import { isThenable } from '@sentry/core';
import { getFinalConfigObject } from './getFinalConfigObject.js';

/**
 * Wraps a user's Next.js config and applies Sentry build-time behavior (instrumentation + sourcemap upload).
 *
 * Supports both object and function Next.js configs.
 *
 * @param nextConfig - The user's exported Next.js config
 * @param sentryBuildOptions - Options to configure Sentry's build-time behavior
 * @returns The wrapped Next.js config (same shape as the input)
 */
function withSentryConfig(nextConfig, sentryBuildOptions = {}) {
  const castNextConfig = (nextConfig ) || {};
  if (typeof castNextConfig === 'function') {
    return function ( ...webpackConfigFunctionArgs) {
      const maybePromiseNextConfig = castNextConfig.apply(
        this,
        webpackConfigFunctionArgs,
      );

      if (isThenable(maybePromiseNextConfig)) {
        return maybePromiseNextConfig.then(promiseResultNextConfig => {
          return getFinalConfigObject(promiseResultNextConfig, sentryBuildOptions);
        });
      }

      return getFinalConfigObject(maybePromiseNextConfig, sentryBuildOptions);
    } ;
  } else {
    return getFinalConfigObject(castNextConfig, sentryBuildOptions) ;
  }
}

export { withSentryConfig };
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