Add shared types and client core packages

The wire contract every client codes against, plus the annotation engine,
canvas renderer and connection policy shared by both clients.

Claude-Session: https://claude.ai/code/session_01SS9F92jb51bMCRCKem6QtD

packages/shared-types/package.json

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+{
+  "name": "@pistation/shared-types",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "main": "./src/index.ts",
+  "types": "./src/index.ts",
+  "exports": {
+    ".": "./src/index.ts"
+  }
+}

packages/shared-types/src/annotation.ts

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+export const ANNOTATION_TOOLS = [
+  "pen",
+  "highlighter",
+  "arrow",
+  "rectangle",
+  "ellipse",
+  "laser"
+] as const;
+
+export type AnnotationTool = (typeof ANNOTATION_TOOLS)[number];
+
+export interface NormalizedPoint {
+  x: number;
+  y: number;
+}
+
+export interface StrokeStyle {
+  color: string;
+  width: number;
+  opacity: number;
+}
+
+export interface StrokeStartEvent {
+  type: "stroke.start";
+  strokeId: string;
+  tool: AnnotationTool;
+  style: StrokeStyle;
+  point: NormalizedPoint;
+}
+
+export interface StrokeAppendEvent {
+  type: "stroke.append";
+  strokeId: string;
+  points: NormalizedPoint[];
+}
+
+export interface StrokeEndEvent {
+  type: "stroke.end";
+  strokeId: string;
+}
+
+export interface StrokeEraseEvent {
+  type: "stroke.erase";
+  strokeIds: string[];
+}
+
+export interface CanvasClearEvent {
+  type: "canvas.clear";
+}
+
+export interface PointerMoveEvent {
+  type: "pointer.move";
+  point: NormalizedPoint | null;
+  color: string;
+}
+
+export type AnnotationEvent =
+  | StrokeStartEvent
+  | StrokeAppendEvent
+  | StrokeEndEvent
+  | StrokeEraseEvent
+  | CanvasClearEvent
+  | PointerMoveEvent;
+
+export interface CompletedStroke {
+  strokeId: string;
+  authorId: string;
+  tool: AnnotationTool;
+  style: StrokeStyle;
+  points: NormalizedPoint[];
+}
+
+export const DEFAULT_STROKE_STYLE: StrokeStyle = {
+  color: "#ff2d55",
+  width: 0.004,
+  opacity: 1
+};
+
+export const HIGHLIGHTER_STYLE: StrokeStyle = {
+  color: "#ffd60a",
+  width: 0.018,
+  opacity: 0.35
+};
+
+export function isPersistentTool(tool: AnnotationTool): boolean {
+  return tool !== "laser";
+}

packages/shared-types/src/api.ts

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+import type { Kiosk, KioskLayout } from "./kiosk.js";
+import type { ParticipantRole } from "./room.js";
+
+export interface ApiError {
+  error: string;
+  message: string;
+}
+
+export interface KioskRegisterRequest {
+  enrollmentToken: string;
+  hardwareId: string;
+}
+
+export interface KioskRegisterResponse {
+  kioskId: string;
+  kioskToken: string;
+  roomName: string;
+  livekitUrl: string;
+  rotationSeconds: number;
+}
+
+export interface KioskPinResponse {
+  pin: string;
+  issuedAt: number;
+  expiresAt: number;
+}
+
+export interface KioskSessionResponse {
+  roomName: string;
+  livekitUrl: string;
+  accessToken: string;
+  participantId: string;
+}
+
+export interface JoinRequest {
+  pin: string;
+  displayName: string;
+}
+
+export interface JoinResponse {
+  sessionId: string;
+  roomName: string;
+  kioskName: string;
+  livekitUrl: string;
+  accessToken: string;
+  participantId: string;
+  displayName: string;
+  role: ParticipantRole;
+  expiresAt: number;
+}
+
+export interface SessionRefreshRequest {
+  sessionId: string;
+}
+
+export interface SessionRefreshResponse {
+  roomName: string;
+  livekitUrl: string;
+  accessToken: string;
+  participantId: string;
+  displayName: string;
+  role: ParticipantRole;
+  expiresAt: number;
+}
+
+export interface AdminLoginRequest {
+  email: string;
+  password: string;
+}
+
+export interface AdminLoginResponse {
+  accessToken: string;
+  email: string;
+  expiresAt: number;
+}
+
+export interface CreateKioskRequest {
+  name: string;
+  location: string;
+}
+
+export interface CreateKioskResponse {
+  kiosk: Kiosk;
+  enrollmentToken: string;
+}
+
+export interface KioskDetailResponse {
+  kiosk: Kiosk;
+  layout: KioskLayout;
+  currentPin: string | null;
+}
+
+export interface KioskListResponse {
+  kiosks: Kiosk[];
+}
+
+export interface UpdateLayoutRequest {
+  layout: KioskLayout;
+}

