/
options.ts
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/
options.ts
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/* eslint-disable no-unused-vars */
import {
ConfigEnv,
DepOptimizationOptions,
ResolvedConfig,
UserConfig,
ViteDevServer,
normalizePath
} from 'vite';
import { log } from './log';
import { loadSvelteConfig } from './load-svelte-config';
import { SVELTE_HMR_IMPORTS, SVELTE_IMPORTS, SVELTE_RESOLVE_MAIN_FIELDS } from './constants';
// eslint-disable-next-line node/no-missing-import
import type { CompileOptions, Warning } from 'svelte/types/compiler/interfaces';
import type {
MarkupPreprocessor,
Preprocessor,
PreprocessorGroup,
Processed
// eslint-disable-next-line node/no-missing-import
} from 'svelte/types/compiler/preprocess';
import path from 'path';
import { findRootSvelteDependencies, needsOptimization, SvelteDependency } from './dependencies';
import { createRequire } from 'module';
import { esbuildSveltePlugin, facadeEsbuildSveltePluginName } from './esbuild';
import { addExtraPreprocessors } from './preprocess';
import deepmerge from 'deepmerge';
const allowedPluginOptions = new Set([
'include',
'exclude',
'emitCss',
'hot',
'ignorePluginPreprocessors',
'disableDependencyReinclusion',
'experimental'
]);
const knownRootOptions = new Set(['extensions', 'compilerOptions', 'preprocess', 'onwarn']);
const allowedInlineOptions = new Set([
'configFile',
'kit', // only for internal use by sveltekit
...allowedPluginOptions,
...knownRootOptions
]);
export function validateInlineOptions(inlineOptions?: Partial<Options>) {
const invalidKeys = Object.keys(inlineOptions || {}).filter(
(key) => !allowedInlineOptions.has(key)
);
if (invalidKeys.length) {
log.warn(`invalid plugin options "${invalidKeys.join(', ')}" in inline config`, inlineOptions);
}
}
function convertPluginOptions(config?: Partial<SvelteOptions>): Partial<Options> | undefined {
if (!config) {
return;
}
const invalidRootOptions = Object.keys(config).filter((key) => allowedPluginOptions.has(key));
if (invalidRootOptions.length > 0) {
throw new Error(
`Invalid options in svelte config. Move the following options into 'vitePlugin:{...}': ${invalidRootOptions.join(
', '
)}`
);
}
if (!config.vitePlugin) {
return config;
}
const pluginOptions = config.vitePlugin;
const pluginOptionKeys = Object.keys(pluginOptions);
const rootOptionsInPluginOptions = pluginOptionKeys.filter((key) => knownRootOptions.has(key));
if (rootOptionsInPluginOptions.length > 0) {
throw new Error(
`Invalid options in svelte config under vitePlugin:{...}', move them to the config root : ${rootOptionsInPluginOptions.join(
', '
)}`
);
}
const duplicateOptions = pluginOptionKeys.filter((key) =>
Object.prototype.hasOwnProperty.call(config, key)
);
if (duplicateOptions.length > 0) {
throw new Error(
`Invalid duplicate options in svelte config under vitePlugin:{...}', they are defined in root too and must only exist once: ${duplicateOptions.join(
', '
)}`
);
}
const unknownPluginOptions = pluginOptionKeys.filter((key) => !allowedPluginOptions.has(key));
if (unknownPluginOptions.length > 0) {
log.warn(
`ignoring unknown plugin options in svelte config under vitePlugin:{...}: ${unknownPluginOptions.join(
', '
)}`
);
unknownPluginOptions.forEach((unkownOption) => {
// @ts-ignore
delete pluginOptions[unkownOption];
});
}
const result: Options = {
...config,
...pluginOptions
};
// @ts-expect-error it exists
delete result.vitePlugin;
return result;
}
// used in config phase, merges the default options, svelte config, and inline options
export async function preResolveOptions(
inlineOptions: Partial<Options> = {},
viteUserConfig: UserConfig,
viteEnv: ConfigEnv
): Promise<PreResolvedOptions> {
const viteConfigWithResolvedRoot: UserConfig = {
...viteUserConfig,
root: resolveViteRoot(viteUserConfig)
};
const defaultOptions: Partial<Options> = {
extensions: ['.svelte'],
emitCss: true
};
const svelteConfig = convertPluginOptions(
await loadSvelteConfig(viteConfigWithResolvedRoot, inlineOptions)
);
