PoC loading of specific parts of core-js

js/bundle.go

@@ -280,7 +280,7 @@ func (b *Bundle) instantiate(logger logrus.FieldLogger, rt *goja.Runtime, init *
 	rt.SetRandSource(common.NewRandSource())
 
 	if init.compatibilityMode == lib.CompatibilityModeExtended {
-		if _, err := rt.RunProgram(jslib.GetCoreJS()); err != nil {
+		if err := jslib.AddPolyfills(rt); err != nil {
 			return err
 		}
 	}

js/lib/core-js/_a-function.js

@@ -0,0 +1,4 @@
+module.exports = function (it) {
+  if (typeof it != 'function') throw TypeError(it + ' is not a function!');
+  return it;
+};

js/lib/core-js/_add-to-unscopables.js

@@ -0,0 +1,7 @@
+// 22.1.3.31 Array.prototype[@@unscopables]
+var UNSCOPABLES = require('./_wks')('unscopables');
+var ArrayProto = Array.prototype;
+if (ArrayProto[UNSCOPABLES] == undefined) require('./_hide')(ArrayProto, UNSCOPABLES, {});
+module.exports = function (key) {
+  ArrayProto[UNSCOPABLES][key] = true;
+};

js/lib/core-js/_an-instance.js

@@ -0,0 +1,5 @@
+module.exports = function (it, Constructor, name, forbiddenField) {
+  if (!(it instanceof Constructor) || (forbiddenField !== undefined && forbiddenField in it)) {
+    throw TypeError(name + ': incorrect invocation!');
+  } return it;
+};

js/lib/core-js/_an-object.js

@@ -0,0 +1,5 @@
+var isObject = require('./_is-object');
+module.exports = function (it) {
+  if (!isObject(it)) throw TypeError(it + ' is not an object!');
+  return it;
+};

js/lib/core-js/_array-from-iterable.js

@@ -0,0 +1,7 @@
+var forOf = require('./_for-of');
+
+module.exports = function (iter, ITERATOR) {
+  var result = [];
+  forOf(iter, false, result.push, result, ITERATOR);
+  return result;
+};

js/lib/core-js/_array-includes.js

@@ -0,0 +1,23 @@
+// false -> Array#indexOf
+// true  -> Array#includes
+var toIObject = require('./_to-iobject');
+var toLength = require('./_to-length');
+var toAbsoluteIndex = require('./_to-absolute-index');
+module.exports = function (IS_INCLUDES) {
+  return function ($this, el, fromIndex) {
+    var O = toIObject($this);
+    var length = toLength(O.length);
+    var index = toAbsoluteIndex(fromIndex, length);
+    var value;
+    // Array#includes uses SameValueZero equality algorithm
+    // eslint-disable-next-line no-self-compare
+    if (IS_INCLUDES && el != el) while (length > index) {
+      value = O[index++];
+      // eslint-disable-next-line no-self-compare
+      if (value != value) return true;
+    // Array#indexOf ignores holes, Array#includes - not
+    } else for (;length > index; index++) if (IS_INCLUDES || index in O) {
+      if (O[index] === el) return IS_INCLUDES || index || 0;
+    } return !IS_INCLUDES && -1;
+  };
+};

js/lib/core-js/_array-methods.js

@@ -0,0 +1,44 @@
+// 0 -> Array#forEach
+// 1 -> Array#map
+// 2 -> Array#filter
+// 3 -> Array#some
+// 4 -> Array#every
+// 5 -> Array#find
+// 6 -> Array#findIndex
+var ctx = require('./_ctx');
+var IObject = require('./_iobject');
+var toObject = require('./_to-object');
+var toLength = require('./_to-length');
+var asc = require('./_array-species-create');
+module.exports = function (TYPE, $create) {
+  var IS_MAP = TYPE == 1;
+  var IS_FILTER = TYPE == 2;
+  var IS_SOME = TYPE == 3;
+  var IS_EVERY = TYPE == 4;
+  var IS_FIND_INDEX = TYPE == 6;
+  var NO_HOLES = TYPE == 5 || IS_FIND_INDEX;
+  var create = $create || asc;
+  return function ($this, callbackfn, that) {
+    var O = toObject($this);
+    var self = IObject(O);
+    var f = ctx(callbackfn, that, 3);
+    var length = toLength(self.length);
+    var index = 0;
+    var result = IS_MAP ? create($this, length) : IS_FILTER ? create($this, 0) : undefined;
+    var val, res;
+    for (;length > index; index++) if (NO_HOLES || index in self) {
+      val = self[index];
+      res = f(val, index, O);
+      if (TYPE) {
+        if (IS_MAP) result[index] = res;   // map
+        else if (res) switch (TYPE) {
+          case 3: return true;             // some
+          case 5: return val;              // find
+          case 6: return index;            // findIndex
+          case 2: result.push(val);        // filter
+        } else if (IS_EVERY) return false; // every
+      }
+    }
+    return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : result;
+  };
+};

