'assert';
 
 import secret from '../fixtures/experimental.json' assert { type: 'json' };
 
 strictEqual(secret.ofLife, 42);
-
-// Test warning message
-const child = spawn(process.execPath, [
-  '--experimental-json-modules',
-  path('/es-modules/json-modules.mjs'),
-]);
-
-let stderr = '';
-child.stderr.setEncoding('utf8');
-child.stderr.on('data', (data) => {
-  stderr += data;
-});
-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'
-  ));
-});

test/es-module/test-esm-non-js.js

@@ -0,0 +1,23 @@
+import { mustCall } from '../common/index.mjs';
+import { fileURL } from '../common/fixtures.mjs';
+import { match, strictEqual } from 'assert';
+import { spawn } from 'child_process';
+import { execPath } from 'process';
+
+// Verify non-js extensions fail for ESM
+const child = spawn(execPath, [
+  '--input-type=module',
+  '--eval',
+  `import ${JSON.stringify(fileURL('es-modules', 'file.unknown'))}`,
+]);
+
+let stderr = '';
+child.stderr.setEncoding('utf8');
+child.stderr.on('data', (data) => {
+  stderr += data;
+});
+child.on('close', mustCall((code, signal) => {
+  strictEqual(code, 1);
+  strictEqual(signal, null);
+  match(stderr, /ERR_UNKNOWN_FILE_EXTENSION/);
+}));