const extraOptions: Partial<PreResolvedOptions> = {
root: viteConfigWithResolvedRoot.root!,
isBuild: viteEnv.command === 'build',
isServe: viteEnv.command === 'serve',
isDebug: process.env.DEBUG != null
};
const merged = mergeConfigs<PreResolvedOptions>(
defaultOptions,
svelteConfig,
inlineOptions,
extraOptions
);
// configFile of svelteConfig contains the absolute path it was loaded from,
// prefer it over the possibly relative inline path
if (svelteConfig?.configFile) {
merged.configFile = svelteConfig.configFile;
}
return merged;
}
function mergeConfigs<T>(...configs: (Partial<T> | undefined)[]): T {
let result: Partial<T> = {};
for (const config of configs.filter((x) => x != null)) {
result = deepmerge<T>(result, config!, {
// replace arrays
arrayMerge: (target: any[], source: any[]) => source ?? target
});
}
return result as T;
}
// used in configResolved phase, merges a contextual default config, pre-resolved options, and some preprocessors.
// also validates the final config.
export function resolveOptions(
preResolveOptions: PreResolvedOptions,
viteConfig: ResolvedConfig
): ResolvedOptions {
const defaultOptions: Partial<Options> = {
hot: viteConfig.isProduction ? false : { injectCss: !preResolveOptions.emitCss },
compilerOptions: {
css: !preResolveOptions.emitCss,
dev: !viteConfig.isProduction
}
};
const extraOptions: Partial<ResolvedOptions> = {
root: viteConfig.root,
isProduction: viteConfig.isProduction
};
const merged = mergeConfigs<ResolvedOptions>(defaultOptions, preResolveOptions, extraOptions);
removeIgnoredOptions(merged);
addSvelteKitOptions(merged);
addExtraPreprocessors(merged, viteConfig);
enforceOptionsForHmr(merged);
enforceOptionsForProduction(merged);
return merged;
}
function enforceOptionsForHmr(options: ResolvedOptions) {
if (options.hot) {
if (!options.compilerOptions.dev) {
log.warn('hmr is enabled but compilerOptions.dev is false, forcing it to true');
options.compilerOptions.dev = true;
}
if (options.emitCss) {
if (options.hot !== true && options.hot.injectCss) {
log.warn('hmr and emitCss are enabled but hot.injectCss is true, forcing it to false');
options.hot.injectCss = false;
}
if (options.compilerOptions.css) {
log.warn(
'hmr and emitCss are enabled but compilerOptions.css is true, forcing it to false'
);
options.compilerOptions.css = false;
}
} else {
if (options.hot === true || !options.hot.injectCss) {
log.warn(
'hmr with emitCss disabled requires option hot.injectCss to be enabled, forcing it to true'
);
if (options.hot === true) {
options.hot = { injectCss: true };
} else {
options.hot.injectCss = true;
}
}
if (!options.compilerOptions.css) {
log.warn(
'hmr with emitCss disabled requires compilerOptions.css to be enabled, forcing it to true'
);
options.compilerOptions.css = true;
}
}
}
}
function enforceOptionsForProduction(options: ResolvedOptions) {
if (options.isProduction) {
if (options.hot) {
log.warn('options.hot is enabled but does not work on production build, forcing it to false');
options.hot = false;
}
if (options.compilerOptions.dev) {
log.warn(
'you are building for production but compilerOptions.dev is true, forcing it to false'
);
options.compilerOptions.dev = false;
}
}
}
function removeIgnoredOptions(options: ResolvedOptions) {
const ignoredCompilerOptions = ['generate', 'format', 'filename'];
if (options.hot && options.emitCss) {
ignoredCompilerOptions.push('cssHash');
}
const passedCompilerOptions = Object.keys(options.compilerOptions || {});
const passedIgnored = passedCompilerOptions.filter((o) => ignoredCompilerOptions.includes(o));
if (passedIgnored.length) {
log.warn(
`The following Svelte compilerOptions are controlled by vite-plugin-svelte and essential to its functionality. User-specified values are ignored. Please remove them from your configuration: ${passedIgnored.join(
', '
)}`
);
passedIgnored.forEach((ignored) => {
// @ts-expect-error string access
delete options.compilerOptions[ignored];
});
}
}
// some SvelteKit options need compilerOptions to work, so set them here.