packages/shared-types/src/channel.ts

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+import type { AnnotationEvent } from "./annotation.js";
+import type { ControlEvent } from "./control.js";
+import type { WhiteboardEvent } from "./whiteboard.js";
+
+export const DATA_TOPICS = ["annotation", "control", "whiteboard"] as const;
+
+export type DataTopic = (typeof DATA_TOPICS)[number];
+
+export const PROTOCOL_VERSION = 1;
+
+export interface TopicPayloadMap {
+  annotation: AnnotationEvent;
+  control: ControlEvent;
+  whiteboard: WhiteboardEvent;
+}
+
+export interface DataEnvelope<T extends DataTopic = DataTopic> {
+  version: number;
+  topic: T;
+  senderId: string;
+  sentAt: number;
+  payload: TopicPayloadMap[T];
+}
+
+export function encodeEnvelope<T extends DataTopic>(
+  topic: T,
+  senderId: string,
+  payload: TopicPayloadMap[T]
+): Uint8Array {
+  const envelope: DataEnvelope<T> = {
+    version: PROTOCOL_VERSION,
+    topic,
+    senderId,
+    sentAt: Date.now(),
+    payload
+  };
+  return new TextEncoder().encode(JSON.stringify(envelope));
+}
+
+export function decodeEnvelope(data: Uint8Array): DataEnvelope | null {
+  return parseEnvelope(new TextDecoder().decode(data));
+}
+
+export function parseEnvelope(json: string): DataEnvelope | null {
+  try {
+    const parsed = JSON.parse(json) as DataEnvelope;
+    if (parsed.version !== PROTOCOL_VERSION) return null;
+    if (!DATA_TOPICS.includes(parsed.topic)) return null;
+    return parsed;
+  } catch {
+    return null;
+  }
+}
+
+export function isTopic<T extends DataTopic>(
+  envelope: DataEnvelope,
+  topic: T
+): envelope is DataEnvelope<T> {
+  return envelope.topic === topic;
+}

packages/shared-types/src/control.ts

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+import type { RoomMode, RoomState } from "./room.js";
+
+export interface ModeSetEvent {
+  type: "mode.set";
+  mode: RoomMode;
+}
+
+export interface PresenterSetEvent {
+  type: "presenter.set";
+  presenterId: string | null;
+}
+
+export interface AnnotationLockEvent {
+  type: "annotation.lock";
+  locked: boolean;
+}
+
+export interface RoomStateEvent {
+  type: "room.state";
+  state: RoomState;
+}
+
+export interface RoomStateRequestEvent {
+  type: "room.state.request";
+}
+
+export type ControlEvent =
+  | ModeSetEvent
+  | PresenterSetEvent
+  | AnnotationLockEvent
+  | RoomStateEvent
+  | RoomStateRequestEvent;

packages/shared-types/src/ids.ts

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+let sequence = 0;
+
+export function createId(prefix: string): string {
+  sequence += 1;
+  const random = Math.random().toString(36).slice(2, 10);
+  return `${prefix}-${Date.now().toString(36)}-${sequence.toString(36)}-${random}`;
+}
+
+export function ensureUniqueIds<T>(
+  items: T[],
+  getId: (item: T) => string,
+  withId: (item: T, id: string) => T,
+  prefix: string
+): T[] {
+  const seen = new Set<string>();
+
+  return items.map((item) => {
+    const id = getId(item);
+    if (id && !seen.has(id)) {
+      seen.add(id);
+      return item;
+    }
+
+    const replacement = createId(prefix);
+    seen.add(replacement);
+    return withId(item, replacement);
+  });
+}

packages/shared-types/src/index.ts

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+export * from "./annotation.js";
+export * from "./api.js";
+export * from "./channel.js";
+export * from "./control.js";
+export * from "./ids.js";
+export * from "./kiosk.js";
+export * from "./layout-grid.js";
+export * from "./time-zone.js";
+export * from "./night.js";
+export * from "./organization.js";
+export * from "./room.js";
+export * from "./whiteboard.js";
+export * from "./widget.js";
+export * from "./widget-builder.js";

