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17x 90x 218x 129x 129x 129x 220x 36017x 122402x 51x 34220x 34220x 34220x 34220x 34220x 34220x 1671x 1671x 34220x 34220x 34220x 34220x 8629x 8629x 8629x 8629x 8445x 8445x 8445x 8445x 8629x 8629x 4873x 4873x 8629x 34220x 51x 51x 51x 51x 51x 51x 216x 216x 51x 51x 51x 51x 51x 42086x 51x 51x 2x 2x 1x 1x 2x 51x 51x 51x 51x 51x 120315x 120315x 120315x 120315x 120315x 120315x 120315x 51x 51x 10998x 10998x 10998x 10998x 10998x 51x 51x 51x 51x 51x 54834x 54834x 51x 51x 51x 51x 51x 53x 53x 51x 51x 51x 51x 51x 68x 68x 51x 51x 51x 51x 51x 14098x 14098x 51x 51x 51x 51x 51x 3791x 3791x 3791x 3791x 51x 51x 51x 51x 51x 57638x 57638x 51x 51x 51x 51x 51x 7159x 7159x 51x 51x 51x 51x 51x 9446x 9446x 51x 51x 51x 51x 51x 51x 2x 2x 51x 51x 51x 51x 51x 51x 4x 4x 4x 2x 4x 4x 51x 51x 51x 51x 51x 330x 330x 330x 330x 311x 330x 9x 9x 330x 330x 330x 51x 51x 51x 51x 220x 51x 51x 51x 2x 51x 51x 51x 51x 51x 51x 51x 51x 51x 51x 51x | // Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// A bit simpler than readable streams.
// Implement an async ._write(chunk, encoding, cb), and it'll handle all
// the drain event emission and buffering.
'use strict';
const {
ArrayPrototypeSlice,
Error,
FunctionPrototypeSymbolHasInstance,
ObjectDefineProperty,
ObjectDefineProperties,
ObjectSetPrototypeOf,
StringPrototypeToLowerCase,
Symbol,
SymbolHasInstance,
} = primordials;
module.exports = Writable;
Writable.WritableState = WritableState;
const EE = require('events');
const Stream = require('internal/streams/legacy').Stream;
const { Buffer } = require('buffer');
const destroyImpl = require('internal/streams/destroy');
const {
addAbortSignal,
} = require('internal/streams/add-abort-signal');
const {
getHighWaterMark,
getDefaultHighWaterMark
} = require('internal/streams/state');
const {
ERR_INVALID_ARG_TYPE,
ERR_METHOD_NOT_IMPLEMENTED,
ERR_MULTIPLE_CALLBACK,
ERR_STREAM_CANNOT_PIPE,
ERR_STREAM_DESTROYED,
ERR_STREAM_ALREADY_FINISHED,
ERR_STREAM_NULL_VALUES,
ERR_STREAM_WRITE_AFTER_END,
ERR_UNKNOWN_ENCODING
} = require('internal/errors').codes;
const { errorOrDestroy } = destroyImpl;
ObjectSetPrototypeOf(Writable.prototype, Stream.prototype);
ObjectSetPrototypeOf(Writable, Stream);
function nop() {}
const kOnFinished = Symbol('kOnFinished');
function WritableState(options, stream, isDuplex) {
// Duplex streams are both readable and writable, but share
// the same options object.
// However, some cases require setting options to different
// values for the readable and the writable sides of the duplex stream,
// e.g. options.readableObjectMode vs. options.writableObjectMode, etc.
if (typeof isDuplex !== 'boolean')
isDuplex = stream instanceof Stream.Duplex;
// Object stream flag to indicate whether or not this stream
// contains buffers or objects.
this.objectMode = !!(options && options.objectMode);
if (isDuplex)
this.objectMode = this.objectMode ||
!!(options && options.writableObjectMode);
// The point at which write() starts returning false
// Note: 0 is a valid value, means that we always return false if
// the entire buffer is not flushed immediately on write().
this.highWaterMark = options ?
getHighWaterMark(this, options, 'writableHighWaterMark', isDuplex) :
getDefaultHighWaterMark(false);
// if _final has been called.
this.finalCalled = false;
// drain event flag.
this.needDrain = false;
// At the start of calling end()
this.ending = false;
// When end() has been called, and returned.
this.ended = false;
// When 'finish' is emitted.
this.finished = false;
// Has it been destroyed
this.destroyed = false;
// Should we decode strings into buffers before passing to _write?
