52 lines
1.4 KiB
JavaScript
52 lines
1.4 KiB
JavaScript
import { declare } from "@babel/helper-plugin-utils";
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import syntaxExportNamespaceFrom from "@babel/plugin-syntax-export-namespace-from";
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import { types as t } from "@babel/core";
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export default declare(api => {
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api.assertVersion(7);
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return {
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name: "proposal-export-namespace-from",
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inherits: syntaxExportNamespaceFrom,
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visitor: {
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ExportNamedDeclaration(path) {
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const { node, scope } = path;
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const { specifiers } = node;
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const index = t.isExportDefaultSpecifier(specifiers[0]) ? 1 : 0;
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if (!t.isExportNamespaceSpecifier(specifiers[index])) return;
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const nodes = [];
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if (index === 1) {
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nodes.push(
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t.exportNamedDeclaration(null, [specifiers.shift()], node.source),
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);
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}
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const specifier = specifiers.shift();
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const { exported } = specifier;
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const uid = scope.generateUidIdentifier(exported.name);
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nodes.push(
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t.importDeclaration(
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[t.importNamespaceSpecifier(uid)],
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t.cloneNode(node.source),
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),
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t.exportNamedDeclaration(null, [
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t.exportSpecifier(t.cloneNode(uid), exported),
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]),
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);
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if (node.specifiers.length >= 1) {
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nodes.push(node);
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}
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const [importDeclaration] = path.replaceWithMultiple(nodes);
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path.scope.registerDeclaration(importDeclaration);
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},
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},
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};
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});
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