packages/shared-types/src/kiosk.ts

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+import type { NightModeSettings } from "./night.js";
+import type { CustomWidgetDefinition } from "./widget-builder.js";
+import type { Widget } from "./widget.js";
+
+export const KIOSK_STATUSES = ["online", "offline"] as const;
+
+export type KioskStatus = (typeof KIOSK_STATUSES)[number];
+
+export interface WifiMetrics {
+  interface: string;
+  linkQuality: number;
+  signalDbm: number;
+}
+
+export interface KioskMetrics {
+  cpuPercent: number | null;
+  memoryUsedBytes: number;
+  memoryTotalBytes: number;
+  uptimeSeconds: number;
+  temperatureCelsius: number | null;
+  wifi: WifiMetrics | null;
+}
+
+export interface Kiosk {
+  kioskId: string;
+  name: string;
+  location: string;
+  roomName: string;
+  status: KioskStatus;
+  lastSeenAt: number | null;
+  createdAt: number;
+  metrics: KioskMetrics | null;
+  metricsAt: number | null;
+}
+
+export function signalLabel(signalDbm: number): "excellent" | "good" | "weak" | "poor" {
+  if (signalDbm >= -55) return "excellent";
+  if (signalDbm >= -67) return "good";
+  if (signalDbm >= -75) return "weak";
+  return "poor";
+}
+
+/// Rough strength as a percentage. Wi-Fi signal is logarithmic and roughly spans -100 dBm
+/// for unusable to -50 dBm for excellent, which is the range this maps onto.
+export function signalPercent(signalDbm: number): number {
+  return Math.round(Math.min(100, Math.max(0, 2 * (signalDbm + 100))));
+}
+
+export function signalAdvice(signalDbm: number): string {
+  switch (signalLabel(signalDbm)) {
+    case "excellent":
+      return "Strong signal";
+    case "good":
+      return "Good signal";
+    case "weak":
+      return "Weak, video may stutter";
+    default:
+      return "Too weak, move the screen or the access point";
+  }
+}
+
+export function formatBytes(bytes: number): string {
+  if (bytes < 1024) return `${bytes} B`;
+  const units = ["KB", "MB", "GB", "TB"];
+  let value = bytes / 1024;
+  let unitIndex = 0;
+
+  while (value >= 1024 && unitIndex < units.length - 1) {
+    value /= 1024;
+    unitIndex += 1;
+  }
+
+  return `${value.toFixed(value >= 10 ? 0 : 1)} ${units[unitIndex]}`;
+}
+
+export function formatUptime(seconds: number): string {
+  const days = Math.floor(seconds / 86400);
+  const hours = Math.floor((seconds % 86400) / 3600);
+  const minutes = Math.floor((seconds % 3600) / 60);
+
+  if (days > 0) return `${days}d ${hours}h`;
+  if (hours > 0) return `${hours}h ${minutes}m`;
+  return `${minutes}m`;
+}
+
+export interface KioskBackground {
+  /// Retained so layouts saved before rotation existed still resolve. The server folds a
+  /// non empty value into `images` on load, so clients should read `images`.
+  imageUrl: string;
+  images: string[];
+  rotationSeconds: number;
+  fit: "cover" | "contain";
+  dim: number;
+}
+
+export const DEFAULT_BACKGROUND: KioskBackground = {
+  imageUrl: "",
+  images: [],
+  rotationSeconds: 60,
+  fit: "cover",
+  dim: 0.35
+};
+
+export const MIN_WALLPAPER_ROTATION_SECONDS = 5;
+
+export const DEFAULT_WIDGET_OPACITY = 0.5;
+
+export interface KioskLayout {
+  kioskId: string;
+  backgroundColor: string;
+  foregroundColor: string;
+  widgetOpacity: number;
+  background: KioskBackground;
+  nightMode: NightModeSettings;
+  widgets: Widget[];
+  customDefinitions: CustomWidgetDefinition[];
+  updatedAt: number;
+}
+
+export function resolveMediaUrl(baseUrl: string, url: string): string {
+  if (!url) return "";
+  if (/^(https?:|data:|blob:)/.test(url)) return url;
+  return `${baseUrl.replace(/\/$/, "")}${url.startsWith("/") ? url : `/${url}`}`;
+}
+
+export const PIN_LENGTH = 6;
+export const PIN_ROTATION_SECONDS = 45;
+export const PIN_GRACE_SECONDS = 15;
+
+export function isValidPin(pin: string): boolean {
+  return new RegExp(`^\\d{${PIN_LENGTH}}$`).test(pin);
+}
+
+export function formatPin(pin: string): string {
+  if (pin.length !== PIN_LENGTH) return pin;
+  return `${pin.slice(0, 3)} ${pin.slice(3)}`;
+}