// this is here so that some node-core streams can optimize string
// handling at a lower level.
const noDecode = !!(options && options.decodeStrings === false);
this.decodeStrings = !noDecode;
// Crypto is kind of old and crusty. Historically, its default string
// encoding is 'binary' so we have to make this configurable.
// Everything else in the universe uses 'utf8', though.
this.defaultEncoding = (options && options.defaultEncoding) || 'utf8';
// Not an actual buffer we keep track of, but a measurement
// of how much we're waiting to get pushed to some underlying
// socket or file.
this.length = 0;
// A flag to see when we're in the middle of a write.
this.writing = false;
// When true all writes will be buffered until .uncork() call.
this.corked = 0;
// A flag to be able to tell if the onwrite cb is called immediately,
// or on a later tick. We set this to true at first, because any
// actions that shouldn't happen until "later" should generally also
// not happen before the first write call.
this.sync = true;
// A flag to know if we're processing previously buffered items, which
// may call the _write() callback in the same tick, so that we don't
// end up in an overlapped onwrite situation.
this.bufferProcessing = false;
// The callback that's passed to _write(chunk, cb).
this.onwrite = onwrite.bind(undefined, stream);
// The callback that the user supplies to write(chunk, encoding, cb).
this.writecb = null;
// The amount that is being written when _write is called.
this.writelen = 0;
// Storage for data passed to the afterWrite() callback in case of
// synchronous _write() completion.
this.afterWriteTickInfo = null;
resetBuffer(this);
// Number of pending user-supplied write callbacks
// this must be 0 before 'finish' can be emitted.
this.pendingcb = 0;
// Stream is still being constructed and cannot be
// destroyed until construction finished or failed.
// Async construction is opt in, therefore we start as
// constructed.
this.constructed = true;
// Emit prefinish if the only thing we're waiting for is _write cbs
// This is relevant for synchronous Transform streams.
this.prefinished = false;
// True if the error was already emitted and should not be thrown again.
this.errorEmitted = false;
// Should close be emitted on destroy. Defaults to true.
this.emitClose = !options || options.emitClose !== false;
// Should .destroy() be called after 'finish' (and potentially 'end').
this.autoDestroy = !options || options.autoDestroy !== false;
// Indicates whether the stream has errored. When true all write() calls
// should return false. This is needed since when autoDestroy
// is disabled we need a way to tell whether the stream has failed.
this.errored = null;
// Indicates whether the stream has finished destroying.
this.closed = false;
// True if close has been emitted or would have been emitted
// depending on emitClose.
this.closeEmitted = false;
this[kOnFinished] = [];
}
function resetBuffer(state) {
state.buffered = [];
state.bufferedIndex = 0;
state.allBuffers = true;
state.allNoop = true;
}
WritableState.prototype.getBuffer = function getBuffer() {
return ArrayPrototypeSlice(this.buffered, this.bufferedIndex);
};
ObjectDefineProperty(WritableState.prototype, 'bufferedRequestCount', {
__proto__: null,
get() {
return this.buffered.length - this.bufferedIndex;
}
});
function Writable(options) {
// Writable ctor is applied to Duplexes, too.
// `realHasInstance` is necessary because using plain `instanceof`
// would return false, as no `_writableState` property is attached.
// Trying to use the custom `instanceof` for Writable here will also break the
// Node.js LazyTransform implementation, which has a non-trivial getter for
// `_writableState` that would lead to infinite recursion.
