WritableStream.locked

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The locked read-only property of the WritableStream interface returns a boolean indicating whether the WritableStream is locked to a writer.

Syntax

var locked = writableStream.locked;

Value

A boolean value indicating whether or not the writable stream is locked.

Examples

const writableStream = new WritableStream({
  write(chunk) {
    ...
  },
  close() {
    ...
  },
  abort(err) {
    ...
  }
}, queuingStrategy);

...

const writer = writableStream.getWriter();

writableStream.locked
// should return true, as the stream has been locked to a writer

Specifications

Specification
Streams Standard (Streams) # ref-for-ws-locked②

Browser compatibility

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