44 lines
1.1 KiB
JavaScript
44 lines
1.1 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, name) {
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if (constants.indexOf(name) >= 0) {
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throw file.errorWithNode(node, name + " is read-only");
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}
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};
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_.each(node.body, function (child) {
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if (child && t.isVariableDeclaration(child) && child.kind === "const") {
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_.each(child.declarations, function (declar) {
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_.each(t.getIds(declar.id), function (name) {
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check(declar, name);
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constants.push(name);
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});
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declar._ignoreConstant = true;
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});
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child.kind = "let";
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}
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});
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if (!constants.length) return;
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traverse(node, function (child) {
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if (child._ignoreConstant) return;
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if (t.isVariableDeclarator(child) || t.isFunctionDeclaration(child) || t.isClassDeclaration(child)) {
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check(child, child.id.name);
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} else if (t.isAssignmentExpression(child)) {
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check(child, child.left.name);
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}
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});
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};
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