## API Report File for "@tldraw/utils"

> Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).

```ts

// @internal
export function annotateError(error: unknown, annotations: Partial<ErrorAnnotations>): void;

// @internal (undocumented)
export function areArraysShallowEqual<T>(arr1: readonly T[], arr2: readonly T[]): boolean;

// @internal (undocumented)
export function areObjectsShallowEqual<T extends Record<string, unknown>>(obj1: T, obj2: T): boolean;

// @internal (undocumented)
export const assert: (value: unknown, message?: string) => asserts value;

// @internal (undocumented)
export const assertExists: <T>(value: T, message?: string | undefined) => NonNullable<T>;

// @internal
export function clearLocalStorage(): void;

// @internal
export function clearSessionStorage(): void;

// @internal (undocumented)
export function compact<T>(arr: T[]): NonNullable<T>[];

// @public
export function debounce<T extends unknown[], U>(callback: (...args: T) => PromiseLike<U> | U, wait: number): {
    (...args: T): Promise<U>;
    cancel(): void;
};

// @public
export function dedupe<T>(input: T[], equals?: (a: any, b: any) => boolean): T[];

// @public (undocumented)
export const DEFAULT_SUPPORT_VIDEO_TYPES: readonly string[];

// @public (undocumented)
export const DEFAULT_SUPPORTED_IMAGE_TYPES: readonly string[];

// @public (undocumented)
export const DEFAULT_SUPPORTED_MEDIA_TYPE_LIST: string;

// @internal
export function deleteFromLocalStorage(key: string): void;

// @internal
export function deleteFromSessionStorage(key: string): void;

// @public (undocumented)
export interface ErrorResult<E> {
    // (undocumented)
    readonly error: E;
    // (undocumented)
    readonly ok: false;
}

// @internal (undocumented)
export function exhaustiveSwitchError(value: never, property?: string): never;

// @public (undocumented)
export type Expand<T> = T extends infer O ? {
    [K in keyof O]: O[K];
} : never;

// @public
export class FileHelpers {
    static blobToDataUrl(file: Blob): Promise<string>;
    static blobToText(file: Blob): Promise<string>;
    // (undocumented)
    static dataUrlToArrayBuffer(dataURL: string): Promise<ArrayBuffer>;
}

// @internal
export function filterEntries<Key extends string, Value>(object: {
    [K in Key]: Value;
}, predicate: (key: Key, value: Value) => boolean): {
    [K in Key]: Value;
};

// @internal
export function fpsThrottle(fn: () => void): () => void;

// @internal (undocumented)
export function getErrorAnnotations(error: Error): ErrorAnnotations;

// @public
export function getFirstFromIterable<T = unknown>(set: Map<any, T> | Set<T>): T;

// @internal
export function getFromLocalStorage(key: string): null | string;

// @internal
export function getFromSessionStorage(key: string): null | string;

// @public
export function getHashForBuffer(buffer: ArrayBuffer): string;

// @public
export function getHashForObject(obj: any): string;

// @public
export function getHashForString(string: string): string;

// @public
export function getIndexAbove(below?: IndexKey | undefined): IndexKey;

// @public
export function getIndexBelow(above?: IndexKey | undefined): IndexKey;

// @public
export function getIndexBetween(below: IndexKey | undefined, above: IndexKey | undefined): IndexKey;

// @public
export function getIndices(n: number, start?: IndexKey): IndexKey[];

// @public
export function getIndicesAbove(below: IndexKey | undefined, n: number): IndexKey[];

// @public
export function getIndicesBelow(above: IndexKey | undefined, n: number): IndexKey[];

// @public
export function getIndicesBetween(below: IndexKey | undefined, above: IndexKey | undefined, n: number): IndexKey[];

// @internal (undocumented)
export function getOwnProperty<K extends string, V>(obj: Partial<Record<K, V>>, key: K): undefined | V;

// @internal (undocumented)
export function getOwnProperty(obj: object, key: string): unknown;

// @internal (undocumented)
export function hasOwnProperty(obj: object, key: string): boolean;

// @public
export type IndexKey = string & {
    __orderKey: true;
};

// @public
export function invLerp(a: number, b: number, t: number): number;

// @public
export function isDefined<T>(value: T): value is typeof value extends undefined ? never : T;

// @internal (undocumented)
export const isNativeStructuredClone: boolean;

// @public
export function isNonNull<T>(value: T): value is typeof value extends null ? never : T;

// @public
export function isNonNullish<T>(value: T): value is typeof value extends undefined ? never : typeof value extends null ? never : T;

// @public (undocumented)
export type JsonArray = JsonValue[];

// @public (undocumented)
export interface JsonObject {
    // (undocumented)
    [key: string]: JsonValue | undefined;
}

// @public (undocumented)
export type JsonPrimitive = boolean | null | number | string;

// @public (undocumented)
export type JsonValue = JsonArray | JsonObject | JsonPrimitive;

// @internal (undocumented)
export function last<T>(arr: readonly T[]): T | undefined;

// @public
export function lerp(a: number, b: number, t: number): number;

// @public (undocumented)
export function lns(str: string): string;

// @internal
export function mapObjectMapValues<Key extends string, ValueBefore, ValueAfter>(object: {
    readonly [K in Key]: ValueBefore;
}, mapper: (key: Key, value: ValueBefore) => ValueAfter): {
    [K in Key]: ValueAfter;
};

