fix(ext/node): discover .npmrc in user's homedir (#24021)

This commit adds discovery of `.npmrc` files in user's homedir.

This is not a perfect fix as it doesn't merge multiple `.npmrc` files
together as per https://github.com/denoland/deno/issues/23954
but allows to fallback if no `.npmrc` file is discovered in the project
root.

3 files changed, 15 insertions, 2 deletions

diff --git a/cli/args/mod.rs b/cli/args/mod.rs
index ccf00425b..9e63ce889 100644
--- a/cli/args/mod.rs
+++ b/cli/args/mod.rs
@@ -72,6 +72,7 @@ use std::sync::Arc;
 use thiserror::Error;
 
 use crate::args::import_map::enhance_import_map_value_with_workspace_members;
+use crate::cache;
 use crate::file_fetcher::FileFetcher;
 use crate::util::fs::canonicalize_path_maybe_not_exists;
 use crate::version;
@@ -592,6 +593,7 @@ pub fn discover_npmrc(
     Ok(Arc::new(resolved))
   }
 
+  // 1. Try `.npmrc` next to `package.json`
   if let Some(package_json_path) = maybe_package_json_path {
     if let Some(package_json_dir) = package_json_path.parent() {
       if let Some((source, path)) = try_to_read_npmrc(package_json_dir)? {
@@ -600,6 +602,7 @@ pub fn discover_npmrc(
     }
   }
 
+  // 2. Try `.npmrc` next to `deno.json(c)`
   if let Some(deno_json_path) = maybe_deno_json_path {
     if let Some(deno_json_dir) = deno_json_path.parent() {
       if let Some((source, path)) = try_to_read_npmrc(deno_json_dir)? {
@@ -608,6 +611,15 @@ pub fn discover_npmrc(
     }
   }
 
+  // TODO(bartlomieju): update to read both files - one in the project root and one and
+  // home dir and then merge them.
+  // 3. Try `.npmrc` in the user's home directory
+  if let Some(home_dir) = cache::home_dir() {
+    if let Some((source, path)) = try_to_read_npmrc(&home_dir)? {
+      return try_to_parse_npmrc(source, &path).map(|r| (r, Some(path)));
+    }
+  }
+
   log::debug!("No .npmrc file found");
   Ok((create_default_npmrc(), None))
 }
diff --git a/cli/cache/deno_dir.rs b/cli/cache/deno_dir.rs
index 00df41c5a..05de1cf7c 100644
--- a/cli/cache/deno_dir.rs
+++ b/cli/cache/deno_dir.rs
@@ -169,7 +169,7 @@ impl DenoDir {
 
 /// To avoid the poorly managed dirs crate
 #[cfg(not(windows))]
-mod dirs {
+pub mod dirs {
   use std::path::PathBuf;
 
   pub fn cache_dir() -> Option<PathBuf> {
@@ -227,7 +227,7 @@ mod dirs {
 // https://github.com/dirs-dev/dirs-sys-rs/blob/ec7cee0b3e8685573d847f0a0f60aae3d9e07fa2/src/lib.rs#L140-L164
 // MIT license. Copyright (c) 2018-2019 dirs-rs contributors
 #[cfg(windows)]
-mod dirs {
+pub mod dirs {
   use std::ffi::OsString;
   use std::os::windows::ffi::OsStringExt;
   use std::path::PathBuf;
diff --git a/cli/cache/mod.rs b/cli/cache/mod.rs
index 64d046c15..3430f74f7 100644
--- a/cli/cache/mod.rs
+++ b/cli/cache/mod.rs
@@ -43,6 +43,7 @@ pub use caches::Caches;
 pub use check::TypeCheckCache;
 pub use code_cache::CodeCache;
 pub use common::FastInsecureHasher;
+pub use deno_dir::dirs::home_dir;
 pub use deno_dir::DenoDir;
 pub use deno_dir::DenoDirProvider;
 pub use disk_cache::DiskCache;