20 lines
459 B
JavaScript
20 lines
459 B
JavaScript
import * as t from "babel-types";
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export default function () {
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return {
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visitor: {
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Program(path, state) {
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if (state.opts.strict === false) return;
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let { node } = path;
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for (let directive of (node.directives: Array<Object>)) {
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if (directive.value.value === "use strict") return;
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}
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path.unshiftContainer("directives", t.directive(t.directiveLiteral("use strict")));
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}
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}
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};
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}
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