fix(run): interpret extensionless files as typescript (#5711)

* test

* gadsgsagdsa

* add better err msg

* r

* oops

* ok

6 files changed, 44 insertions, 2 deletions

diff --git a/test/bun.lockb b/test/bun.lockb
index f4097bda9..8abf35b6f 100755
--- a/test/bun.lockb
+++ b/test/bun.lockb
diff --git a/test/cli/run/run-cjs.test.ts b/test/cli/run/run-cjs.test.ts
index 34c77d106..4c0d37002 100644
--- a/test/cli/run/run-cjs.test.ts
+++ b/test/cli/run/run-cjs.test.ts
@@ -4,7 +4,7 @@ import { bunEnv, bunExe } from "harness";
 import { tmpdir } from "os";
 import { join } from "path";
 
-test.todo("running a commonjs module works", async () => {
+test("running a commonjs module works", async () => {
   const dir = join(realpathSync(tmpdir()), "bun-run-test1");
   mkdirSync(dir, { recursive: true });
   await Bun.write(join(dir, "index1.js"), "module.exports = 1; console.log('hello world');");
diff --git a/test/cli/run/run-extensionless.test.ts b/test/cli/run/run-extensionless.test.ts
new file mode 100644
index 000000000..642c274d9
--- /dev/null
+++ b/test/cli/run/run-extensionless.test.ts
@@ -0,0 +1,31 @@
+import { expect, test } from "bun:test";
+import { mkdirSync, realpathSync } from "fs";
+import { bunEnv, bunExe } from "harness";
+import { writeFileSync } from "fs";
+import { tmpdir } from "os";
+import { join } from "path";
+
+test("running extensionless file works", async () => {
+  const dir = join(realpathSync(tmpdir()), "bun-run-test1");
+  mkdirSync(dir, { recursive: true });
+  await Bun.write(join(dir, "cool"), "const x: Test = 2; console.log('hello world');");
+  let { stdout } = Bun.spawnSync({
+    cmd: [bunExe(), join(dir, "./cool")],
+    cwd: dir,
+    env: bunEnv,
+  });
+  expect(stdout.toString("utf8")).toEqual("hello world\n");
+});
+
+test("running shebang typescript file works", async () => {
+  const dir = join(realpathSync(tmpdir()), "bun-run-test2");
+  mkdirSync(dir, { recursive: true });
+  writeFileSync(join(dir, "cool"), `#!${bunExe()}\nconst x: Test = 2; console.log('hello world');`, { mode: 0o777 });
+
+  let { stdout } = Bun.spawnSync({
+    cmd: [join(dir, "./cool")],
+    cwd: dir,
+    env: bunEnv,
+  });
+  expect(stdout.toString("utf8")).toEqual("hello world\n");
+});
diff --git a/test/js/third_party/yargs/package.json b/test/js/third_party/yargs/package.json
new file mode 100644
index 000000000..dd7ab02b0
--- /dev/null
+++ b/test/js/third_party/yargs/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "yargs-test",
+  "version": "1.0.0",
+  "dependencies": {
+    "yargs": "17.7.2"
+  }
+}
diff --git a/test/js/third_party/yargs/yargs-cjs.test.js b/test/js/third_party/yargs/yargs-cjs.test.js
new file mode 100644
index 000000000..06e4d9cb8
--- /dev/null
+++ b/test/js/third_party/yargs/yargs-cjs.test.js
@@ -0,0 +1,4 @@
+test("yargs/yargs works", () => {
+  const yargs = require("yargs/yargs");
+  expect(yargs).toBeFunction();
+});
diff --git a/test/package.json b/test/package.json
index 9e55cc543..07bb9fc37 100644
--- a/test/package.json
+++ b/test/package.json
@@ -38,7 +38,7 @@
     "vitest": "0.32.2",
     "webpack": "5.88.0",
     "webpack-cli": "4.7.2",
-    "mongodb": "6.0.0"
+    "yargs": "17.7.2"
   },
   "private": true,
   "scripts": {