chore: enable some eslint rules

eslint.config.js

@@ -96,7 +96,7 @@ export default tseslint.config(
       ],
 
       '@typescript-eslint/ban-ts-comment': 'error',
-      '@typescript-eslint/no-unsafe-function-type': 'off', // TODO: we should turn this on in a new PR
+      '@typescript-eslint/no-unsafe-function-type': 'off',
       '@typescript-eslint/explicit-module-boundary-types': [
         'error',
         { allowArgumentsExplicitlyTypedAsAny: true },
@@ -107,26 +107,33 @@ export default tseslint.config(
       ],
       '@typescript-eslint/no-empty-object-type': [
         'error',
-        { allowInterfaces: 'with-single-extends' }, // maybe we should turn this on in a new PR
+        { allowInterfaces: 'with-single-extends' },
       ],
       '@typescript-eslint/no-empty-interface': 'off',
-      '@typescript-eslint/no-explicit-any': 'off', // maybe we should turn this on in a new PR
+      '@typescript-eslint/no-explicit-any': 'off',
       'no-extra-semi': 'off',
       '@typescript-eslint/no-extra-semi': 'off', // conflicts with prettier
       '@typescript-eslint/no-inferrable-types': 'off',
-      '@typescript-eslint/no-unused-expressions': 'off', // maybe we should turn this on in a new PR
-      '@typescript-eslint/no-unused-vars': 'off', // maybe we should turn this on in a new PR
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        {
+          args: 'all',
+          argsIgnorePattern: '^_',
+          caughtErrors: 'all',
+          caughtErrorsIgnorePattern: '^_',
+          destructuredArrayIgnorePattern: '^_',
+          varsIgnorePattern: '^_',
+          ignoreRestSiblings: true,
+        },
+      ],
       '@typescript-eslint/no-require-imports': 'off',
       '@typescript-eslint/consistent-type-imports': [
         'error',
         { prefer: 'type-imports', disallowTypeAnnotations: false },
       ],
       // disable rules set in @typescript-eslint/stylistic which conflict with current code
-      // maybe we should turn them on in a new PR
+      // we should discuss if we want to enable these as they encourage consistent code
       '@typescript-eslint/array-type': 'off',
-      '@typescript-eslint/ban-tslint-comment': 'off',
-      '@typescript-eslint/consistent-generic-constructors': 'off',
-      '@typescript-eslint/consistent-indexed-object-style': 'off',
       '@typescript-eslint/consistent-type-definitions': 'off',
       '@typescript-eslint/prefer-for-of': 'off',
       '@typescript-eslint/prefer-function-type': 'off',
@@ -270,6 +277,8 @@ export default tseslint.config(
       'n/no-unsupported-features/es-builtins': 'off',
       'n/no-unsupported-features/node-builtins': 'off',
       '@typescript-eslint/explicit-module-boundary-types': 'off',
+      '@typescript-eslint/no-unused-expressions': 'off',
+      '@typescript-eslint/no-unused-vars': 'off',
       'no-undef': 'off',
       'no-empty': 'off',
       'no-constant-condition': 'off',
@@ -298,6 +307,7 @@ export default tseslint.config(
     name: 'disables/dts',
     files: ['**/*.d.ts'],
     rules: {
+      '@typescript-eslint/consistent-indexed-object-style': 'off',
       '@typescript-eslint/triple-slash-reference': 'off',
     },
   },

packages/create-vite/build.config.ts

@@ -20,7 +20,7 @@ export default defineBuildConfig({
     prompts: 'prompts/lib/index.js',
   },
   hooks: {
-    'rollup:options'(ctx, options) {
+    'rollup:options'(_ctx, options) {
       options.plugins = [
         options.plugins,
         // @ts-expect-error TODO: unbuild uses rollup v3 and Vite uses rollup v4

packages/plugin-legacy/src/index.ts

@@ -115,7 +115,7 @@ function toAssetPathFromHtml(
   config: ResolvedConfig,
 ): string {
   const relativeUrlPath = normalizePath(path.relative(config.root, htmlPath))
-  const toRelative = (filename: string, hostId: string) =>
+  const toRelative = (filename: string, _hostId: string) =>
     getBaseInHTML(relativeUrlPath, config) + filename
   return toOutputFilePathInHtml(
     filename,
@@ -296,11 +296,12 @@ function viteLegacyPlugin(options: Options = {}): Plugin[] {
         if (!modernPolyfills.size) {
           return
         }
-        isDebug &&
+        if (isDebug) {
           console.log(
             `[@vitejs/plugin-legacy] modern polyfills:`,
             modernPolyfills,
           )
+        }
         const polyfillChunk = await buildPolyfillChunk(
           config.mode,
           modernPolyfills,
@@ -338,11 +339,12 @@ function viteLegacyPlugin(options: Options = {}): Plugin[] {
       }
 
