tree-sitter-rust (v0.24.0) node types - Avro schema (https://docs.rs/tree-sitter-rust/latest/tree_sitter_rust/constant.NODE_TYPES.html), JSON schema, and some quick [not great quality] Serde structs (via https://app.quicktype.io/?l=rust)

1_node_types_schema.yaml

fields:
- name: node_types
  type:
    items:
      fields:
      - name: type
        type: string
      - name: named
        type: boolean
      - name: subtypes
        type:
        - 'null'
        - items:
            fields:
            - name: type
              type: string
            - name: named
              type: boolean
            name: subtypes
            namespace: genson.document_types.node_types_types
            type: record
          type: array
      - name: fields
        type:
        - 'null'
        - name: fields
          type: map
          values:
            fields:
            - name: multiple
              type: boolean
            - name: required
              type: boolean
            - name: types
              type:
                items:
                  fields:
                  - name: type
                    type: string
                  - name: named
                    type: boolean
                  name: types
                  namespace: genson.document_types.node_types_types.fields_values_types
                  type: record
                type: array
            name: fields_values
            namespace: genson.document_types.node_types_types
            type: record
      - name: children
        type:
        - 'null'
        - fields:
          - name: multiple
            type: boolean
          - name: required
            type: boolean
          - name: types
            type:
              items:
                fields:
                - name: type
                  type: string
                - name: named
                  type: boolean
                name: types
                namespace: genson.document_types.node_types_types.children_types
                type: record
              type: array
          name: children
          namespace: genson.document_types.node_types_types
          type: record
      - name: extra
        type:
        - 'null'
        - boolean
      - name: root
        type:
        - 'null'
        - boolean
      name: node_types
      namespace: genson.document_types
      type: record
    type: array
name: document
namespace: genson
type: record

2_node_types_schema.json

{
  "type": "record",
  "name": "document",
  "namespace": "genson",
  "fields": [
    {
      "name": "node_types",
      "type": {
        "type": "array",
        "items": {
          "type": "record",
          "name": "node_types",
          "namespace": "genson.document_types",
          "fields": [
            {
              "name": "type",
              "type": "string"
            },
            {
              "name": "named",
              "type": "boolean"
            },
            {
              "name": "subtypes",
              "type": [
                "null",
                {
                  "type": "array",
                  "items": {
                    "type": "record",
                    "name": "subtypes",
                    "namespace": "genson.document_types.node_types_types",
                    "fields": [
                      {
                        "name": "type",
                        "type": "string"
                      },
                      {
                        "name": "named",
                        "type": "boolean"
                      }
                    ]
                  }
                }
              ]
            },
            {
              "name": "fields",
              "type": [
                "null",
                {
                  "name": "fields",
                  "type": "map",
                  "values": {
                    "type": "record",
                    "name": "fields_values",
                    "namespace": "genson.document_types.node_types_types",
                    "fields": [
                      {
                        "name": "multiple",
                        "type": "boolean"
                      },
                      {
                        "name": "required",
                        "type": "boolean"
                      },
                      {
                        "name": "types",
                        "type": {
                          "type": "array",
                          "items": {
                            "type": "record",
                            "name": "types",
                            "namespace": "genson.document_types.node_types_types.fields_values_types",
                            "fields": [
                              {
                                "name": "type",
                                "type": "string"
                              },
                              {
                                "name": "named",
                                "type": "boolean"
                              }
                            ]
                          }
                        }
                      }
                    ]
                  }
                }
              ]
            },
            {
              "name": "children",
              "type": [
                "null",
                {
                  "type": "record",
                  "name": "children",
                  "namespace": "genson.document_types.node_types_types",
                  "fields": [
                    {
                      "name": "multiple",
                      "type": "boolean"
                    },
                    {
                      "name": "required",
                      "type": "boolean"
                    },
                    {
                      "name": "types",
                      "type": {
                        "type": "array",
                        "items": {
                          "type": "record",
                          "name": "types",
                          "namespace": "genson.document_types.node_types_types.children_types",
                          "fields": [
                            {
                              "name": "type",
                              "type": "string"
                            },
                            {
                              "name": "named",
                              "type": "boolean"
                            }
                          ]
                        }
                      }
                    }
                  ]
                }
              ]
            },
            {
              "name": "extra",
              "type": [
                "null",
                "boolean"
              ]
            },
            {
              "name": "root",
              "type": [
                "null",
                "boolean"
              ]
            }
          ]
        }
      }
    }
  ]
}

3_node_types_schema.rs

use serde::{Serialize, Deserialize};
use std::collections::HashMap;

#[derive(Serialize, Deserialize)]
pub struct Coordinate {
    node_types: Vec<NodeType>,
}

#[derive(Serialize, Deserialize)]
pub struct NodeType {
    children: Option<Children>,
    extra: Option<bool>,
    fields: Option<HashMap<String, Field>>,
    named: bool,
    root: Option<bool>,
    subtypes: Option<Vec<Subtype>>,
    #[serde(rename = "type")]
    node_type_type: String,
}

#[derive(Serialize, Deserialize)]
pub struct Children {
    multiple: bool,
    required: bool,
    types: Vec<ChildrenType>,
}

#[derive(Serialize, Deserialize)]
pub struct ChildrenType {
    named: bool,
    #[serde(rename = "type")]
    type_type: String,
}

#[derive(Serialize, Deserialize)]
pub struct Field {
    multiple: bool,
    required: bool,
    types: Vec<FieldType>,
}

#[derive(Serialize, Deserialize)]
pub struct FieldType {
    named: bool,
    #[serde(rename = "type")]
    type_type: String,
}

#[derive(Serialize, Deserialize)]
pub struct Subtype {
    named: bool,
    #[serde(rename = "type")]
    subtype_type: String,
}