Plugin Options" class="reference-link">Plugin Options

    These options then get passed into plugin visitors through the object:

    1. export default function({ types: t }) {
    2.   return {
    3.     visitor: {
    4.       FunctionDeclaration(path, state) {
    5.         console.log(state.opts);
    6.       }
    8.   }
    9. }

    Plugins can have functions that are run before or after plugins. They can be used for setup or cleanup/analysis purposes.

    1. export default function({ types: t }) {
    2.   return {
    3.     inherits: require("babel-plugin-syntax-jsx")
    4.   };

    If you want to throw an error with babel-code-frame and a message:

    2.    7 |
    3.    8 | let tips = [
    4. >  9 |   "Click on any AST node with a '+' to expand it",
    5.      |   ^
    6.   10 |
    7.   11 |   "Hovering over a node highlights the \
    8.   12 |    corresponding part in the source code",