feat: add --compat flag to provide built-in Node modules (#12293)

This commit adds "--compat" flag. When the flag is passed a set of mappings for
built-in Node modules is injected into the import map. If user doesn't
explicitly provide an import map (using "--import-map" flag) then a map is
created on the fly. If there are already existing mappings in import map that
would clash with built-in Node modules a set of diagnostics is printed to the
terminal with suggestions how to proceed.

1 files changed, 3 insertions, 0 deletions

diff --git a/cli/tests/testdata/compat/fs_promises.js b/cli/tests/testdata/compat/fs_promises.js
new file mode 100644
index 000000000..3f7b4c935
--- /dev/null
+++ b/cli/tests/testdata/compat/fs_promises.js
@@ -0,0 +1,3 @@
+import fs from "fs/promises";
+const data = await fs.readFile("compat/test.txt", "utf-8");
+console.log(data);