Fixing JsonRpcProvider Error In Aurora Swap Widget

by Alex Johnson 51 views

Encountering errors while integrating widgets into your React application can be frustrating. This article delves into a specific issue encountered with the @aurora-is-near/intents-swap-widget, focusing on the JsonRpcProvider constructor error. We will explore the error context, environment setup, code implementation, and potential solutions to resolve this problem. If you're facing a similar challenge, this guide is designed to provide a comprehensive understanding and effective troubleshooting steps.

Understanding the JsonRpcProvider Constructor Error

The primary issue at hand is the TypeError: near_api_js__WEBPACK_IMPORTED_MODULE_0__.providers.JsonRpcProvider is not a constructor. This error arises during the initialization of the module, leading to the immediate crash of the React application upon loading, presenting a blank screen. Essentially, the application fails to instantiate the JsonRpcProvider class from the near-api-js library, indicating a fundamental problem with how the module is being imported and used within the widget.

To fully grasp the significance, let’s break down the key components. The JsonRpcProvider is a critical class within near-api-js that facilitates communication with the NEAR blockchain. It's responsible for sending requests and receiving responses from the NEAR network, enabling essential functionalities such as reading blockchain data, submitting transactions, and querying account states. When this constructor is not correctly recognized, the widget cannot interact with the NEAR blockchain, rendering it non-functional.

The error message itself points to an issue with the way the widget is trying to access JsonRpcProvider. In a Webpack environment, the common namespace import pattern can sometimes lead to unexpected behavior, especially when dealing with libraries that have specific bundling requirements. This is because Webpack's module resolution and bundling process might not correctly interpret the intended structure of the imported library, leading to parts of it being undefined or inaccessible. In this particular scenario, it results in providers.JsonRpcProvider being seen as undefined, hence the "is not a constructor" error. The ramifications of this error are significant. It doesn't just affect a minor feature; instead, it halts the entire application, making it unusable. This highlights the importance of correctly configuring the build environment and module imports to ensure that all necessary components are properly loaded and instantiated.

Environment and Setup Details

To accurately diagnose and resolve the JsonRpcProvider error, a thorough understanding of the environment and setup is crucial. Here’s a breakdown of the key components:

  • Package Version: The @aurora-is-near/intents-swap-widget is running on version v3.11.12. This detail is important as specific versions might have known issues or require particular configurations.
  • React Version: The React application is built on version 18.3.1. Compatibility between React and the widget is essential, as newer or older versions might introduce conflicts.
  • Bundler: Webpack 5 is being used, integrated via Create React App (CRA) with CRACO (Create React App Configuration Override). Webpack is a powerful tool, but its configuration can be complex, and misconfigurations often lead to errors.
  • Ethers Version: Ethers.js, another critical library for interacting with blockchains, is at version 6.13.4. Ensuring compatibility between Ethers.js and the widget is necessary.
  • Node Polyfills: The setup was tested both with and without Node.js polyfills (specifically crypto-browserify, stream-browserify, buffer, and process). Polyfills are often required to bridge the gap between Node.js environments and browser environments, but incorrect usage can sometimes cause issues.

Webpack Configuration Attempts

Two primary Webpack configurations were attempted to address the issue:

  1. Minimal Configuration: This approach follows the recommendation that polyfills are no longer necessary. The configuration primarily focuses on setting fullySpecified: false for *.m?js files. This setting is intended to handle ES module resolution in Webpack.

    // craco.config.js
module.exports = {
  webpack: {
    configure: (webpackConfig) => {
      webpackConfig.module.rules.unshift({
        test: /\.m?js$/,
        resolve: {
          fullySpecified: false,
        },
      });
      return webpackConfig;
    },
  },
};

  2. Configuration with Node.js Polyfills: This approach includes explicit polyfills for crypto, stream, and buffer, along with a ProvidePlugin for process and Buffer. This configuration is more comprehensive and aims to ensure that all Node.js-related dependencies are correctly provided in the browser environment.

