2 files changed, 15 insertions, 0 deletions
diff --git a/cli/js/lib.deno.ns.d.ts b/cli/js/lib.deno.ns.d.ts
index c79007ebd..972405680 100644
--- a/cli/js/lib.deno.ns.d.ts
+++ b/cli/js/lib.deno.ns.d.ts
@@ -130,6 +130,16 @@ declare namespace Deno {
      * Requires `allow-env` permission. */
     set(key: string, value: string): void;
 
+    /** Delete the value of an environment variable.
+     *
+     * ```ts
+     * Deno.env.set("SOME_VAR", "Value"));
+     * Deno.env.delete("SOME_VAR");  // outputs "Undefined"
+     * ```
+     *
+     * Requires `allow-env` permission. */
+    delete(key: string): void;
+
     /** Returns a snapshot of the environment variables at invocation.
      *
      * ```ts
diff --git a/cli/js/ops/os.ts b/cli/js/ops/os.ts
index 30aa6d0d4..e63d8b358 100644
--- a/cli/js/ops/os.ts
+++ b/cli/js/ops/os.ts
@@ -27,12 +27,17 @@ function getEnv(key: string): string | undefined {
   return sendSync("op_get_env", { key })[0];
 }
 
+function deleteEnv(key: string): void {
+  sendSync("op_delete_env", { key });
+}
+
 export const env = {
   get: getEnv,
   toObject(): { [key: string]: string } {
     return sendSync("op_env");
   },
   set: setEnv,
+  delete: deleteEnv,
 };
 
 type DirKind =