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Chris Tate
447f56e5c3
- EventEmitter.defaultMaxListeners on the untyped constructor is Node's
accessor over the default the typed EventEmitter reads: assignments
validate as validateNumber(arg, 'defaultMaxListeners', 0) does, and
getMaxListeners() of emitters without their own limit answers the new
value.
- dyn.builtinInstanceOf and dyn.functionInstanceOf link the
constructor-function unit and the units it calls (dyn-invoke, inspect,
symbol, emitter), so a program whose only use is `this instanceof F`
links.
- The legacy pipe's cleanup runs once: when the destination emits
'close' from end(), the cleanup still queued on the source's 'end'
finds the listeners removed and emit('end') answers true.
16 lines
651 B
JavaScript
16 lines
651 B
JavaScript
// `this instanceof F` in a constructor function, in a program that uses no
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// EventEmitter or stream constructor value: the call-without-new idiom
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// returns a new instance, and instanceof follows the function's prototype.
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"use strict";
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function Glob(pattern) {
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if (!(this instanceof Glob)) return new Glob(pattern);
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this.pattern = pattern;
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}
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Glob.prototype.describe = function () {
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return `glob ${this.pattern}`;
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};
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const called = Glob("*.ts");
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const constructed = new Glob("*.js");
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console.log(called.describe(), constructed.describe());
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console.log(called instanceof Glob, {} instanceof Glob, Object.create(Glob.prototype) instanceof Glob);
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