ags

home/ags/node_modules/eslint-plugin-n/lib/util/get-package-json.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 cache = new Cache()
+
+/**
+ * Reads the `package.json` data in a given path.
+ *
+ * Don't cache the data.
+ *
+ * @param {string} dir - The path to a directory to read.
+ * @returns {object|null} The read `package.json` data, or null.
+ */
+function readPackageJson(dir) {
+    const filePath = path.join(dir, "package.json")
+    try {
+        const text = fs.readFileSync(filePath, "utf8")
+        const data = JSON.parse(text)
+
+        if (typeof data === "object" && data !== null) {
+            data.filePath = filePath
+            return data
+        }
+    } catch (_err) {
+        // do nothing.
+    }
+
+    return null
+}
+
+/**
+ * Gets a `package.json` data.
+ * The data is cached if found, then it's used after.
+ *
+ * @param {string} [startPath] - A file path to lookup.
+ * @returns {object|null} A found `package.json` data or `null`.
+ *      This object have additional property `filePath`.
+ */
+module.exports = function getPackageJson(startPath = "a.js") {
+    const startDir = path.dirname(path.resolve(startPath))
+    let dir = startDir
+    let prevDir = ""
+    let data = null
+
+    do {
+        data = cache.get(dir)
+        if (data) {
+            if (dir !== startDir) {
+                cache.set(startDir, data)
+            }
+            return data
+        }
+
+        data = readPackageJson(dir)
+        if (data) {
+            cache.set(dir, data)
+            cache.set(startDir, data)
+            return data
+        }
+
+        // Go to next.
+        prevDir = dir
+        dir = path.resolve(dir, "..")
+    } while (dir !== prevDir)
+
+    cache.set(startDir, null)
+    return null
+}