Upgrade escope and use the new API in js-analyze.js.

scripts/dev-bundle-tool-package.js

@@ -50,7 +50,7 @@ var packageJson = {
     // https://github.com/jgm/CommonMark/issues/276 . If it does, remove the
     // workaround from the tool.
     "commonmark": "0.15.0",
-    escope: "1.0.1",
+    escope: "3.2.0",
     // 2.4.0 (more or less, the package.json change isn't committed) plus our PR
     // https://github.com/williamwicks/node-eachline/pull/4
     eachline: "https://github.com/meteor/node-eachline/tarball/ff89722ff94e6b6a08652bf5f44c8fffea8a21da",

tools/isobuild/js-analyze.js

@@ -1,5 +1,5 @@
 import { parse } from 'meteor-babel';
-import escope from 'escope';
+import { analyze as analyzeScope } from 'escope';
 
 // Like babel.parse, but annotates any thrown error with $ParseError = true.
 function tryToParse(source) {
@@ -43,8 +43,8 @@ export function findAssignedGlobals(source) {
   //
   // But it can't pull references outward, so for our purposes it is safe to
   // ignore.
-  const scoper = escope.analyze(ast, { ignoreEval: true });
-  const globalScope = scoper.scopes[0];
+  const scopeManager = analyzeScope(ast, { ignoreEval: true });
+  const globalScope = scopeManager.acquire(ast);
 
   const assignedGlobals = {};
   // Underscore is not available in this package.