25 lines
647 B
JavaScript
25 lines
647 B
JavaScript
import syntaxOptionalCatchBinding from "@babel/plugin-syntax-optional-catch-binding";
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export default function(babel) {
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const { types: t } = babel;
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return {
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inherits: syntaxOptionalCatchBinding,
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visitor: {
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CatchClause(path) {
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if (path.node.param === null || !t.isIdentifier(path.node.param)) {
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return;
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}
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const binding = path.scope.getOwnBinding(path.node.param.name);
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if (binding.constantViolations.length > 0) {
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return;
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}
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if (!binding.referenced) {
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const paramPath = path.get("param");
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paramPath.remove();
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}
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},
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},
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};
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}
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