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/* @flow */
export const isJS = (file: string): boolean => /\.js(\?[^.]+)?$/.test(file)
export const isCSS = (file: string): boolean => /\.css(\?[^.]+)?$/.test(file)
export function createPromiseCallback () {
let resolve, reject
const promise: Promise<string> = new Promise((_resolve, _reject) => {
resolve = _resolve
reject = _reject
})
const cb = (err: Error, res?: string) => {
if (err) return reject(err)
resolve(res || '')
}
return { promise, cb }
}
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