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zlib: refactor zlib module #11391

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zlib: refactor zlib module #11391

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fd70000
util: add createClassWrapper to internal/util
jasnell Feb 15, 2017
8badc1c
zlib: refactor zlib module
jasnell Feb 15, 2017
dacb5e6
zlib: use RangeError/TypeError consistently
jasnell Feb 15, 2017
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20 changes: 20 additions & 0 deletions lib/internal/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -186,3 +186,23 @@ exports.toLength = function toLength(argument) {
const len = toInteger(argument);
return len <= 0 ? 0 : Math.min(len, Number.MAX_SAFE_INTEGER);
};

// Useful for Wrapping an ES6 Class with a constructor Function that
// does not require the new keyword. For instance:
// class A { constructor(x) {this.x = x;}}
// const B = createClassWrapper(A);
// B() instanceof A // true
// B() instanceof B // true
exports.createClassWrapper = function createClassWrapper(type) {
const fn = function(...args) {
return Reflect.construct(type, args, new.target || type);
};
// Mask the wrapper function name and length values
Object.defineProperties(fn, {
name: {value: type.name},
length: {value: type.length}
});
Object.setPrototypeOf(fn, type);
fn.prototype = type.prototype;
return fn;
};
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