Remove experimentalModules option

lib/generate/config.js

@@ -14,7 +14,6 @@ export function config(ctx) {
     main = resolveFrom(mainRoot, mainId)
   } catch {}
 
-  ctx.experimentalModules = options.experimentalModules || false
   ctx.cwd = cwd
   ctx.main = main
   ctx.name = options.name || pkg.name || null

lib/generate/instrument.js

@@ -29,8 +29,6 @@ export async function instrument(ctx) {
 
     return {
       visitor: {
-        // Not tested on dubnium. Remove when tests are Node 12+
-        /* c8 ignore next 3 */
         ImportDeclaration(path) {
           instrumentMainReference(path.node.source)
         },

lib/generate/run.js

@@ -5,20 +5,13 @@ const exec = promisify(cp.exec)
 
 export async function run(ctx) {
   const logs = ctx.logs
-  const cmd = [process.execPath]
-
-  // Not tested on dubnium. Remove when tests are Node 12+
-  /* c8 ignore next 3 */
-  if (ctx.experimentalModules) {
-    cmd.push('--experimental-modules')
-  }
-
-  cmd.push(ctx.exampleInstrumentedPath)
 
   let result
 
   try {
-    result = await exec(cmd.join(' '))
+    result = await exec(
+      [process.execPath, ctx.exampleInstrumentedPath].join(' ')
+    )
   } catch (error) {
     throw new Error('Could not run example: ' + error)
   }

readme.md

@@ -157,13 +157,6 @@ If given, resolved from [`file.cwd`][file-cwd].
 If inferred from `package.json`, resolved relating to that package root.
 Used to rewrite `require('.')` to `require('name')`.
 
-###### `options.experimentalModules`
-
-Pass [`--experimental-modules`][experimental-modules] when running the example
-in Node.
-This lets you use ECMAScript Modules if the current version of Node does support
-this flag, but *does not* support ES modules natively.
-
 ## Security
 
 Use of `remark-usage` is unsafe because `main` and `example` are executed.
@@ -230,8 +223,6 @@ abide by its terms.
 
 [file-cwd]: https://github.com/vfile/vfile#vfilecwd
 
-[experimental-modules]: https://nodejs.org/api/esm.html
-
 [usage]: #use
 
 [example-js]: example.js

test/index.js

@@ -6,7 +6,7 @@ import {isHidden} from 'is-hidden'
 import remarkUsage from '../index.js'
 
 const root = path.join('test', 'fixtures')
-let fixtures = fs.readdirSync(root)
+const fixtures = fs.readdirSync(root)
 
 fs.writeFileSync(
   path.join(root, 'fail-could-not-parse-example', 'example.js'),
@@ -33,16 +33,6 @@ test('remarkUsage', (t) => {
   t.end()
 })
 
-// Ignore es modules below Node 12.
-const version = Number.parseInt(process.version.slice(1), 10)
-
-if (version < 12) {
-  fixtures = fixtures.filter((f) => {
-    const prefix = 'es-module'
-    return f.slice(0, prefix.length) !== prefix
-  })
-}
-
 test('Fixtures', async (t) => {
   let index = -1