lib/format/markdown.js
function pushSnapshotCode(state, node) {
  state.currentSnapshotList.push({
    lang: node.lang,
    code: normalizeNewlines(node.value)
  });
}
function pushSnapshotCode(state, node) {
  state.currentSnapshotList.push({
    lang: node.lang,
    code: normalizeNewlines(node.value)
  });
}
pushSnapshotCode adds snapshot to the current snapshot.

@param {SerializerState} state Current state.
@param {*} node Markdown node.