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Fix _isNativeReflectConstruct helper #8461

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merged 2 commits into from Feb 22, 2021
Merged

Fix _isNativeReflectConstruct helper #8461

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72fa863
Fix _isNaiveReflectConstruct helper
nicolo-ribaudo Aug 13, 2018
cc85d4e
Justin's review
nicolo-ribaudo Feb 22, 2021
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18 changes: 12 additions & 6 deletions packages/babel-helpers/src/helpers.js
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Expand Up @@ -506,10 +506,12 @@ helpers.setPrototypeOf = helper("7.0.0-beta.0")`

helpers.isNativeReflectConstruct = helper("7.9.0")`
export default function _isNativeReflectConstruct() {
if (typeof Reflect === "undefined" || !Reflect.construct) return false;

// core-js@3
if (Reflect.construct.sham) return false;
if (
typeof Reflect === "undefined" ||
!Reflect.construct ||
// core-js@3
Reflect.construct.sham
) return false;
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Weak Nit: I actually liked the previous style better.

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Me too, but I noticed that merging them minifies better (terser doesn't merge the two if statements).

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It should, I made the PR myself 😉 : terser/terser#555

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Not with this code 🤔

// write or paste code here

export function f() {
  if (!a) return false;
  if (!b) return false;
  try {
    foo();
    return true;
  } catch {
    return false;
  }
}

(tested at https://try.terser.org/)

Anyway, I'm happy to revert this change since it will be eventually handled by terser.

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Ahh, it's because it can't collapse the try-catch statement into an expression, so the if-statements exist only as a series of if-statements and not a nested ternary. Open an issue?


// Proxy can't be polyfilled. Every browser implemented
// proxies before or at the same time as Reflect.construct,
Expand All @@ -523,8 +525,12 @@ helpers.isNativeReflectConstruct = helper("7.9.0")`
try {
// If the internal slots aren't set, this throws an error similar to
// TypeError: this is not a Date object.
Date.prototype.toString.call(Reflect.construct(Date, [], function() {}));
return true;
// Date#toString is generic in ES2015 [1] and it doesn't throw, but it
// returns "Invalid Date" if the receiver is not a properly initialized
// Date object.
// [1]: https://github.com/tc39/ecma262/issues/1268#issuecomment-410104832

return Date.prototype.toString.call(Reflect.construct(Date, [], function() {})) !== "Invalid Date";
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We could also change this to Boolean.prototype.valueOf:

} catch (e) {
return false;
}
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2 changes: 1 addition & 1 deletion packages/babel-plugin-proposal-class-properties/test/fixtures/public/foobar/output.js
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@@ -1,6 +1,6 @@
function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = babelHelpers.getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = babelHelpers.getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return babelHelpers.possibleConstructorReturn(this, result); }; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

var Child = /*#__PURE__*/function (_Parent) {
"use strict";
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2 changes: 1 addition & 1 deletion packages/babel-plugin-proposal-class-properties/test/fixtures/regression/6154/output.js
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Expand Up @@ -10,7 +10,7 @@ function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) ===

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _get(target, property, receiver) { if (typeof Reflect !== "undefined" && Reflect.get) { _get = Reflect.get; } else { _get = function _get(target, property, receiver) { var base = _superPropBase(target, property); if (!base) return; var desc = Object.getOwnPropertyDescriptor(base, property); if (desc.get) { return desc.get.call(receiver); } return desc.value; }; } return _get(target, property, receiver || target); }

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2 changes: 1 addition & 1 deletion packages/babel-plugin-proposal-decorators/test/fixtures/legacy-regression/7030/output.js
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Expand Up @@ -12,7 +12,7 @@ function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) ===

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

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2 changes: 1 addition & 1 deletion packages/babel-plugin-transform-classes/test/fixtures/extend-builtins/loose/output.js
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Expand Up @@ -4,7 +4,7 @@ function _wrapNativeSuper(Class) { var _cache = typeof Map === "function" ? new

function _construct(Parent, args, Class) { if (_isNativeReflectConstruct()) { _construct = Reflect.construct; } else { _construct = function _construct(Parent, args, Class) { var a = [null]; a.push.apply(a, args); var Constructor = Function.bind.apply(Parent, a); var instance = new Constructor(); if (Class) _setPrototypeOf(instance, Class.prototype); return instance; }; } return _construct.apply(null, arguments); }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _isNativeFunction(fn) { return Function.toString.call(fn).indexOf("[native code]") !== -1; }

