diff options
author | isaacs <i@izs.me> | 2020-07-23 20:58:04 +0300 |
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committer | isaacs <i@izs.me> | 2020-07-29 21:53:42 +0300 |
commit | ad5e07d8bd86d1dbe2b03dc142f8c8d6f4828ffe (patch) | |
tree | 97b66f97d77f35774f10a5e3e9957b1897d150bb /node_modules/es-abstract/2019/IsConstructor.js | |
parent | a16994cfdd2f255016f3d8ee60d03473d80eabd8 (diff) |
Full dependency reboot
Reinstall everything from a clean node_modules and package-lock.json
state.
Re-generate list of bundleDependencies and node_modules/.gitignore with
a script that does the right thing based on actual dependency state.
Diffstat (limited to 'node_modules/es-abstract/2019/IsConstructor.js')
-rw-r--r-- | node_modules/es-abstract/2019/IsConstructor.js | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/node_modules/es-abstract/2019/IsConstructor.js b/node_modules/es-abstract/2019/IsConstructor.js new file mode 100644 index 000000000..8ba9fe55b --- /dev/null +++ b/node_modules/es-abstract/2019/IsConstructor.js @@ -0,0 +1,40 @@ +'use strict'; + +var GetIntrinsic = require('../GetIntrinsic.js'); + +var $construct = GetIntrinsic('%Reflect.construct%', true); + +var DefinePropertyOrThrow = require('./DefinePropertyOrThrow'); +try { + DefinePropertyOrThrow({}, '', { '[[Get]]': function () {} }); +} catch (e) { + // Accessor properties aren't supported + DefinePropertyOrThrow = null; +} + +// https://www.ecma-international.org/ecma-262/6.0/#sec-isconstructor + +if (DefinePropertyOrThrow && $construct) { + var isConstructorMarker = {}; + var badArrayLike = {}; + DefinePropertyOrThrow(badArrayLike, 'length', { + '[[Get]]': function () { + throw isConstructorMarker; + }, + '[[Enumerable]]': true + }); + + module.exports = function IsConstructor(argument) { + try { + // `Reflect.construct` invokes `IsConstructor(target)` before `Get(args, 'length')`: + $construct(argument, badArrayLike); + } catch (err) { + return err === isConstructorMarker; + } + }; +} else { + module.exports = function IsConstructor(argument) { + // unfortunately there's no way to truly check this without try/catch `new argument` in old environments + return typeof argument === 'function' && !!argument.prototype; + }; +} |