1 files changed, 28 insertions, 0 deletions
diff --git a/runtime/rt/40_tty.js b/runtime/rt/40_tty.js
new file mode 100644
index 000000000..598d33237
--- /dev/null
+++ b/runtime/rt/40_tty.js
@@ -0,0 +1,28 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+((window) => {
+  const core = window.Deno.core;
+
+  function consoleSize(rid) {
+    return core.jsonOpSync("op_console_size", { rid });
+  }
+
+  function isatty(rid) {
+    return core.jsonOpSync("op_isatty", { rid });
+  }
+
+  const DEFAULT_SET_RAW_OPTIONS = {
+    cbreak: false,
+  };
+
+  function setRaw(rid, mode, options = {}) {
+    const rOptions = { ...DEFAULT_SET_RAW_OPTIONS, ...options };
+    core.jsonOpSync("op_set_raw", { rid, mode, options: rOptions });
+  }
+
+  window.__bootstrap.tty = {
+    consoleSize,
+    isatty,
+    setRaw,
+  };
+})(this);