feat(unstable): `deno run --env` (#20300)

This change adds the `--env=[FILE]` flag to the `run`, `compile`,
`eval`, `install` and `repl` subcommands. Environment variables set in
the CLI overwrite those defined in the `.env` file.

1 files changed, 7 insertions, 0 deletions

diff --git a/cli/args/mod.rs b/cli/args/mod.rs
index 94eaf2a3e..b8b0a81f5 100644
--- a/cli/args/mod.rs
+++ b/cli/args/mod.rs
@@ -52,6 +52,7 @@ use deno_runtime::deno_tls::rustls_pemfile;
 use deno_runtime::deno_tls::webpki_roots;
 use deno_runtime::inspector_server::InspectorServer;
 use deno_runtime::permissions::PermissionsOptions;
+use dotenvy::from_filename;
 use once_cell::sync::Lazy;
 use once_cell::sync::OnceCell;
 use serde::Deserialize;
@@ -651,6 +652,12 @@ impl CliOptions {
     let maybe_vendor_folder =
       resolve_vendor_folder(&initial_cwd, &flags, maybe_config_file.as_ref());
 
+    if let Some(env_file_name) = &flags.env_file {
+      if (from_filename(env_file_name)).is_err() {
+        bail!("Unable to load '{env_file_name}' environment variable file")
+      }
+    }
+
     Ok(Self {
       flags,
       initial_cwd,