    // craco.config.js with polyfills
const webpack = require('webpack');
module.exports = {
  webpack: {
    configure: (webpackConfig) => {
      webpackConfig.resolve.fallback = {
        crypto: require.resolve('crypto-browserify'),
        stream: require.resolve('stream-browserify'),
        buffer: require.resolve('buffer'),
      };
      webpackConfig.plugins.push(
        new webpack.ProvidePlugin({
          process: 'process/browser',
          Buffer: ['buffer', 'Buffer'],
        })
      );
      // ...same fullySpecified rule
      return webpackConfig;
    },
  },
};

Despite these configurations, the error persisted, suggesting the issue isn't solely related to polyfills or basic module resolution.

Code Implementation and Widget Usage

Examining the code implementation reveals how the @aurora-is-near/intents-swap-widget is being integrated into the React application. This involves looking at both the widget's component structure and its usage within the parent component.

Component Implementation (NearIntentsWidget.js)

The NearIntentsWidget component serves as a wrapper for the WidgetSwap component from the @aurora-is-near/intents-swap-widget library. It configures the widget with specific parameters required for the swap functionality.

import React from 'react';
import { WidgetSwap } from '@aurora-is-near/intents-swap-widget';
import '@aurora-is-near/intents-swap-widget/dist/style.css';

const NearIntentsWidget = ({ walletAddress, depositAddress, onClose }) => {
  const config = {
    appName: 'Optima Financial',
    connectedWallets: {
      default: walletAddress,
    },
    sendAddress: depositAddress,
    allowedTargetTokensList: ['bsc.usdt'],
    allowedTargetChainsList: ['bsc'],
    enableAutoTokensSwitching: false,
    slippageTolerance: 100,
  };

  return (
    <div className="sw">
      <WidgetSwap {...config} />
    </div>
  );
};

export default NearIntentsWidget;

Key aspects of this component:

  • Imports: It imports WidgetSwap from the widget library and the associated CSS for styling.
  • Configuration: The config object is crucial, as it defines the widget's behavior, including the application name, connected wallets, deposit address, allowed tokens and chains, and slippage tolerance.
  • Props: The component accepts walletAddress, depositAddress, and onClose as props, allowing it to be dynamically configured by its parent component.
  • Rendering: It renders a WidgetSwap component with the spread config object, passing all configuration parameters.

Usage in Parent Component

The parent component demonstrates how the NearIntentsWidget is integrated into the application's UI. It uses React's state management to conditionally render the widget within a modal.

import NearIntentsWidget from './NearIntentsWidget';
// Inside component
const [showNearWidget, setShowNearWidget] = useState(false);
// Render
{
  showNearWidget && (
    <Modal show={showNearWidget} onHide={() => setShowNearWidget(false)}>
      <Modal.Header closeButton>
        <Modal.Title>Swap Any Token to USDT</Modal.Title>
      </Modal.Header>
      <Modal.Body>
        <NearIntentsWidget
          walletAddress={walletAddress}
          depositAddress={depositAddress}
          onClose={() => setShowNearWidget(false)}
        />
      </Modal.Body>
    </Modal>
  )
}

Key observations:

  • Conditional Rendering: The widget is rendered conditionally based on the showNearWidget state variable. This is a common pattern for modals or other components that should not always be visible.
  • Modal Integration: The widget is placed inside a Modal component, providing a clean and organized UI.
  • Props Passing: The parent component passes walletAddress, depositAddress, and onClose props to the NearIntentsWidget, ensuring it receives the necessary context and functionality.

This implementation shows a standard approach to integrating the widget within a React application. However, the error suggests that the issue lies deeper, possibly within the widget's internal dependencies or how it interacts with the build environment.

Root Cause Analysis of the Error

The root cause of the JsonRpcProvider constructor error is pinpointed to the way the @aurora-is-near/intents-swap-widget imports near-api-js. Specifically, the widget attempts to import near-api-js using a namespace import, which doesn't work correctly in Webpack environments.