// @internal (undocumented)
export function measureAverageDuration(_target: any, propertyKey: string, descriptor: PropertyDescriptor): PropertyDescriptor;

// @internal (undocumented)
export function measureCbDuration(name: string, cb: () => any): any;

// @internal (undocumented)
export function measureDuration(_target: any, propertyKey: string, descriptor: PropertyDescriptor): PropertyDescriptor;

// @public
export class MediaHelpers {
    static getImageSize(blob: Blob): Promise<{
        h: number;
        w: number;
    }>;
    static getVideoSize(blob: Blob): Promise<{
        h: number;
        w: number;
    }>;
    // (undocumented)
    static isAnimated(file: Blob): Promise<boolean>;
    // (undocumented)
    static isAnimatedImageType(mimeType: null | string): boolean;
    // (undocumented)
    static isImageType(mimeType: string): boolean;
    // (undocumented)
    static isStaticImageType(mimeType: null | string): boolean;
    static loadImage(src: string): Promise<HTMLImageElement>;
    static loadVideo(src: string): Promise<HTMLVideoElement>;
    // (undocumented)
    static usingObjectURL<T>(blob: Blob, fn: (url: string) => Promise<T>): Promise<T>;
}

// @internal (undocumented)
export function minBy<T>(arr: readonly T[], fn: (item: T) => number): T | undefined;

// @public
export function modulate(value: number, rangeA: number[], rangeB: number[], clamp?: boolean): number;

// @internal
export function noop(): void;

// @internal
export function objectMapEntries<Key extends string, Value>(object: {
    [K in Key]: Value;
}): Array<[Key, Value]>;

// @internal
export function objectMapFromEntries<Key extends string, Value>(entries: ReadonlyArray<readonly [Key, Value]>): {
    [K in Key]: Value;
};

// @internal
export function objectMapKeys<Key extends string>(object: {
    readonly [K in Key]: unknown;
}): Array<Key>;

// @internal
export function objectMapValues<Key extends string, Value>(object: {
    [K in Key]: Value;
}): Array<Value>;

// @public (undocumented)
export interface OkResult<T> {
    // (undocumented)
    readonly ok: true;
    // (undocumented)
    readonly value: T;
}

// @internal
export function omitFromStackTrace<Args extends Array<unknown>, Return>(fn: (...args: Args) => Return): (...args: Args) => Return;

// @internal
export function partition<T>(arr: T[], predicate: (item: T) => boolean): [T[], T[]];

// @public (undocumented)
export class PerformanceTracker {
    // (undocumented)
    isStarted(): boolean;
    // (undocumented)
    recordFrame: () => void;
    // (undocumented)
    start(name: string): void;
    // (undocumented)
    stop(): void;
}

// @public (undocumented)
export class PngHelpers {
    // (undocumented)
    static findChunk(view: DataView, type: string): {
        dataOffset: number;
        size: number;
        start: number;
    };
    // (undocumented)
    static getChunkType(view: DataView, offset: number): string;
    // (undocumented)
    static isPng(view: DataView, offset: number): boolean;
    // (undocumented)
    static parsePhys(view: DataView, offset: number): {
        ppux: number;
        ppuy: number;
        unit: number;
    };
    // (undocumented)
    static readChunks(view: DataView, offset?: number): Record<string, {
        dataOffset: number;
        size: number;
        start: number;
    }>;
    // (undocumented)
    static setPhysChunk(view: DataView, dpr?: number, options?: BlobPropertyBag): Blob;
}

// @internal (undocumented)
export function promiseWithResolve<T>(): Promise<T> & {
    reject: (reason?: any) => void;
    resolve: (value: T) => void;
};

// @public (undocumented)
export type RecursivePartial<T> = {
    [P in keyof T]?: RecursivePartial<T[P]>;
};

// @internal (undocumented)
type Required_2<T, K extends keyof T> = Expand<Omit<T, K> & _Required<Pick<T, K>>>;
export { Required_2 as Required }

// @public (undocumented)
export type Result<T, E> = ErrorResult<E> | OkResult<T>;

// @public (undocumented)
export const Result: {
    err<E>(error: E): ErrorResult<E>;
    ok<T>(value: T): OkResult<T>;
};

// @public
export function rng(seed?: string): () => number;

// @public
export function rotateArray<T>(arr: T[], offset: number): T[];

// @internal
export function setInLocalStorage(key: string, value: string): void;

// @internal
export function setInSessionStorage(key: string, value: string): void;

// @public (undocumented)
export function sortById<T extends {
    id: any;
}>(a: T, b: T): -1 | 1;

// @public
export function sortByIndex<T extends {
    index: IndexKey;
}>(a: T, b: T): -1 | 0 | 1;

// @internal
export const STRUCTURED_CLONE_OBJECT_PROTOTYPE: any;

// @public
const structuredClone_2: <T>(i: T) => T;
export { structuredClone_2 as structuredClone }

// @public
export function throttle<T extends (...args: any) => any>(func: T, limit: number): (...args: Parameters<T>) => ReturnType<T>;

// @internal
export function throttleToNextFrame(fn: () => void): () => void;

// @internal (undocumented)
export function validateIndexKey(key: string): asserts key is IndexKey;

// @internal (undocumented)
export function warnDeprecatedGetter(name: string): void;

// @public
export class WeakCache<K extends object, V> {
    get<P extends K>(item: P, cb: (item: P) => V): NonNullable<V>;
    items: WeakMap<K, V>;
}

// @public
export const ZERO_INDEX_KEY: IndexKey;

// (No @packageDocumentation comment for this package)

```