refactor: fix logic errors found by no-unnecessary-condition rule

packages/create-vite/src/index.ts

@@ -289,9 +289,10 @@ const FRAMEWORKS: Framework[] = [
   },
 ]
 
-const TEMPLATES = FRAMEWORKS.map(
-  (f) => (f.variants && f.variants.map((v) => v.name)) || [f.name],
-).reduce((a, b) => a.concat(b), [])
+const TEMPLATES = FRAMEWORKS.map((f) => f.variants.map((v) => v.name)).reduce(
+  (a, b) => a.concat(b),
+  [],
+)
 
 const renameFiles: Record<string, string | undefined> = {
   _gitignore: '.gitignore',
@@ -394,8 +395,8 @@ async function init() {
           }),
         },
         {
-          type: (framework: Framework) =>
-            framework && framework.variants ? 'select' : null,
+          type: (framework: Framework | /* package name */ string) =>
+            typeof framework === 'object' ? 'select' : null,
           name: 'variant',
           message: reset('Select a variant:'),
           choices: (framework: Framework) =>

packages/vite/src/client/overlay.ts

@@ -264,23 +264,21 @@ export class ErrorOverlay extends HTMLElement {
       fileRE.lastIndex = 0
       while ((match = fileRE.exec(text))) {
         const { 0: file, index } = match
-        if (index != null) {
-          const frag = text.slice(curIndex, index)
-          el.appendChild(document.createTextNode(frag))
-          const link = document.createElement('a')
-          link.textContent = file
-          link.className = 'file-link'
-          link.onclick = () => {
-            fetch(
-              new URL(
-                `${base}__open-in-editor?file=${encodeURIComponent(file)}`,
-                import.meta.url,
-              ),
-            )
-          }
-          el.appendChild(link)
-          curIndex += frag.length + file.length
+        const frag = text.slice(curIndex, index)
+        el.appendChild(document.createTextNode(frag))
+        const link = document.createElement('a')
+        link.textContent = file
+        link.className = 'file-link'
+        link.onclick = () => {
+          fetch(
+            new URL(
+              `${base}__open-in-editor?file=${encodeURIComponent(file)}`,
+              import.meta.url,
+            ),
+          )
         }
+        el.appendChild(link)
+        curIndex += frag.length + file.length
       }
     }
   }

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

@@ -151,11 +151,11 @@ function getModulesEntrypoints(
     if (!module) {
       continue
     }
-    if (module.importers && !module.importers.size) {
+    if (!module.importers.size) {
       entrypoints.add(module.url)
       continue
     }
-    for (const importer of module.importers || []) {
+    for (const importer of module.importers) {
       getModulesEntrypoints(runner, [importer], visited, entrypoints)
     }
   }
@@ -167,7 +167,7 @@ function findAllEntrypoints(
   entrypoints = new Set<string>(),
 ): Set<string> {
   for (const mod of runner.evaluatedModules.idToModuleMap.values()) {
-    if (mod.importers && !mod.importers.size) {
+    if (!mod.importers.size) {
       entrypoints.add(mod.url)
     }
   }

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

@@ -210,7 +210,7 @@ function mapSourcePosition(position: OriginalMapping) {
   }
 
   // Resolve the source URL relative to the URL of the source map
-  if (sourceMap && sourceMap.map && sourceMap.url) {
+  if (sourceMap.map && sourceMap.url) {
     const originalPosition = getOriginalPosition(sourceMap.map, position)
 
     // Only return the original position if a matching line was found. If no

packages/vite/src/node/build.ts

@@ -391,7 +391,7 @@ export function resolveBuildEnvironmentOptions(
   logger: Logger,
   consumer: 'client' | 'server' | undefined,
 ): ResolvedBuildEnvironmentOptions {
-  const deprecatedPolyfillModulePreload = raw?.polyfillModulePreload
+  const deprecatedPolyfillModulePreload = raw.polyfillModulePreload
   const { polyfillModulePreload, ...rest } = raw
   raw = rest
   if (deprecatedPolyfillModulePreload !== undefined) {
@@ -543,7 +543,7 @@ async function buildEnvironment(
 
