zshy/dist/tx-cjs-interop.js

Gold-standard build tool for TypeScript libraries

import * as ts from "typescript";
import { analyzeExports } from "./tx-analyze-exports.js";
export const createCjsInteropTransformer = () => (context) => {
    return (sourceFile) => {
        if (!ts.isSourceFile(sourceFile))
            return sourceFile;
        const { defaultExportNode, hasNamedExports } = analyzeExports(sourceFile);
        // Only apply transformation if we have exactly one default export and no named exports
        const shouldApplyInterop = defaultExportNode && !hasNamedExports;
        if (!shouldApplyInterop) {
            return sourceFile;
        }
        const visitor = (node) => {
            // Add module.exports = exports.default at the end of the file
            if (ts.isSourceFile(node)) {
                const statements = [...node.statements];
                // Add the CJS interop line at the end
                statements.push(ts.factory.createExpressionStatement(ts.factory.createAssignment(ts.factory.createPropertyAccessExpression(ts.factory.createIdentifier("module"), ts.factory.createIdentifier("exports")), ts.factory.createPropertyAccessExpression(ts.factory.createIdentifier("exports"), ts.factory.createIdentifier("default")))));
                return ts.factory.updateSourceFile(node, statements, node.isDeclarationFile, node.referencedFiles, node.typeReferenceDirectives, node.hasNoDefaultLib, node.libReferenceDirectives);
            }
            return ts.visitEachChild(node, visitor, context);
        };
        return ts.visitNode(sourceFile, visitor);
    };
};
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