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@babel/plugin-transform-proto-to-assign

Detail​

This means that the following will work:

JavaScript
var foo = { a: 1 };
var bar = { b: 2 };
bar.__proto__ = foo;
bar.a; // 1
bar.b; // 2

however the following will not:

JavaScript
var foo = { a: 1 };
var bar = { b: 2 };
bar.__proto__ = foo;
bar.a; // 1
foo.a = 2;
bar.a; // 1 - should be 2 but remember that nothing is bound and it's a straight copy

This is a case that you have to be aware of if you intend to use this plugin.

Example​

In

JavaScript
bar.__proto__ = foo;

Out

JavaScript
function _defaults(obj, defaults) { ... }

_defaults(bar, foo);

Installation​

npm install --save-dev @babel/plugin-transform-proto-to-assign

Usage​

babel.config.json
{
  "plugins": ["@babel/plugin-transform-proto-to-assign"]
}

Via CLI​

Shell
babel --plugins @babel/plugin-transform-proto-to-assign script.js

Via Node API​

JavaScript
require("@babel/core").transformSync("code", {
  plugins: ["@babel/plugin-transform-proto-to-assign"],
});

References​