// Checking for a Stream.Duplex instance is faster here instead of inside
// the WritableState constructor, at least with V8 6.5.
const isDuplex = (this instanceof Stream.Duplex);
if (!isDuplex && !FunctionPrototypeSymbolHasInstance(Writable, this))
return new Writable(options);
this._writableState = new WritableState(options, this, isDuplex);
if (options) {
if (typeof options.write === 'function')
this._write = options.write;
if (typeof options.writev === 'function')
this._writev = options.writev;
if (typeof options.destroy === 'function')
this._destroy = options.destroy;
if (typeof options.final === 'function')
this._final = options.final;
if (typeof options.construct === 'function')
this._construct = options.construct;
if (options.signal)
addAbortSignal(options.signal, this);
}
Stream.call(this, options);
destroyImpl.construct(this, () => {
const state = this._writableState;
if (!state.writing) {
clearBuffer(this, state);
}
finishMaybe(this, state);
});
}
ObjectDefineProperty(Writable, SymbolHasInstance, {
__proto__: null,
value: function(object) {
if (FunctionPrototypeSymbolHasInstance(this, object)) return true;
if (this !== Writable) return false;
return object && object._writableState instanceof WritableState;
},
});
// Otherwise people can pipe Writable streams, which is just wrong.
Writable.prototype.pipe = function() {
errorOrDestroy(this, new ERR_STREAM_CANNOT_PIPE());
};
function _write(stream, chunk, encoding, cb) {
const state = stream._writableState;
if (typeof encoding === 'function') {
cb = encoding;
encoding = state.defaultEncoding;
} else {
if (!encoding)
encoding = state.defaultEncoding;
else if (encoding !== 'buffer' && !Buffer.isEncoding(encoding))
throw new ERR_UNKNOWN_ENCODING(encoding);
if (typeof cb !== 'function')
cb = nop;
}
if (chunk === null) {
throw new ERR_STREAM_NULL_VALUES();
} else if (!state.objectMode) {
if (typeof chunk === 'string') {
if (state.decodeStrings !== false) {
chunk = Buffer.from(chunk, encoding);
encoding = 'buffer';
}
} else if (chunk instanceof Buffer) {
encoding = 'buffer';
} else if (Stream._isUint8Array(chunk)) {
chunk = Stream._uint8ArrayToBuffer(chunk);
encoding = 'buffer';
} else {
throw new ERR_INVALID_ARG_TYPE(
'chunk', ['string', 'Buffer', 'Uint8Array'], chunk);
}
}
let err;
if (state.ending) {
err = new ERR_STREAM_WRITE_AFTER_END();
} else if (state.destroyed) {
err = new ERR_STREAM_DESTROYED('write');
}
if (err) {
process.nextTick(cb, err);
errorOrDestroy(stream, err, true);
return err;
}
state.pendingcb++;
return writeOrBuffer(stream, state, chunk, encoding, cb);
}
Writable.prototype.write = function(chunk, encoding, cb) {
return _write(this, chunk, encoding, cb) === true;
};
Writable.prototype.cork = function() {
this._writableState.corked++;
};
Writable.prototype.uncork = function() {
const state = this._writableState;
if (state.corked) {
state.corked--;
if (!state.writing)
clearBuffer(this, state);
}
};
Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
// node::ParseEncoding() requires lower case.
if (typeof encoding === 'string')
encoding = StringPrototypeToLowerCase(encoding);
if (!Buffer.isEncoding(encoding))
throw new ERR_UNKNOWN_ENCODING(encoding);
this._writableState.defaultEncoding = encoding;
return this;
};
// If we're already writing something, then just put this
// in the queue, and wait our turn. Otherwise, call _write
// If we return false, then we need a drain event, so set that flag.
function writeOrBuffer(stream, state, chunk, encoding, callback) {
const len = state.objectMode ? 1 : chunk.length;
state.length += len;
// stream._write resets state.length
const ret = state.length < state.highWaterMark;
// We must ensure that previous needDrain will not be reset to false.
if (!ret)
state.needDrain = true;
if (state.writing || state.corked || state.errored || !state.constructed) {
state.buffered.push({ chunk, encoding, callback });
if (state.allBuffers && encoding !== 'buffer') {
state.allBuffers = false;
}
if (state.allNoop && callback !== nop) {
state.allNoop = false;
}
} else {
state.writelen = len;
state.writecb = callback;
state.writing = true;
state.sync = true;
stream._write(chunk, encoding, state.onwrite);
state.sync = false;
}
// Return false if errored or destroyed in order to break
// any synchronous while(stream.write(data)) loops.
