packages/babel-plugin-proposal-throw-expressions/src/index.js
import { declare } from "@babel/helper-plugin-utils";
import syntaxThrowExpressions from "@babel/plugin-syntax-throw-expressions";
import { types as t } from "@babel/core";
export default declare(api => {
api.assertVersion(7);
return {
name: "proposal-throw-expressions",
inherits: syntaxThrowExpressions,
visitor: {
UnaryExpression(path) {
const { operator, argument } = path.node;
if (operator !== "throw") return;
const arrow = t.functionExpression(
null,
[t.identifier("e")],
t.blockStatement([t.throwStatement(t.identifier("e"))]),
);
path.replaceWith(t.callExpression(arrow, [argument]));
},
},
};
});