feat: Add support for passing a key to Deno.env() (#2952)

This adds a new op to get a single env var.

1 files changed, 12 insertions, 0 deletions

diff --git a/cli/deno_error.rs b/cli/deno_error.rs
index eb885adb8..551547e26 100644
--- a/cli/deno_error.rs
+++ b/cli/deno_error.rs
@@ -11,6 +11,7 @@ use hyper;
 use reqwest;
 use rustyline::error::ReadlineError;
 use std;
+use std::env::VarError;
 use std::error::Error;
 use std::fmt;
 use std::io;
@@ -136,6 +137,16 @@ impl GetErrorKind for ModuleResolutionError {
   }
 }
 
+impl GetErrorKind for VarError {
+  fn kind(&self) -> ErrorKind {
+    use VarError::*;
+    match self {
+      NotPresent => ErrorKind::NotFound,
+      NotUnicode(..) => ErrorKind::InvalidData,
+    }
+  }
+}
+
 impl GetErrorKind for io::Error {
   fn kind(&self) -> ErrorKind {
     use io::ErrorKind::*;
@@ -294,6 +305,7 @@ impl GetErrorKind for dyn AnyError {
       .or_else(|| self.downcast_ref::<StaticError>().map(Get::kind))
       .or_else(|| self.downcast_ref::<uri::InvalidUri>().map(Get::kind))
       .or_else(|| self.downcast_ref::<url::ParseError>().map(Get::kind))
+      .or_else(|| self.downcast_ref::<VarError>().map(Get::kind))
       .or_else(|| self.downcast_ref::<ReadlineError>().map(Get::kind))
       .or_else(|| {
         self