feat(unstable): `--unstable-detect-cjs` for respecting explicit `"type": "commonjs"` (#26149)

When using the `--unstable-detect-cjs` flag or adding `"unstable":
["detect-cjs"]` to a deno.json, it will make a JS file CJS if the
closest package.json contains `"type": "commonjs"` and the file is not
an ESM module (no TLA, no `import.meta`, no `import`/`export`).

1 files changed, 24 insertions, 0 deletions

diff --git a/tests/specs/compile/detect_cjs/__test__.jsonc b/tests/specs/compile/detect_cjs/__test__.jsonc
new file mode 100644
index 000000000..32bebb7a5
--- /dev/null
+++ b/tests/specs/compile/detect_cjs/__test__.jsonc
@@ -0,0 +1,24 @@
+{
+  "tempDir": true,
+  "steps": [{
+    "if": "unix",
+    "args": "compile --allow-read --output main main.js",
+    "output": "compile.out"
+  }, {
+    "if": "unix",
+    "commandName": "./main",
+    "args": [],
+    "output": "output.out",
+    "exitCode": 1
+  }, {
+    "if": "windows",
+    "args": "compile --allow-read --output main.exe main.js",
+    "output": "compile.out"
+  }, {
+    "if": "windows",
+    "commandName": "./main.exe",
+    "args": [],
+    "output": "output.out",
+    "exitCode": 1
+  }]
+}