@babel/plugin-syntax-import-attributes

信息

This plugin is included in @babel/preset-env, in ES2025

备注

Syntax only

This plugin only enables Babel to parse and generate this syntax. Babel does not support transforming this syntax.

While Babel supports parsing import attributes by default since v7.25.0, this plugin is still needed to let Babel choose the correct syntax when emitting code. As an alternative to this plugin, you can use @babel/generator's importAttributesKeyword option:

{
  "generatorOpts": {
    "importAttributesKeyword": "with"
  },
}

:::

This plugin enables Babel to parse import attributes:

JavaScript

import foo from "./foo.json" with { type: "json" };

Installation

npm

npm install --save-dev @babel/plugin-syntax-import-attributes

Yarn

yarn add --dev @babel/plugin-syntax-import-attributes

pnpm

pnpm add --save-dev @babel/plugin-syntax-import-attributes

Usage

With a configuration file (Recommended)

babel.config.json

{
  "plugins": ["@babel/plugin-syntax-import-attributes"]
}

Via CLI

Shell

babel --plugins @babel/plugin-syntax-import-attributes script.js

Via Node API

JavaScript

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

Options

deprecatedAssertSyntax

boolean, defaults to false.

If enabled, support parsing import attributes using the deprecated assert keyword:

JavaScript

import foo from "./foo.json" assert { type: "json" };

This syntax is only supported in V8-based engines, and its removal from the web is being investigated.