packages/shared-types/src/layout-grid.ts

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+import type { Widget, WidgetPlacement } from "./widget.js";
+import { WIDGET_GRID_COLUMNS, WIDGET_GRID_ROWS } from "./widget.js";
+
+export type Occupancy = boolean[][];
+
+export function buildOccupancy(widgets: Widget[], ignoreWidgetId?: string): Occupancy {
+  const grid: Occupancy = Array.from({ length: WIDGET_GRID_ROWS }, () =>
+    Array.from({ length: WIDGET_GRID_COLUMNS }, () => false)
+  );
+
+  for (const widget of widgets) {
+    if (widget.widgetId === ignoreWidgetId) continue;
+
+    const { column, row, columnSpan, rowSpan } = widget.placement;
+    for (let y = row - 1; y < row - 1 + rowSpan; y += 1) {
+      for (let x = column - 1; x < column - 1 + columnSpan; x += 1) {
+        if (y >= 0 && y < WIDGET_GRID_ROWS && x >= 0 && x < WIDGET_GRID_COLUMNS) {
+          grid[y][x] = true;
+        }
+      }
+    }
+  }
+
+  return grid;
+}
+
+export function isWithinGrid(placement: WidgetPlacement): boolean {
+  return (
+    placement.column >= 1 &&
+    placement.row >= 1 &&
+    placement.columnSpan >= 1 &&
+    placement.rowSpan >= 1 &&
+    placement.column + placement.columnSpan - 1 <= WIDGET_GRID_COLUMNS &&
+    placement.row + placement.rowSpan - 1 <= WIDGET_GRID_ROWS
+  );
+}
+
+export function isAreaFree(occupancy: Occupancy, placement: WidgetPlacement): boolean {
+  if (!isWithinGrid(placement)) return false;
+
+  for (let y = placement.row - 1; y < placement.row - 1 + placement.rowSpan; y += 1) {
+    for (let x = placement.column - 1; x < placement.column - 1 + placement.columnSpan; x += 1) {
+      if (occupancy[y][x]) return false;
+    }
+  }
+
+  return true;
+}
+
+export function clampPlacement(placement: WidgetPlacement): WidgetPlacement {
+  const columnSpan = Math.min(Math.max(1, placement.columnSpan), WIDGET_GRID_COLUMNS);
+  const rowSpan = Math.min(Math.max(1, placement.rowSpan), WIDGET_GRID_ROWS);
+
+  return {
+    columnSpan,
+    rowSpan,
+    column: Math.min(Math.max(1, placement.column), WIDGET_GRID_COLUMNS - columnSpan + 1),
+    row: Math.min(Math.max(1, placement.row), WIDGET_GRID_ROWS - rowSpan + 1)
+  };
+}
+
+export function findFreePlacement(
+  widgets: Widget[],
+  columnSpan: number,
+  rowSpan: number
+): WidgetPlacement | null {
+  const occupancy = buildOccupancy(widgets);
+
+  for (const span of shrinkingSpans(columnSpan, rowSpan)) {
+    for (let row = 1; row <= WIDGET_GRID_ROWS - span.rowSpan + 1; row += 1) {
+      for (let column = 1; column <= WIDGET_GRID_COLUMNS - span.columnSpan + 1; column += 1) {
+        const candidate = { column, row, ...span };
+        if (isAreaFree(occupancy, candidate)) return candidate;
+      }
+    }
+  }
+
+  return null;
+}
+
+function shrinkingSpans(columnSpan: number, rowSpan: number) {
+  const spans: { columnSpan: number; rowSpan: number }[] = [];
+  let columns = Math.min(Math.max(1, columnSpan), WIDGET_GRID_COLUMNS);
+  let rows = Math.min(Math.max(1, rowSpan), WIDGET_GRID_ROWS);
+
+  while (columns >= 1 && rows >= 1) {
+    spans.push({ columnSpan: columns, rowSpan: rows });
+    if (columns === 1 && rows === 1) break;
+    if (columns >= rows) columns -= 1;
+    else rows -= 1;
+  }
+
+  return spans;
+}

