zshy/dist/tx-analyze-exports.js

Gold-standard build tool for TypeScript libraries

import * as ts from "typescript";
// Shared function to analyze exports in a source file
export const analyzeExports = (sourceFile) => {
    let defaultExportNode = null;
    let hasNamedExports = false;
    const visitor = (node) => {
        // 1) export default <expr>;
        if (ts.isExportAssignment(node) && !node.isExportEquals) {
            defaultExportNode = node;
        }
        // 2) export default function/class/interface/type/enum …
        else if ((ts.isFunctionDeclaration(node) ||
            ts.isClassDeclaration(node) ||
            ts.isInterfaceDeclaration(node) ||
            ts.isTypeAliasDeclaration(node) ||
            ts.isEnumDeclaration(node)) &&
            node.modifiers?.some((m) => m.kind === ts.SyntaxKind.ExportKeyword) &&
            node.modifiers.some((m) => m.kind === ts.SyntaxKind.DefaultKeyword)) {
            defaultExportNode = node;
        }
        // 3) named re-exports (`export { a, b } from …` or `export { x }`)
        else if (ts.isExportDeclaration(node) && node.exportClause) {
            hasNamedExports = true;
        }
        // 3a) export * from "module" - also counts as named exports
        else if (ts.isExportDeclaration(node) && !node.exportClause && node.moduleSpecifier) {
            hasNamedExports = true;
        }
        // 4) named `export const/let/var …`
        else if (ts.isVariableStatement(node) && node.modifiers?.some((m) => m.kind === ts.SyntaxKind.ExportKeyword)) {
            hasNamedExports = true;
        }
        // 5) named `export function …` (but _not_ default)
        else if (ts.isFunctionDeclaration(node) &&
            node.modifiers?.some((m) => m.kind === ts.SyntaxKind.ExportKeyword) &&
            !node.modifiers.some((m) => m.kind === ts.SyntaxKind.DefaultKeyword)) {
            hasNamedExports = true;
        }
        // 6) named `export class …` (but _not_ default)
        else if (ts.isClassDeclaration(node) &&
            node.modifiers?.some((m) => m.kind === ts.SyntaxKind.ExportKeyword) &&
            !node.modifiers.some((m) => m.kind === ts.SyntaxKind.DefaultKeyword)) {
            hasNamedExports = true;
        }
        ts.forEachChild(node, visitor);
    };
    ts.forEachChild(sourceFile, visitor);
    return { defaultExportNode, hasNamedExports };
};
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