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# Dart Hide Combinator
The `hide` combinator is a namespace-control modifier applied to `import` or `export` directives in Dart. It acts as an exclusion filter, preventing specific top-level identifiers from a target library from being introduced into the current library's namespace, while allowing all other public identifiers to be resolved.
## Syntax
The combinator is appended to the end of an `import` or `export` statement, followed by a comma-separated list of the identifiers to be excluded.
```dart theme={"dark"}
// Import all public members except ClassA and topLevelFunction
import 'package:example/example.dart' hide ClassA, topLevelFunction;
// Re-export all public members except InternalMixin
export 'package:example/example.dart' hide InternalMixin;
```
## Mechanics and Behavior
* **Target Scope:** The `hide` combinator strictly operates on top-level declarations (e.g., `class`, `mixin`, `typedef`, top-level variables, and top-level functions). It cannot be used to filter out specific instance members, static methods, or properties encapsulated *within* a class.
* **Namespace Resolution:** When the Dart analyzer processes a directive with `hide`, it constructs the symbol table for the imported/exported library but explicitly drops the symbols listed in the `hide` clause. Attempting to reference a hidden identifier results in a compile-time `Undefined name` error, exactly as if the target library did not contain that declaration.
* **Export Propagation:** When applied to an `export` directive, `hide` prevents the specified identifiers from being re-exported. This modifies the public API surface of the aggregating library by omitting the hidden symbols from the exported namespace.
* **Combinator Chaining:** Dart allows multiple combinators (`show` and `hide`) to be chained on a single directive. When chained, the Dart compiler evaluates them sequentially from left to right.
```dart theme={"dark"}
// Evaluates left-to-right:
// 1. Shows only ClassA, ClassB, and ClassC
// 2. Hides ClassC from that filtered subset
import 'package:example/example.dart' show ClassA, ClassB, ClassC hide ClassC;
```
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