#SchemaUtils in-depth problem analysis

#FAQ

#internal field leak

The chained DSL will generate internal fields such as _label, _customMessages, _required, etc. When targeting OpenAPI or external systems, toJsonSchema() should be used in the Builder phase to output clean JSON Schema.

#required synchronization

pick(), omit(), and partial() synchronize required across supported nested Schema positions, including object properties, tuple and additional items, compositions, dependencies, and local definitions. partial(schema, fields) only makes the selected object-level fields optional while preserving unrelated constraints.

#deep copy limit

SchemaUtils.clone() preserves function references, clones RegExp and Date values, supports circular references, and retains property descriptors. Functions remain runtime-only values: cloning does not make a Schema containing functions serializable or stable across processes.

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#Corresponding sample file

Example entry: schema-utils-advanced-issues.ts Description: Covers the three most vulnerable points of internal field leakage, required synchronization and clone() deep copy boundaries.