chore: add allow

src/index.js

@@ -19,13 +19,14 @@ const [nodeMajor] = process.version.slice(1).split('.').map(Number)
 
 const PERMISSION_FLAG = nodeMajor >= 24 ? '--permission' : '--experimental-permission'
 
-const flags = ({ memory }) => {
+const flags = ({ memory, allow }) => {
   const flags = ['--disable-warning=ExperimentalWarning', PERMISSION_FLAG]
   if (memory) flags.push(`--max-old-space-size=${memory}`)
+  allow.forEach(resource => flags.push(`--allow-${resource}`))
   return flags.join(' ')
 }
 
-module.exports = (snippet, { tmpdir, timeout, memory, throwError = true } = {}) => {
+module.exports = (snippet, { tmpdir, timeout, memory, throwError = true, allow = [] } = {}) => {
   if (!['function', 'string'].includes(typeof snippet)) throw new TypeError('Expected a function')
   const compilePromise = compile(snippet, tmpdir)
 
@@ -38,7 +39,7 @@ module.exports = (snippet, { tmpdir, timeout, memory, throwError = true } = {})
       const subprocess = $('node', ['-', JSON.stringify(args)], {
         env: {
           ...process.env,
-          NODE_OPTIONS: flags({ memory })
+          NODE_OPTIONS: flags({ memory, allow })
         },
         timeout,
         killSignal: 'SIGKILL'

test/allow.js

@@ -0,0 +1,62 @@
+'use strict'
+
+const test = require('ava')
+
+const isolatedFunction = require('..')
+
+const [nodeMajor] = process.version.slice(1).split('.').map(Number)
+
+test('child-process', async t => {
+  const [fn, cleanup] = isolatedFunction(
+    () => {
+      const { execSync } = require('child_process')
+      return execSync('echo hello').toString()
+    },
+    {
+      allow: ['child_process']
+    }
+  )
+
+  t.teardown(cleanup)
+
+  const { value } = await fn()
+  t.is(value, 'hello\n')
+})
+;(nodeMajor >= 25 ? test : test.skip)('network', async t => {
+  const [fn, cleanup] = isolatedFunction(
+    async () => {
+      function doFetch (url) {
+        return new Promise((resolve, reject) => {
+          const req = require('node:http').get(url, res => {
+            let data = ''
+
+            res.on('data', chunk => {
+              data += chunk
+            })
+
+            res.on('end', () => {
+              resolve({
+                statusCode: res.statusCode,
+                headers: res.headers,
+                body: data
+              })
+            })
+          })
+
+          req.on('error', reject)
+        })
+      }
+
+      const { statusCode } = await doFetch('http://example.com')
+      return statusCode
+    },
+    {
+      allow: ['net']
+    }
+  )
+
+  t.teardown(cleanup)
+
+  const { value } = await fn()
+  t.is(value, 200)
+})