Support JS ESM (#9)

* Support JS ESM

Signed-off-by: Matteo Collina <hello@matteocollina.com>

* fixup

Signed-off-by: Matteo Collina <hello@matteocollina.com>

* fixup

Signed-off-by: Matteo Collina <hello@matteocollina.com>

---------

Signed-off-by: Matteo Collina <hello@matteocollina.com>

fixtures/js-esm/lib/add.js

@@ -0,0 +1,3 @@
+export function add (x, y) {
+  return x + y
+}

fixtures/js-esm/test/add.test.js

@@ -0,0 +1,7 @@
+import { test } from 'node:test'
+import { add } from '../lib/add.js'
+import { strictEqual } from 'node:assert'
+
+test('add', () => {
+  strictEqual(add(1, 2), 3)
+})

fixtures/js-esm/test/add2.test.js

@@ -0,0 +1,7 @@
+import { test } from 'node:test'
+import { add } from '../lib/add.js'
+import { strictEqual } from 'node:assert'
+
+test('add2', () => {
+  strictEqual(add(3, 2), 5)
+})

lib/run.js

@@ -58,10 +58,17 @@ export default async function runWithTypeScript (config) {
   }
   config.prefix = prefix
   config.setup = (test) => {
-    for (const chunk of pushable) {
-      test.reporter.push(chunk)
+    if (test.reporter) {
+      for (const chunk of pushable) {
+        test.reporter.push(chunk)
+      }
+      pushable = test.reporter
+    } else {
+      for (const chunk of pushable) {
+        test.push(chunk)
+      }
+      pushable = test
     }
-    pushable = test.reporter
   }
 
   let tscChild
@@ -124,7 +131,7 @@ export default async function runWithTypeScript (config) {
   } else if (prefix) {
     files = await glob(join(prefix, join('**', '*.test.{cjs,mjs,js}')), { ignore, cwd, windowsPathsNoEscape: true })
   } else {
-    files = await glob(join('**', '*.test.{cjs,mjs,js}'), { ignore, cwd, windowsPathsNoEscape: true })
+    files = await glob(join('**', '*.test.{cjs,mjs,js}'), { ignore, cwd, windowsPathsNoEscape: true, absolute: true })
   }
 
   config.files = files

test/basic.test.js

@@ -165,3 +165,24 @@ test('only-src', async (t) => {
 
   await completed
 })
+
+test('js-esm', async (t) => {
+  const { strictEqual, completed } = tspl(t, { plan: 2 })
+  const config = {
+    files: [],
+    cwd: join(import.meta.url, '..', 'fixtures', 'js-esm')
+  }
+
+  const stream = await runWithTypeScript(config)
+
+  const names = new Set(['add', 'add2'])
+
+  stream.on('test:pass', (test) => {
+    strictEqual(names.has(test.name), true)
+    names.delete(test.name)
+  })
+
+  stream.resume()
+
+  await completed
+})