next/dist/esm/build/babel/plugins/commonjs.js

The React Framework

import commonjsPlugin from 'next/dist/compiled/babel/plugin-transform-modules-commonjs';
// Handle module.exports in user code
export default function CommonJSModulePlugin(...args) {
    const commonjs = commonjsPlugin(...args);
    return {
        visitor: {
            Program: {
                exit (path, state) {
                    let foundModuleExports = false;
                    path.traverse({
                        MemberExpression (expressionPath) {
                            if (expressionPath.node.object.name !== 'module') return;
                            if (expressionPath.node.property.name !== 'exports') return;
                            foundModuleExports = true;
                        }
                    });
                    if (!foundModuleExports) {
                        return;
                    }
                    commonjs.visitor.Program.exit.call(this, path, state);
                }
            }
        }
    };
}

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