51 lines
1.3 KiB
JavaScript
51 lines
1.3 KiB
JavaScript
var traverse = require("../../traverse");
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var t = require("../../types");
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var _ = require("lodash");
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exports.Program =
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exports.BlockStatement =
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exports.ForInStatement =
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exports.ForOfStatement =
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exports.ForStatement = function (node, parent, file) {
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var constants = {};
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var check = function (node, names, parent) {
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_.each(names, function (name) {
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if (!_.has(constants, name)) return;
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if (parent && t.isBlockStatement(parent) && parent !== constants[name]) return;
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throw file.errorWithNode(node, name + " is read-only");
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});
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};
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var getIds = function (node) {
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return t.getIds(node, false, ["MemberExpression"]);
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};
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_.each(node.body, function (child, parent) {
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if (child && t.isVariableDeclaration(child, { kind: "const" })) {
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_.each(child.declarations, function (declar) {
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_.each(getIds(declar), function (name) {
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check(declar, [name], parent);
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constants[name] = parent;
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});
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declar._ignoreConstant = true;
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});
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child._ignoreConstant = true;
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child.kind = "let";
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}
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});
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if (_.isEmpty(constants)) return;
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traverse(node, function (child, parent) {
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if (child._ignoreConstant) return;
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if (t.isDeclaration(child) || t.isAssignmentExpression(child)) {
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check(child, getIds(child), parent);
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}
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});
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};
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