/usr/lib/nodejs/p-cancelable/index.js is in node-p-cancelable 0.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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class CancelError extends Error {
constructor() {
super('Promise was canceled');
this.name = 'CancelError';
}
}
class PCancelable {
static fn(fn) {
return function () {
const args = [].slice.apply(arguments);
return new PCancelable((onCancel, resolve, reject) => {
args.unshift(onCancel);
fn.apply(null, args).then(resolve, reject);
});
};
}
constructor(executor) {
this._pending = true;
this._canceled = false;
this._promise = new Promise((resolve, reject) => {
this._reject = reject;
return executor(
fn => {
this._cancel = fn;
},
val => {
this._pending = false;
resolve(val);
},
err => {
this._pending = false;
reject(err);
}
);
});
}
then() {
return this._promise.then.apply(this._promise, arguments);
}
catch() {
return this._promise.catch.apply(this._promise, arguments);
}
cancel() {
if (!this._pending || this._canceled) {
return;
}
if (typeof this._cancel === 'function') {
try {
this._cancel();
} catch (err) {
this._reject(err);
}
}
this._canceled = true;
this._reject(new CancelError());
}
get canceled() {
return this._canceled;
}
}
Object.setPrototypeOf(PCancelable.prototype, Promise.prototype);
module.exports = PCancelable;
module.exports.CancelError = CancelError;
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