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add header comment for scope cache function

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This commit is contained in:
Sebastian McKenzie 2015-11-06 20:53:12 -05:00
parent e80c206591
commit bb1703e1a1
1 changed files with 7 additions and 2 deletions
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9
packages/babel-traverse/src/scope/index.js
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@ -14,10 +14,15 @@ import * as t from "babel-types";
//
const CACHE_SINGLE_KEY = "_scope";
const CACHE_SINGLE_KEY = "_scope"; //Symbol();
const CACHE_MULTIPLE_KEY = "_scopes"; //Symbol();
// here we optimise for the case of there being only a single scope associated with a node
/**
* To avoid creating a new Scope instance for each traversal, we maintain a cache on the
* node itself containing all scopes it has been associated with.
*
* We also optimise for the case of there being only a single scope associated with a node.
*/
function getCache(node, parentScope, self) {
let singleCache = node[CACHE_SINGLE_KEY];