v1 checkpoint

This commit is the initial checkpoint for a functioning converter with
all tests passing.

dist/types.d.ts

@@ -0,0 +1,41 @@
+export type TokenRole = 'open' | 'close' | 'block';
+export interface Token {
+    role: TokenRole;
+    value: string;
+    sequence?: string;
+    tag?: TagType;
+    groups?: {
+        [key: string]: string;
+    };
+    /** For link tokens: the href and optional title. */
+    href?: string;
+    title?: string;
+    meta?: Record<string, string>;
+}
+/**
+ * A Tag is the core abstraction: it knows how to match markdown syntax,
+ * convert it to HTML, and convert the HTML back to markdown. Tags are
+ * registered by HTML selector (e.g. 'STRONG,B') so the converter can
+ * look them up during HTML→markdown conversion.
+ */
+export interface TagType {
+    element: string[];
+    opener: string[];
+    closer: string | null;
+    precedence: number;
+    isBlock: boolean;
+    template?: string;
+    pattern?: RegExp | null;
+    showDelimitersInEditorNodes?: boolean;
+    aliases?: string[];
+    tokenize(role: TokenRole, sequence: string, value: string): Token | null;
+    toHTML: (token: Token, callback: Function) => string;
+    toMarkdown: (element: HTMLElement, callback: Function) => string;
+    toEditorNode: (token: Token, callback: Function) => Node | null;
+}
+export interface TagCollectionType {
+    tags: Record<string, TagType>;
+    ordered: TagType[];
+    map: Map<string, TagType[]>;
+    getByElementName(element: string): TagType | undefined;
+}