initial code

.vscode/tasks.json

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+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "0.1.0",
+    "command": "tsc",
+    "isShellCommand": true,
+    "args": ["-w", "-p", "."],
+    "showOutput": "silent",
+    "isBackground": true,
+    "problemMatcher": "$tsc-watch"
+}

built/cardinal.d.ts

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+export declare type TwitterCard = SummaryCard | AppCard | PlayerCard | AmplifyCard;
+export interface ValueOrId {
+    value?: string;
+    id?: string;
+}
+export declare function parse(html: string, origin: string): TwitterCard;
+export interface SummaryCard {
+    card: "summary" | "summary_large_image";
+    origin: string;
+    /** The Twitter @username the card is attributed to. */
+    site: ValueOrId;
+    /** A concise title for the related content. */
+    title: string;
+    /** A description that concisely summarizes the content as appropriate for presentation within a Tweet. */
+    description: string;
+    /** A URL to a unique image representing the content of the page. */
+    image: string | null;
+    /** A text description of the image conveying the essential nature of an image to users who are visually impaired. */
+    imageAlt: string | null;
+}
+export interface AppCard {
+    card: "app";
+    site: ValueOrId;
+    description: string;
+    country: string;
+    appId: AppStoreData;
+    appUrl: AppStoreData;
+}
+export interface AppStoreData {
+    iphone: string;
+    ipad: string;
+    googleplay: string;
+}
+export interface PlayerCard {
+    card: "player";
+    /** The title of the content */
+    title: string;
+    /** The Twitter @username the card is attributed to */
+    site: ValueOrId;
+    /** A description of the content */
+    description: string;
+    player: string;
+    playerWidth: number;
+    playerHeight: number;
+    image: string;
+    imageAlt: string;
+    playerStream: string;
+    playerStreamContentType: string;
+}
+export interface AmplifyCard {
+    card: "amplify";
+    site: ValueOrId;
+    title: string;
+    description: string;
+    imageSrc: string;
+    imageWidth: number;
+    imageHeight: number;
+    amplifyVmap: string;
+    amplifyTeaserSegmentsStream: string;
+    amplifyContentId: string;
+    playerWidth: number;
+    playerHeight: number;
+    playerStreamContentType: string;
+    amplifyEmbeddable: boolean;
+    amplifyDynamicAds: boolean;
+    amplifyContentDurationSeconds: number;
+    amplifyShareId: string;
+}
+export declare function parseAmplify(head: HTMLHeadElement): AmplifyCard;