MarkdownLineType

type MarkdownLineType =
  | "expression"
  | "prose"
  | "heading"
  | "blockquote"
  | "list"
  | "code_fence"
  | "math_fence"
  | "table"
  | "table_separator"
  | "hr"
  | "wikilink"
  | "comment"
  | "empty";

Defined in: packages/engine/src/lexer/ExpressionLexer.ts:13

What a line is, structurally, before anything tries to evaluate it.