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@babel/plugin-transform-instanceof · Babel

Example​

In

Out

JavaScript

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);

Installation​

  • npm
  • Yarn
  • pnpm
  • Bun
npm install --save-dev @babel/plugin-transform-instanceof

Usage​

babel.config.json

{
  "plugins": ["@babel/plugin-transform-instanceof"]
}

Via CLI​

Shell

babel --plugins @babel/plugin-transform-instanceof script.js

Via Node API​

JavaScript

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

References​