return ret && !state.errored && !state.destroyed;
}
function doWrite(stream, state, writev, len, chunk, encoding, cb) {
state.writelen = len;
state.writecb = cb;
state.writing = true;
state.sync = true;
if (state.destroyed)
state.onwrite(new ERR_STREAM_DESTROYED('write'));
else if (writev)
stream._writev(chunk, state.onwrite);
else
stream._write(chunk, encoding, state.onwrite);
state.sync = false;
}
function onwriteError(stream, state, er, cb) {
--state.pendingcb;
cb(er);
// Ensure callbacks are invoked even when autoDestroy is
// not enabled. Passing `er` here doesn't make sense since
// it's related to one specific write, not to the buffered
// writes.
errorBuffer(state);
// This can emit error, but error must always follow cb.
errorOrDestroy(stream, er);
}
function onwrite(stream, er) {
const state = stream._writableState;
const sync = state.sync;
const cb = state.writecb;
if (typeof cb !== 'function') {
errorOrDestroy(stream, new ERR_MULTIPLE_CALLBACK());
return;
}
state.writing = false;
state.writecb = null;
state.length -= state.writelen;
state.writelen = 0;
if (er) {
// Avoid V8 leak, https://github.com/nodejs/node/pull/34103#issuecomment-652002364
er.stack; // eslint-disable-line no-unused-expressions
if (!state.errored) {
state.errored = er;
}
// In case of duplex streams we need to notify the readable side of the
// error.
if (stream._readableState && !stream._readableState.errored) {
stream._readableState.errored = er;
}
if (sync) {
process.nextTick(onwriteError, stream, state, er, cb);
} else {
onwriteError(stream, state, er, cb);
}
} else {
if (state.buffered.length > state.bufferedIndex) {
clearBuffer(stream, state);
}
if (sync) {
// It is a common case that the callback passed to .write() is always
// the same. In that case, we do not schedule a new nextTick(), but
// rather just increase a counter, to improve performance and avoid
// memory allocations.
if (state.afterWriteTickInfo !== null &&
state.afterWriteTickInfo.cb === cb) {
state.afterWriteTickInfo.count++;
} else {
state.afterWriteTickInfo = { count: 1, cb, stream, state };
process.nextTick(afterWriteTick, state.afterWriteTickInfo);
}
} else {
afterWrite(stream, state, 1, cb);
}
}
}
function afterWriteTick({ stream, state, count, cb }) {
state.afterWriteTickInfo = null;
return afterWrite(stream, state, count, cb);
}
function afterWrite(stream, state, count, cb) {
const needDrain = !state.ending && !stream.destroyed && state.length === 0 &&
state.needDrain;
if (needDrain) {
state.needDrain = false;
stream.emit('drain');
}
while (count-- > 0) {
state.pendingcb--;
cb();
}
if (state.destroyed) {
errorBuffer(state);
}
finishMaybe(stream, state);
}
// If there's something in the buffer waiting, then invoke callbacks.
function errorBuffer(state) {
if (state.writing) {
return;
}
for (let n = state.bufferedIndex; n < state.buffered.length; ++n) {
const { chunk, callback } = state.buffered[n];
const len = state.objectMode ? 1 : chunk.length;
state.length -= len;
callback(state.errored ?? new ERR_STREAM_DESTROYED('write'));
}
const onfinishCallbacks = state[kOnFinished].splice(0);
for (let i = 0; i < onfinishCallbacks.length; i++) {
onfinishCallbacks[i](state.errored ?? new ERR_STREAM_DESTROYED('end'));
}
resetBuffer(state);
}
// If there's something in the buffer waiting, then process it.
function clearBuffer(stream, state) {
if (state.corked ||
state.bufferProcessing ||
state.destroyed ||
!state.constructed) {
return;
}
const { buffered, bufferedIndex, objectMode } = state;
const bufferedLength = buffered.length - bufferedIndex;
if (!bufferedLength) {
return;
}
let i = bufferedIndex;
state.bufferProcessing = true;
if (bufferedLength > 1 && stream._writev) {
state.pendingcb -= bufferedLength - 1;
const callback = state.allNoop ? nop : (err) => {
for (let n = i; n < buffered.length; ++n) {
buffered[n].callback(err);
}
};
// Make a copy of `buffered` if it's going to be used by `callback` above,
// since `doWrite` will mutate the array.
