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import type { ParsedUrlQuery } from 'querystring'
export function searchParamsToUrlQuery(
searchParams: URLSearchParams
): ParsedUrlQuery {
const query: ParsedUrlQuery = {}
for (const [key, value] of searchParams.entries()) {
const existing = query[key]
if (typeof existing === 'undefined') {
query[key] = value
} else if (Array.isArray(existing)) {
existing.push(value)
} else {
query[key] = [existing, value]
}
}
return query
}
function stringifyUrlQueryParam(param: unknown): string {
if (typeof param === 'string') {
return param
}
if (
(typeof param === 'number' && !isNaN(param)) ||
typeof param === 'boolean'
) {
return String(param)
} else {
return ''
}
}
export function urlQueryToSearchParams(query: ParsedUrlQuery): URLSearchParams {
const searchParams = new URLSearchParams()
for (const [key, value] of Object.entries(query)) {
if (Array.isArray(value)) {
for (const item of value) {
searchParams.append(key, stringifyUrlQueryParam(item))
}
} else {
searchParams.set(key, stringifyUrlQueryParam(value))
}
}
return searchParams
}
export function assign(
target: URLSearchParams,
...searchParamsList: URLSearchParams[]
): URLSearchParams {
for (const searchParams of searchParamsList) {
for (const key of searchParams.keys()) {
target.delete(key)
}
for (const [key, value] of searchParams.entries()) {
target.append(key, value)
}
}
return target
}
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