Constnium/node_modules/eslint-plugin-n/lib/util/exists.js
2022-06-23 02:27:43 +02:00

58 lines
1.4 KiB
JavaScript

/**
* @author Toru Nagashima
* See LICENSE file in root directory for full license.
*/
"use strict"
const fs = require("fs")
const path = require("path")
const Cache = require("./cache")
const ROOT = /^(?:[/.]|\.\.|[A-Z]:\\|\\\\)(?:[/\\]\.\.)*$/u
const cache = new Cache()
/**
* Check whether the file exists or not.
* @param {string} filePath The file path to check.
* @returns {boolean} `true` if the file exists.
*/
function existsCaseSensitive(filePath) {
let dirPath = filePath
while (dirPath !== "" && !ROOT.test(dirPath)) {
const fileName = path.basename(dirPath)
dirPath = path.dirname(dirPath)
if (fs.readdirSync(dirPath).indexOf(fileName) === -1) {
return false
}
}
return true
}
/**
* Checks whether or not the file of a given path exists.
*
* @param {string} filePath - A file path to check.
* @returns {boolean} `true` if the file of a given path exists.
*/
module.exports = function exists(filePath) {
let result = cache.get(filePath)
if (result == null) {
try {
const relativePath = path.relative(process.cwd(), filePath)
result =
fs.statSync(relativePath).isFile() &&
existsCaseSensitive(relativePath)
} catch (error) {
if (error.code !== "ENOENT") {
throw error
}
result = false
}
cache.set(filePath, result)
}
return result
}