ESM support (#1235)

test/unit/esm/index.test.js

@@ -0,0 +1,19 @@
+'use strict'
+
+const t = require('tap')
+const semver = require('semver')
+
+if (semver.lt(process.versions.node, '12.17.0')) {
+  t.skip('Skip because Node version < 12.17.0')
+  t.end()
+} else {
+  // Node v8 throw a `SyntaxError: Unexpected token import`
+  // even if this branch is never touch in the code,
+  // by using `eval` we can avoid this issue.
+  // eslint-disable-next-line
+  new Function('module', 'return import(module)')('./index.mjs').catch((err) => {
+    process.nextTick(() => {
+      throw err
+    })
+  })
+}