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import {isTopLevelDeclaration} from "../parser/tokenizer";
import {TokenType as tt} from "../parser/tokenizer/types";
export const EMPTY_DECLARATION_INFO = {
typeDeclarations: new Set(),
valueDeclarations: new Set(),
};
/**
* Get all top-level identifiers that should be preserved when exported in TypeScript.
*
* Examples:
* - If an identifier is declared as `const x`, then `export {x}` should be preserved.
* - If it's declared as `type x`, then `export {x}` should be removed.
* - If it's declared as both `const x` and `type x`, then the export should be preserved.
* - Classes and enums should be preserved (even though they also introduce types).
* - Imported identifiers should be preserved since we don't have enough information to
* rule them out. --isolatedModules disallows re-exports, which catches errors here.
*/
export default function getDeclarationInfo(tokens) {
const typeDeclarations = new Set();
const valueDeclarations = new Set();
for (let i = 0; i < tokens.tokens.length; i++) {
const token = tokens.tokens[i];
if (token.type === tt.name && isTopLevelDeclaration(token)) {
if (token.isType) {
typeDeclarations.add(tokens.identifierNameForToken(token));
} else {
valueDeclarations.add(tokens.identifierNameForToken(token));
}
}
}
return {typeDeclarations, valueDeclarations};
}
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