Why Your Cat Became a Dog (And TypeScript Finally Noticed)
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TypeScript's structural type system allows assigning a Dog instance to a Cat variable if they have identical shapes, which can lead to logic errors. JavaScript private fields provide a solution by enforcing nominal typing, making classes with private fields structurally incompatible even when their public APIs are identical.
Table of contents
ContentsThe Surprising ProblemThe Problem with Structural TypingPrivate Fields enforce Nominal TypingPractical Use CasesWhen Bundlers Create Multiple InstancesSort: