feat: init

node_modules/@vercel/nft/out/fs.js

@@ -0,0 +1,106 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.CachedFileSystem = void 0;
+const path_1 = require("path");
+const graceful_fs_1 = __importDefault(require("graceful-fs"));
+const async_sema_1 = require("async-sema");
+const fsReadFile = graceful_fs_1.default.promises.readFile;
+const fsReadlink = graceful_fs_1.default.promises.readlink;
+const fsStat = graceful_fs_1.default.promises.stat;
+class CachedFileSystem {
+    fileCache;
+    statCache;
+    symlinkCache;
+    fileIOQueue;
+    constructor({ cache, fileIOConcurrency, }) {
+        this.fileIOQueue = new async_sema_1.Sema(fileIOConcurrency);
+        this.fileCache = cache?.fileCache ?? new Map();
+        this.statCache = cache?.statCache ?? new Map();
+        this.symlinkCache = cache?.symlinkCache ?? new Map();
+        if (cache) {
+            cache.fileCache = this.fileCache;
+            cache.statCache = this.statCache;
+            cache.symlinkCache = this.symlinkCache;
+        }
+    }
+    async readlink(path) {
+        const cached = this.symlinkCache.get(path);
+        if (cached !== undefined)
+            return cached;
+        // This is not awaiting the response, so that the cache is instantly populated and
+        // future calls serve the Promise from the cache
+        const readlinkPromise = this.executeFileIO(path, this._internalReadlink);
+        this.symlinkCache.set(path, readlinkPromise);
+        return readlinkPromise;
+    }
+    async readFile(path) {
+        const cached = this.fileCache.get(path);
+        if (cached !== undefined)
+            return cached;
+        // This is not awaiting the response, so that the cache is instantly populated and
+        // future calls serve the Promise from the cache
+        const readFilePromise = this.executeFileIO(path, this._internalReadFile);
+        this.fileCache.set(path, readFilePromise);
+        return readFilePromise;
+    }
+    async stat(path) {
+        const cached = this.statCache.get(path);
+        if (cached !== undefined)
+            return cached;
+        // This is not awaiting the response, so that the cache is instantly populated and
+        // future calls serve the Promise from the cache
+        const statPromise = this.executeFileIO(path, this._internalStat);
+        this.statCache.set(path, statPromise);
+        return statPromise;
+    }
+    async _internalReadlink(path) {
+        try {
+            const link = await fsReadlink(path);
+            // also copy stat cache to symlink
+            const stats = this.statCache.get(path);
+            if (stats)
+                this.statCache.set((0, path_1.resolve)(path, link), stats);
+            return link;
+        }
+        catch (e) {
+            if (e.code !== 'EINVAL' && e.code !== 'ENOENT' && e.code !== 'UNKNOWN')
+                throw e;
+            return null;
+        }
+    }
+    async _internalReadFile(path) {
+        try {
+            return (await fsReadFile(path)).toString();
+        }
+        catch (e) {
+            if (e.code === 'ENOENT' || e.code === 'EISDIR') {
+                return null;
+            }
+            throw e;
+        }
+    }
+    async _internalStat(path) {
+        try {
+            return await fsStat(path);
+        }
+        catch (e) {
+            if (e.code === 'ENOENT') {
+                return null;
+            }
+            throw e;
+        }
+    }
+    async executeFileIO(path, fileIO) {
+        await this.fileIOQueue.acquire();
+        try {
+            return fileIO.call(this, path);
+        }
+        finally {
+            this.fileIOQueue.release();
+        }
+    }
+}
+exports.CachedFileSystem = CachedFileSystem;