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index.js
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import { declare } from "@babel/helper-plugin-utils";
import syntaxDynamicImport from "@babel/plugin-syntax-dynamic-import";
import { version } from "../package.json";
const SUPPORTED_MODULES = ["commonjs", "amd", "systemjs"];
const MODULES_NOT_FOUND = `\
@babel/plugin-proposal-dynamic-import depends on a modules
transform plugin. Supported plugins are:
- @babel/plugin-transform-modules-commonjs ^7.4.0
- @babel/plugin-transform-modules-amd ^7.4.0
- @babel/plugin-transform-modules-systemjs ^7.4.0
If you are using Webpack or Rollup and thus don't want
Babel to transpile your imports and exports, you can use
the @babel/plugin-syntax-dynamic-import plugin and let your
bundler handle dynamic imports.
`;
export default declare(api => {
api.assertVersion(7);
return {
name: "proposal-dynamic-import",
inherits: syntaxDynamicImport,
pre() {
this.file.set("@babel/plugin-proposal-dynamic-import", version);
},
visitor: {
Program() {
const modules = this.file.get("@babel/plugin-transform-modules-*");
if (!SUPPORTED_MODULES.includes(modules)) {
throw new Error(MODULES_NOT_FOUND);
}
},
},
};
});