js/lib/core-js/_array-species-constructor.js

@@ -0,0 +1,16 @@
+var isObject = require('./_is-object');
+var isArray = require('./_is-array');
+var SPECIES = require('./_wks')('species');
+
+module.exports = function (original) {
+  var C;
+  if (isArray(original)) {
+    C = original.constructor;
+    // cross-realm fallback
+    if (typeof C == 'function' && (C === Array || isArray(C.prototype))) C = undefined;
+    if (isObject(C)) {
+      C = C[SPECIES];
+      if (C === null) C = undefined;
+    }
+  } return C === undefined ? Array : C;
+};

js/lib/core-js/_array-species-create.js

@@ -0,0 +1,6 @@
+// 9.4.2.3 ArraySpeciesCreate(originalArray, length)
+var speciesConstructor = require('./_array-species-constructor');
+
+module.exports = function (original, length) {
+  return new (speciesConstructor(original))(length);
+};

js/lib/core-js/_classof.js

@@ -0,0 +1,23 @@
+// getting tag from 19.1.3.6 Object.prototype.toString()
+var cof = require('./_cof');
+var TAG = require('./_wks')('toStringTag');
+// ES3 wrong here
+var ARG = cof(function () { return arguments; }()) == 'Arguments';
+
+// fallback for IE11 Script Access Denied error
+var tryGet = function (it, key) {
+  try {
+    return it[key];
+  } catch (e) { /* empty */ }
+};
+
+module.exports = function (it) {
+  var O, T, B;
+  return it === undefined ? 'Undefined' : it === null ? 'Null'
+    // @@toStringTag case
+    : typeof (T = tryGet(O = Object(it), TAG)) == 'string' ? T
+    // builtinTag case
+    : ARG ? cof(O)
+    // ES3 arguments fallback
+    : (B = cof(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : B;
+};

js/lib/core-js/_cof.js

@@ -0,0 +1,5 @@
+var toString = {}.toString;
+
+module.exports = function (it) {
+  return toString.call(it).slice(8, -1);
+};

