Importing SVG Files in React Native Projects: A Comprehensive Guide

Using SVG files in your React Native projects can be as straightforward as using them in web applications. The react-native-svg-transformer library makes this possible by transforming your imported SVG images into React components. This guide will walk you through the installation, configuration, and usage of react-native-svg-transformer in your React Native projects.

Benefits

• Consistency: Use the same SVG files for both React Native and web projects.
• Flexibility: Easily import and use SVG files as React components.

Step-by-Step Installation and Configuration

Step 1: Install react-native-svg Library

First, ensure you have the react-native-svg library installed. This library provides the necessary components to render SVG images in React Native.

To install, run:

npm install react-native-svg

or

yarn add react-native-svg

For detailed installation instructions, refer to the react-native-svg GitHub page.

Step 2: Install react-native-svg-transformer Library

Next, install the react-native-svg-transformer library, which will transform your SVG files into React components.

To install, run:

npm install --save-dev react-native-svg-transformer

or

yarn add --dev react-native-svg-transformer

Step 3: Configure the React Native Packager

Depending on your setup (Expo or React Native CLI), the configuration will differ. Below are the configurations for different environments:

For Expo SDK v41.0.0 or Newer

Create or update your metro.config.js file with the following configuration:

const { getDefaultConfig } = require("expo/metro-config");

module.exports = (() => {
  const config = getDefaultConfig(__dirname);

  const { transformer, resolver } = config;

  config.transformer = {
    ...transformer,
    babelTransformerPath: require.resolve("react-native-svg-transformer/expo")
  };
  config.resolver = {
    ...resolver,
    assetExts: resolver.assetExts.filter((ext) => ext !== "svg"),
    sourceExts: [...resolver.sourceExts, "svg"]
  };

  return config;
})();

For React Native v0.72.1 or Newer

Create or update your metro.config.js file with the following configuration:

const { getDefaultConfig, mergeConfig } = require("@react-native/metro-config");

const defaultConfig = getDefaultConfig(__dirname);
const { assetExts, sourceExts } = defaultConfig.resolver;

/**
 * Metro configuration
 * https://reactnative.dev/docs/metro
 *
 * @type {import('metro-config').MetroConfig}
 */
const config = {
  transformer: {
    babelTransformerPath: require.resolve(
      "react-native-svg-transformer/react-native"
    )
  },
  resolver: {
    assetExts: assetExts.filter((ext) => ext !== "svg"),
    sourceExts: [...sourceExts, "svg"]
  }
};

module.exports = mergeConfig(defaultConfig, config);

For React Native v0.59 or Newer

Create or update your metro.config.js file with the following configuration:

const { getDefaultConfig } = require("metro-config");

module.exports = (async () => {
  const {
    resolver: { sourceExts, assetExts }
  } = await getDefaultConfig();
  return {
    transformer: {
      babelTransformerPath: require.resolve(
        "react-native-svg-transformer/react-native"
      )
    },
    resolver: {
      assetExts: assetExts.filter((ext) => ext !== "svg"),
      sourceExts: [...sourceExts, "svg"]
    }
  };
})();

React Native Projects Using Expo Modules

For projects using Expo modules without expo-cli, you may need to adjust the transformer path to correctly use React Native's transformer:

-require.resolve("react-native-svg-transformer")
+require.resolve("react-native-svg-transformer/react-native")

Alternatively, force Expo's transformer to always be used:

-require.resolve("react-native-svg-transformer")
+require.resolve("react-native-svg-transformer/expo")

Using TypeScript

If your project uses TypeScript, you need to declare the module for SVG files. Add the following to your declarations.d.ts file (create it if it doesn't exist):

declare module "*.svg" {
  import React from "react";
  import { SvgProps } from "react-native-svg";
  const content: React.FC<SvgProps>;
  export default content;
}

Usage

After installation and configuration, you can import and use SVG files in your React components just like any other component.

Example:

1. Import the SVG file:
   

   import Logo from "./logo.svg";
   

2. Use the SVG as a component:
   

   <Logo width={120} height={40} />
   

Additional Resources

• Demo Projects:
  • react-native-svg-example
  • react-native-svg-expo-example

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By following this guide, you should be able to seamlessly integrate SVG files into your React Native projects, enhancing your development workflow and maintaining consistency across different platforms.

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