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47 lines
1.3 KiB
47 lines
1.3 KiB
"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; |