   const resolve = (p: string) => path.resolve(root, p)
   const input = libOptions
-    ? options.rollupOptions?.input ||
+    ? options.rollupOptions.input ||
       (typeof libOptions.entry === 'string'
         ? resolve(libOptions.entry)
         : Array.isArray(libOptions.entry)
@@ -556,7 +556,7 @@ async function buildEnvironment(
             ))
     : typeof options.ssr === 'string'
       ? resolve(options.ssr)
-      : options.rollupOptions?.input || resolve('index.html')
+      : options.rollupOptions.input || resolve('index.html')
 
   if (ssr && typeof input === 'string' && input.endsWith('.html')) {
     throw new Error(
@@ -596,7 +596,7 @@ async function buildEnvironment(
     output: options.rollupOptions.output,
     input,
     plugins,
-    external: options.rollupOptions?.external,
+    external: options.rollupOptions.external,
     onwarn(warning, warn) {
       onRollupWarning(warning, warn, environment)
     },
@@ -743,7 +743,7 @@ async function buildEnvironment(
 
     // resolve lib mode outputs
     const outputs = resolveBuildOutputs(
-      options.rollupOptions?.output,
+      options.rollupOptions.output,
       libOptions,
       logger,
     )
@@ -760,7 +760,7 @@ async function buildEnvironment(
     const resolvedOutDirs = getResolvedOutDirs(
       root,
       options.outDir,
-      options.rollupOptions?.output,
+      options.rollupOptions.output,
     )
     const emptyOutDir = resolveEmptyOutDir(
       options.emptyOutDir,
@@ -1058,7 +1058,7 @@ export function onRollupWarning(
   }
 
   clearLine()
-  const userOnWarn = environment.config.build.rollupOptions?.onwarn
+  const userOnWarn = environment.config.build.rollupOptions.onwarn
   if (userOnWarn) {
     userOnWarn(warning, viteWarn)
   } else {
@@ -1441,7 +1441,7 @@ export class BuildEnvironment extends BaseEnvironment {
     if (setup?.options) {
       options = mergeConfig(
         options,
-        setup?.options,
+        setup.options,
       ) as ResolvedEnvironmentOptions
     }
     super(name, config, options)

packages/vite/src/node/config.ts

@@ -25,6 +25,7 @@ import {
   FS_PREFIX,
 } from './constants'
 import type {
+  FalsyPlugin,
   HookHandler,
   Plugin,
   PluginOption,
@@ -1002,7 +1003,7 @@ export async function resolveConfig(
   mode = inlineConfig.mode || config.mode || mode
   configEnv.mode = mode
 
-  const filterPlugin = (p: Plugin) => {
+  const filterPlugin = (p: Plugin | FalsyPlugin): p is Plugin => {
     if (!p) {
       return false
     } else if (!p.apply) {
@@ -1015,9 +1016,9 @@ export async function resolveConfig(
   }
 
   // resolve plugins
-  const rawPlugins = (
-    (await asyncFlatten(config.plugins || [])) as Plugin[]
-  ).filter(filterPlugin)
+  const rawPlugins = (await asyncFlatten(config.plugins || [])).filter(
+    filterPlugin,
+  )
 
   const [prePlugins, normalPlugins, postPlugins] = sortUserPlugins(rawPlugins)
 
@@ -1068,12 +1069,12 @@ export async function resolveConfig(
   // Backward compatibility: server.warmup.clientFiles/ssrFiles -> environment.dev.warmup
   const warmupOptions = config.server?.warmup
   if (warmupOptions?.clientFiles) {
-    configEnvironmentsClient.dev.warmup = warmupOptions?.clientFiles
+    configEnvironmentsClient.dev.warmup = warmupOptions.clientFiles
   }
   if (warmupOptions?.ssrFiles) {
     configEnvironmentsSsr ??= {}
     configEnvironmentsSsr.dev ??= {}
-    configEnvironmentsSsr.dev.warmup = warmupOptions?.ssrFiles
+    configEnvironmentsSsr.dev.warmup = warmupOptions.ssrFiles
   }
 
   // Backward compatibility: merge ssr into environments.ssr.config as defaults
@@ -1102,11 +1103,7 @@ export async function resolveConfig(
   }
 
   // The client and ssr environment configs can't be removed by the user in the config hook
-  if (
-    !config.environments ||
-    !config.environments.client ||
-    (!config.environments.ssr && !isBuild)
-  ) {
+  if (!config.environments.client || (!config.environments.ssr && !isBuild)) {
     throw new Error(
       'Required environments configuration were stripped out in the config hook',
     )
@@ -1244,7 +1241,7 @@ export async function resolveConfig(
     ? !isBuild || config.build?.ssr
       ? '/'
       : './'
-    : (resolveBaseUrl(config.base, isBuild, logger) ?? configDefaults.base)
+    : resolveBaseUrl(config.base, isBuild, logger)
 
