skip the test on older node versions without module.register

test/process-module/test.mjs

@@ -1,12 +1,21 @@
-import { register } from 'module'
 import * as assert from 'assert'
+import * as mod from 'module'
 
-register('../../hook.mjs', import.meta.url)
+const [major, minor] = process.versions.node.split('.').map(Number)
 
-const rootExports = await import('../fixtures/re-export-star-external.mjs')
-assert.equal(rootExports.foo, 'bar')
-console.log('export * from \'some-external-module\'\n  ✅ contains exports: foo')
+if (!((major >= 21) || (major >= 18 && minor >= 19) || (major >= 20 && minor >= 6))) {
+  console.log('skipping test due to requiring Node.js >= v18.19.0 or v20.6.0')
+  process.exit(0)
+}
 
-const namedExports = await import('../fixtures/sub-directory/re-export-star-external.mjs')
-assert.equal(namedExports.bar, 'baz')
-console.log('export * from \'some-external-module/sub\'\n  ✅ contains exports: bar')
+mod.register('../../hook.mjs', import.meta.url)
+
+import('../fixtures/re-export-star-external.mjs').then(exports => {
+  assert.equal(exports.foo, 'bar')
+  console.log('export * from \'some-external-module\'\n  ✅ contains exports: foo')
+})
+
+import('../fixtures/sub-directory/re-export-star-external.mjs').then(exports => {
+  assert.equal(exports.bar, 'baz')
+  console.log('export * from \'some-external-module/sub\'\n  ✅ contains exports: bar')
+})