feat: add definition for memory-fs (#12377)

* feat: add definition for memory-fs

* fix: enable strictNullChecks and adjust tests

* feat: add standalone module definitions for memory-fs

memory-fs/index.d.ts

@@ -0,0 +1,83 @@
+// Type definitions for memory-fs 0.3.0
+// Project: https://github.com/webpack/memory-fs
+// Definitions by: e-cloud <https://github.com/e-cloud>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+declare class MemoryFileSystem {
+    data: any;
+
+    constructor(data?: any);
+
+    meta(_path: string): any;
+
+    existsSync(_path: string): boolean;
+
+    statSync(_path: string): {
+        isFile: () => boolean;
+        isDirectory: () => boolean;
+        isBlockDevice: () => boolean;
+        isCharacterDevice: () => boolean;
+        isSymbolicLink: () => boolean;
+        isFIFO: () => boolean;
+        isSocket: () => boolean;
+    };
+
+    readFileSync(_path: string, encoding?: string): any;
+
+    readdirSync(_path: string): string[];
+
+    mkdirpSync(_path: string): void;
+
+    mkdirSync(_path: string): void;
+
+    _remove(_path: string, name: string, testFn: ((part: string) => boolean)): void;
+
+    rmdirSync(_path: string): void;
+
+    unlinkSync(_path: string): void;
+
+    readlinkSync(_path: string): void;
+
+    writeFileSync(_path: string, content: string | Buffer, encoding?: string): void;
+
+    createReadStream(
+        path: string, options: {
+            start: number;
+            end: number;
+        }
+    ): any;
+
+    createWriteStream(path: string, options: any): any;
+
+    exists(path: string, callback: (isExist: boolean) => any): any;
+
+    writeFile(path: string, content: string | Buffer, callback: (err?: Error) => any): any;
+
+    writeFile(path: string, content: string | Buffer, encoding: string, callback: (err?: Error) => any): any;
+
+    join(path: string, request: string): string;
+
+    pathToArray(path: string): string[];
+
+    normalize(path: string): string;
+
+    stat(path: string, callback: (err?: Error, result?: any) => any): void;
+
+    readdir(path: string, callback: (err?: Error, result?: any) => any): void;
+
+    mkdirp(path: string, callback: (err?: Error, result?: any) => any): void;
+
+    rmdir(path: string, callback: (err?: Error, result?: any) => any): void;
+
+    unlink(path: string, callback: (err?: Error, result?: any) => any): void;
+
+    readlink(path: string, callback: (err?: Error, result?: any) => any): void;
+
+    mkdir(path: string, optArg: {}, callback: (err?: Error, result?: any) => any): void;
+
+    readFile(path: string, optArg: {}, callback: (err?: Error, result?: any) => any): void;
+}
+
+export = MemoryFileSystem;

memory-fs/lib/join-tests.ts

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+import memoryFsJoin = require('memory-fs/lib/join');
+
+memoryFsJoin('hello', 'world');

memory-fs/lib/join.d.ts

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+declare function join(path: string, request: string): string;
+
+export = join;

memory-fs/lib/normalize-tests.ts

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+import normalize = require('memory-fs/lib/normalize');
+
+normalize('hello world');

memory-fs/lib/normalize.d.ts

@@ -0,0 +1,3 @@
+declare function normalize(path: string): string;
+
+export = normalize;

memory-fs/memory-fs-tests.ts

@@ -0,0 +1,19 @@
+/// <reference path="./index.d.ts" />
+
+import MemoryFileSystem = require('memory-fs');
+
+const fs = new MemoryFileSystem({});
+
+fs.existsSync('./kd/sdkfj');
+
+fs.writeFile('hello', 'hahahahah', function (err) {
+    if(err){
+        console.log(err.message);
+    }
+});
+
+fs.writeFile('hello', 'hahahahah', 'utf-8', function (err) {
+    if(err){
+        console.log(err.message);
+    }
+});

memory-fs/tsconfig.json

@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es6",
+    "noImplicitAny": true,
+    "strictNullChecks": true,
+    "baseUrl": "../",
+    "typeRoots": [
+      "../"
+    ],
+    "types": [],
+    "noEmit": true,
+    "forceConsistentCasingInFileNames": true
+  },
+  "files": [
+    "index.d.ts",
+    "memory-fs-tests.ts",
+    "lib/join-tests.ts",
+    "lib/join.d.ts",
+    "lib/normalize-tests.ts",
+    "lib/normalize.d.ts"
+  ]
+}