feat(unstable): Node CJS and ESM resolvers for compat mode (#12424)

This commit adds CJS and ESM Node resolvers to the "--compat" mode.

The functionality is spread across "cli/compat" module and Node compatibility
layer in "deno_std/node"; this stems from the fact that ES module resolution
can only be implemented in Rust as it needs to directly integrated with 
"deno_core"; however "deno_std/node" already provided CJS module resolution.

Currently this resolution is only active when running a files using 
"deno run --compat --unstable <filename>", and is not available in other
subcommands, which will be changed in follow up commits.

6 files changed, 5 insertions, 21 deletions

diff --git a/cli/tests/integration/compat_tests.rs b/cli/tests/integration/compat_tests.rs
index 6b6ab81b5..17388a78e 100644
--- a/cli/tests/integration/compat_tests.rs
+++ b/cli/tests/integration/compat_tests.rs
@@ -9,21 +9,15 @@ itest!(globals {
 });
 
 itest!(fs_promises {
-  args: "run --compat --unstable -A compat/fs_promises.js",
+  args: "run --compat --unstable -A compat/fs_promises.mjs",
   output: "compat/fs_promises.out",
 });
 
 itest!(node_prefix_fs_promises {
-  args: "run --compat --unstable -A compat/node_fs_promises.js",
+  args: "run --compat --unstable -A compat/node_fs_promises.mjs",
   output: "compat/fs_promises.out",
 });
 
-itest!(existing_import_map {
-  args: "run --compat --unstable --import-map compat/existing_import_map.json compat/fs_promises.js",
-  output: "compat/existing_import_map.out",
-  exit_code: 1,
-});
-
 #[test]
 fn globals_in_repl() {
   let (out, _err) = util::run_and_collect_output_with_args(
diff --git a/cli/tests/testdata/compat/existing_import_map.json b/cli/tests/testdata/compat/existing_import_map.json
deleted file mode 100644
index db59c0cc2..000000000
--- a/cli/tests/testdata/compat/existing_import_map.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "imports": {
-    "fs/promises": "./non_existent_file.js"
-  }
-}
diff --git a/cli/tests/testdata/compat/existing_import_map.out b/cli/tests/testdata/compat/existing_import_map.out
deleted file mode 100644
index 46125d411..000000000
--- a/cli/tests/testdata/compat/existing_import_map.out
+++ /dev/null
@@ -1,7 +0,0 @@
-[WILDCARD]
-Some Node built-ins were not added to the import map:
-  - "fs/promises" already exists and is mapped to "file://[WILDCARD]/non_existent_file.js"
-If you want to use Node built-ins provided by Deno remove listed specifiers from "imports" mapping in the import map file.
-[WILDCARD]
-error: Cannot load module "file://[WILDCARD]/non_existent_file.js".
-    at file://[WILDCARD]/fs_promises.js:1:16
diff --git a/cli/tests/testdata/compat/fs_promises.js b/cli/tests/testdata/compat/fs_promises.mjs
index 3f7b4c935..3f7b4c935 100644
--- a/cli/tests/testdata/compat/fs_promises.js
+++ b/cli/tests/testdata/compat/fs_promises.mjs
diff --git a/cli/tests/testdata/compat/globals.out b/cli/tests/testdata/compat/globals.out
index 0bc09137b..32230fda3 100644
--- a/cli/tests/testdata/compat/globals.out
+++ b/cli/tests/testdata/compat/globals.out
@@ -2,6 +2,8 @@
 process {
 [WILDCARD]
 }
-[Function: Buffer]
+[Function: Buffer] {
+[WILDCARD]
+}
 [Function: setImmediate]
 [Function: clearTimeout]
diff --git a/cli/tests/testdata/compat/node_fs_promises.js b/cli/tests/testdata/compat/node_fs_promises.mjs
index b2174b22b..b2174b22b 100644
--- a/cli/tests/testdata/compat/node_fs_promises.js
+++ b/cli/tests/testdata/compat/node_fs_promises.mjs