Utility Functions

/**
 * Get value at a property path on an object
 */
function get(object: any, path: string): any;

/**
 * Set value at a property path on an object
 */
function set(object: any, path: string, value: any): void;

/**
 * Check if a string represents a property path
 */
function isPath(path: string): boolean;

/**
 * Get root property name from a path
 */
function root(path: string): string;

/**
 * Check if a path is an ancestor of another path
 */
function isAncestor(base: string, path: string): boolean;

/**
 * Check if a path is a descendant of another path
 */
function isDescendant(base: string, path: string): boolean;

/**
 * Translate a path relative to another path
 */
function translate(base: string, newBase: string, path: string): string;

/**
 * Check if a path matches a pattern (supports wildcards)
 */
function matches(base: string, path: string): boolean;

/**
 * Normalize a property path
 */
function normalize(path: string): string;

/**
 * Split property path into array of path parts
 */
function split(path: string): string[];

import { get, set, isPath } from '@polymer/polymer/lib/utils/path.js';

const obj = {
  user: {
    profile: {
      name: 'Alice',
      settings: {
        theme: 'dark'
      }
    },
    posts: [
      { title: 'First Post', likes: 5 },
      { title: 'Second Post', likes: 10 }
    ]
  }
};

// Get values using paths
console.log(get(obj, 'user.profile.name')); // 'Alice'
console.log(get(obj, 'user.posts.0.title')); // 'First Post'

// Set values using paths
set(obj, 'user.profile.name', 'Bob');
set(obj, 'user.posts.1.likes', 15);

// Check if string is a path
console.log(isPath('user.name')); // true
console.log(isPath('simple')); // false

// Path manipulation
import { root, isAncestor, translate } from '@polymer/polymer/lib/utils/path.js';

console.log(root('user.profile.name')); // 'user'
console.log(isAncestor('user', 'user.profile.name')); // true
console.log(translate('old.path', 'new.path', 'old.path.prop')); // 'new.path.prop'

/**
 * Async interface for timeout-based operations
 */
interface AsyncInterface {
  /** Run function after delay */
  run(fn: () => void, delay?: number): number;
  
  /** Cancel scheduled function */
  cancel(handle: number): void;
}

/**
 * Timeout-based async interface
 */
const timeOut: AsyncInterface;

/**
 * Animation frame-based async interface
 */
const animationFrame: AsyncInterface;

/**
 * Idle period-based async interface
 */
const idlePeriod: AsyncInterface;

/**
 * Microtask-based async interface
 */
const microTask: AsyncInterface;

import { timeOut, animationFrame, microTask } from '@polymer/polymer/lib/utils/async.js';

// Timeout-based async
const timeoutHandle = timeOut.run(() => {
  console.log('Executed after 1000ms');
}, 1000);

// Cancel if needed
timeOut.cancel(timeoutHandle);

// Animation frame timing
const animationHandle = animationFrame.run(() => {
  console.log('Executed on next animation frame');
});

// Microtask timing
const microtaskHandle = microTask.run(() => {
  console.log('Executed on next microtask');
});

/**
 * Debouncer class for batching function calls
 */
class Debouncer {
  /** Create debouncer with async interface */
  constructor(asyncModule: AsyncInterface);
  
  /** Debounce a function call */
  debounce(fn: () => void): void;
  
  /** Cancel pending debounced call */
  cancel(): void;
  
  /** Immediately flush pending call */
  flush(): void;
  
  /** Check if debouncer is active */
  isActive(): boolean;
}

/**
 * Enqueue debouncer for automatic flushing
 */
function enqueueDebouncer(debouncer: Debouncer): void;

/**
 * Flush all enqueued debouncers
 */
function flushDebouncers(): void;

import { Debouncer, enqueueDebouncer, flushDebouncers } from '@polymer/polymer/lib/utils/debounce.js';
import { timeOut } from '@polymer/polymer/lib/utils/async.js';

class MyElement extends PolymerElement {
  constructor() {
    super();
    this._debouncer = null;
  }
  
  _debouncedMethod() {
    this._debouncer = Debouncer.debounce(
      this._debouncer,
      timeOut.after(100),
      () => {
        console.log('Debounced execution');
        this._actualWork();
      }
    );
    enqueueDebouncer(this._debouncer);
  }
  
  _actualWork() {
    // Heavy work that should be debounced
    console.log('Doing expensive operation');
  }
  
  // Call multiple times rapidly - only executes once
  rapidCalls() {
    this._debouncedMethod();
    this._debouncedMethod();
    this._debouncedMethod(); // Only the last call will execute after delay
  }
}

/**
 * Flush all pending Polymer operations
 */
function flush(): void;

import { flush } from '@polymer/polymer/lib/utils/flush.js';