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2 changes: 1 addition & 1 deletion packages/babel-plugin-transform-classes/test/fixtures/extend-builtins/shadowed/output.js
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@@ -1,6 +1,6 @@
function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = babelHelpers.getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = babelHelpers.getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return babelHelpers.possibleConstructorReturn(this, result); }; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

let Array = function Array() {
"use strict";
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2 changes: 1 addition & 1 deletion packages/babel-plugin-transform-classes/test/fixtures/extend-builtins/spec/output.js
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Expand Up @@ -12,7 +12,7 @@ function _wrapNativeSuper(Class) { var _cache = typeof Map === "function" ? new

function _construct(Parent, args, Class) { if (_isNativeReflectConstruct()) { _construct = Reflect.construct; } else { _construct = function _construct(Parent, args, Class) { var a = [null]; a.push.apply(a, args); var Constructor = Function.bind.apply(Parent, a); var instance = new Constructor(); if (Class) _setPrototypeOf(instance, Class.prototype); return instance; }; } return _construct.apply(null, arguments); }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _isNativeFunction(fn) { return Function.toString.call(fn).indexOf("[native code]") !== -1; }

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2 changes: 1 addition & 1 deletion ...n-transform-classes/test/fixtures/get-set/call-semantics-data-defined-on-parent/output.js
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Expand Up @@ -14,7 +14,7 @@ function _possibleConstructorReturn(self, call) { if (call && (typeof call === "

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

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2 changes: 1 addition & 1 deletion ...transform-classes/test/fixtures/get-set/call-semantics-getter-defined-on-parent/output.js
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Expand Up @@ -14,7 +14,7 @@ function _possibleConstructorReturn(self, call) { if (call && (typeof call === "

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

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2 changes: 1 addition & 1 deletion ...in-transform-classes/test/fixtures/get-set/call-semantics-not-defined-on-parent/output.js
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Expand Up @@ -18,7 +18,7 @@ function _possibleConstructorReturn(self, call) { if (call && (typeof call === "

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

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2 changes: 1 addition & 1 deletion ...transform-classes/test/fixtures/get-set/call-semantics-setter-defined-on-parent/output.js
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Expand Up @@ -14,7 +14,7 @@ function _possibleConstructorReturn(self, call) { if (call && (typeof call === "

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

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2 changes: 1 addition & 1 deletion ...in-transform-classes/test/fixtures/get-set/get-semantics-data-defined-on-parent/output.js
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Expand Up @@ -18,7 +18,7 @@ function _possibleConstructorReturn(self, call) { if (call && (typeof call === "

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

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2 changes: 1 addition & 1 deletion ...-transform-classes/test/fixtures/get-set/get-semantics-getter-defined-on-parent/output.js
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Expand Up @@ -14,7 +14,7 @@ function _possibleConstructorReturn(self, call) { if (call && (typeof call === "

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

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2 changes: 1 addition & 1 deletion ...gin-transform-classes/test/fixtures/get-set/get-semantics-not-defined-on-parent/output.js
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Expand Up @@ -18,7 +18,7 @@ function _possibleConstructorReturn(self, call) { if (call && (typeof call === "

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

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2 changes: 1 addition & 1 deletion ...-transform-classes/test/fixtures/get-set/get-semantics-setter-defined-on-parent/output.js
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Expand Up @@ -14,7 +14,7 @@ function _possibleConstructorReturn(self, call) { if (call && (typeof call === "

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

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2 changes: 1 addition & 1 deletion packages/babel-plugin-transform-classes/test/fixtures/get-set/memoized-assign/output.js
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Expand Up @@ -24,7 +24,7 @@ function _possibleConstructorReturn(self, call) { if (call && (typeof call === "

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

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2 changes: 1 addition & 1 deletion packages/babel-plugin-transform-classes/test/fixtures/get-set/memoized-update/output.js
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Expand Up @@ -24,7 +24,7 @@ function _possibleConstructorReturn(self, call) { if (call && (typeof call === "

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct || Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { return Date.prototype.toString.call(Reflect.construct(Date, [], function () {})) !== "Invalid Date"; } catch (e) { return false; } }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

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