code-split-plugin-api 1.0.0-alpha.4

//! A [`Edge`] — a directed edge between two nodes (an import, a call, a
//! containment, …). The `kind` is the plugin's own vocabulary; its semantics
//! (flow vs structural, label, hint) come from a matching
//! [`EdgeKindSpec`](crate::EdgeKindSpec).

use crate::attrs::Attributes;
use crate::node::NodeId;
use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Edge {
    pub source: NodeId,
    pub target: NodeId,
    /// The plugin's vocabulary — "uses"/"contains"/"reexports"/… today;
    /// "calls"/"reads"/"writes"/… later. Not interpreted by the core.
    pub kind: String,
    /// 1-based line in the *source* node's file where this edge is declared
    /// (e.g. the `use`/`import` statement). `None` when the plugin can't place
    /// it (synthetic/aggregated edges). Lets `check` point a cycle violation at
    /// a concrete spot to break. Omitted from JSON when absent.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub line: Option<u32>,
    /// Free-form attributes (e.g. `external`, or language-specific keys),
    /// described by the level's `edge_attributes` dictionary. Flattened into
    /// the edge JSON object.
    #[serde(flatten)]
    pub attrs: Attributes,
}