// Force all pending property changes and template updates
flush();

// Useful in tests to ensure synchronous updates
element.someProperty = 'new value';
flush(); // Ensures all bindings are updated immediately

/**
 * Gesture recognizer registry
 */
interface GestureRecognizer {
  name: string;
  deps: string[];
  flow: {
    start: (e: Event, state: any) => void;
    move: (e: Event, state: any) => void;
    end: (e: Event, state: any) => void;
  };
  emits: string[];
}

/**
 * Gesture system interface
 */
interface Gestures {
  /** Array of registered recognizers */
  recognizers: GestureRecognizer[];
  
  /** Add gesture event listener */
  addListener(node: Node, evType: string, handler: (e: Event) => void): void;
  
  /** Remove gesture event listener */
  removeListener(node: Node, evType: string, handler: (e: Event) => void): void;
  
  /** Register gesture recognizer */
  register(recog: GestureRecognizer): void;
  
  /** Find deepest element at coordinates */
  deepTargetFind(x: number, y: number): Element;
  
  /** Set touch-action CSS property */
  setTouchAction(node: Node, value: string): void;
  
  /** Prevent gesture default behavior */
  prevent(evName: string): void;
  
  /** Reset mouse event cancellation */
  resetMouseCanceller(): void;
}

/**
 * Main gestures object
 */
const gestures: Gestures;

import { gestures } from '@polymer/polymer/lib/utils/gestures.js';

class GestureElement extends PolymerElement {
  ready() {
    super.ready();
    
    // Add gesture listeners
    gestures.addListener(this, 'tap', this._handleTap.bind(this));
    gestures.addListener(this, 'track', this._handleTrack.bind(this));
    
    // Prevent default touch behaviors
    gestures.setTouchAction(this, 'none');
  }
  
  _handleTap(e) {
    console.log('Tap at:', e.detail.x, e.detail.y);
  }
  
  _handleTrack(e) {
    switch (e.detail.state) {
      case 'start':
        console.log('Track started');
        break;
      case 'track':
        console.log('Tracking:', e.detail.dx, e.detail.dy);
        break;
      case 'end':
        console.log('Track ended');
        break;
    }
  }
}

/**
 * Convert dash-case to camelCase
 */
function dashToCamelCase(dash: string): string;

/**
 * Convert camelCase to dash-case
 */
function camelToDashCase(camel: string): string;

import { dashToCamelCase, camelToDashCase } from '@polymer/polymer/lib/utils/case-map.js';

console.log(dashToCamelCase('my-property')); // 'myProperty'
console.log(dashToCamelCase('data-binding-example')); // 'dataBindingExample'

console.log(camelToDashCase('myProperty')); // 'my-property'
console.log(camelToDashCase('dataBindingExample')); // 'data-binding-example'

/**
 * Calculate splice operations needed to transform one array to another
 */
function calculateSplices(current: any[], previous: any[]): Splice[];

interface Splice {
  index: number;
  removed: any[];
  addedCount: number;
  object: any[];
  type: 'splice';
}

/**
 * Observer for changes to flattened node tree
 */
class FlattenedNodesObserver {
  /** Create observer for a node */
  constructor(target: Node, callback: (info: FlattenedNodesInfo) => void);
  
  /** Start observing */
  connect(): void;
  
  /** Stop observing */
  disconnect(): void;
  
  /** Force synchronous update */
  flush(): void;
}

interface FlattenedNodesInfo {
  target: Node;
  addedNodes: Node[];
  removedNodes: Node[];
}

/**
 * Schedule callback before next render
 */
function beforeNextRender(element: Element, fn: () => void): void;

/**
 * Schedule callback after next render
 */
function afterNextRender(element: Element, fn: () => void): void;

import { beforeNextRender, afterNextRender } from '@polymer/polymer/lib/utils/render-status.js';

class RenderElement extends PolymerElement {
  ready() {
    super.ready();
    
    // Schedule work before next render
    beforeNextRender(this, () => {
      console.log('Before render - good for DOM measurements');
      const rect = this.getBoundingClientRect();
    });
    
    // Schedule work after next render
    afterNextRender(this, () => {
      console.log('After render - DOM is updated');
      this.focusFirstInput();
    });
  }
  
  focusFirstInput() {
    const input = this.shadowRoot.querySelector('input');
    if (input) input.focus();
  }
}

/**
 * Resolve relative URL against base URL
 */
function resolveUrl(url: string, base?: string): string;

/**
 * Resolve URLs in CSS text
 */
function resolveCss(cssText: string, baseUrl: string): string;

