49 lines
1.3 KiB
JavaScript
49 lines
1.3 KiB
JavaScript
"use strict";
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var traverse = require("../../../traverse");
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var t = require("../../../types");
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exports.check = function (node) {
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return t.isVariableDeclaration(node, { kind: "const" });
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};
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var visitor = {
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enter: function (node, parent, scope, context, state) {
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if (t.isAssignmentExpression(node) || t.isUpdateExpression(node)) {
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var ids = t.getBindingIdentifiers(node);
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for (var key in ids) {
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var id = ids[key];
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var constant = state.constants[key];
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// no constant exists
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if (!constant) continue;
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// check if the assignment id matches the constant declaration id
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// if it does then it was the id used to initially declare the
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// constant so we can just ignore it
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if (id === constant) continue;
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var localBinding = scope.getBinding(key);
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if (localBinding !== constant) continue;
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throw state.file.errorWithNode(id, key + " is read-only");
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}
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} else if (t.isScope(node)) {
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context.skip();
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}
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}
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};
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exports.Scope = function (node, parent, scope, context, file) {
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scope.traverse(node, visitor, {
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constants: scope.getAllDeclarationsOfKind("const"),
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file: file
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});
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};
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exports.VariableDeclaration = function (node) {
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if (node.kind === "const") node.kind = "let";
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};
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