const chunks = state.allNoop && i === 0 ?
buffered : ArrayPrototypeSlice(buffered, i);
chunks.allBuffers = state.allBuffers;
doWrite(stream, state, true, state.length, chunks, '', callback);
resetBuffer(state);
} else {
do {
const { chunk, encoding, callback } = buffered[i];
buffered[i++] = null;
const len = objectMode ? 1 : chunk.length;
doWrite(stream, state, false, len, chunk, encoding, callback);
} while (i < buffered.length && !state.writing);
if (i === buffered.length) {
resetBuffer(state);
} else if (i > 256) {
buffered.splice(0, i);
state.bufferedIndex = 0;
} else {
state.bufferedIndex = i;
}
}
state.bufferProcessing = false;
}
Writable.prototype._write = function(chunk, encoding, cb) {
if (this._writev) {
this._writev([{ chunk, encoding }], cb);
} else {
throw new ERR_METHOD_NOT_IMPLEMENTED('_write()');
}
};
Writable.prototype._writev = null;
Writable.prototype.end = function(chunk, encoding, cb) {
const state = this._writableState;
if (typeof chunk === 'function') {
cb = chunk;
chunk = null;
encoding = null;
} else if (typeof encoding === 'function') {
cb = encoding;
encoding = null;
}
let err;
if (chunk !== null && chunk !== undefined) {
const ret = _write(this, chunk, encoding);
if (ret instanceof Error) {
err = ret;
}
}
// .end() fully uncorks.
if (state.corked) {
state.corked = 1;
this.uncork();
}
if (err) {
// Do nothing...
} else if (!state.errored && !state.ending) {
// This is forgiving in terms of unnecessary calls to end() and can hide
// logic errors. However, usually such errors are harmless and causing a
// hard error can be disproportionately destructive. It is not always
// trivial for the user to determine whether end() needs to be called
// or not.
state.ending = true;
finishMaybe(this, state, true);
state.ended = true;
} else if (state.finished) {
err = new ERR_STREAM_ALREADY_FINISHED('end');
} else if (state.destroyed) {
err = new ERR_STREAM_DESTROYED('end');
}
if (typeof cb === 'function') {
if (err || state.finished) {
process.nextTick(cb, err);
} else {
state[kOnFinished].push(cb);
}
}
return this;
};
function needFinish(state) {
return (state.ending &&
!state.destroyed &&
state.constructed &&
state.length === 0 &&
!state.errored &&
state.buffered.length === 0 &&
!state.finished &&
!state.writing &&
!state.errorEmitted &&
!state.closeEmitted);
}
function callFinal(stream, state) {
let called = false;
function onFinish(err) {
if (called) {
errorOrDestroy(stream, err ?? ERR_MULTIPLE_CALLBACK());
return;
}
called = true;
state.pendingcb--;
if (err) {
const onfinishCallbacks = state[kOnFinished].splice(0);
for (let i = 0; i < onfinishCallbacks.length; i++) {
onfinishCallbacks[i](err);
}
errorOrDestroy(stream, err, state.sync);
} else if (needFinish(state)) {
state.prefinished = true;
stream.emit('prefinish');
// Backwards compat. Don't check state.sync here.
// Some streams assume 'finish' will be emitted
// asynchronously relative to _final callback.
state.pendingcb++;
process.nextTick(finish, stream, state);
}
}
state.sync = true;
state.pendingcb++;
try {
stream._final(onFinish);
} catch (err) {
onFinish(err);
}
state.sync = false;
}
function prefinish(stream, state) {
if (!state.prefinished && !state.finalCalled) {
if (typeof stream._final === 'function' && !state.destroyed) {
state.finalCalled = true;
callFinal(stream, state);
} else {
state.prefinished = true;
stream.emit('prefinish');
}
}
}
function finishMaybe(stream, state, sync) {
if (needFinish(state)) {
prefinish(stream, state);
if (state.pendingcb === 0) {
if (sync) {
state.pendingcb++;
process.nextTick((stream, state) => {
if (needFinish(state)) {
finish(stream, state);
} else {
state.pendingcb--;
}
}, stream, state);
} else if (needFinish(state)) {
state.pendingcb++;
finish(stream, state);
}
}
}
}
function finish(stream, state) {
state.pendingcb--;
state.finished = true;
const onfinishCallbacks = state[kOnFinished].splice(0);
for (let i = 0; i < onfinishCallbacks.length; i++) {
onfinishCallbacks[i]();
}
stream.emit('finish');
if (state.autoDestroy) {
// In case of duplex streams we need a way to detect
// if the readable side is ready for autoDestroy as well.
