add hw2

node_modules/readable-stream/lib/ours/util.js

@@ -0,0 +1,148 @@
+'use strict'
+
+const bufferModule = require('buffer')
+const { format, inspect } = require('./util/inspect')
+const {
+  codes: { ERR_INVALID_ARG_TYPE }
+} = require('./errors')
+const { kResistStopPropagation, AggregateError, SymbolDispose } = require('./primordials')
+const AbortSignal = globalThis.AbortSignal || require('abort-controller').AbortSignal
+const AbortController = globalThis.AbortController || require('abort-controller').AbortController
+const AsyncFunction = Object.getPrototypeOf(async function () {}).constructor
+const Blob = globalThis.Blob || bufferModule.Blob
+/* eslint-disable indent */
+const isBlob =
+  typeof Blob !== 'undefined'
+    ? function isBlob(b) {
+        // eslint-disable-next-line indent
+        return b instanceof Blob
+      }
+    : function isBlob(b) {
+        return false
+      }
+/* eslint-enable indent */
+
+const validateAbortSignal = (signal, name) => {
+  if (signal !== undefined && (signal === null || typeof signal !== 'object' || !('aborted' in signal))) {
+    throw new ERR_INVALID_ARG_TYPE(name, 'AbortSignal', signal)
+  }
+}
+const validateFunction = (value, name) => {
+  if (typeof value !== 'function') {
+    throw new ERR_INVALID_ARG_TYPE(name, 'Function', value)
+  }
+}
+module.exports = {
+  AggregateError,
+  kEmptyObject: Object.freeze({}),
+  once(callback) {
+    let called = false
+    return function (...args) {
+      if (called) {
+        return
+      }
+      called = true
+      callback.apply(this, args)
+    }
+  },
+  createDeferredPromise: function () {
+    let resolve
+    let reject
+
+    // eslint-disable-next-line promise/param-names
+    const promise = new Promise((res, rej) => {
+      resolve = res
+      reject = rej
+    })
+    return {
+      promise,
+      resolve,
+      reject
+    }
+  },
+  promisify(fn) {
+    return new Promise((resolve, reject) => {
+      fn((err, ...args) => {
+        if (err) {
+          return reject(err)
+        }
+        return resolve(...args)
+      })
+    })
+  },
+  debuglog() {
+    return function () {}
+  },
+  format,
+  inspect,
+  types: {
+    isAsyncFunction(fn) {
+      return fn instanceof AsyncFunction
+    },
+    isArrayBufferView(arr) {
+      return ArrayBuffer.isView(arr)
+    }
+  },
+  isBlob,
+  deprecate(fn, message) {
+    return fn
+  },
+  addAbortListener:
+    require('events').addAbortListener ||
+    function addAbortListener(signal, listener) {
+      if (signal === undefined) {
+        throw new ERR_INVALID_ARG_TYPE('signal', 'AbortSignal', signal)
+      }
+      validateAbortSignal(signal, 'signal')
+      validateFunction(listener, 'listener')
+      let removeEventListener
+      if (signal.aborted) {
+        queueMicrotask(() => listener())
+      } else {
+        signal.addEventListener('abort', listener, {
+          __proto__: null,
+          once: true,
+          [kResistStopPropagation]: true
+        })
+        removeEventListener = () => {
+          signal.removeEventListener('abort', listener)
+        }
+      }
+      return {
+        __proto__: null,
+        [SymbolDispose]() {
+          var _removeEventListener
+          ;(_removeEventListener = removeEventListener) === null || _removeEventListener === undefined
+            ? undefined
+            : _removeEventListener()
+        }
+      }
+    },
+  AbortSignalAny:
+    AbortSignal.any ||
+    function AbortSignalAny(signals) {
+      // Fast path if there is only one signal.
+      if (signals.length === 1) {
+        return signals[0]
+      }
+      const ac = new AbortController()
+      const abort = () => ac.abort()
+      signals.forEach((signal) => {
+        validateAbortSignal(signal, 'signals')
+        signal.addEventListener('abort', abort, {
+          once: true
+        })
+      })
+      ac.signal.addEventListener(
+        'abort',
+        () => {
+          signals.forEach((signal) => signal.removeEventListener('abort', abort))
+        },
+        {
+          once: true
+        }
+      )
+      return ac.signal
+    }
+}
+module.exports.promisify.custom = Symbol.for('nodejs.util.promisify.custom')