### Build and Test Commands

Source: https://github.com/yaml/yaml-serde/blob/main/CLAUDE.md

Common development tasks executed via the Makes system within the project shell.

```bash
make shell cmd='cargo build'
make shell cmd='cargo test'
make shell cmd='cargo test test_name'          # Run a single test
make shell cmd='cargo clippy --tests -- -Dclippy::all -Dclippy::pedantic'
make shell cmd='cargo doc'
```

--------------------------------

### Configure Dependencies

Source: https://github.com/yaml/yaml-serde/blob/main/README.md

Required dependencies for using Serde YAML with derive macros.

```toml
[dependencies]
serde = { version = "1.0", features = ["derive"] }
yaml_serde = "0.10"
```

--------------------------------

### Serialize and Deserialize Structs

Source: https://github.com/yaml/yaml-serde/blob/main/README.md

Shows how to use Serde derive macros to handle custom structs.

```rust
use serde::{Serialize, Deserialize};

#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct Point {
    x: f64,
    y: f64,
}

fn main() -> Result<(), yaml_serde::Error> {
    let point = Point { x: 1.0, y: 2.0 };

    let yaml = yaml_serde::to_string(&point)?;
    assert_eq!(yaml, "x: 1.0\ny: 2.0\n");

    let deserialized_point: Point = yaml_serde::from_str(&yaml)?;
    assert_eq!(point, deserialized_point);
    Ok(())
}
```

--------------------------------

### Add Dependency

Source: https://github.com/yaml/yaml-serde/blob/main/README.md

Include the required dependencies in your Cargo.toml file.

```toml
[dependencies]
serde = "1.0"
yaml_serde = "0.10"
```

--------------------------------

### Migrate by Updating Imports

Source: https://github.com/yaml/yaml-serde/blob/main/README.md

Add the dependency directly and update your source code imports from serde_yaml to yaml_serde.

```toml
[dependencies]
yaml_serde = "0.10"
```

--------------------------------

### Serialize and Deserialize Collections

Source: https://github.com/yaml/yaml-serde/blob/main/README.md

Demonstrates converting a BTreeMap to a YAML string and back to a Rust type.

```rust
use std::collections::BTreeMap;

fn main() -> Result<(), yaml_serde::Error> {
    // You have some type.
    let mut map = BTreeMap::new();
    map.insert("x".to_string(), 1.0);
    map.insert("y".to_string(), 2.0);

    // Serialize it to a YAML string.
    let yaml = yaml_serde::to_string(&map)?;
    assert_eq!(yaml, "x: 1.0\ny: 2.0\n");

    // Deserialize it back to a Rust type.
    let deserialized_map: BTreeMap<String, f64> = yaml_serde::from_str(&yaml)?;
    assert_eq!(map, deserialized_map);
    Ok(())
}
```

--------------------------------

### Migrate with Package Renaming

Source: https://github.com/yaml/yaml-serde/blob/main/README.md

Use Cargo package renaming to migrate from serde_yaml without changing existing imports.

```toml
[dependencies]
serde_yaml = { package = "yaml_serde", version = "0.10" }
```

--------------------------------

### Serialize and Deserialize Enums

Source: https://github.com/yaml/yaml-serde/blob/main/README.md

Illustrates handling enums using YAML's !tag syntax for variant identification.

```rust
use serde::{Serialize, Deserialize};

#[derive(Serialize, Deserialize, PartialEq, Debug)]
enum Enum {
    Unit,
    Newtype(usize),
    Tuple(usize, usize, usize),
    Struct { x: f64, y: f64 },
}

fn main() -> Result<(), yaml_serde::Error> {
    let yaml = "
        - !Newtype 1
        - !Tuple [0, 0, 0]
        - !Struct {x: 1.0, y: 2.0}
    ";
    let values: Vec<Enum> = yaml_serde::from_str(yaml).unwrap();
    assert_eq!(values[0], Enum::Newtype(1));
    assert_eq!(values[1], Enum::Tuple(0, 0, 0));
    assert_eq!(values[2], Enum::Struct { x: 1.0, y: 2.0 });

    // The last two in YAML's block style instead:
    let yaml = "
        - !Tuple
          - 0
          - 0
          - 0
        - !Struct
          x: 1.0
          y: 2.0
    ";
    let values: Vec<Enum> = yaml_serde::from_str(yaml).unwrap();
    assert_eq!(values[0], Enum::Tuple(0, 0, 0));
    assert_eq!(values[1], Enum::Struct { x: 1.0, y: 2.0 });

    // Variants with no data can be written using !Tag or just the string name.
    let yaml = "
        - Unit  # serialization produces this one
        - !Unit
    ";
    let values: Vec<Enum> = yaml_serde::from_str(yaml).unwrap();
    assert_eq!(values[0], Enum::Unit);
    assert_eq!(values[1], Enum::Unit);

    Ok(())
}
```

--------------------------------

### Serialization Data Flow

Source: https://github.com/yaml/yaml-serde/blob/main/CLAUDE.md

The sequence of components involved in converting Rust types into YAML output.

```text
user's Rust type
  → ser::Serializer (Serde serializer)
  → libyaml::emitter::Emitter
  → YAML bytes/string
```

--------------------------------

### Deserialization Data Flow

Source: https://github.com/yaml/yaml-serde/blob/main/CLAUDE.md

The sequence of components involved in converting YAML input into Rust types.

```text
input bytes/str/reader
  → loader::Loader (libyaml parser)
  → loader::Document (event list)
  → de::Deserializer (Serde visitor dispatch)
  → user's Rust type
```

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