fix: add missing import (#842)

Author: graphieros

app/composables/useCharts.ts

@@ -1,5 +1,6 @@
 import type { MaybeRefOrGetter } from 'vue'
 import { toValue } from 'vue'
+import { fetchNpmDownloadsRange } from '~/utils/npm/api'
 
 export type PackumentLikeForTime = {
   time?: Record<string, string>
@@ -45,12 +46,6 @@ export type PackageDownloadEvolutionOptions =
 
 type DailyDownloadsResponse = { downloads: Array<{ day: string; downloads: number }> }
 
-declare function fetchNpmDownloadsRange(
-  packageName: string,
-  startIso: string,
-  endIso: string,
-): Promise<DailyDownloadsResponse>
-
 function toIsoDateString(date: Date): string {
   return date.toISOString().slice(0, 10)
 }