       if (legacyPolyfills.size || !options.externalSystemJS) {
-        isDebug &&
+        if (isDebug) {
           console.log(
             `[@vitejs/plugin-legacy] legacy polyfills:`,
             legacyPolyfills,
           )
+        }
 
         await buildPolyfillChunk(
           config.mode,
@@ -377,8 +379,9 @@ function viteLegacyPlugin(options: Options = {}): Plugin[] {
       config = _config
 
       modernTargets = options.modernTargets || modernTargetsBabel
-      isDebug &&
+      if (isDebug) {
         console.log(`[@vitejs/plugin-legacy] modernTargets:`, modernTargets)
+      }
 
       if (!genLegacy || config.build.ssr) {
         return
@@ -388,7 +391,9 @@ function viteLegacyPlugin(options: Options = {}): Plugin[] {
         options.targets ||
         browserslistLoadConfig({ path: config.root }) ||
         'last 2 versions and not dead, > 0.3%, Firefox ESR'
-      isDebug && console.log(`[@vitejs/plugin-legacy] targets:`, targets)
+      if (isDebug) {
+        console.log(`[@vitejs/plugin-legacy] targets:`, targets)
+      }
 
       const getLegacyOutputFileName = (
         fileNames:

packages/plugin-legacy/src/types.ts

@@ -2,7 +2,7 @@ export interface Options {
   /**
    * default: 'defaults'
    */
-  targets?: string | string[] | { [key: string]: string }
+  targets?: string | string[] | Record<string, string>
   /**
    * default: 'edge>=79, firefox>=67, chrome>=64, safari>=12, chromeAndroid>=64, iOS>=12'
    */

packages/vite/bin/vite.js

@@ -5,7 +5,7 @@ if (!import.meta.url.includes('node_modules')) {
   try {
     // only available as dev dependency
     await import('source-map-support').then((r) => r.default.install())
-  } catch (e) {}
+  } catch {}
 }
 
 global.__vite_start_time = performance.now()

packages/vite/src/client/env.ts

@@ -1,4 +1,3 @@
-declare const __MODE__: string
 declare const __DEFINES__: Record<string, any>
 
 const context = (() => {

packages/vite/src/module-runner/moduleCache.ts

@@ -114,7 +114,9 @@ export class ModuleCacheMap extends Map<string, ModuleCache> {
       const subIds = Array.from(super.entries())
         .filter(([, mod]) => mod.importers?.has(id))
         .map(([key]) => key)
-      subIds.length && this.invalidateSubDepTree(subIds, invalidated)
+      if (subIds.length) {
+        this.invalidateSubDepTree(subIds, invalidated)
+      }
       super.delete(id)
     }
     return invalidated

packages/vite/src/module-runner/runner.ts

@@ -364,7 +364,7 @@ export class ModuleRunner {
       dirname: isWindows ? toWindowsPath(dirname) : dirname,
       url: href,
       env: this.envProxy,
-      resolve(id, parent) {
+      resolve(_id, _parent) {
         throw new Error(
           '[module runner] "import.meta.resolve" is not supported.',
         )
@@ -437,7 +437,7 @@ function exportAll(exports: any, sourceModule: any) {
           configurable: true,
           get: () => sourceModule[key],
         })
-      } catch (_err) {}
+      } catch {}
     }
   }
 }

packages/vite/src/module-runner/sourcemap/interceptor.ts

@@ -21,7 +21,7 @@ export interface InterceptorOptions {
 const sourceMapCache: Record<string, CachedMapEntry> = {}
 const fileContentsCache: Record<string, string> = {}
 
