new stream.Readable([options])

• options <Object>

  • highWaterMark <number> 在停止从底层资源读取之前存储在内部缓冲区中的最大 字节数。默认值：65536 (64 KiB)，或 16 用于 objectMode 流。

    ¥highWaterMark <number> The maximum number of bytes to store in the internal buffer before ceasing to read from the underlying resource. Default: 65536 (64 KiB), or 16 for objectMode streams.

  • encoding <string> 如果指定，则缓冲区将使用指定的编码解码为字符串。默认值：null。

    ¥encoding <string> If specified, then buffers will be decoded to strings using the specified encoding. Default: null.

  • objectMode <boolean> 此流是否应表现为对象流。这意味着 stream.read(n) 返回单个值，而不是大小为 n 的 Buffer。默认值：false。

    ¥objectMode <boolean> Whether this stream should behave as a stream of objects. Meaning that stream.read(n) returns a single value instead of a Buffer of size n. Default: false.

  • emitClose <boolean> 流被销毁后是否应该触发 'close'。默认值：true。

    ¥emitClose <boolean> Whether or not the stream should emit 'close' after it has been destroyed. Default: true.

  • read <Function> stream._read() 方法的实现。

    ¥read <Function> Implementation for the stream._read() method.

  • destroy <Function> stream._destroy() 方法的实现。

    ¥destroy <Function> Implementation for the stream._destroy() method.

  • construct <Function> stream._construct() 方法的实现。

    ¥construct <Function> Implementation for the stream._construct() method.

  • autoDestroy <boolean> 此流是否应在结束后自动调用自身的 .destroy()。默认值：true。

    ¥autoDestroy <boolean> Whether this stream should automatically call .destroy() on itself after ending. Default: true.

  • signal <AbortSignal> 表示可能取消的信号。

    ¥signal <AbortSignal> A signal representing possible cancellation.

const { Readable } = require('node:stream');

class MyReadable extends Readable {
  constructor(options) {
    // Calls the stream.Readable(options) constructor.
    super(options);
    // ...
  }
} 拷贝

或者，当使用 ES6 之前的样式构造函数时：

¥Or, when using pre-ES6 style constructors:

const { Readable } = require('node:stream');
const util = require('node:util');

function MyReadable(options) {
  if (!(this instanceof MyReadable))
    return new MyReadable(options);
  Readable.call(this, options);
}
util.inherits(MyReadable, Readable); 拷贝

或者，使用简化的构造函数方法：

¥Or, using the simplified constructor approach:

const { Readable } = require('node:stream');

const myReadable = new Readable({
  read(size) {
    // ...
  },
}); 拷贝

在对应于传递的 AbortSignal 的 AbortController 上调用 abort 的行为方式与在创建的可读对象上调用 .destroy(new AbortError()) 的方式相同。

¥Calling abort on the AbortController corresponding to the passed AbortSignal will behave the same way as calling .destroy(new AbortError()) on the readable created.

const { Readable } = require('node:stream');
const controller = new AbortController();
const read = new Readable({
  read(size) {
    // ...
  },
  signal: controller.signal,
});
// Later, abort the operation closing the stream
controller.abort(); 拷贝