fix: enforce separate type imports (#9288)

.eslintrc.cjs

@@ -58,6 +58,16 @@ module.exports = {
     '@typescript-eslint/unbound-method': 'off',
     '@typescript-eslint/no-explicit-any': 'off',
 
+    // Enforce separate type imports for type-only imports to avoid bundling unneeded code
+    '@typescript-eslint/consistent-type-imports': [
+      'error',
+      {
+        prefer: 'type-imports',
+        fixStyle: 'separate-type-imports',
+        disallowTypeAnnotations: false,
+      },
+    ],
+
     // These rules enabled by the preset configs don't work well for us
     '@typescript-eslint/await-thenable': 'off',
     'prefer-const': 'off',

packages/astro-rss/test/rss.test.js

@@ -1,18 +1,18 @@
-import rss, { getRssString } from '../dist/index.js';
-import { rssSchema } from '../dist/schema.js';
 import chai from 'chai';
 import chaiPromises from 'chai-as-promised';
 import chaiXml from 'chai-xml';
+import rss, { getRssString } from '../dist/index.js';
+import { rssSchema } from '../dist/schema.js';
 import {
-	title,
 	description,
-	site,
 	phpFeedItem,
 	phpFeedItemWithContent,
 	phpFeedItemWithCustomData,
+	site,
+	title,
 	web1FeedItem,
-	web1FeedItemWithContent,
 	web1FeedItemWithAllData,
+	web1FeedItemWithContent,
 } from './test-utils.js';
 
 chai.use(chaiPromises);

packages/astro/src/assets/build/generate.ts

@@ -1,7 +1,7 @@
 import { dim, green } from 'kleur/colors';
 import fs, { readFileSync } from 'node:fs';
 import { basename, join } from 'node:path/posix';
-import PQueue from 'p-queue';
+import type PQueue from 'p-queue';
 import type { AstroConfig } from '../../@types/astro.js';
 import type { BuildPipeline } from '../../core/build/buildPipeline.js';
 import { getOutDirWithinCwd } from '../../core/build/common.js';

packages/astro/src/core/build/buildPipeline.ts

@@ -2,7 +2,7 @@ import type { AstroConfig, AstroSettings, SSRLoadedRenderer } from '../../@types
 import { getOutputDirectory, isServerLikeOutput } from '../../prerender/utils.js';
 import { BEFORE_HYDRATION_SCRIPT_ID } from '../../vite-plugin-scripts/index.js';
 import type { SSRManifest } from '../app/types.js';
-import { Logger } from '../logger/core.js';
+import type { Logger } from '../logger/core.js';
 import { Pipeline } from '../pipeline.js';
 import { routeIsFallback, routeIsRedirect } from '../redirects/helpers.js';
 import { createEnvironment } from '../render/index.js';

packages/astro/src/core/build/generate.ts

@@ -10,7 +10,6 @@ import type {
 	GetStaticPathsItem,
 	RouteData,
 	RouteType,
-	SSRElement,
 	SSRError,
 	SSRLoadedRenderer,
 	SSRManifest,

packages/astro/src/core/build/index.ts

@@ -24,7 +24,8 @@ import { resolveConfig } from '../config/config.js';
 import { createNodeLogger } from '../config/logging.js';
 import { createSettings } from '../config/settings.js';
 import { createVite } from '../create-vite.js';
-import { Logger, levels, timerMessage } from '../logger/core.js';
+import type { Logger } from '../logger/core.js';
+import { levels, timerMessage } from '../logger/core.js';
 import { apply as applyPolyfill } from '../polyfill.js';
 import { RouteCache } from '../render/route-cache.js';
 import { createRouteManifest } from '../routing/index.js';

