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Simple Pattern Lets Developers Embed React or Vue Components in Legacy Apps

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A lightweight micro-frontend pattern allows developers to add modern React, Vue, or Svelte components to legacy applications built with JSP, PHP, or Django without complex orchestration. The approach relies on two core elements: custom HTML tags placed in the legacy page and a self-contained JavaScript bundle that locates those tags and mounts components into them. Bundles are compiled in IIFE format using tools like Vite or Webpack, which prevents variable conflicts between embeds and the host page. Multiple embeds can be coordinated through build tools such as Gradle, npm workspaces, or Turborepo, with output files served as static assets via a backend like Spring Boot. The pattern is positioned as a simpler alternative to established solutions like Single-SPA or Module Federation, which require more complex runtime configuration.

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