Struct StreamChunk 

pub struct StreamChunk {
    pub delta: String,
    pub reasoning: Option<String>,
    pub is_final: bool,
    pub token_count: usize,
}

A chunk of content from a streaming response.

Fields

delta: String

Text delta for this chunk.

reasoning: Option<String>

Reasoning/thinking delta (chain-of-thought from thinking models).

is_final: bool

Whether this is the final chunk.

token_count: usize

Approximate token count for this chunk (estimated).

Implementations

impl StreamChunk

pub fn delta(text: impl Into<String>) -> Self

Create a new non-final chunk.

pub fn reasoning(text: impl Into<String>) -> Self

Create a reasoning/thinking chunk.

pub fn final_chunk() -> Self

Create a final chunk.

pub fn error(message: impl Into<String>) -> Self

Create an error chunk.

pub fn with_token_estimate(self) -> Self

Estimate tokens (rough approximation: ~4 chars per token).

Trait Implementations

impl Clone for StreamChunk

fn clone(&self) -> StreamChunk

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for StreamChunk

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.