property internal.Duplex.prototype.allowHalfOpen
Usage in Deno
```typescript import { internal } from "node:node__stream.d.ts"; ```If `false` then the stream will automatically end the writable side when the
readable side ends. Set initially by the `allowHalfOpen` constructor option,
which defaults to `true`.
This can be changed manually to change the half-open behavior of an existing
`Duplex` stream instance, but must be changed before the `'end'` event is emitted.
boolean