-const moduleGraphs: Set<ModuleCacheMap> = new Set()
+const moduleGraphs = new Set<ModuleCacheMap>()
 const retrieveFileHandlers = new Set<RetrieveFileHandler>()
 const retrieveSourceMapHandlers = new Set<RetrieveSourceMapHandler>()
 

packages/vite/src/node/__tests__/plugins/css.spec.ts

@@ -227,7 +227,7 @@ async function createCssPluginTransform(
   const mockFs = vi
     .spyOn(fs, 'readFile')
     // @ts-expect-error vi.spyOn not recognize override `fs.readFile` definition.
-    .mockImplementationOnce((p, encoding, callback) => {
+    .mockImplementationOnce((p, _encoding, callback) => {
       callback(null, Buffer.from(files?.[p] ?? ''))
     })
 

packages/vite/src/node/external.ts

@@ -95,7 +95,7 @@ export function createIsConfiguredAsExternal(
         // configured as external
         !!configuredAsExternal,
       )?.external
-    } catch (e) {
+    } catch {
       debug?.(
         `Failed to node resolve "${id}". Skipping externalizing it by default.`,
       )

packages/vite/src/node/optimizer/index.ts

@@ -367,7 +367,7 @@ export async function loadCachedDepOptimizationMetadata(
         await fsp.readFile(cachedMetadataPath, 'utf-8'),
         depsCacheDir,
       )
-    } catch (e) {}
+    } catch {}
     // hash is consistent, no need to re-bundle
     if (cachedMetadata) {
       if (cachedMetadata.lockfileHash !== getLockfileHash(environment)) {
@@ -508,7 +508,7 @@ export function runOptimizeDeps(
       try {
         // When exiting the process, `fsp.rm` may not take effect, so we use `fs.rmSync`
         fs.rmSync(processingCacheDir, { recursive: true, force: true })
-      } catch (error) {
+      } catch {
         // Ignore errors
       }
     }
@@ -1286,7 +1286,7 @@ export async function cleanupDepsCacheStaleDirs(
       for (const dirent of dirents) {
         if (dirent.isDirectory() && dirent.name.includes('_temp_')) {
           const tempDirPath = path.resolve(config.cacheDir, dirent.name)
-          const stats = await fsp.stat(tempDirPath).catch((_) => null)
+          const stats = await fsp.stat(tempDirPath).catch(() => null)
           if (
             stats?.mtime &&
             Date.now() - stats.mtime.getTime() > MAX_TEMP_DIR_AGE_MS
@@ -1331,7 +1331,7 @@ const safeRename = promisify(function gracefulRename(
       Date.now() - start < GRACEFUL_RENAME_TIMEOUT
     ) {
       setTimeout(function () {
-        fs.stat(to, function (stater, st) {
+        fs.stat(to, function (stater, _st) {
           if (stater && stater.code === 'ENOENT') fs.rename(from, to, CB)
           else CB(er)
         })

packages/vite/src/node/plugin.ts

@@ -14,7 +14,7 @@ import type {
   ResolvedConfig,
   UserConfig,
 } from './config'
-import type { ServerHook, ViteDevServer } from './server'
+import type { ServerHook } from './server'
 import type { IndexHtmlTransform } from './plugins/html'
 import type { EnvironmentModuleNode } from './server/moduleGraph'
 import type { ModuleNode } from './server/mixedModuleGraph'

packages/vite/src/node/plugins/completeSystemWrap.ts

@@ -9,7 +9,7 @@ export function completeSystemWrapPlugin(): Plugin {
   return {
     name: 'vite:force-systemjs-wrap-complete',
 
-    renderChunk(code, chunk, opts) {
+    renderChunk(code, _chunk, opts) {
       if (opts.format === 'system') {
         return {
           code: code.replace(SystemJSWrapRE, (s, s1) =>

packages/vite/src/node/plugins/css.ts

@@ -210,6 +210,7 @@ const enum PreprocessLang {
   styl = 'styl',
   stylus = 'stylus',
 }
+// eslint-disable-next-line @typescript-eslint/no-unused-vars -- bug in typescript-eslint
 const enum PureCssLang {
   css = 'css',
 }
@@ -964,7 +965,7 @@ export function cssAnalysisPlugin(config: ResolvedConfig): Plugin {
   return {
     name: 'vite:css-analysis',
 
