Grokking Node.js Design Patterns for Interviews/

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Solution: Prevent Accidental Mutation of Read-Only Settings

Solution: Prevent Accidental Mutation of Read-Only Settings

Use the set trap to block property writes and preserve configuration immutability.

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Solution explanation

  • Lines 2–6: We define the config object that contains fixed, application-wide settings.

    • This represents the real target object holding original values.

    • It must remain unchanged across the system’s runtime.

  • Lines 9–13: We wrap the config object in a Proxy to control all write attempts through the set() trap.

    • The set() trap runs whenever code tries to assign a value ...