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47 lines
1.3 KiB
47 lines
1.3 KiB
3 years ago
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"use strict";
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exports.__esModule = true;
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exports.default = _default;
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/**
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* Fixes block-shadowed let/const bindings in Safari 10/11.
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* https://kangax.github.io/compat-table/es6/#test-let_scope_shadow_resolution
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*/
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function _default({
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types: t
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}) {
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return {
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name: "transform-safari-block-shadowing",
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visitor: {
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VariableDeclarator(path) {
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// the issue only affects let and const bindings:
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const kind = path.parent.kind;
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if (kind !== "let" && kind !== "const") return; // ignore non-block-scoped bindings:
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const block = path.scope.block;
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if (t.isFunction(block) || t.isProgram(block)) return;
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const bindings = t.getOuterBindingIdentifiers(path.node.id);
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for (const name of Object.keys(bindings)) {
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let scope = path.scope; // ignore parent bindings (note: impossible due to let/const?)
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if (!scope.hasOwnBinding(name)) continue; // check if shadowed within the nearest function/program boundary
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while (scope = scope.parent) {
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if (scope.hasOwnBinding(name)) {
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path.scope.rename(name);
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break;
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}
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if (t.isFunction(scope.block) || t.isProgram(scope.block)) {
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break;
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}
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}
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}
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}
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}
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};
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}
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module.exports = exports.default;
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