mezzanine/lib/to-fast-props.js

Fantasy land union types with pattern matching

'use strict';Object.defineProperty(exports, "__esModule", { value: true });

var fastProto = null;

// Creates an object with permanently fast properties in V8. See Toon Verwaest's
// post https://medium.com/@tverwaes/setting-up-prototypes-in-v8-ec9c9491dfe2#5f62
// for more details. Use %HasFastProperties(object) and the Node flag
// --allow-natives-syntax to check whether an object has fast properties.
function FastObject(o) {
  // A prototype object will have "fast properties" enabled once it is checked
  // against the inline property cache of a function, e.g. fastProto.property:
  // https://github.com/v8/v8/blob/6.0.122/test/mjsunit/fast-prototype.js#L48-L63
  //$FlowIssue
  if (fastProto !== null && typeof fastProto.property) {
    var result = fastProto;
    fastProto = FastObject.prototype = null;
    return result;
  }
  fastProto = FastObject.prototype =
  o == null ?
  Object.create(null) :
  o;
  return new FastObject();
}

// Initialize the inline property cache of FastObject.
FastObject();

function toFastproperties(o) {
  return FastObject(o);
}exports.default =

toFastproperties;
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