From e6c49d14b1ea6331d2e13f7a0b74a0e41c142596 Mon Sep 17 00:00:00 2001
From: Leo Kettmeir <crowlkats@toaxl.com>
Date: Mon, 9 Jan 2023 20:19:55 +0100
Subject: feat(runtime/os): add `Deno.env.has()` (#17315)

---
 cli/tests/unit/os_test.ts    |  7 +++++++
 cli/tsc/dts/lib.deno.ns.d.ts | 13 +++++++++++++
 2 files changed, 20 insertions(+)

(limited to 'cli')

diff --git a/cli/tests/unit/os_test.ts b/cli/tests/unit/os_test.ts
index 81f912bcc..667c3cc81 100644
--- a/cli/tests/unit/os_test.ts
+++ b/cli/tests/unit/os_test.ts
@@ -26,6 +26,13 @@ Deno.test({ permissions: { env: true } }, function deleteEnv() {
   assertEquals(Deno.env.get("TEST_VAR"), undefined);
 });
 
+Deno.test({ permissions: { env: true } }, function hasEnv() {
+  Deno.env.set("TEST_VAR", "A");
+  assert(Deno.env.has("TEST_VAR"));
+  Deno.env.delete("TEST_VAR");
+  assert(!Deno.env.has("TEST_VAR"));
+});
+
 Deno.test({ permissions: { env: true } }, function avoidEmptyNamedEnv() {
   assertThrows(() => Deno.env.set("", "v"), TypeError);
   assertThrows(() => Deno.env.set("a=a", "v"), TypeError);
diff --git a/cli/tsc/dts/lib.deno.ns.d.ts b/cli/tsc/dts/lib.deno.ns.d.ts
index ab53a064e..5941a5d57 100644
--- a/cli/tsc/dts/lib.deno.ns.d.ts
+++ b/cli/tsc/dts/lib.deno.ns.d.ts
@@ -1231,6 +1231,19 @@ declare namespace Deno {
      */
     delete(key: string): void;
 
+    /** Check whether an environment variable is present or not.
+     *
+     * ```ts
+     * Deno.env.set("SOME_VAR", "Value");
+     * Deno.env.has("SOME_VAR");  // outputs true
+     * ```
+     *
+     * Requires `allow-env` permission.
+     *
+     * @tags allow-env
+     */
+    has(key: string): boolean;
+
     /** Returns a snapshot of the environment variables at invocation as a
      * simple object of keys and values.
      *
-- 
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