55 lines
1.8 KiB
JavaScript
55 lines
1.8 KiB
JavaScript
"use strict";
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// this fixes a bug where converting let to var
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// doesn't change the binding's scope to function scope
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// https://github.com/babel/babel/issues/4818
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module.exports = function (mangler) {
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mangler.program.traverse({
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VariableDeclaration(path) {
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if (path.node.kind !== "var") {
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return;
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}
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var fnScope = path.scope.getFunctionParent() || path.scope.getProgramParent();
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var bindingIds = path.getOuterBindingIdentifierPaths();
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for (var name in bindingIds) {
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var binding = path.scope.getBinding(name);
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// var isn't hoisted to fnScope
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if (binding.scope !== fnScope) {
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var existingBinding = fnScope.bindings[name];
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// make sure we are clear that the fnScope doesn't already have
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// an existing binding
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if (!existingBinding) {
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// move binding to the function scope
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// update our scopeTracker first before
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// we mutate the scope
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mangler.scopeTracker.moveBinding(binding, fnScope);
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fnScope.bindings[name] = binding;
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binding.scope = fnScope;
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delete binding.scope.bindings[name];
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} else {
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// we need a new binding that's valid in both the scopes
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// binding.scope and fnScope
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var newName = fnScope.generateUid(binding.scope.generateUid(name));
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// rename binding in the original scope
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mangler.rename(binding.scope, binding, name, newName);
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// move binding to fnScope as newName
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// update our scopeTracker first before
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// we mutate the scope
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mangler.scopeTracker.moveBinding(binding, fnScope);
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fnScope.bindings[newName] = binding;
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binding.scope = fnScope;
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delete binding.scope.bindings[newName];
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}
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}
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}
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}
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});
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}; |