packages/shared-types/src/night.ts

@@ -0,0 +1,73 @@
+export interface NightModeSettings {
+  enabled: boolean;
+  startTime: string;
+  endTime: string;
+  timeZone: string;
+  showPin: boolean;
+  brightness: number;
+}
+
+export const DEFAULT_NIGHT_MODE: NightModeSettings = {
+  enabled: false,
+  startTime: "22:00",
+  endTime: "06:30",
+  timeZone: "",
+  showPin: true,
+  brightness: 0.45
+};
+
+export function parseTimeOfDay(value: string): number | null {
+  const match = /^(\d{1,2}):(\d{2})$/.exec(value.trim());
+  if (!match) return null;
+
+  const hours = Number(match[1]);
+  const minutes = Number(match[2]);
+  if (hours > 23 || minutes > 59) return null;
+
+  return hours * 60 + minutes;
+}
+
+export function formatTimeOfDay(minutesOfDay: number): string {
+  const normalized = ((minutesOfDay % 1440) + 1440) % 1440;
+  const hours = Math.floor(normalized / 60);
+  const minutes = normalized % 60;
+  return `${String(hours).padStart(2, "0")}:${String(minutes).padStart(2, "0")}`;
+}
+
+export function minutesOfDayIn(timeZone: string, now: Date): number {
+  if (!timeZone) return now.getHours() * 60 + now.getMinutes();
+
+  try {
+    const parts = new Intl.DateTimeFormat("en-GB", {
+      timeZone,
+      hour: "2-digit",
+      minute: "2-digit",
+      hourCycle: "h23"
+    }).formatToParts(now);
+
+    const hours = Number(parts.find((part) => part.type === "hour")?.value ?? "0");
+    const minutes = Number(parts.find((part) => part.type === "minute")?.value ?? "0");
+    return hours * 60 + minutes;
+  } catch {
+    return now.getHours() * 60 + now.getMinutes();
+  }
+}
+
+export function isNightModeActive(
+  settings: NightModeSettings,
+  now: Date = new Date()
+): boolean {
+  if (!settings.enabled) return false;
+
+  const start = parseTimeOfDay(settings.startTime);
+  const end = parseTimeOfDay(settings.endTime);
+  if (start === null || end === null || start === end) return false;
+
+  const current = minutesOfDayIn(settings.timeZone, now);
+
+  if (start < end) {
+    return current >= start && current < end;
+  }
+
+  return current >= start || current < end;
+}

packages/shared-types/src/organization.ts

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+export interface BrandLink {
+  linkId: string;
+  label: string;
+  url: string;
+}
+
+export const LANDING_MODES = ["full", "join"] as const;
+
+export type LandingMode = (typeof LANDING_MODES)[number];
+
+export interface BrandTheme {
+  surface0: string;
+  surface1: string;
+  surface2: string;
+  surface3: string;
+  ink0: string;
+  ink1: string;
+  ink2: string;
+}
+
+export const DEFAULT_THEME: BrandTheme = {
+  surface0: "#0b0d10",
+  surface1: "#14181d",
+  surface2: "#1c2229",
+  surface3: "#262e37",
+  ink0: "#f4f6f8",
+  ink1: "#a8b3c0",
+  ink2: "#6b7885"
+};
+
+export interface OrganizationBranding {
+  name: string;
+  headline: string;
+  description: string;
+  logoUrl: string;
+  accentColor: string;
+  joinLabel: string;
+  footerNote: string;
+  showSourceLink: boolean;
+  landingMode: LandingMode;
+  theme: BrandTheme;
+  links: BrandLink[];
+  updatedAt: number;
+}
+
+/// Inline style declaring the palette as custom properties, so every Tailwind utility
+/// built on these tokens picks up the organisation's colours without touching components.
+export function themeStyle(branding: OrganizationBranding): string {
+  const theme = { ...DEFAULT_THEME, ...(branding.theme ?? {}) };
+
+  return [
+    `--color-surface-0: ${theme.surface0}`,
+    `--color-surface-1: ${theme.surface1}`,
+    `--color-surface-2: ${theme.surface2}`,
+    `--color-surface-3: ${theme.surface3}`,
+    `--color-ink-0: ${theme.ink0}`,
+    `--color-ink-1: ${theme.ink1}`,
+    `--color-ink-2: ${theme.ink2}`,
+    `--color-accent: ${branding.accentColor}`,
+    `--color-accent-strong: ${branding.accentColor}`,
+    `background-color: ${theme.surface0}`,
+    `color: ${theme.ink0}`
+  ].join("; ");
+}
+
+export const DEFAULT_BRANDING: OrganizationBranding = {
+  name: "PiStation",
+  headline: "Any screen becomes a shared screen.",
+  description:
+    "Type the code shown on screen to present, draw on what is being shown, or open a " +
+    "whiteboard together. No accounts, no installs, and nothing leaves the network it runs on.",
+  logoUrl: "",
+  accentColor: "#4f7cff",
+  joinLabel: "Enter the code on screen",
+  footerNote: "",
+  showSourceLink: true,
+  landingMode: "full",
+  theme: DEFAULT_THEME,
+  links: [],
+  updatedAt: 0
+};
+
+export function withBrandingDefaults(
+  branding: Partial<OrganizationBranding> | null | undefined
+): OrganizationBranding {
+  if (!branding) return { ...DEFAULT_BRANDING, theme: { ...DEFAULT_THEME } };
+
+  return {
+    ...DEFAULT_BRANDING,
+    ...branding,
+    theme: { ...DEFAULT_THEME, ...(branding.theme ?? {}) },
+    links: branding.links ?? []
+  };
+}