js/lib/core-js/_collection-strong.js

@@ -0,0 +1,144 @@
+'use strict';
+var dP = require('./_object-dp').f;
+var create = require('./_object-create');
+var redefineAll = require('./_redefine-all');
+var ctx = require('./_ctx');
+var anInstance = require('./_an-instance');
+var forOf = require('./_for-of');
+var $iterDefine = require('./_iter-define');
+var step = require('./_iter-step');
+var setSpecies = require('./_set-species');
+var DESCRIPTORS = require('./_descriptors');
+var fastKey = require('./_meta').fastKey;
+var validate = require('./_validate-collection');
+var SIZE = DESCRIPTORS ? '_s' : 'size';
+
+var getEntry = function (that, key) {
+  // fast case
+  var index = fastKey(key);
+  var entry;
+  if (index !== 'F') return that._i[index];
+  // frozen object case
+  for (entry = that._f; entry; entry = entry.n) {
+    if (entry.k == key) return entry;
+  }
+};
+
+module.exports = {
+  getConstructor: function (wrapper, NAME, IS_MAP, ADDER) {
+    var C = wrapper(function (that, iterable) {
+      anInstance(that, C, NAME, '_i');
+      that._t = NAME;         // collection type
+      that._i = create(null); // index
+      that._f = undefined;    // first entry
+      that._l = undefined;    // last entry
+      that[SIZE] = 0;         // size
+      if (iterable != undefined) forOf(iterable, IS_MAP, that[ADDER], that);
+    });
+    redefineAll(C.prototype, {
+      // 23.1.3.1 Map.prototype.clear()
+      // 23.2.3.2 Set.prototype.clear()
+      clear: function clear() {
+        for (var that = validate(this, NAME), data = that._i, entry = that._f; entry; entry = entry.n) {
+          entry.r = true;
+          if (entry.p) entry.p = entry.p.n = undefined;
+          delete data[entry.i];
+        }
+        that._f = that._l = undefined;
+        that[SIZE] = 0;
+      },
+      // 23.1.3.3 Map.prototype.delete(key)
+      // 23.2.3.4 Set.prototype.delete(value)
+      'delete': function (key) {
+        var that = validate(this, NAME);
+        var entry = getEntry(that, key);
+        if (entry) {
+          var next = entry.n;
+          var prev = entry.p;
+          delete that._i[entry.i];
+          entry.r = true;
+          if (prev) prev.n = next;
+          if (next) next.p = prev;
+          if (that._f == entry) that._f = next;
+          if (that._l == entry) that._l = prev;
+          that[SIZE]--;
+        } return !!entry;
+      },
+      // 23.2.3.6 Set.prototype.forEach(callbackfn, thisArg = undefined)
+      // 23.1.3.5 Map.prototype.forEach(callbackfn, thisArg = undefined)
+      forEach: function forEach(callbackfn /* , that = undefined */) {
+        validate(this, NAME);
+        var f = ctx(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3);
+        var entry;
+        while (entry = entry ? entry.n : this._f) {
+          f(entry.v, entry.k, this);
+          // revert to the last existing entry
+          while (entry && entry.r) entry = entry.p;
+        }
+      },
+      // 23.1.3.7 Map.prototype.has(key)
+      // 23.2.3.7 Set.prototype.has(value)
+      has: function has(key) {
+        return !!getEntry(validate(this, NAME), key);
+      }
+    });
+    if (DESCRIPTORS) dP(C.prototype, 'size', {
+      get: function () {
+        return validate(this, NAME)[SIZE];
+      }
+    });
+    return C;
+  },
+  def: function (that, key, value) {
+    var entry = getEntry(that, key);
+    var prev, index;
+    // change existing entry
+    if (entry) {
+      entry.v = value;
+    // create new entry
+    } else {
+      that._l = entry = {
+        i: index = fastKey(key, true), // <- index
+        k: key,                        // <- key
+        v: value,                      // <- value
+        p: prev = that._l,             // <- previous entry
+        n: undefined,                  // <- next entry
+        r: false                       // <- removed
+      };
+      if (!that._f) that._f = entry;
+      if (prev) prev.n = entry;
+      that[SIZE]++;
+      // add to index
+      if (index !== 'F') that._i[index] = entry;
+    } return that;
+  },
+  getEntry: getEntry,
+  setStrong: function (C, NAME, IS_MAP) {
+    // add .keys, .values, .entries, [@@iterator]
+    // 23.1.3.4, 23.1.3.8, 23.1.3.11, 23.1.3.12, 23.2.3.5, 23.2.3.8, 23.2.3.10, 23.2.3.11
+    $iterDefine(C, NAME, function (iterated, kind) {
+      this._t = validate(iterated, NAME); // target
+      this._k = kind;                     // kind
+      this._l = undefined;                // previous
+    }, function () {
+      var that = this;
+      var kind = that._k;
+      var entry = that._l;
+      // revert to the last existing entry
+      while (entry && entry.r) entry = entry.p;
+      // get next entry
+      if (!that._t || !(that._l = entry = entry ? entry.n : that._t._f)) {
+        // or finish the iteration
+        that._t = undefined;
+        return step(1);
+      }
+      // return step by kind
+      if (kind == 'keys') return step(0, entry.k);
+      if (kind == 'values') return step(0, entry.v);
+      return step(0, [entry.k, entry.v]);
+    }, IS_MAP ? 'entries' : 'values', !IS_MAP, true);
+
+    // add [@@species], 23.1.2.2, 23.2.2.2
+    setSpecies(NAME);
+  }
+};

js/lib/core-js/_collection-to-json.js

@@ -0,0 +1,9 @@
+// https://github.com/DavidBruant/Map-Set.prototype.toJSON
+var classof = require('./_classof');
+var from = require('./_array-from-iterable');
+module.exports = function (NAME) {
+  return function toJSON() {
+    if (classof(this) != NAME) throw TypeError(NAME + "#toJSON isn't generic");
+    return from(this);
+  };
+};