flow like the river

VISUALIZACION/node_modules/parcel-bundler/lib/visitors/matches-pattern.js

@@ -0,0 +1,38 @@
+'use strict';
+
+const types = require('babel-types');
+
+// from babel-types. remove when we upgrade to babel 7.
+// https://github.com/babel/babel/blob/0189b387026c35472dccf45d14d58312d249f799/packages/babel-types/src/index.js#L347
+module.exports = function matchesPattern(member, match, allowPartial) {
+  // not a member expression
+  if (!types.isMemberExpression(member)) return false;
+
+  const parts = Array.isArray(match) ? match : match.split('.');
+  const nodes = [];
+
+  let node;
+  for (node = member; types.isMemberExpression(node); node = node.object) {
+    nodes.push(node.property);
+  }
+  nodes.push(node);
+
+  if (nodes.length < parts.length) return false;
+  if (!allowPartial && nodes.length > parts.length) return false;
+
+  for (let i = 0, j = nodes.length - 1; i < parts.length; i++, j--) {
+    const node = nodes[j];
+    let value;
+    if (types.isIdentifier(node)) {
+      value = node.name;
+    } else if (types.isStringLiteral(node)) {
+      value = node.value;
+    } else {
+      return false;
+    }
+
+    if (parts[i] !== value) return false;
+  }
+
+  return true;
+};