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Non-exception Failures ↔ Unexpected behavior which doesn't throw Exception (in default JavaScript)

Non-exception Failures get flag by TS Static Type System

by default, JavaScript does not throw error for calling a non-existing property on a object returns undefined in JavaScript, whereas TypeScript throws an error

contrast Runtime Error

References​

  1. Logical Error ↔ Non-exception Failures & bug from bad Semantic in Source Code