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import { watch } from 'fs'
import { access, constants } from 'fs/promises'
import { dirname } from 'path'
export async function waitForFile(
path: string,
timeout: number
): Promise<void> {
let currentAction = ''
let timeoutRef
const timeoutPromise = new Promise<void>((resolve, reject) => {
timeoutRef = setTimeout(() => {
reject(
new Error(`Timed out waiting for file ${path} (${currentAction}))`)
)
}, timeout || 60000)
})
const elements: string[] = []
let current = path
while (true) {
elements.push(current)
const parent = dirname(current)
if (parent === current) {
break
}
current = parent
}
elements.reverse()
try {
for (const path of elements) {
const checkAccess = () =>
access(path, constants.F_OK)
.then(() => true)
.catch(() => false)
if (!(await checkAccess())) {
let resolveCheckAgain = () => {}
const watcher = watch(dirname(path), () => {
resolveCheckAgain()
})
currentAction = `waiting for ${path}`
let checkAgainPromise = new Promise<void>((resolve) => {
resolveCheckAgain = resolve
})
try {
do {
await Promise.race([timeoutPromise, checkAgainPromise])
// eslint-disable-next-line no-loop-func
checkAgainPromise = new Promise<void>((resolve) => {
resolveCheckAgain = resolve
})
} while (!(await checkAccess()))
} finally {
watcher.close()
}
}
}
} finally {
clearTimeout(timeoutRef)
}
}
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