function addSvelteKitOptions(options: ResolvedOptions) {
// @ts-expect-error kit is not typed to avoid dependency on sveltekit
if (options?.kit != null) {
// @ts-expect-error kit is not typed to avoid dependency on sveltekit
const kit_browser_hydrate = options.kit.browser?.hydrate;
const hydratable = kit_browser_hydrate !== false;
if (
options.compilerOptions.hydratable != null &&
options.compilerOptions.hydratable !== hydratable
) {
log.warn(
`Conflicting values "compilerOptions.hydratable: ${options.compilerOptions.hydratable}" and "kit.browser.hydrate: ${kit_browser_hydrate}" in your svelte config. You should remove "compilerOptions.hydratable".`
);
}
log.debug(`Setting compilerOptions.hydratable: ${hydratable} for SvelteKit`);
options.compilerOptions.hydratable = hydratable;
}
}
// vite passes unresolved `root`option to config hook but we need the resolved value, so do it here
// https://github.com/sveltejs/vite-plugin-svelte/issues/113
// https://github.com/vitejs/vite/blob/43c957de8a99bb326afd732c962f42127b0a4d1e/packages/vite/src/node/config.ts#L293
function resolveViteRoot(viteConfig: UserConfig): string | undefined {
return normalizePath(viteConfig.root ? path.resolve(viteConfig.root) : process.cwd());
}
export function buildExtraViteConfig(
options: PreResolvedOptions,
config: UserConfig
): Partial<UserConfig> {
// extra handling for svelte dependencies in the project
const svelteDeps = findRootSvelteDependencies(options.root);
const extraViteConfig: Partial<UserConfig> = {
resolve: {
mainFields: [...SVELTE_RESOLVE_MAIN_FIELDS],
dedupe: [...SVELTE_IMPORTS, ...SVELTE_HMR_IMPORTS]
}
// this option is still awaiting a PR in vite to be supported
// see https://github.com/sveltejs/vite-plugin-svelte/issues/60
// @ts-ignore
// knownJsSrcExtensions: options.extensions
};
extraViteConfig.optimizeDeps = buildOptimizeDepsForSvelte(
svelteDeps,
options,
config.optimizeDeps
);
if (options.experimental?.prebundleSvelteLibraries) {
extraViteConfig.optimizeDeps = {
...extraViteConfig.optimizeDeps,
// Experimental Vite API to allow these extensions to be scanned and prebundled
// @ts-ignore
extensions: options.extensions ?? ['.svelte'],
// Add esbuild plugin to prebundle Svelte files.
