function transform(file, { j }) {
  const ast = j(file.source);

  // Find the import specifier for left-pad in case of aliases
  const leftPadImport = ast.find(j.ImportDeclaration, {
    source: { value: 'left-pad' }
  });

  // TODO: Get import specifier name
  const leftPadLocalName = '';

  leftPadImport.remove();

  // Replace all usage of the leftPadLocalName with native padStart
  ast
    .find(j.CallExpression, { callee: { name: leftPadLocalName } })
    .forEach(callPath => {
        const args = callPath.node.arguments;
        if (args.length >= 2) {
          const stringArg = args[0];
          const targetLength = args[1];
          const padString = args.length > 2 ? args[2] : j.literal(' ');

          // Replace with the padStart call
          j(callPath).replaceWith(
            j.callExpression(
              j.memberExpression(stringArg, j.identifier('padStart')),
              [targetLength, padString]
            )
          );
        }
    });

  return ast.toSource();
}

export default transform;