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stream: remove thenable support #40773

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Apr 8, 2022
Merged

stream: remove thenable support #40773

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3d2064b
stream: remove thenable support
ronag Nov 10, 2021
ae07236
Update doc/api/deprecations.md
ronag Apr 6, 2022
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6 changes: 5 additions & 1 deletion doc/api/deprecations.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3022,11 +3022,15 @@ changes:
- version:
- v17.2.0
- v16.14.0
- version: REPLACEME
pr-url: https://github.com/nodejs/node/pull/40773
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description: End-of-life.
- version: v17.2.0
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pr-url: https://github.com/nodejs/node/pull/40860
description: Documentation-only deprecation.
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-->

Type: Documentation-only
Type: End-of-Life

An undocumented feature of Node.js streams was to support thenables in
implementation methods. This is now deprecated, use callbacks instead and avoid
Expand Down
34 changes: 2 additions & 32 deletions lib/internal/streams/destroy.js
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Original file line number Diff line number Diff line change
Expand Up @@ -106,20 +106,7 @@ function _destroy(self, err, cb) {
}
}
try {
const result = self._destroy(err || null, onDestroy);
if (result != null) {
const then = result.then;
if (typeof then === 'function') {
then.call(
result,
function() {
process.nextTick(onDestroy, null);
},
function(err) {
process.nextTick(onDestroy, err);
});
}
}
self._destroy(err || null, onDestroy);
} catch (err) {
onDestroy(err);
}
Expand Down Expand Up @@ -285,24 +272,7 @@ function constructNT(stream) {
}

try {
const result = stream._construct(onConstruct);
if (result != null) {
const then = result.then;
if (typeof then === 'function') {
then.call(
result,
function() {
if (!called) {
process.nextTick(onConstruct, null);
}
},
function(err) {
if (!called) {
process.nextTick(onConstruct, err);
}
});
}
}
stream._construct(onConstruct);
} catch (err) {
onConstruct(err);
}
Expand Down
13 changes: 1 addition & 12 deletions lib/internal/streams/readable.js
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Original file line number Diff line number Diff line change
Expand Up @@ -493,18 +493,7 @@ Readable.prototype.read = function(n) {

// Call internal read method
try {
const result = this._read(state.highWaterMark);
if (result != null) {
const then = result.then;
if (typeof then === 'function') {
then.call(
result,
nop,
function(err) {
errorOrDestroy(this, err);
});
}
}
this._read(state.highWaterMark);
} catch (err) {
errorOrDestroy(this, err);
}
Expand Down
67 changes: 2 additions & 65 deletions lib/internal/streams/transform.js
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Original file line number Diff line number Diff line change
Expand Up @@ -107,10 +107,8 @@ function Transform(options) {
}

function final(cb) {
let called = false;
if (typeof this._flush === 'function' && !this.destroyed) {
const result = this._flush((er, data) => {
called = true;
this._flush((er, data) => {
if (er) {
if (cb) {
cb(er);
Expand All @@ -128,33 +126,6 @@ function final(cb) {
cb();
}
});
if (result !== undefined && result !== null) {
try {
const then = result.then;
if (typeof then === 'function') {
then.call(
result,
(data) => {
if (called)
return;
if (data != null)
this.push(data);
this.push(null);
if (cb)
process.nextTick(cb);
},
(err) => {
if (cb) {
process.nextTick(cb, err);
} else {
process.nextTick(() => this.destroy(err));
}
});
}
} catch (err) {
process.nextTick(() => this.destroy(err));
}
}
} else {
this.push(null);
if (cb) {
Expand All @@ -180,9 +151,7 @@ Transform.prototype._write = function(chunk, encoding, callback) {
const wState = this._writableState;
const length = rState.length;

let called = false;
const result = this._transform(chunk, encoding, (err, val) => {
called = true;
this._transform(chunk, encoding, (err, val) => {
if (err) {
callback(err);
return;
Expand All @@ -204,38 +173,6 @@ Transform.prototype._write = function(chunk, encoding, callback) {
this[kCallback] = callback;
}
});
if (result !== undefined && result != null) {
try {
const then = result.then;
if (typeof then === 'function') {
then.call(
result,
(val) => {
if (called)
return;

if (val != null) {
this.push(val);
}

if (
wState.ended ||
length === rState.length ||
rState.length < rState.highWaterMark ||
rState.length === 0) {
process.nextTick(callback);
} else {
this[kCallback] = callback;
}
},
(err) => {
process.nextTick(callback, err);
});
}
} catch (err) {
process.nextTick(callback, err);
}
}
};

Transform.prototype._read = function() {
Expand Down
19 changes: 1 addition & 18 deletions lib/internal/streams/writable.js
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Original file line number Diff line number Diff line change
Expand Up @@ -693,24 +693,7 @@ function callFinal(stream, state) {
state.pendingcb++;

try {
const result = stream._final(onFinish);
if (result != null) {
const then = result.then;
if (typeof then === 'function') {
then.call(
result,
function() {
if (!called) {
process.nextTick(onFinish, null);
}
},
function(err) {
if (!called) {
process.nextTick(onFinish, err);
}
});
}
}
stream._final(onFinish);
} catch (err) {
onFinish(err);
}
Expand Down
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