Invoke visitors in Program exit

[tbranyen]

This is a request to move the path traversal for CallExpression/Import/Export/etc. to the Program exit. I have a sample repo to load a React application in ESM and use this module to apply the import path resolution.

The problem is that my CJS->ESM plugin must run first, and then this plugin. Since Babel doesn't have a way to properly schedule tasks, the fix here would be to run later.

module.exports = ({types: t}) => ({
	inherits: syntax.default,
	visitor: {
		Program: {
			exit(path, { opts }) {
				path.traverse({
					CallExpression(path) {

I can open a PR to show the change as well.

[tbranyen]

Issued PR #27

[tbranyen]

Link to repository if you're interested: https://github.com/tbranyen/react-babel-esm