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export const EMPTY_OBJ: { readonly [key: string]: any } = __DEV__
? Object.freeze({})
: {}
export const EMPTY_ARR: readonly never[] = __DEV__ ? Object.freeze([]) : []
export const NOOP = (): void => {}
/**
* Always return false.
*/
export const NO = () => false
export const isOn = (key: string): boolean =>
key.charCodeAt(0) === 111 /* o */ &&
key.charCodeAt(1) === 110 /* n */ &&
// uppercase letter
(key.charCodeAt(2) > 122 || key.charCodeAt(2) < 97)
export const isModelListener = (key: string): key is `onUpdate:${string}` =>
key.startsWith('onUpdate:')
export const extend: typeof Object.assign = Object.assign
export const remove = <T>(arr: T[], el: T): void => {
const i = arr.indexOf(el)
if (i > -1) {
arr.splice(i, 1)
}
}
const hasOwnProperty = Object.prototype.hasOwnProperty
export const hasOwn = (
val: object,
key: string | symbol,
): key is keyof typeof val => hasOwnProperty.call(val, key)
export const isArray: typeof Array.isArray = Array.isArray
export const isMap = (val: unknown): val is Map<any, any> =>
toTypeString(val) === '[object Map]'
export const isSet = (val: unknown): val is Set<any> =>
toTypeString(val) === '[object Set]'
export const isDate = (val: unknown): val is Date =>
toTypeString(val) === '[object Date]'
export const isRegExp = (val: unknown): val is RegExp =>
toTypeString(val) === '[object RegExp]'
export const isFunction = (val: unknown): val is Function =>
typeof val === 'function'
export const isString = (val: unknown): val is string => typeof val === 'string'
export const isSymbol = (val: unknown): val is symbol => typeof val === 'symbol'
export const isObject = (val: unknown): val is Record<any, any> =>
val !== null && typeof val === 'object'
export const isPromise = <T = any>(val: unknown): val is Promise<T> => {
return (
(isObject(val) || isFunction(val)) &&
isFunction((val as any).then) &&
isFunction((val as any).catch)
)
}
export const objectToString: typeof Object.prototype.toString =
Object.prototype.toString
export const toTypeString = (value: unknown): string =>
objectToString.call(value)
export const toRawType = (value: unknown): string => {
// extract "RawType" from strings like "[object RawType]"
return toTypeString(value).slice(8, -1)
}
export const isPlainObject = (val: unknown): val is object =>
toTypeString(val) === '[object Object]'
export const isIntegerKey = (key: unknown): boolean =>
isString(key) &&
key !== 'NaN' &&
key[0] !== '-' &&
'' + parseInt(key, 10) === key
export const isReservedProp: (key: string) => boolean = /*@__PURE__*/ makeMap(
// the leading comma is intentional so empty string "" is also included
',key,ref,ref_for,ref_key,' +
'onVnodeBeforeMount,onVnodeMounted,' +
'onVnodeBeforeUpdate,onVnodeUpdated,' +
'onVnodeBeforeUnmount,onVnodeUnmounted',
)
export const isBuiltInDirective: (key: string) => boolean =
/*@__PURE__*/ makeMap(
'bind,cloak,else-if,else,for,html,if,model,on,once,pre,show,slot,text,memo',
)
const cacheStringFunction = <T extends (str: string) => string>(fn: T): T => {
const cache: Record<string, string> = Object.create(null)
return ((str: string) => {
const hit = cache[str]
return hit || (cache[str] = fn(str))
}) as T
}
const camelizeRE = /-(\w)/g
/**
* @private
*/
export const camelize: (str: string) => string = cacheStringFunction(
(str: string): string => {
return str.replace(camelizeRE, (_, c) => (c ? c.toUpperCase() : ''))
},
)
const hyphenateRE = /\B([A-Z])/g
/**
* @private
*/
export const hyphenate: (str: string) => string = cacheStringFunction(
(str: string) => str.replace(hyphenateRE, '-$1').toLowerCase(),
)
/**
* @private
*/
export const capitalize: <T extends string>(str: T) => Capitalize<T> =
cacheStringFunction(<T extends string>(str: T) => {
return (str.charAt(0).toUpperCase() + str.slice(1)) as Capitalize<T>
})
/**
* @private
*/
export const toHandlerKey: <T extends string>(
str: T,
) => T extends '' ? '' : `on${Capitalize<T>}` = cacheStringFunction(
<T extends string>(str: T) => {
const s = str ? `on${capitalize(str)}` : ``
return s as T extends '' ? '' : `on${Capitalize<T>}`
},
)
// compare whether a value has changed, accounting for NaN.
export const hasChanged = (value: any, oldValue: any): boolean =>
!Object.is(value, oldValue)
export const invokeArrayFns = (fns: Function[], ...arg: any[]): void => {
for (let i = 0; i < fns.length; i++) {
fns[i](...arg)
}
}
export const def = (
obj: object,
key: string | symbol,
value: any,
writable = false,
): void => {
Object.defineProperty(obj, key, {
configurable: true,
enumerable: false,
writable,
value,
})
}
/**
* "123-foo" will be parsed to 123
* This is used for the .number modifier in v-model
*/
export const looseToNumber = (val: any): any => {
const n = parseFloat(val)
return isNaN(n) ? val : n
}
/**
* Only concerns number-like strings
* "123-foo" will be returned as-is
*/
export const toNumber = (val: any): any => {
const n = isString(val) ? Number(val) : NaN
return isNaN(n) ? val : n
}
// for typeof global checks without @types/node
declare var global: {}
let _globalThis: any
export const getGlobalThis = (): any => {
return (
_globalThis ||
(_globalThis =
typeof globalThis !== 'undefined'
? globalThis
: typeof self !== 'undefined'
? self
: typeof window !== 'undefined'
? window
: typeof global !== 'undefined'
? global
: {})
)
}
const identRE = /^[_$a-zA-Z\xA0-\uFFFF][_$a-zA-Z0-9\xA0-\uFFFF]*$/
export function genPropsAccessExp(name: string): string {
return identRE.test(name)
? `__props.${name}`
: `__props[${JSON.stringify(name)}]`
}
export function genCacheKey(source: string, options: any): string {
return (
source +
JSON.stringify(options, (_, val) =>
typeof val === 'function' ? val.toString() : val,
)
)
}
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