"use strict";
/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
    __setModuleDefault(result, mod);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.createWebpackSystem = void 0;
const ts = __importStar(require("typescript"));
const paths_1 = require("./paths");
function shouldNotWrite() {
    throw new Error('Webpack TypeScript System should not write.');
}
function createWebpackSystem(input, currentDirectory) {
    // Webpack's CachedInputFileSystem uses the default directory separator in the paths it uses
    // for keys to its cache. If the keys do not match then the file watcher will not purge outdated
    // files and cause stale data to be used in the next rebuild. TypeScript always uses a `/` (POSIX)
    // directory separator internally which is also supported with Windows system APIs. However,
    // if file operations are performed with the non-default directory separator, the Webpack cache
    // will contain a key that will not be purged. `externalizePath` ensures the paths are as expected.
    const system = {
        ...ts.sys,
        readFile(path) {
            let data;
            try {
                data = input.readFileSync(paths_1.externalizePath(path));
            }
            catch {
                return undefined;
            }
            // Strip BOM if present
            let start = 0;
            if (data.length > 3 && data[0] === 0xef && data[1] === 0xbb && data[2] === 0xbf) {
                start = 3;
            }
            return data.toString('utf8', start);
        },
        getFileSize(path) {
            try {
                return input.statSync(paths_1.externalizePath(path)).size;
            }
            catch {
                return 0;
            }
        },
        fileExists(path) {
            try {
                return input.statSync(paths_1.externalizePath(path)).isFile();
            }
            catch {
                return false;
            }
        },
        directoryExists(path) {
            try {
                return input.statSync(paths_1.externalizePath(path)).isDirectory();
            }
            catch {
                return false;
            }
        },
        getModifiedTime(path) {
            try {
                return input.statSync(paths_1.externalizePath(path)).mtime;
            }
            catch {
                return undefined;
            }
        },
        getCurrentDirectory() {
            return currentDirectory;
        },
        writeFile: shouldNotWrite,
        createDirectory: shouldNotWrite,
        deleteFile: shouldNotWrite,
        setModifiedTime: shouldNotWrite,
    };
    return system;
}
exports.createWebpackSystem = createWebpackSystem;