   // resolve cache directory
   const pkgDir = findNearestPackageData(resolvedRoot, packageCache)?.dir
@@ -1301,7 +1298,7 @@ export async function resolveConfig(
     // And Plugins may also have cached that could be corrupted by being used in these extra rollup calls.
     // So we need to separate the worker plugin from the plugin that vite needs to run.
     const rawWorkerUserPlugins = (
-      (await asyncFlatten(createUserWorkerPlugins?.() || [])) as Plugin[]
+      await asyncFlatten(createUserWorkerPlugins?.() || [])
     ).filter(filterPlugin)
 
     // resolve worker
@@ -1577,7 +1574,7 @@ assetFileNames isn't equal for every build.rollupOptions.output. A single patter
  * electron or expects to deploy
  */
 export function resolveBaseUrl(
-  base: UserConfig['base'] = '/',
+  base: UserConfig['base'] = configDefaults.base,
   isBuild: boolean,
   logger: Logger,
 ): string {
@@ -1846,7 +1843,7 @@ async function bundleConfigFile(
   const { text } = result.outputFiles[0]
   return {
     code: text,
-    dependencies: result.metafile ? Object.keys(result.metafile.inputs) : [],
+    dependencies: Object.keys(result.metafile.inputs),
   }
 }
 
@@ -1934,11 +1931,9 @@ async function runConfigHook(
   for (const p of getSortedPluginsByHook('config', plugins)) {
     const hook = p.config
     const handler = getHookHandler(hook)
-    if (handler) {
-      const res = await handler(conf, configEnv)
-      if (res && res !== conf) {
-        conf = mergeConfig(conf, res)
-      }
+    const res = await handler(conf, configEnv)
+    if (res && res !== conf) {
+      conf = mergeConfig(conf, res)
     }
   }
 
@@ -1955,15 +1950,13 @@ async function runConfigEnvironmentHook(
   for (const p of getSortedPluginsByHook('configEnvironment', plugins)) {
     const hook = p.configEnvironment
     const handler = getHookHandler(hook)
-    if (handler) {
-      for (const name of environmentNames) {
-        const res = await handler(name, environments[name], {
-          ...configEnv,
-          isSsrTargetWebworker: isSsrTargetWebworkerSet && name === 'ssr',
-        })
-        if (res) {
-          environments[name] = mergeConfig(environments[name], res)
-        }
+    for (const name of environmentNames) {
+      const res = await handler(name, environments[name], {
+        ...configEnv,
+        isSsrTargetWebworker: isSsrTargetWebworkerSet && name === 'ssr',
+      })
+      if (res) {
+        environments[name] = mergeConfig(environments[name], res)
       }
     }
   }
@@ -1977,7 +1970,7 @@ function optimizeDepsDisabledBackwardCompatibility(
   const optimizeDepsDisabled = optimizeDeps.disabled
   if (optimizeDepsDisabled !== undefined) {
     if (optimizeDepsDisabled === true || optimizeDepsDisabled === 'dev') {
-      const commonjsOptionsInclude = resolved.build?.commonjsOptions?.include
+      const commonjsOptionsInclude = resolved.build.commonjsOptions.include
       const commonjsPluginDisabled =
         Array.isArray(commonjsOptionsInclude) &&
         commonjsOptionsInclude.length === 0

packages/vite/src/node/external.ts

@@ -61,7 +61,7 @@ export function createIsConfiguredAsExternal(
     !(Array.isArray(noExternal) && noExternal.length === 0) &&
     createFilter(undefined, noExternal, { resolve: false })
 
-  const targetConditions = resolve.externalConditions || []
+  const targetConditions = resolve.externalConditions
 
   const resolveOptions: InternalResolveOptions = {
     ...resolve,

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

@@ -57,7 +57,7 @@ export function esbuildDepPlugin(
 
   // remove optimizable extensions from `externalTypes` list
   const allExternalTypes = extensions
-    ? externalTypes.filter((type) => !extensions?.includes('.' + type))
+    ? externalTypes.filter((type) => !extensions.includes('.' + type))
     : externalTypes
 
   // use separate package cache for optimizer as it caches paths around node_modules