feat: move CLI cache to OS temp directory to avoid project pollution

Author: johnsoncodehk

README.md

@@ -121,6 +121,13 @@ npx tsslint --project packages/*/tsconfig.json --vue-project apps/web/tsconfig.j
 
 # Using brace expansion for multiple patterns
 npx tsslint --project {tsconfig.json,packages/*/tsconfig.json,extensions/*/tsconfig.json}
+
+> [!NOTE]
+> The brace expansion pattern (`{a,b}`) is handled by your shell (e.g., bash, zsh) before the command is executed. The CLI receives a list of arguments.
+> 
+> For glob patterns (`*`), TSSLint uses an internal `glob` library to ensure cross-platform compatibility (especially on Windows) and to support advanced features like file watching, where the original pattern is needed.
+> 
+> **CLI Caching**: The CLI uses a file system cache to speed up subsequent runs. The cache files are stored in your operating system's temporary directory (`os.tmpdir()`) to avoid polluting your project's file system. The cache is automatically invalidated when the project's `tsslint.config.ts` or the CLI arguments change.
 ```
 
 > [!TIP]

packages/cli/lib/cache.ts

@@ -1,6 +1,7 @@
 import core = require('@tsslint/core');
 import path = require('path');
 import fs = require('fs');
+import os = require('os');
 
 export type CacheData = Record<string /* fileName */, core.FileLintCache>;
 
@@ -9,14 +10,14 @@ export function loadCache(
 	configFilePath: string,
 	createHash: (path: string) => string = btoa
 ): CacheData {
-	const outDir = getDotTsslintPath(configFilePath);
+	const outDir = getTsslintCachePath(configFilePath, createHash);
 	const cacheFileName = createHash(path.relative(outDir, configFilePath)) + '_' + createHash(JSON.stringify(process.argv)) + '_' + createHash(path.relative(outDir, tsconfig)) + '.cache.json';
 	const cacheFilePath = path.join(outDir, cacheFileName);
 	const cacheFileStat = fs.statSync(cacheFilePath, { throwIfNoEntry: false });
 	const configFileStat = fs.statSync(configFilePath, { throwIfNoEntry: false });
 	if (cacheFileStat?.isFile() && cacheFileStat.mtimeMs > (configFileStat?.mtimeMs ?? 0)) {
 		try {
-			return require(cacheFilePath);
+			return JSON.parse(fs.readFileSync(cacheFilePath, 'utf8'));
 		} catch {
 			return {};
 		}
@@ -30,13 +31,15 @@ export function saveCache(
 	cache: CacheData,
 	createHash: (path: string) => string = btoa
 ): void {
-	const outDir = getDotTsslintPath(configFilePath);
+	const outDir = getTsslintCachePath(configFilePath, createHash);
 	const cacheFileName = createHash(path.relative(outDir, configFilePath)) + '_' + createHash(JSON.stringify(process.argv)) + '_' + createHash(path.relative(outDir, tsconfig)) + '.cache.json';
 	const cacheFilePath = path.join(outDir, cacheFileName);
 	fs.mkdirSync(outDir, { recursive: true });
 	fs.writeFileSync(cacheFilePath, JSON.stringify(cache));
 }
 
-function getDotTsslintPath(configFilePath: string): string {
-	return path.resolve(configFilePath, '..', 'node_modules', '.tsslint');
+function getTsslintCachePath(configFilePath: string, createHash: (path: string) => string): string {
+	const projectRoot = path.resolve(configFilePath, '..');
+	const projectHash = createHash(projectRoot);
+	return path.join(os.tmpdir(), 'tsslint-cache-' + projectHash);
 }