提交 | 用户 | age
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const toString = Object.prototype.toString; |
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export function is(val: unknown, type: string) { |
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return toString.call(val) === `[object ${type}]`; |
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} |
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export const isDef = <T = unknown>(val?: T): val is T => { |
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return typeof val !== 'undefined'; |
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}; |
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export const isUnDef = <T = unknown>(val?: T): val is T => { |
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return !isDef(val); |
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}; |
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export const isObject = (val: any): val is Record<any, any> => { |
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return val !== null && is(val, 'Object'); |
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}; |
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export function isDate(val: unknown): val is Date { |
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return is(val, 'Date'); |
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} |
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export function isNull(val: unknown): val is null { |
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return val === null; |
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} |
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export function isNumber(val: unknown): val is number { |
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return is(val, 'Number'); |
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} |
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export function isPromise<T = any>(val: unknown): val is Promise<T> { |
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return is(val, 'Promise') && isObject(val) && isFunction(val.then) && isFunction(val.catch); |
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} |
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export function isString(val: unknown): val is string { |
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return is(val, 'String'); |
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} |
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export const isFunction = (val: unknown): val is Function => typeof val === 'function'; |
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export function isBoolean(val: unknown): val is boolean { |
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return is(val, 'Boolean'); |
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} |
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export function isRegExp(val: unknown): val is RegExp { |
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return is(val, 'RegExp'); |
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} |
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export function isArray(val: unknown): val is Array<any> { |
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return val && Array.isArray(val); |
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} |
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export const isClient = () => { |
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return typeof window !== 'undefined'; |
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}; |
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export const isWindow = (val: any): val is Window => { |
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return typeof window !== 'undefined' && is(val, 'Window'); |
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}; |
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export const isElement = (val: unknown): val is Element => { |
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return isObject(val) && !!val.tagName; |
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}; |
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export const isServer = typeof window === 'undefined'; |
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export function isImageDom(o: Element) { |
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return o && ['IMAGE', 'IMG'].includes(o.tagName); |
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} |
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export const isTextarea = (element: Element | null): element is HTMLTextAreaElement => { |
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return element !== null && element.tagName.toLowerCase() === 'textarea'; |
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}; |