@babel/plugin-transform-duplicate-keys
info
This plugin is included in @babel/preset-env
This plugin actually converts duplicate keys in objects to be computed properties, which then must be handled by the @babel/plugin-transform-computed-properties plugin. The final result won't contain any object literals with duplicate keys.
Example
In
JavaScript
var x = { a: 5, a: 6 };
var y = {
get a() {},
set a(x) {},
a: 3,
};
Out
JavaScript
var x = { a: 5, ["a"]: 6 };
var y = {
get a() {},
set a(x) {},
["a"]: 3,
};
Installation
- npm
- Yarn
- pnpm
npm install --save-dev @babel/plugin-transform-duplicate-keys
yarn add --dev @babel/plugin-transform-duplicate-keys
pnpm add --save-dev @babel/plugin-transform-duplicate-keys
Usage
With a configuration file (Recommended)
babel.config.json
{
"plugins": ["@babel/plugin-transform-duplicate-keys"]
}
Via CLI
Shell
babel --plugins @babel/plugin-transform-duplicate-keys script.js
Via Node API
JavaScript
require("@babel/core").transformSync("code", {
plugins: ["@babel/plugin-transform-duplicate-keys"],
});