const rState = stream._readableState;
const autoDestroy = !rState || (
rState.autoDestroy &&
// We don't expect the readable to ever 'end'
// if readable is explicitly set to false.
(rState.endEmitted || rState.readable === false)
);
if (autoDestroy) {
stream.destroy();
}
}
}
ObjectDefineProperties(Writable.prototype, {
closed: {
__proto__: null,
get() {
return this._writableState ? this._writableState.closed : false;
}
},
destroyed: {
__proto__: null,
get() {
return this._writableState ? this._writableState.destroyed : false;
},
set(value) {
// Backward compatibility, the user is explicitly managing destroyed.
if (this._writableState) {
this._writableState.destroyed = value;
}
}
},
writable: {
__proto__: null,
get() {
const w = this._writableState;
// w.writable === false means that this is part of a Duplex stream
// where the writable side was disabled upon construction.
// Compat. The user might manually disable writable side through
// deprecated setter.
return !!w && w.writable !== false && !w.destroyed && !w.errored &&
!w.ending && !w.ended;
},
set(val) {
// Backwards compatible.
if (this._writableState) {
this._writableState.writable = !!val;
}
}
},
writableFinished: {
__proto__: null,
get() {
return this._writableState ? this._writableState.finished : false;
}
},
writableObjectMode: {
__proto__: null,
get() {
return this._writableState ? this._writableState.objectMode : false;
}
},
writableBuffer: {
__proto__: null,
get() {
return this._writableState && this._writableState.getBuffer();
}
},
writableEnded: {
__proto__: null,
get() {
return this._writableState ? this._writableState.ending : false;
}
},
writableNeedDrain: {
__proto__: null,
get() {
const wState = this._writableState;
if (!wState) return false;
return !wState.destroyed && !wState.ending && wState.needDrain;
}
},
writableHighWaterMark: {
__proto__: null,
get() {
return this._writableState && this._writableState.highWaterMark;
}
},
writableCorked: {
__proto__: null,
get() {
return this._writableState ? this._writableState.corked : 0;
}
},
writableLength: {
__proto__: null,
get() {
return this._writableState && this._writableState.length;
}
},
errored: {
__proto__: null,
enumerable: false,
get() {
return this._writableState ? this._writableState.errored : null;
}
},
writableAborted: {
__proto__: null,
enumerable: false,
get: function() {
return !!(
this._writableState.writable !== false &&
(this._writableState.destroyed || this._writableState.errored) &&
!this._writableState.finished
);
}
},
});
const destroy = destroyImpl.destroy;
Writable.prototype.destroy = function(err, cb) {
const state = this._writableState;
// Invoke pending callbacks.
if (!state.destroyed &&
(state.bufferedIndex < state.buffered.length ||
state[kOnFinished].length)) {
process.nextTick(errorBuffer, state);
}
destroy.call(this, err, cb);
return this;
};
Writable.prototype._undestroy = destroyImpl.undestroy;
Writable.prototype._destroy = function(err, cb) {
cb(err);
};
Writable.prototype[EE.captureRejectionSymbol] = function(err) {
this.destroy(err);
};
let webStreamsAdapters;
// Lazy to avoid circular references
function lazyWebStreams() {
if (webStreamsAdapters === undefined)
webStreamsAdapters = require('internal/webstreams/adapters');
return webStreamsAdapters;
}
Writable.fromWeb = function(writableStream, options) {
return lazyWebStreams().newStreamWritableFromWritableStream(
writableStream,
options);
};
Writable.toWeb = function(streamWritable) {
return lazyWebStreams().newWritableStreamFromStreamWritable(streamWritable);
};
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