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  • License MIT

Does this environment have the ability to get the [[Prototype]] of an object on creation with `__proto__`?

Package Exports

  • has-proto
  • has-proto/accessor
  • has-proto/mutator
  • has-proto/package.json

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Does this environment have the ability to set the [[Prototype]] of an object on creation with __proto__?

Example

var hasProto = require('has-proto');
var assert = require('assert');

assert.equal(typeof hasProto(), 'boolean');

var hasProtoAccessor = require('has-proto/accessor')();
if (hasProtoAccessor) {
    assert.equal([].__proto__, Array.prototype);
} else {
    assert(!('__proto__' in Object.prototype));
}

var hasProtoMutator = require('has-proto/mutator');
var obj = {};
assert('toString' in obj);

obj.__proto__ = null;
if (hasProtoMutator) {
    assert(!('toString' in obj));
} else {
    assert('toString' in obj);
    assert.equal(obj.__proto__, null);
}

Tests

Simply clone the repo, npm install, and run npm test