1 files changed, 38 insertions, 0 deletions
diff --git a/cli/js/web/streams/symbols.ts b/cli/js/web/streams/symbols.ts
new file mode 100644
index 000000000..9d6335ef0
--- /dev/null
+++ b/cli/js/web/streams/symbols.ts
@@ -0,0 +1,38 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+// The specification refers to internal slots.  In most cases, ECMAScript
+// Private Fields are not sufficient for these, as they are often accessed
+// outside of the class itself and using a WeakMap gets really complex to hide
+// this data from the public, therefore we will use unique symbols which are
+// not available in the runtime.
+
+export const asyncIteratorReader = Symbol("asyncIteratorReader");
+export const autoAllocateChunkSize = Symbol("autoAllocateChunkSize");
+export const byobRequest = Symbol("byobRequest");
+export const cancelAlgorithm = Symbol("cancelAlgorithm");
+export const cancelSteps = Symbol("cancelSteps");
+export const closedPromise = Symbol("closedPromise");
+export const closeRequested = Symbol("closeRequested");
+export const controlledReadableByteStream = Symbol(
+  "controlledReadableByteStream"
+);
+export const controlledReadableStream = Symbol("controlledReadableStream");
+export const disturbed = Symbol("disturbed");
+export const forAuthorCode = Symbol("forAuthorCode");
+export const isFakeDetached = Symbol("isFakeDetached");
+export const ownerReadableStream = Symbol("ownerReadableStream");
+export const preventCancel = Symbol("preventCancel");
+export const pullAgain = Symbol("pullAgain");
+export const pullAlgorithm = Symbol("pullAlgorithm");
+export const pulling = Symbol("pulling");
+export const pullSteps = Symbol("pullSteps");
+export const queue = Symbol("queue");
+export const queueTotalSize = Symbol("queueTotalSize");
+export const readableStreamController = Symbol("readableStreamController");
+export const reader = Symbol("reader");
+export const readRequests = Symbol("readRequests");
+export const started = Symbol("started");
+export const state = Symbol("state");
+export const storedError = Symbol("storedError");
+export const strategyHWM = Symbol("strategyHWM");
+export const strategySizeAlgorithm = Symbol("strategySizeAlgorithm");