// Currently a placeholder as more information is needed after Vite config is resolved,
// the real Svelte plugin is added in `patchResolvedViteConfig()`
esbuildOptions: {
plugins: [{ name: facadeEsbuildSveltePluginName, setup: () => {} }]
}
};
}
// @ts-ignore
extraViteConfig.ssr = buildSSROptionsForSvelte(svelteDeps, options, config, extraViteConfig);
return extraViteConfig;
}
function buildOptimizeDepsForSvelte(
svelteDeps: SvelteDependency[],
options: PreResolvedOptions,
optimizeDeps?: DepOptimizationOptions
): DepOptimizationOptions {
// include svelte imports for optimization unless explicitly excluded
const include: string[] = [];
const exclude: string[] = ['svelte-hmr'];
const isIncluded = (dep: string) => include.includes(dep) || optimizeDeps?.include?.includes(dep);
const isExcluded = (dep: string) => {
return (
exclude.includes(dep) ||
// vite optimizeDeps.exclude works for subpackages too
// see https://github.com/vitejs/vite/blob/c87763c1418d1ba876eae13d139eba83ac6f28b2/packages/vite/src/node/optimizer/scan.ts#L293
optimizeDeps?.exclude?.some((id: string) => dep === id || id.startsWith(`${dep}/`))
);
};
if (!isExcluded('svelte')) {
const svelteImportsToInclude = SVELTE_IMPORTS.filter((x) => x !== 'svelte/ssr'); // not used on clientside
log.debug(
`adding bare svelte packages to optimizeDeps.include: ${svelteImportsToInclude.join(', ')} `
);
include.push(...svelteImportsToInclude.filter((x) => !isIncluded(x)));
} else {
log.debug('"svelte" is excluded in optimizeDeps.exclude, skipped adding it to include.');
}
// If we prebundle svelte libraries, we can skip the whole prebundling dance below
if (options.experimental?.prebundleSvelteLibraries) {
return { include, exclude };
}
// only svelte component libraries needs to be processed for optimizeDeps, js libraries work fine
svelteDeps = svelteDeps.filter((dep) => dep.type === 'component-library');
const svelteDepsToExclude = Array.from(new Set(svelteDeps.map((dep) => dep.name))).filter(
(dep) => !isIncluded(dep)
);
log.debug(`automatically excluding found svelte dependencies: ${svelteDepsToExclude.join(', ')}`);
exclude.push(...svelteDepsToExclude.filter((x) => !isExcluded(x)));
if (options.disableDependencyReinclusion !== true) {
const disabledReinclusions = options.disableDependencyReinclusion || [];
if (disabledReinclusions.length > 0) {
log.debug(`not reincluding transitive dependencies of`, disabledReinclusions);
}
const transitiveDepsToInclude = svelteDeps
.filter((dep) => !disabledReinclusions.includes(dep.name) && isExcluded(dep.name))
.flatMap((dep) => {
const localRequire = createRequire(`${dep.dir}/package.json`);
return Object.keys(dep.pkg.dependencies || {})
.filter((depOfDep) => !isExcluded(depOfDep) && needsOptimization(depOfDep, localRequire))
.map((depOfDep) => dep.path.concat(dep.name, depOfDep).join(' > '));
});
log.debug(
`reincluding transitive dependencies of excluded svelte dependencies`,
transitiveDepsToInclude
);
include.push(...transitiveDepsToInclude);
}
return { include, exclude };
}
function buildSSROptionsForSvelte(
svelteDeps: SvelteDependency[],
options: ResolvedOptions,
config: UserConfig
): any {
const noExternal: (string | RegExp)[] = [];
// add svelte to ssr.noExternal unless it is present in ssr.external
// so we can resolve it with svelte/ssr
if (!config.ssr?.external?.includes('svelte')) {
noExternal.push('svelte', /^svelte\//);
}
// add svelte dependencies to ssr.noExternal unless present in ssr.external
noExternal.push(
...Array.from(new Set(svelteDeps.map((s) => s.name))).filter(
(x) => !config.ssr?.external?.includes(x)
)
);
const ssr = {
noExternal,
external: [] as string[]
};
if (options.isServe) {