-    async transform(_, id, options) {
+    async transform(_, id) {
       if (
         !isCSSRequest(id) ||
         commonjsProxyRE.test(id) ||
@@ -2056,7 +2057,7 @@ function loadSassPackage(root: string): {
     try {
       const path = loadPreprocessorPath(PreprocessLang.sass, root)
       return { name: 'sass', path }
-    } catch (e2) {
+    } catch (_e2) {
       throw e1
     }
   }
@@ -2173,9 +2174,11 @@ const makeScssWorker = (
         }
         const importer = [_internalImporter]
         if (options.importer) {
-          Array.isArray(options.importer)
-            ? importer.unshift(...options.importer)
-            : importer.unshift(options.importer)
+          if (Array.isArray(options.importer)) {
+            importer.unshift(...options.importer)
+          } else {
+            importer.unshift(options.importer)
+          }
         }
 
         const finalOptions: Sass.LegacyOptions<'async'> = {
@@ -2847,7 +2850,7 @@ const stylProcessor = (
         worker.stop()
       }
     },
-    async process(environment, source, root, options, resolvers) {
+    async process(_environment, source, root, options, _resolvers) {
       const stylusPath = loadPreprocessorPath(PreprocessLang.stylus, root)
 
       if (!workerMap.has(options.alias)) {

packages/vite/src/node/plugins/dynamicImportVars.ts

@@ -207,7 +207,7 @@ export function dynamicImportVarsPlugin(config: ResolvedConfig): Plugin {
       let imports: readonly ImportSpecifier[] = []
       try {
         imports = parseImports(source)[0]
-      } catch (e: any) {
+      } catch {
         // ignore as it might not be a JS file, the subsequent plugins will catch the error
         return null
       }

packages/vite/src/node/plugins/esbuild.ts

@@ -152,10 +152,10 @@ export async function transformWithEsbuild(
     // esbuild uses tsconfig fields when both the normal options and tsconfig was set
     // but we want to prioritize the normal options
     if (options) {
-      options.jsx && (compilerOptions.jsx = undefined)
-      options.jsxFactory && (compilerOptions.jsxFactory = undefined)
-      options.jsxFragment && (compilerOptions.jsxFragmentFactory = undefined)
-      options.jsxImportSource && (compilerOptions.jsxImportSource = undefined)
+      if (options.jsx) compilerOptions.jsx = undefined
+      if (options.jsxFactory) compilerOptions.jsxFactory = undefined
+      if (options.jsxFragment) compilerOptions.jsxFragmentFactory = undefined
+      if (options.jsxImportSource) compilerOptions.jsxImportSource = undefined
     }
 
     tsconfigRaw = {

packages/vite/src/node/plugins/html.ts

@@ -338,8 +338,7 @@ export function buildHtmlPlugin(config: ResolvedConfig): Plugin {
         const publicPath = `/${relativeUrlPath}`
         const publicBase = getBaseInHTML(relativeUrlPath, config)
 
-        const publicToRelative = (filename: string, importer: string) =>
-          publicBase + filename
+        const publicToRelative = (filename: string) => publicBase + filename
         const toOutputPublicFilePath = (url: string) =>
           toOutputFilePathInHtml(
             url.slice(1),
@@ -694,7 +693,7 @@ export function buildHtmlPlugin(config: ResolvedConfig): Plugin {
     },
 
     async generateBundle(options, bundle) {
-      const analyzedChunk: Map<OutputChunk, number> = new Map()
+      const analyzedChunk = new Map<OutputChunk, number>()
       const inlineEntryChunk = new Set<string>()
       const getImportedChunks = (
         chunk: OutputChunk,
@@ -797,7 +796,7 @@ export function buildHtmlPlugin(config: ResolvedConfig): Plugin {
               relativeUrlPath,
               'html',
               config,
-              (filename: string, importer: string) => assetsBase + filename,
+              (filename) => assetsBase + filename,
             )
           }
         }

packages/vite/src/node/plugins/importAnalysisBuild.ts

@@ -513,7 +513,7 @@ export function buildImportAnalysisPlugin(config: ResolvedConfig): Plugin {
                 if (rawUrl[0] === `"` && rawUrl[rawUrl.length - 1] === `"`)
                   url = rawUrl.slice(1, -1)
               }
-              const deps: Set<string> = new Set()
+              const deps = new Set<string>()
               let hasRemovedPureCssChunk = false
 
               let normalizedFile: string | undefined = undefined

packages/vite/src/node/plugins/importMetaGlob.ts

@@ -220,7 +220,7 @@ export async function parseImportGlob(
   let cleanCode: string
   try {
     cleanCode = stripLiteral(code)
-  } catch (e) {
+  } catch {
     // skip invalid js code
     return []
   }