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