packages/shared-types/src/room.ts

@@ -0,0 +1,29 @@
+export const ROOM_MODES = ["idle", "presentation", "whiteboard"] as const;
+
+export type RoomMode = (typeof ROOM_MODES)[number];
+
+export const PARTICIPANT_ROLES = ["kiosk", "presenter", "viewer", "admin"] as const;
+
+export type ParticipantRole = (typeof PARTICIPANT_ROLES)[number];
+
+export interface ParticipantIdentity {
+  participantId: string;
+  displayName: string;
+  role: ParticipantRole;
+}
+
+export interface RoomState {
+  roomName: string;
+  mode: RoomMode;
+  presenterId: string | null;
+  annotationsLocked: boolean;
+  updatedAt: number;
+}
+
+export function canPublishScreen(role: ParticipantRole): boolean {
+  return role === "presenter" || role === "admin";
+}
+
+export function canChangeMode(role: ParticipantRole): boolean {
+  return role === "presenter" || role === "admin";
+}

packages/shared-types/src/time-zone.ts

@@ -0,0 +1,86 @@
+const validationCache = new Map<string, boolean>();
+
+export function isValidTimeZone(timeZone: string): boolean {
+  if (!timeZone) return false;
+
+  const cached = validationCache.get(timeZone);
+  if (cached !== undefined) return cached;
+
+  let valid = true;
+  try {
+    new Intl.DateTimeFormat("en-GB", { timeZone }).format(new Date());
+  } catch {
+    valid = false;
+  }
+
+  validationCache.set(timeZone, valid);
+  return valid;
+}
+
+export function safeTimeZone(timeZone: string): string | undefined {
+  return isValidTimeZone(timeZone) ? timeZone : undefined;
+}
+
+export function localTimeZone(): string {
+  try {
+    return Intl.DateTimeFormat().resolvedOptions().timeZone ?? "UTC";
+  } catch {
+    return "UTC";
+  }
+}
+
+export function listTimeZones(): string[] {
+  const supported = (
+    Intl as unknown as { supportedValuesOf?: (key: string) => string[] }
+  ).supportedValuesOf;
+
+  if (typeof supported === "function") {
+    try {
+      return supported.call(Intl, "timeZone");
+    } catch {
+      return COMMON_TIME_ZONES;
+    }
+  }
+
+  return COMMON_TIME_ZONES;
+}
+
+export const COMMON_TIME_ZONES = [
+  "UTC",
+  "America/New_York",
+  "America/Chicago",
+  "America/Denver",
+  "America/Phoenix",
+  "America/Los_Angeles",
+  "America/Anchorage",
+  "Pacific/Honolulu",
+  "America/Toronto",
+  "America/Mexico_City",
+  "America/Sao_Paulo",
+  "Europe/London",
+  "Europe/Dublin",
+  "Europe/Paris",
+  "Europe/Berlin",
+  "Europe/Madrid",
+  "Europe/Rome",
+  "Europe/Amsterdam",
+  "Europe/Stockholm",
+  "Europe/Warsaw",
+  "Europe/Athens",
+  "Europe/Moscow",
+  "Africa/Cairo",
+  "Africa/Lagos",
+  "Africa/Johannesburg",
+  "Asia/Dubai",
+  "Asia/Karachi",
+  "Asia/Kolkata",
+  "Asia/Bangkok",
+  "Asia/Shanghai",
+  "Asia/Hong_Kong",
+  "Asia/Singapore",
+  "Asia/Tokyo",
+  "Asia/Seoul",
+  "Australia/Perth",
+  "Australia/Sydney",
+  "Pacific/Auckland"
+];

