vue.runtime.esm.js:1442 SyntaxError: The requested module '/config.js' does not provide an export named 'default'

This error message typically occurs when importing a module that does not have a default export. In this case, the module '/config.js' does not have a default export, so you cannot use the syntax `import config from '/config.js'`.

To fix this error, you can update your import statement to explicitly import the named export from the module:

import { someExport } from '/config.js';

Alternatively, you can add a default export to your '/config.js' module:

export default {
  someProperty: 'value',
  // other properties and methods
}