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What Happens in JavaScript When You Reassign an Imported Binding
- JavaScript modules handle imports differently than local variables, creating live connections between files.
- ECMAScript Modules (ESM) maintain live references to exported variables, updating values across files.
- Reassigning imported bindings in ESM is prohibited to maintain the module structure.
- Live bindings in ESM dynamically reflect changes in the original source, ensuring synchronization.
- In contrast, CommonJS modules export objects, not live references, resulting in static data imports.
- In CommonJS, reassignment of imported bindings is allowed, impacting the shared object's properties directly.
- However, CommonJS lacks automatic synchronization across files like ESM, requiring manual handling for shared state.
- ESM's structured system enforces read-only imported bindings, highlighting the differences between ESM and CommonJS.
- Understanding how JavaScript manages imported bindings between modules helps prevent unexpected behaviors in code.
- ESM provides a more controlled and synchronized approach to handling modules, while CommonJS offers more flexibility with potential for shared state inconsistencies.
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