Environment API

isBrowser Runtime

Checks for browser window and document capabilities.

Signature

export function isBrowser(): boolean;

Example

import { isBrowser } from "@fast-china/utils";

const result = isBrowser();

Input

This method has no input parameters.

Returns

Value	Type	Description
result	boolean	true when both exist; does not inspect DOM content.

isWebWorker Runtime

Checks for a worker-like runtime that is not a Window.

Signature

export function isWebWorker(): boolean;

Example

import { isWebWorker } from "@fast-china/utils";

const result = isWebWorker();

Input

This method has no input parameters.

Returns

Value	Type	Description
result	boolean	true when importScripts exists and the runtime is not a browser Window.

isNode Runtime

Checks for the Node.js version marker.

Signature

export function isNode(): boolean;

Example

import { isNode } from "@fast-china/utils";

const result = isNode();

Input

This method has no input parameters.

Returns

Value	Type	Description
result	boolean	true when process.versions.node is a string.

isUniApp Runtime

Checks for the uni-app uni runtime object.

Signature

export function isUniApp(): boolean;

Example

import { isUniApp } from "@fast-china/utils";

const result = isUniApp();

Input

This method has no input parameters.

Returns

Value	Type	Description
result	boolean	true when the uni identifier or compatible global property exists; calls no platform APIs.

hasWebCrypto Capability

Checks for Web Crypto capabilities required by this library's full cryptography API.

Signature

export function hasWebCrypto(): boolean;

Example

import { hasWebCrypto } from "@fast-china/utils";

const result = hasWebCrypto();

Input

This method has no input parameters.

Returns

Value	Type	Description
result	boolean	true when all required Web Crypto methods are available.

detectRuntime Runtime

Returns the primary runtime environment.

Signature

export function detectRuntime(): RuntimeKind;

Example

import { detectRuntime } from "@fast-china/utils";

const result = detectRuntime();

Input

This method has no input parameters.

Returns

Value	Type	Description
result	RuntimeKind	browser, worker, node, or unknown when unidentified.

isMobileUserAgent Mobile

Heuristically identifies phones from the User-Agent.

Signature

export function isMobileUserAgent(userAgent: string = currentUserAgent()): boolean;

Example

import { isMobileUserAgent } from "@fast-china/utils";

const result = isMobileUserAgent("Mozilla/5.0 (iPhone; Mobile)");

Input

Input	Type	Required / default	Description
userAgent	string	Optional; defaults to currentUserAgent()	Reads navigator.userAgent by default; uses an empty string when unavailable.

Returns

Value	Type	Description
result	boolean	true when phone characteristics match.

isTabletUserAgent Mobile

Heuristically identifies tablets using User-Agent and touch-point count.

Signature

export function isTabletUserAgent(userAgent: string = currentUserAgent(), maxTouchPoints: number = currentTouchPoints()): boolean;

Example

import { isTabletUserAgent } from "@fast-china/utils";

const result = isTabletUserAgent("Mozilla/5.0 (iPad)", 5);

Input

Input	Type	Required / default	Description
userAgent	string	Optional; defaults to currentUserAgent()	Current User-Agent by default.
maxTouchPoints	number	Optional; defaults to currentTouchPoints()	Identifies iPadOS with a desktop User-Agent; defaults to the current touch-point count.

Returns

Value	Type	Description
result	boolean	true when tablet characteristics match.