packages/astro/src/core/compile/compile.ts

@@ -5,7 +5,8 @@ import type { AstroConfig } from '../../@types/astro.js';
 import { transform } from '@astrojs/compiler';
 import { fileURLToPath } from 'node:url';
 import { normalizePath } from 'vite';
-import { AggregateError, AstroError, CompilerError } from '../errors/errors.js';
+import type { AstroError } from '../errors/errors.js';
+import { AggregateError, CompilerError } from '../errors/errors.js';
 import { AstroErrorData } from '../errors/index.js';
 import { resolvePath } from '../util.js';
 import { createStylePreprocessor } from './style.js';

packages/astro/src/core/dev/restart.ts

@@ -1,4 +1,4 @@
-import nodeFs from 'node:fs';
+import type nodeFs from 'node:fs';
 import { fileURLToPath } from 'node:url';
 import * as vite from 'vite';
 import type { AstroInlineConfig, AstroSettings } from '../../@types/astro.js';

packages/astro/src/core/logger/node.ts

@@ -1,5 +1,5 @@
 import debugPackage from 'debug';
-import { Writable } from 'node:stream';
+import type { Writable } from 'node:stream';
 import { getEventPrefix, levels, type LogMessage, type LogWritable } from './core.js';
 
 type ConsoleStream = Writable & {

packages/astro/src/core/render/params-and-props.ts

@@ -4,7 +4,8 @@ import type { Logger } from '../logger/core.js';
 import { routeIsFallback } from '../redirects/helpers.js';
 import { routeIsRedirect } from '../redirects/index.js';
 import { getParams } from '../routing/params.js';
-import { RouteCache, callGetStaticPaths, findPathItemByKey } from './route-cache.js';
+import type { RouteCache } from './route-cache.js';
+import { callGetStaticPaths, findPathItemByKey } from './route-cache.js';
 
 interface GetParamsAndPropsOptions {
 	mod: ComponentInstance | undefined;

packages/astro/src/core/render/route-cache.ts

@@ -8,7 +8,6 @@ import type {
 	RouteData,
 	RuntimeMode,
 } from '../../@types/astro.js';
-import { AstroError, AstroErrorData } from '../errors/index.js';
 import type { Logger } from '../logger/core.js';
 
 import { stringifyParams } from '../routing/params.js';

packages/astro/src/integrations/index.ts

@@ -18,7 +18,7 @@ import type { SerializedSSRManifest } from '../core/app/types.js';
 import type { PageBuildData } from '../core/build/types.js';
 import { buildClientDirectiveEntrypoint } from '../core/client-directive/index.js';
 import { mergeConfig } from '../core/config/index.js';
-import { AstroIntegrationLogger, type Logger } from '../core/logger/core.js';
+import type { AstroIntegrationLogger, Logger } from '../core/logger/core.js';
 import { isServerLikeOutput } from '../prerender/utils.js';
 import { validateSupportedFeatures } from './astroFeaturesValidation.js';
 

packages/astro/src/runtime/client/dev-overlay/entrypoint.ts

@@ -1,5 +1,5 @@
 import type { DevOverlayPlugin as DevOverlayPluginDefinition } from '../../../@types/astro.js';
-import { type AstroDevOverlay, type DevOverlayPlugin } from './overlay.js';
+import type { AstroDevOverlay, DevOverlayPlugin } from './overlay.js';
 import { settings } from './settings.js';
 // @ts-expect-error
 import { loadDevOverlayPlugins } from 'astro:dev-overlay';

packages/astro/src/runtime/server/render/common.ts

@@ -1,7 +1,8 @@
 import type { SSRResult } from '../../../@types/astro.js';
 import type { RenderInstruction } from './instruction.js';
 
