Merging exports and imports

Import

import { doStuff } from "export";

doStuff();

Export

export default function doStuff() {}

Graph

.png .pdf .dot

Notes

• It's easy to see that there are 2 separate AST+Scope graphs with only one connection.
• Both of these graphs would contain one BindingIdentifier node with a name of doStuff.
• If these are not merged export-time (and they should not be), I only need to merge these nodes based on various rules. See:
  • https://hacks.mozilla.org/2015/08/es6-in-depth-modules/
  • https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import
  • https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/export
• For some reason these two nodes are already merged together. I've used the same GraphIterator instance, so if these two were the same Objects in Java, they are represented by the same node in the graph. With the static parsing function in Shift this should not happen.

Transformation

1. Find the imported IdentifierExporession in the GlobalScope node's items list.
2. Find the connected upstream Variable node.
3. Find the Declaration for the Export that has a Node with the same BindingIdentifier as the import.
4. Connect the Variable on the import side to the Declaration on the export side with a declarations relationship.

MATCH
	(:ImportDeclaration)-[*]->(importIdentifier:BindingIdentifier)
MATCH
	(:GlobalScope)-[:through]->(:HashTable)-[]->(reference:Reference)
	-[:node]->(:Either)-[:data]->(identifier:IdentifierExpression)
MATCH
	(:ExportDeclaration)-[:declaration]->(:Node)-[:name]
	->(exportIdentifier:BindingIdentifier)

MATCH
	(exportIdentifier)<-[:node]-(declaration:Declaration)
MATCH
	(reference)<-[:references]-(variable:Variable)

WHERE
	importIdentifier.name = identifier.name AND 
	exportIdentifier.name = importIdentifier.name

CREATE UNIQUE
	(variable)-[:declarations]->(declaration)

RETURN
	importIdentifier, exportIdentifier, variable, declaration