<ul data-eligibleForWebStory="true"><li>TypeScript checks types based on the shape of values rather than where and how they were declared.</li><li>This is known as structural typing, in contrast to nominal typing used in most statically typed languages.</li><li>TypeScript focuses on the structure of values to ensure compatibility, enabling more flexible coding.</li><li>It allows for handling extra fields in objects as long as the required structure matches.</li><li>TypeScript performs type checking by examining object structures property by property, even for nested values.</li><li>Interfaces in TypeScript serve as structural contracts rather than carrying identity.</li><li>Structural typing enables easier reuse of functions with varying inputs as long as the shape requirements are met.</li><li>However, the flexibility of structural typing may lead to security vulnerabilities if not accompanied by appropriate checks.</li><li>TypeScript's focus on shape comparison can be advantageous for writing versatile functions but requires additional security measures at runtime.</li><li>Care must be taken with structural typing in scenarios where object shape alone determines access or authorization.</li></ul>

Why TypeScript Structural Typing Works

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