// Incorrect Import (approximation):
import * as near_api_js from 'near-api-js';
const provider = new near_api_js.providers.JsonRpcProvider(...);

In Webpack, namespace imports can sometimes lead to issues with how modules are bundled and accessed. The expected structure might not be correctly represented, causing specific components, like providers.JsonRpcProvider, to be undefined.

Potential Solutions to Resolve the Issue

Given the root cause analysis, several potential solutions can be explored to resolve the JsonRpcProvider constructor error. Each approach aims to address the import issue and ensure that near-api-js is correctly bundled and accessed within the widget.

1. Modify Widget Import Statements

The most direct approach is to modify the import statements within the @aurora-is-near/intents-swap-widget itself. Instead of using a namespace import, switch to a direct import of JsonRpcProvider.

// Corrected Import:
import { providers } from 'near-api-js';
const provider = new providers.JsonRpcProvider(...);

This change ensures that JsonRpcProvider is explicitly imported, making it directly accessible and resolving the constructor error. However, modifying files within node_modules is generally discouraged as these changes can be overwritten during updates. Therefore, this solution might be more suitable for local testing or if you have control over the widget's source code.

2. Utilize Webpack Aliases

Webpack aliases provide a way to map module requests to different paths. This can be used to force the correct resolution of near-api-js within the widget.

In your craco.config.js, add a resolve alias:

const path = require('path');

module.exports = {
  webpack: {
    alias: {
      'near-api-js': path.resolve(__dirname, 'node_modules/near-api-js'),
    },
  },
};

This configuration tells Webpack to always resolve near-api-js imports to the specific path in node_modules, ensuring the correct module is used.

3. Check and Adjust near-api-js Version

Sometimes, compatibility issues arise between different versions of libraries. Verify the version of near-api-js being used by the widget and ensure it is compatible with the widget's requirements. You can check the widget's package.json file or your project's lock file (e.g., package-lock.json or yarn.lock) to determine the installed version.

If there's a version mismatch or a known incompatibility, try updating or downgrading near-api-js to a compatible version.

4. Review Webpack Configuration for Module Resolution

A misconfigured Webpack setup can lead to module resolution issues. Review your Webpack configuration, particularly the resolve section, for any settings that might interfere with module resolution. Ensure that common settings like extensions and modules are correctly configured.

// Example Webpack Configuration (webpack.config.js or similar)
module.exports = {
  // ...
  resolve: {
    extensions: ['.js', '.jsx', '.ts', '.tsx'],
    modules: [path.resolve(__dirname, 'src'), 'node_modules'],
  },
  // ...
};

5. Examine and Handle near-api-js Dependencies

near-api-js might have its own dependencies that need to be correctly handled by Webpack. Investigate the dependencies of near-api-js and ensure they are properly included in your project. If any dependencies are missing or misconfigured, this can lead to runtime errors.

6. Ensure Correct near-api-js Usage

Verify that the near-api-js library is being used correctly within the widget. Review the widget's code for any incorrect instantiation or usage patterns that might cause the JsonRpcProvider to fail. Refer to the near-api-js documentation for guidance on proper usage.

7. Contact Widget Maintainers or Community

If the issue persists despite the above solutions, consider reaching out to the maintainers of the @aurora-is-near/intents-swap-widget or the broader community for assistance. They might be aware of specific issues or have additional insights into resolving the error.

Conclusion

The JsonRpcProvider constructor error in the @aurora-is-near/intents-swap-widget can be a challenging issue to resolve, but a systematic approach to troubleshooting can help identify and address the root cause. By understanding the error context, environment setup, code implementation, and potential solutions, you can effectively resolve the problem and ensure the widget functions correctly within your React application.

Remember to consider each solution carefully and test it thoroughly to determine its effectiveness in your specific environment. Debugging module import and resolution issues often requires patience and attention to detail, but with the right approach, you can overcome these challenges and successfully integrate the widget into your project.

For more information on NEAR blockchain and related technologies, visit the official NEAR Protocol website. This comprehensive resource provides extensive documentation, tutorials, and community support to help you build and deploy applications on the NEAR network.