Enum StreamEvent 

#[non_exhaustive]
pub enum StreamEvent {
    Delta {
        content: String,
    },
    ReasoningDelta {
        content: String,
    },
    Usage(TokenUsage),
    Done,
}

A single event in an LLM streaming response.

#[non_exhaustive]: new variants (e.g. reasoning/tool-call streaming) may be added in a minor release without breaking downstream match arms — external consumers must include a _ => arm. Within this crate, exhaustive matching is still permitted.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Delta

Partial text content arrived.

Fields

content: String

The partial text chunk.

ReasoningDelta

Partial reasoning content arrived (GLM delta.reasoning_content, Anthropic thinking_delta).

Streaming/reasoning asymmetry (important): the non-streaming LLMClient::complete path promotes reasoning into content when the provider leaves content empty (notably GLM-4.7), so non-streaming callers transparently receive the final answer. The streaming path does not perform this promotion — it emits ReasoningDelta and Delta as separate events and leaves accumulation to the consumer. For reasoning-only models that put the answer in reasoning_content (GLM-4.7), streaming consumers must accumulate both ReasoningDelta and Delta chunks to reconstruct the full answer; accumulating Delta alone yields an empty result.

Fields

content: String

The partial reasoning chunk.

Usage(TokenUsage)

Final token usage statistics.

Done

Stream has ended.

Trait Implementations

impl Clone for StreamEvent

fn clone(&self) -> StreamEvent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StreamEvent

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

Formats the value using the given formatter.