feat: Allow importing .cjs files (#25426)

This commit adds support for executing top-level `.cjs` files, 
as well as import `.cjs` files from within npm packages.

This works only for `.cjs` files, the contents of sibling `package.json`
are not consulted for the `"type"` field.

Closes https://github.com/denoland/deno/issues/25384

---------

Signed-off-by: David Sherret <dsherret@users.noreply.github.com>
Co-authored-by: Luca Casonato <hello@lcas.dev>
Co-authored-by: David Sherret <dsherret@users.noreply.github.com>

9 files changed, 53 insertions, 0 deletions

diff --git a/tests/specs/run/import_common_js/__test__.jsonc b/tests/specs/run/import_common_js/__test__.jsonc
new file mode 100644
index 000000000..a09929cdd
--- /dev/null
+++ b/tests/specs/run/import_common_js/__test__.jsonc
@@ -0,0 +1,6 @@
+{
+  "steps": [
+    { "args": "run -R index.cjs", "output": "index.out" },
+    { "args": "run -R main.ts", "output": "main.out" }
+  ]
+}
diff --git a/tests/specs/run/import_common_js/a.js b/tests/specs/run/import_common_js/a.js
new file mode 100644
index 000000000..c465ab588
--- /dev/null
+++ b/tests/specs/run/import_common_js/a.js
@@ -0,0 +1,7 @@
+function foobar() {
+  console.log("foobar");
+}
+
+module.exports = {
+  foobar,
+};
diff --git a/tests/specs/run/import_common_js/index.cjs b/tests/specs/run/import_common_js/index.cjs
new file mode 100644
index 000000000..18caf81e9
--- /dev/null
+++ b/tests/specs/run/import_common_js/index.cjs
@@ -0,0 +1,9 @@
+const process = require("process");
+const a = require("./a");
+
+console.log(process.cwd());
+
+module.exports = {
+  cwd: process.cwd,
+  foobar: a.foobar,
+};
diff --git a/tests/specs/run/import_common_js/index.out b/tests/specs/run/import_common_js/index.out
new file mode 100644
index 000000000..3650631b7
--- /dev/null
+++ b/tests/specs/run/import_common_js/index.out
@@ -0,0 +1 @@
+[WILDCARD]import_common_js
diff --git a/tests/specs/run/import_common_js/main.out b/tests/specs/run/import_common_js/main.out
new file mode 100644
index 000000000..03301b362
--- /dev/null
+++ b/tests/specs/run/import_common_js/main.out
@@ -0,0 +1,5 @@
+hello from foo node module
+[WILDCARD]import_common_js
+cjsModule.cwd() [WILDCARD]import_common_js
+foobar
+cjsModule.foobar() undefined
diff --git a/tests/specs/run/import_common_js/main.ts b/tests/specs/run/import_common_js/main.ts
new file mode 100644
index 000000000..65b75b729
--- /dev/null
+++ b/tests/specs/run/import_common_js/main.ts
@@ -0,0 +1,3 @@
+import foo from "foo";
+
+foo();
diff --git a/tests/specs/run/import_common_js/node_modules/foo/index.mjs b/tests/specs/run/import_common_js/node_modules/foo/index.mjs
new file mode 100644
index 000000000..cc93554c7
--- /dev/null
+++ b/tests/specs/run/import_common_js/node_modules/foo/index.mjs
@@ -0,0 +1,14 @@
+import process from "node:process";
+import path from "node:path";
+import url from "node:url";
+
+export default async function () {
+    console.log("hello from foo node module");
+
+    const cjsFileToImport = path.join(process.cwd(), "index.cjs");
+
+    const cjsModule = await import(url.pathToFileURL(cjsFileToImport));
+
+    console.log("cjsModule.cwd()", cjsModule.cwd());
+    console.log("cjsModule.foobar()", cjsModule.foobar());
+}
diff --git a/tests/specs/run/import_common_js/node_modules/foo/package.json b/tests/specs/run/import_common_js/node_modules/foo/package.json
new file mode 100644
index 000000000..ac525b7b8
--- /dev/null
+++ b/tests/specs/run/import_common_js/node_modules/foo/package.json
@@ -0,0 +1,3 @@
+{
+    "main": "./index.mjs"
+}
\ No newline at end of file
diff --git a/tests/specs/run/import_common_js/package.json b/tests/specs/run/import_common_js/package.json
new file mode 100644
index 000000000..03457387a
--- /dev/null
+++ b/tests/specs/run/import_common_js/package.json
@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "foo": "*"
+  }
+}