// during dev, we have to externalize transitive dependencies, see https://github.com/sveltejs/vite-plugin-svelte/issues/281
ssr.external = Array.from(
new Set(svelteDeps.flatMap((dep) => Object.keys(dep.pkg.dependencies || {})))
).filter(
(dep) =>
!ssr.noExternal.includes(dep) &&
// TODO noExternal can be something different than a string array
//!config.ssr?.noExternal?.includes(dep) &&
!config.ssr?.external?.includes(dep)
);
}
return ssr;
}
export function patchResolvedViteConfig(viteConfig: ResolvedConfig, options: ResolvedOptions) {
const facadeEsbuildSveltePlugin = viteConfig.optimizeDeps.esbuildOptions?.plugins?.find(
(plugin) => plugin.name === facadeEsbuildSveltePluginName
);
if (facadeEsbuildSveltePlugin) {
Object.assign(facadeEsbuildSveltePlugin, esbuildSveltePlugin(options));
}
}
export type Options = Omit<SvelteOptions, 'vitePlugin'> & PluginOptionsInline;
interface PluginOptionsInline extends PluginOptions {
/**
* Path to a svelte config file, either absolute or relative to Vite root
*
* set to `false` to ignore the svelte config file
*
* @see https://vitejs.dev/config/#root
*/
configFile?: string | false;
}
export interface PluginOptions {
/**
* A `picomatch` pattern, or array of patterns, which specifies the files the plugin should
* operate on. By default, all svelte files are included.
*
* @see https://github.com/micromatch/picomatch
*/
include?: Arrayable<string>;
/**
* A `picomatch` pattern, or array of patterns, which specifies the files to be ignored by the
* plugin. By default, no files are ignored.
*
* @see https://github.com/micromatch/picomatch
*/
exclude?: Arrayable<string>;
/**
* Emit Svelte styles as virtual CSS files for Vite and other plugins to process
*
* @default true
*/
emitCss?: boolean;
/**
* Enable or disable Hot Module Replacement.
*
* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*
* DO NOT CUSTOMIZE SVELTE-HMR OPTIONS UNLESS YOU KNOW EXACTLY WHAT YOU ARE DOING
*
* YOU HAVE BEEN WARNED
*
* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*
* Set an object to pass custom options to svelte-hmr
*
* @see https://github.com/rixo/svelte-hmr#options
* @default true for development, always false for production
*/
hot?: boolean | { injectCss?: boolean; [key: string]: any };
/**
* Some Vite plugins can contribute additional preprocessors by defining `api.sveltePreprocess`.
* If you don't want to use them, set this to true to ignore them all or use an array of strings
* with plugin names to specify which.
*
* @default false
*/
ignorePluginPreprocessors?: boolean | string[];
/**
* vite-plugin-svelte automatically handles excluding svelte libraries and reinclusion of their dependencies
* in vite.optimizeDeps.
*
* `disableDependencyReinclusion: true` disables all reinclusions
* `disableDependencyReinclusion: ['foo','bar']` disables reinclusions for dependencies of foo and bar
*
* This should be used for hybrid packages that contain both node and browser dependencies, eg Routify
*
* @default false
*/
disableDependencyReinclusion?: boolean | string[];
/**
* These options are considered experimental and breaking changes to them can occur in any release
*/
experimental?: ExperimentalOptions;
}
export interface SvelteOptions {
/**
* A list of file extensions to be compiled by Svelte
*
* @default ['.svelte']
*/
extensions?: string[];
/**
* An array of preprocessors to transform the Svelte source code before compilation
*
* @see https://svelte.dev/docs#svelte_preprocess
*/
preprocess?: Arrayable<PreprocessorGroup>;
/**
* The options to be passed to the Svelte compiler. A few options are set by default,
* including `dev` and `css`. However, some options are non-configurable, like
* `filename`, `format`, `generate`, and `cssHash` (in dev).