packages/shared-types/src/whiteboard.ts

@@ -0,0 +1,56 @@
+export interface WhiteboardElement {
+  id: string;
+  version: number;
+  versionNonce: number;
+  isDeleted?: boolean;
+  [key: string]: unknown;
+}
+
+export interface WhiteboardPatchEvent {
+  type: "whiteboard.patch";
+  elements: WhiteboardElement[];
+}
+
+export interface WhiteboardSnapshotEvent {
+  type: "whiteboard.snapshot";
+  elements: WhiteboardElement[];
+  backgroundColor: string;
+}
+
+export interface WhiteboardRequestEvent {
+  type: "whiteboard.request";
+}
+
+export interface WhiteboardClearEvent {
+  type: "whiteboard.clear";
+}
+
+export type WhiteboardEvent =
+  | WhiteboardPatchEvent
+  | WhiteboardSnapshotEvent
+  | WhiteboardRequestEvent
+  | WhiteboardClearEvent;
+
+export function mergeWhiteboardElements(
+  current: WhiteboardElement[],
+  incoming: WhiteboardElement[]
+): WhiteboardElement[] {
+  const byId = new Map<string, WhiteboardElement>();
+  for (const element of current) {
+    byId.set(element.id, element);
+  }
+  for (const element of incoming) {
+    const existing = byId.get(element.id);
+    if (!existing || isNewerElement(element, existing)) {
+      byId.set(element.id, element);
+    }
+  }
+  return [...byId.values()];
+}
+
+function isNewerElement(candidate: WhiteboardElement, existing: WhiteboardElement): boolean {
+  if (candidate.version !== existing.version) {
+    return candidate.version > existing.version;
+  }
+  return candidate.versionNonce < existing.versionNonce;
+}

packages/shared-types/src/widget-builder.ts

@@ -0,0 +1,105 @@
+export const WIDGET_BLOCK_KINDS = ["heading", "text", "metric", "list", "image", "divider"] as const;
+
+export type WidgetBlockKind = (typeof WIDGET_BLOCK_KINDS)[number];
+
+export interface HeadingBlock {
+  blockId: string;
+  kind: "heading";
+  template: string;
+}
+
+export interface TextBlock {
+  blockId: string;
+  kind: "text";
+  template: string;
+}
+
+export interface MetricBlock {
+  blockId: string;
+  kind: "metric";
+  labelTemplate: string;
+  valueTemplate: string;
+  unit: string;
+}
+
+export interface ListBlock {
+  blockId: string;
+  kind: "list";
+  sourcePath: string;
+  itemTemplate: string;
+  maxItems: number;
+}
+
+export interface ImageBlock {
+  blockId: string;
+  kind: "image";
+  urlTemplate: string;
+  fit: "cover" | "contain";
+}
+
+export interface DividerBlock {
+  blockId: string;
+  kind: "divider";
+}
+
+export type WidgetBlock =
+  | HeadingBlock
+  | TextBlock
+  | MetricBlock
+  | ListBlock
+  | ImageBlock
+  | DividerBlock;
+
+export interface WidgetDataSource {
+  url: string;
+  refreshSeconds: number;
+  rootPath: string;
+}
+
+export interface CustomWidgetDefinition {
+  definitionId: string;
+  name: string;
+  blocks: WidgetBlock[];
+  dataSource: WidgetDataSource | null;
+  accentColor: string;
+  updatedAt: number;
+}
+
+const TEMPLATE_TOKEN = /\{\{\s*([^}]+?)\s*\}\}/g;
+
+export function resolvePath(source: unknown, path: string): unknown {
+  if (!path) return source;
+  let current: unknown = source;
+  for (const segment of path.split(".")) {
+    if (current === null || current === undefined) return undefined;
+    const index = Number(segment);
+    if (Array.isArray(current) && Number.isInteger(index)) {
+      current = current[index];
+    } else if (typeof current === "object") {
+      current = (current as Record<string, unknown>)[segment];
+    } else {
+      return undefined;
+    }
+  }
+  return current;
+}
+
+export function renderTemplate(template: string, data: unknown): string {
+  return template.replace(TEMPLATE_TOKEN, (_match, path: string) => {
+    const value = resolvePath(data, path);
+    if (value === null || value === undefined) return "";
+    if (typeof value === "object") return JSON.stringify(value);
+    return String(value);
+  });
+}
+
+export function createEmptyDefinition(definitionId: string): CustomWidgetDefinition {
+  return {
+    definitionId,
+    name: "Untitled widget",
+    blocks: [],
+    dataSource: null,
+    accentColor: "#4f7cff",
+    updatedAt: Date.now()
+  };
+}

