39 lines
1.1 KiB
Plaintext
39 lines
1.1 KiB
Plaintext
import {TokenType as tt} from "../parser/tokenizer/types";
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/**
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* Common method sharing code between CJS and ESM cases, since they're the same here.
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*/
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export default function shouldElideDefaultExport(
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isTypeScriptTransformEnabled,
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keepUnusedImports,
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tokens,
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declarationInfo,
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) {
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if (!isTypeScriptTransformEnabled || keepUnusedImports) {
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return false;
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}
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const exportToken = tokens.currentToken();
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if (exportToken.rhsEndIndex == null) {
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throw new Error("Expected non-null rhsEndIndex on export token.");
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}
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// The export must be of the form `export default a` or `export default a;`.
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const numTokens = exportToken.rhsEndIndex - tokens.currentIndex();
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if (
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numTokens !== 3 &&
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!(numTokens === 4 && tokens.matches1AtIndex(exportToken.rhsEndIndex - 1, tt.semi))
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) {
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return false;
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}
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const identifierToken = tokens.tokenAtRelativeIndex(2);
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if (identifierToken.type !== tt.name) {
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return false;
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}
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const exportedName = tokens.identifierNameForToken(identifierToken);
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return (
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declarationInfo.typeDeclarations.has(exportedName) &&
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!declarationInfo.valueDeclarations.has(exportedName)
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);
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}
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