ags

home/ags/node_modules/eslint-plugin-n/lib/util/exists.js

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+/**
+ * @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
+}