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---
id: babel-plugin-transform-instanceof
title: @babel/plugin-transform-instanceof
sidebar_label: transform-instanceof
---
In
foo instanceof Bar;
Out
function _instanceof(left, right) {
if (right != null && typeof Symbol !== "undefined" && right[Symbol.hasInstance]) {
return right[Symbol.hasInstance](left);
} else {
return left instanceof right;
}
}
_instanceof(foo, Bar);
npm install --save-dev @babel/plugin-transform-instanceof
.babelrc
{
"plugins": ["@babel/plugin-transform-instanceof"]
}
babel --plugins @babel/plugin-transform-instanceof script.js
require("@babel/core").transform("code", {
plugins: ["@babel/plugin-transform-instanceof"]
});