614b486780
* migrate to named babel types imports * perf: transform babel types import to destructuring * fix merge errors * apply plugin to itself
24 lines
803 B
TypeScript
24 lines
803 B
TypeScript
import { environmentVisitor } from "@babel/helper-replace-supers";
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import traverse from "@babel/traverse";
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import { numericLiteral, unaryExpression } from "@babel/types";
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import type * as t from "@babel/types";
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import type { NodePath, Visitor } from "@babel/traverse";
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export default function rewriteThis(programPath: NodePath) {
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// Rewrite "this" to be "undefined".
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traverse(programPath.node, { ...rewriteThisVisitor, noScope: true });
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}
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/**
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* A visitor to walk the tree, rewriting all `this` references in the top-level scope to be
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* `void 0` (undefined).
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*/
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const rewriteThisVisitor: Visitor = traverse.visitors.merge([
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environmentVisitor,
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{
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ThisExpression(path: NodePath<t.ThisExpression>) {
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path.replaceWith(unaryExpression("void", numericLiteral(0), true));
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},
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},
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]);
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