/**
 * Extract path from URL
 */
function pathFromUrl(url: string): string;

import { resolveUrl, resolveCss, pathFromUrl } from '@polymer/polymer/lib/utils/resolve-url.js';

// Resolve relative URLs
console.log(resolveUrl('image.png', 'https://example.com/assets/')); 
// 'https://example.com/assets/image.png'

// Resolve CSS URLs
const css = 'background: url(../images/bg.png);';
const resolved = resolveCss(css, 'https://example.com/styles/');
// 'background: url(https://example.com/images/bg.png);'

// Extract path from URL
console.log(pathFromUrl('https://example.com/path/to/file.js')); 
// 'https://example.com/path/to/'

/**
 * Set the root path for resolving URLs
 */
function setRootPath(path: string): void;

/**
 * Set DOM value sanitization function
 */
function setSanitizeDOMValue(fn: (value: any, name: string, type: string, node: Element) => any): void;

/**
 * Get current DOM value sanitization function
 */
function getSanitizeDOMValue(): (value: any, name: string, type: string, node: Element) => any;

/**
 * Enable/disable passive touch gesture handling
 */
function setPassiveTouchGestures(usePassive: boolean): void;

/**
 * Enable/disable strict template policy
 */
function setStrictTemplatePolicy(useStrictPolicy: boolean): void;

/**
 * Set whether templates can be created from dom-module
 */
function setAllowTemplateFromDomModule(allowDomModule: boolean): void;

/**
 * Enable/disable legacy optimizations
 */
function setLegacyOptimizations(useLegacyOptimizations: boolean): void;

/**
 * Enable/disable legacy warnings
 */
function setLegacyWarnings(useLegacyWarnings: boolean): void;

/**
 * Enable/disable synchronous initial render
 */
function setSyncInitialRender(useSyncInitialRender: boolean): void;

import { 
  setRootPath, 
  setSanitizeDOMValue, 
  setPassiveTouchGestures 
} from '@polymer/polymer/lib/utils/settings.js';

// Configure root path for URL resolution
setRootPath('/my-app/');

// Set up DOM sanitization
setSanitizeDOMValue((value, name, type, node) => {
  if (type === 'property' && name === 'innerHTML') {
    return sanitizeHTML(value); // Your sanitization logic
  }
  return value;
});

// Enable passive touch gestures for better scroll performance
setPassiveTouchGestures(true);

/**
 * Get styles from multiple modules
 */
function stylesFromModules(moduleIds: string[]): CSSResult[];

/**
 * Get styles from a single module
 */
function stylesFromModule(moduleId: string): CSSResult[];

/**
 * Get styles from a template element
 */
function stylesFromTemplate(template: HTMLTemplateElement, baseURI?: string): CSSResult[];

/**
 * Get CSS text from multiple modules
 */
function cssFromModules(moduleIds: string[]): string;

/**
 * Get CSS text from a single module
 */
function cssFromModule(moduleId: string): string;

/**
 * Get CSS text from a template element
 */
function cssFromTemplate(template: HTMLTemplateElement, baseURI?: string): string;

import { 
  stylesFromModules, 
  cssFromTemplate 
} from '@polymer/polymer/lib/utils/style-gather.js';

class StyledElement extends PolymerElement {
  static get template() {
    const template = html`
      <style include="shared-styles theme-styles">
        :host {
          display: block;
        }
      </style>
      <div>Styled content</div>
    `;
    
    // Process styles from included modules
    const moduleStyles = stylesFromModules(['shared-styles', 'theme-styles']);
    
    return template;
  }
}

/**
 * Wrap a node for ShadyDOM compatibility
 */
const wrap: <T extends Node>(node: T) => T;

import { wrap } from '@polymer/polymer/lib/utils/wrap.js';

// Wrap nodes when using ShadyDOM
const wrappedElement = wrap(someElement);
wrappedElement.appendChild(wrap(childNode));

/**
 * Array of all registered element constructors
 */
const registrations: PolymerElementConstructor[];

/**
 * Current instance count
 */
let instanceCount: number;

/**
 * Increment global instance count
 */
function incrementInstanceCount(): void;

/**
 * Register an element constructor
 */
function register(prototype: any): void;

/**
 * Dump registration information
 */
function dumpRegistrations(): void;

interface AsyncInterface {
  run(fn: () => void, delay?: number): number;
  cancel(handle: number): void;
}

interface GestureRecognizer {
  name: string;
  deps: string[];
  flow: {
    start: (e: Event, state: any) => void;
    move: (e: Event, state: any) => void;
    end: (e: Event, state: any) => void;
  };
  emits: string[];
}

interface Splice {
  index: number;
  removed: any[];
  addedCount: number;
  object: any[];
  type: 'splice';
}