refactor(cli): simplify cache key and fix cache fragmentation

- Remove argv from cache key (was causing cache fragmentation due to argument order)
- Use absolute paths instead of relative paths
- Include languages in cache key to distinguish --project vs --vue-project
- Simplify cache directory structure: tmpdir/tsslint-cache/{version}/

Author: johnsoncodehk

packages/cli/index.ts

@@ -168,7 +168,7 @@ class Project {
 		);
 
 		if (!process.argv.includes('--force')) {
-			this.cache = cache.loadCache(this.tsconfig, this.configFile, ts.sys.createHash);
+			this.cache = cache.loadCache(this.tsconfig, this.configFile, this.languages, ts.sys.createHash);
 		}
 
 		return this;
@@ -585,7 +585,7 @@ class Project {
 			);
 		}
 
-		cache.saveCache(project.tsconfig, project.configFile!, project.cache, ts.sys.createHash);
+		cache.saveCache(project.tsconfig, project.configFile!, project.languages, project.cache, ts.sys.createHash);
 
 		await startWorker(linterWorker);
 	}

packages/cli/lib/cache.ts

@@ -10,11 +10,12 @@ const pkg = require('../package.json');
 export function loadCache(
 	tsconfig: string,
 	configFilePath: string,
+	languages: string[],
 	createHash: (path: string) => string = btoa,
 ): CacheData {
-	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 outDir = getTsslintCachePath();
+	const cacheKey = configFilePath + '\0' + tsconfig + '\0' + languages.sort().join(',');
+	const cacheFileName = createHash(cacheKey) + '.cache.json';
 	const cacheFilePath = path.join(outDir, cacheFileName);
 	const cacheFileStat = fs.statSync(cacheFilePath, { throwIfNoEntry: false });
 	const configFileStat = fs.statSync(configFilePath, { throwIfNoEntry: false });
@@ -32,19 +33,18 @@ export function loadCache(
 export function saveCache(
 	tsconfig: string,
 	configFilePath: string,
+	languages: string[],
 	cache: CacheData,
 	createHash: (path: string) => string = btoa,
 ): void {
-	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 outDir = getTsslintCachePath();
+	const cacheKey = configFilePath + '\0' + tsconfig + '\0' + languages.sort().join(',');
+	const cacheFileName = createHash(cacheKey) + '.cache.json';
 	const cacheFilePath = path.join(outDir, cacheFileName);
 	fs.mkdirSync(outDir, { recursive: true });
 	fs.writeFileSync(cacheFilePath, JSON.stringify(cache));
 }
 
-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-' + pkg.version + '-' + projectHash);
+function getTsslintCachePath(): string {
+	return path.join(os.tmpdir(), 'tsslint-cache', pkg.version);
 }