packages/babel-plugin-proposal-decorators/src/index.js
/* eslint-disable @babel/development/plugin-name */
import { declare } from "@babel/helper-plugin-utils";
import syntaxDecorators from "@babel/plugin-syntax-decorators";
import {
createClassFeaturePlugin,
FEATURES,
} from "@babel/helper-create-class-features-plugin";
import legacyVisitor from "./transformer-legacy";
export default declare((api, options) => {
api.assertVersion(7);
const { legacy = false } = options;
if (typeof legacy !== "boolean") {
throw new Error("'legacy' must be a boolean.");
}
const { decoratorsBeforeExport } = options;
if (decoratorsBeforeExport === undefined) {
if (!legacy) {
throw new Error(
"The decorators plugin requires a 'decoratorsBeforeExport' option," +
" whose value must be a boolean. If you want to use the legacy" +
" decorators semantics, you can set the 'legacy: true' option.",
);
}
} else {
if (legacy) {
throw new Error(
"'decoratorsBeforeExport' can't be used with legacy decorators.",
);
}
if (typeof decoratorsBeforeExport !== "boolean") {
throw new Error("'decoratorsBeforeExport' must be a boolean.");
}
}
if (legacy) {
return {
name: "proposal-decorators",
inherits: syntaxDecorators,
manipulateOptions({ generatorOpts }) {
generatorOpts.decoratorsBeforeExport = decoratorsBeforeExport;
},
visitor: legacyVisitor,
};
}
return createClassFeaturePlugin({
name: "proposal-decorators",
feature: FEATURES.decorators,
// loose: options.loose, Not supported
manipulateOptions({ generatorOpts, parserOpts }) {
parserOpts.plugins.push(["decorators", { decoratorsBeforeExport }]);
generatorOpts.decoratorsBeforeExport = decoratorsBeforeExport;
},
});
});