packages/shared-types/src/widget.ts

@@ -0,0 +1,158 @@
+export const BUILTIN_WIDGET_KINDS = [
+  "clock",
+  "weather",
+  "pin",
+  "text",
+  "image",
+  "agenda",
+  "custom"
+] as const;
+
+export type WidgetKind = (typeof BUILTIN_WIDGET_KINDS)[number];
+
+export const WIDGET_GRID_COLUMNS = 12;
+export const WIDGET_GRID_ROWS = 8;
+
+export interface WidgetPlacement {
+  column: number;
+  row: number;
+  columnSpan: number;
+  rowSpan: number;
+}
+
+export interface ClockSettings {
+  timeZone: string;
+  showSeconds: boolean;
+  showDate: boolean;
+  hour12: boolean;
+}
+
+export interface WeatherSettings {
+  latitude: number;
+  longitude: number;
+  locationLabel: string;
+  units: "metric" | "imperial";
+}
+
+export interface PinSettings {
+  label: string;
+  showJoinUrl: boolean;
+}
+
+export interface TextSettings {
+  heading: string;
+  body: string;
+}
+
+export interface ImageSettings {
+  imageUrl: string;
+  fit: "cover" | "contain";
+}
+
+export interface AgendaSettings {
+  heading: string;
+  items: string[];
+}
+
+export interface CustomSettings {
+  definitionId: string;
+}
+
+export interface WidgetSettingsMap {
+  clock: ClockSettings;
+  weather: WeatherSettings;
+  pin: PinSettings;
+  text: TextSettings;
+  image: ImageSettings;
+  agenda: AgendaSettings;
+  custom: CustomSettings;
+}
+
+export const WIDGET_ALIGNMENTS = ["start", "center", "end"] as const;
+
+export type WidgetAlign = (typeof WIDGET_ALIGNMENTS)[number];
+
+export interface WidgetStyle {
+  padding: number;
+  align: WidgetAlign;
+  verticalAlign: WidgetAlign;
+  backgroundColor: string;
+  opacity: number | null;
+}
+
+export const DEFAULT_WIDGET_STYLE: WidgetStyle = {
+  padding: 5,
+  align: "start",
+  verticalAlign: "center",
+  backgroundColor: "",
+  opacity: null
+};
+
+function styleFor(overrides: Partial<WidgetStyle>): WidgetStyle {
+  return { ...DEFAULT_WIDGET_STYLE, ...overrides };
+}
+
+export const DEFAULT_WIDGET_STYLES: Record<WidgetKind, WidgetStyle> = {
+  clock: styleFor({}),
+  weather: styleFor({}),
+  pin: styleFor({ align: "center" }),
+  text: styleFor({}),
+  image: styleFor({ padding: 0, align: "center", opacity: 0 }),
+  agenda: styleFor({}),
+  custom: styleFor({})
+};
+
+export function toCssColor(hexColor: string, opacity: number): string {
+  const normalized = hexColor.replace("#", "");
+  if (normalized.length !== 3 && normalized.length !== 6) {
+    return `rgb(255 255 255 / ${opacity})`;
+  }
+
+  const expanded =
+    normalized.length === 3
+      ? normalized
+          .split("")
+          .map((character) => character + character)
+          .join("")
+      : normalized;
+
+  const red = Number.parseInt(expanded.slice(0, 2), 16);
+  const green = Number.parseInt(expanded.slice(2, 4), 16);
+  const blue = Number.parseInt(expanded.slice(4, 6), 16);
+
+  return `rgb(${red} ${green} ${blue} / ${opacity})`;
+}
+
+export function toFlexAlign(align: WidgetAlign): string {
+  if (align === "center") return "center";
+  return align === "end" ? "flex-end" : "flex-start";
+}
+
+export function toTextAlign(align: WidgetAlign): string {
+  if (align === "center") return "center";
+  return align === "end" ? "right" : "left";
+}
+
+export interface Widget<K extends WidgetKind = WidgetKind> {
+  widgetId: string;
+  kind: K;
+  placement: WidgetPlacement;
+  settings: WidgetSettingsMap[K];
+  style: WidgetStyle;
+  enabled: boolean;
+}
+
+export const DEFAULT_WIDGET_SETTINGS: WidgetSettingsMap = {
+  clock: { timeZone: "UTC", showSeconds: false, showDate: true, hour12: true },
+  weather: {
+    latitude: 38.8304,
+    longitude: -77.3078,
+    locationLabel: "Fairfax",
+    units: "imperial"
+  },
+  pin: { label: "Join at", showJoinUrl: true },
+  text: { heading: "", body: "" },
+  image: { imageUrl: "", fit: "cover" },
+  agenda: { heading: "Agenda", items: [] },
+  custom: { definitionId: "" }
+};

packages/shared-types/tsconfig.json

@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "declaration": true,
+    "noEmit": true,
+    "skipLibCheck": true,
+    "verbatimModuleSyntax": true
+  },
+  "include": ["src/**/*.ts"]
+}