*
* @see https://svelte.dev/docs#svelte_compile
*/
compilerOptions?: Omit<CompileOptions, 'filename' | 'format' | 'generate'>;
/**
* Handles warning emitted from the Svelte compiler
*/
onwarn?: (warning: Warning, defaultHandler?: (warning: Warning) => void) => void;
/**
* Options for vite-plugin-svelte
*/
vitePlugin?: PluginOptions;
}
/**
* These options are considered experimental and breaking changes to them can occur in any release
*/
export interface ExperimentalOptions {
/**
* Use extra preprocessors that delegate style and TypeScript preprocessing to native Vite plugins
*
* Do not use together with `svelte-preprocess`!
*
* @default false
*/
useVitePreprocess?: boolean;
/**
* Force Vite to pre-bundle Svelte libraries
*
* @default false
*/
prebundleSvelteLibraries?: boolean;
/**
* If a preprocessor does not provide a sourcemap, a best-effort fallback sourcemap will be provided.
* This option requires `diff-match-patch` to be installed as a peer dependency.
*
* @see https://github.com/google/diff-match-patch
* @default false
*/
generateMissingPreprocessorSourcemaps?: boolean;
/**
* A function to update `compilerOptions` before compilation
*
* `data.filename` - The file to be compiled
* `data.code` - The preprocessed Svelte code
* `data.compileOptions` - The current compiler options
*
* To change part of the compiler options, return an object with the changes you need.
*
* @example
* ```
* ({ filename, compileOptions }) => {
* // Dynamically set hydration per Svelte file
* if (compileWithHydratable(filename) && !compileOptions.hydratable) {
* return { hydratable: true };
* }
* }
* ```
*/
dynamicCompileOptions?: (data: {
filename: string;
code: string;
compileOptions: Partial<CompileOptions>;
}) => Promise<Partial<CompileOptions> | void> | Partial<CompileOptions> | void;
/**
* enable svelte inspector
*/
inspector?: InspectorOptions | boolean;
/**
* send a websocket message with svelte compiler warnings during dev
*
*/
sendWarningsToBrowser?: boolean;
}
export interface InspectorOptions {
/**
* define a key combo to toggle inspector,
* @default 'control-shift' on windows, 'meta-shift' on other os
*
* any number of modifiers `control` `shift` `alt` `meta` followed by zero or one regular key, separated by -
* examples: control-shift, control-o, control-alt-s meta-x control-meta
* Some keys have native behavior (e.g. alt-s opens history menu on firefox).
* To avoid conflicts or accidentally typing into inputs, modifier only combinations are recommended.
*/
toggleKeyCombo?: string;
/**
* inspector is automatically disabled when releasing toggleKeyCombo after holding it for a longpress
* @default false
*/
holdMode?: boolean;
/**
* when to show the toggle button
* @default 'active'
*/
showToggleButton?: 'always' | 'active' | 'never';
/**
* where to display the toggle button
* @default top-right
*/
toggleButtonPos?: 'top-right' | 'top-left' | 'bottom-right' | 'bottom-left';
/**
* inject custom styles when inspector is active
*/
customStyles?: boolean;
/**
* append an import to the module id ending with `appendTo` instead of adding a script into body
* useful for frameworks that do not support trannsformIndexHtml hook
*
* WARNING: only set this if you know exactly what it does.
* Regular users of vite-plugin-svelte or SvelteKit do not need it
*/
appendTo?: string;
}
export interface PreResolvedOptions extends Options {
// these options are non-nullable after resolve
compilerOptions: CompileOptions;
experimental?: ExperimentalOptions;
// extra options
root: string;
isBuild: boolean;
isServe: boolean;
isDebug: boolean;
}
export interface ResolvedOptions extends PreResolvedOptions {
isProduction: boolean;
server?: ViteDevServer;
}
export type {
CompileOptions,
Processed,
MarkupPreprocessor,
Preprocessor,
PreprocessorGroup,
Warning
};
export type ModuleFormat = NonNullable<CompileOptions['format']>;
export type CssHashGetter = NonNullable<CompileOptions['cssHash']>;
export type Arrayable<T> = T | T[];