-import { HTMLBytes, HTMLString, markHTMLString } from '../escape.js';
+import type { HTMLBytes, HTMLString } from '../escape.js';
+import { markHTMLString } from '../escape.js';
 import {
 	determineIfNeedsHydrationScript,
 	determinesIfNeedsDirectiveScript,

packages/astro/src/runtime/server/render/component.ts

@@ -8,7 +8,8 @@ import { createRenderInstruction, type RenderInstruction } from './instruction.j
 
 import { clsx } from 'clsx';
 import { AstroError, AstroErrorData } from '../../../core/errors/index.js';
-import { HTMLBytes, markHTMLString } from '../escape.js';
+import type { HTMLBytes } from '../escape.js';
+import { markHTMLString } from '../escape.js';
 import { extractDirectives, generateHydrateScript } from '../hydration.js';
 import { serializeProps } from '../serialize.js';
 import { shorthash } from '../shorthash.js';

packages/astro/src/transitions/router.ts

@@ -1,10 +1,5 @@
-import {
+import type { TransitionBeforePreparationEvent, TransitionBeforeSwapEvent } from './events.js';
-	TRANSITION_AFTER_SWAP,
+import { TRANSITION_AFTER_SWAP, doPreparation, doSwap } from './events.js';
-	TransitionBeforeSwapEvent,
-	doPreparation,
-	doSwap,
-	type TransitionBeforePreparationEvent,
-} from './events.js';
 import type { Direction, Fallback, Options } from './types.js';
 
 type State = {

packages/astro/src/vite-plugin-astro/hmr.ts

@@ -1,11 +1,7 @@
 import type { HmrContext, ModuleNode } from 'vite';
 import type { AstroConfig } from '../@types/astro.js';
-import {
+import type { cachedCompilation } from '../core/compile/index.js';
-	cachedCompilation,
+import { invalidateCompilation, isCached, type CompileResult } from '../core/compile/index.js';
-	invalidateCompilation,
-	isCached,
-	type CompileResult,
-} from '../core/compile/index.js';
 import type { Logger } from '../core/logger/core.js';
 import { isAstroSrcFile } from '../core/logger/vite.js';
 import { isAstroScript } from './query.js';

packages/astro/test/i18n-routing.test.js

@@ -1,7 +1,7 @@
-import { loadFixture } from './test-utils.js';
 import { expect } from 'chai';
 import * as cheerio from 'cheerio';
 import testAdapter from './test-adapter.js';
+import { loadFixture } from './test-utils.js';
 
 describe('astro:i18n virtual module', () => {
 	/** @type {import('./test-utils').Fixture} */

packages/integrations/markdoc/components/TreeNode.ts

@@ -1,17 +1,17 @@
-import type { AstroInstance } from 'astro';
 import type { RenderableTreeNode } from '@markdoc/markdoc';
 import Markdoc from '@markdoc/markdoc';
+import type { AstroInstance } from 'astro';
+import type { HTMLString } from 'astro/runtime/server/index.js';
 import {
 	createComponent,
-	renderComponent,
-	render,
-	renderScriptElement,
-	renderUniqueStylesheet,
 	createHeadAndContent,
-	unescapeHTML,
-	renderTemplate,
-	HTMLString,
 	isHTMLString,
+	render,
+	renderComponent,
+	renderScriptElement,
+	renderTemplate,
+	renderUniqueStylesheet,
+	unescapeHTML,
 } from 'astro/runtime/server/index.js';
 
 export type TreeNode =

packages/integrations/node/src/types.ts

@@ -1,4 +1,4 @@
-import { IncomingMessage, ServerResponse } from 'node:http';
+import type { IncomingMessage, ServerResponse } from 'node:http';
 
 export interface UserOptions {
 	/**

packages/integrations/sitemap/src/index.ts

@@ -1,12 +1,8 @@
 import type { AstroConfig, AstroIntegration } from 'astro';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
-import {
+import type { EnumChangefreq, LinkItem as LinkItemBase, SitemapItemLoose } from 'sitemap';
-	EnumChangefreq,
+import { simpleSitemapAndIndex } from 'sitemap';
-	simpleSitemapAndIndex,
-	type LinkItem as LinkItemBase,
-	type SitemapItemLoose,
-} from 'sitemap';
 import { ZodError } from 'zod';
 
 import { generateSitemap } from './generate-sitemap.js';