vite-esbuild-typescript-checker/dist/esm/filesystem/real-file-system.js

* Speeds up [TypeScript](https://github.com/Microsoft/TypeScript) type checking * Supports [Vue Single File Component](https://vuejs.org/v2/guide/single-file-components.html) * Displays nice error messages with the [code frame](https://babeljs.io/docs/en/

import { dirname, basename, join, normalize } from 'path';
import fs from 'fs';
const existsCache = new Map();
const readStatsCache = new Map();
const readFileCache = new Map();
const readDirCache = new Map();
const realPathCache = new Map();
/**
 * It's an implementation of the FileSystem interface which reads and writes directly to the real file system.
 */ export const realFileSystem = {
    exists (path) {
        return exists(getRealPath(path));
    },
    readFile (path, encoding) {
        return readFile(getRealPath(path), encoding);
    },
    readDir (path) {
        return readDir(getRealPath(path));
    },
    readStats (path) {
        return readStats(getRealPath(path));
    },
    realPath (path) {
        return getRealPath(path);
    },
    normalizePath (path) {
        return normalize(path);
    },
    writeFile (path, data) {
        writeFile(getRealPath(path), data);
    },
    deleteFile (path) {
        deleteFile(getRealPath(path));
    },
    createDir (path) {
        createDir(getRealPath(path));
    },
    updateTimes (path, atime, mtime) {
        updateTimes(getRealPath(path), atime, mtime);
    },
    clearCache () {
        existsCache.clear();
        readStatsCache.clear();
        readFileCache.clear();
        readDirCache.clear();
        realPathCache.clear();
    }
};
// read methods
function exists(path) {
    const normalizedPath = normalize(path);
    if (!existsCache.has(normalizedPath)) {
        existsCache.set(normalizedPath, fs.existsSync(normalizedPath));
    }
    return !!existsCache.get(normalizedPath);
}
function readStats(path) {
    const normalizedPath = normalize(path);
    if (!readStatsCache.has(normalizedPath)) {
        if (exists(normalizedPath)) {
            readStatsCache.set(normalizedPath, fs.statSync(normalizedPath));
        }
    }
    return readStatsCache.get(normalizedPath);
}
function readFile(path, encoding) {
    const normalizedPath = normalize(path);
    if (!readFileCache.has(normalizedPath)) {
        const stats = readStats(normalizedPath);
        if (stats && stats.isFile()) {
            readFileCache.set(normalizedPath, fs.readFileSync(normalizedPath, {
                encoding: encoding
            }).toString());
        } else {
            readFileCache.set(normalizedPath, undefined);
        }
    }
    return readFileCache.get(normalizedPath);
}
function readDir(path) {
    const normalizedPath = normalize(path);
    if (!readDirCache.has(normalizedPath)) {
        const stats = readStats(normalizedPath);
        if (stats && stats.isDirectory()) {
            readDirCache.set(normalizedPath, fs.readdirSync(normalizedPath, {
                withFileTypes: true
            }));
        } else {
            readDirCache.set(normalizedPath, []);
        }
    }
    return readDirCache.get(normalizedPath) || [];
}
function getRealPath(path) {
    const normalizedPath = normalize(path);
    if (!realPathCache.has(normalizedPath)) {
        let base = normalizedPath;
        let nested = '';
        while(base !== dirname(base)){
            if (exists(base)) {
                realPathCache.set(normalizedPath, normalize(join(fs.realpathSync(base), nested)));
                break;
            }
            nested = join(basename(base), nested);
            base = dirname(base);
        }
    }
    return realPathCache.get(normalizedPath) || normalizedPath;
}
function createDir(path) {
    const normalizedPath = normalize(path);
    fs.mkdirSync(normalizedPath, {
        recursive: true
    });
    // update cache
    existsCache.set(normalizedPath, true);
    if (readDirCache.has(dirname(normalizedPath))) {
        readDirCache.delete(dirname(normalizedPath));
    }
    if (readStatsCache.has(normalizedPath)) {
        readStatsCache.delete(normalizedPath);
    }
}
function writeFile(path, data) {
    const normalizedPath = normalize(path);
    if (!exists(dirname(normalizedPath))) {
        createDir(dirname(normalizedPath));
    }
    fs.writeFileSync(normalizedPath, data);
    // update cache
    existsCache.set(normalizedPath, true);
    if (readDirCache.has(dirname(normalizedPath))) {
        readDirCache.delete(dirname(normalizedPath));
    }
    if (readStatsCache.has(normalizedPath)) {
        readStatsCache.delete(normalizedPath);
    }
    if (readFileCache.has(normalizedPath)) {
        readFileCache.delete(normalizedPath);
    }
}
function deleteFile(path) {
    if (exists(path)) {
        const normalizedPath = normalize(path);
        fs.unlinkSync(normalizedPath);
        // update cache
        existsCache.set(normalizedPath, false);
        if (readDirCache.has(dirname(normalizedPath))) {
            readDirCache.delete(dirname(normalizedPath));
        }
        if (readStatsCache.has(normalizedPath)) {
            readStatsCache.delete(normalizedPath);
        }
        if (readFileCache.has(normalizedPath)) {
            readFileCache.delete(normalizedPath);
        }
    }
}
function updateTimes(path, atime, mtime) {
    if (exists(path)) {
        const normalizedPath = normalize(path);
        fs.utimesSync(normalize(path), atime, mtime);
        // update cache
        if (readStatsCache.has(normalizedPath)) {
            readStatsCache.delete(normalizedPath);
        }
    }
}