/
resolve.ts
1256 lines (1140 loc) · 36.5 KB
/
resolve.ts
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import fs from 'node:fs'
import path from 'node:path'
import colors from 'picocolors'
import type { PartialResolvedId } from 'rollup'
import { exports, imports } from 'resolve.exports'
import { hasESMSyntax } from 'mlly'
import type { Plugin } from '../plugin'
import {
CLIENT_ENTRY,
DEFAULT_EXTENSIONS,
DEFAULT_MAIN_FIELDS,
DEP_VERSION_RE,
ENV_ENTRY,
FS_PREFIX,
OPTIMIZABLE_ENTRY_RE,
SPECIAL_QUERY_RE,
} from '../constants'
import {
bareImportRE,
cleanUrl,
createDebugger,
deepImportRE,
fsPathFromId,
injectQuery,
isBuiltin,
isDataUrl,
isExternalUrl,
isInNodeModules,
isNonDriveRelativeAbsolutePath,
isObject,
isOptimizable,
isTsRequest,
isWindows,
normalizePath,
safeRealpathSync,
slash,
tryStatSync,
} from '../utils'
import { optimizedDepInfoFromFile, optimizedDepInfoFromId } from '../optimizer'
import type { DepsOptimizer } from '../optimizer'
import type { SSROptions } from '..'
import type { PackageCache, PackageData } from '../packages'
import {
findNearestMainPackageData,
findNearestPackageData,
loadPackageData,
resolvePackageData,
} from '../packages'
const normalizedClientEntry = normalizePath(CLIENT_ENTRY)
const normalizedEnvEntry = normalizePath(ENV_ENTRY)
// special id for paths marked with browser: false
// https://github.com/defunctzombie/package-browser-field-spec#ignore-a-module
export const browserExternalId = '__vite-browser-external'
// special id for packages that are optional peer deps
export const optionalPeerDepId = '__vite-optional-peer-dep'
const subpathImportsPrefix = '#'
const startsWithWordCharRE = /^\w/
const debug = createDebugger('vite:resolve-details', {
onlyWhenFocused: true,
})
export interface ResolveOptions {
/**
* @default ['module', 'jsnext:main', 'jsnext']
*/
mainFields?: string[]
/**
* @deprecated In future, `mainFields` should be used instead.
* @default true
*/
browserField?: boolean
conditions?: string[]
/**
* @default ['.mjs', '.js', '.mts', '.ts', '.jsx', '.tsx', '.json']
*/
extensions?: string[]
dedupe?: string[]
/**
* @default false
*/
preserveSymlinks?: boolean
}
export interface InternalResolveOptions extends Required<ResolveOptions> {
root: string
isBuild: boolean
isProduction: boolean
ssrConfig?: SSROptions
packageCache?: PackageCache
/**
* src code mode also attempts the following:
* - resolving /xxx as URLs
* - resolving bare imports from optimized deps
*/
asSrc?: boolean
tryIndex?: boolean
tryPrefix?: string
preferRelative?: boolean
isRequire?: boolean
// #3040
// when the importer is a ts module,
// if the specifier requests a non-existent `.js/jsx/mjs/cjs` file,
// should also try import from `.ts/tsx/mts/cts` source file as fallback.
isFromTsImporter?: boolean
tryEsmOnly?: boolean
// True when resolving during the scan phase to discover dependencies
scan?: boolean
// Appends ?__vite_skip_optimization to the resolved id if shouldn't be optimized
ssrOptimizeCheck?: boolean
// Resolve using esbuild deps optimization
getDepsOptimizer?: (ssr: boolean) => DepsOptimizer | undefined
shouldExternalize?: (id: string) => boolean | undefined
}
export function resolvePlugin(resolveOptions: InternalResolveOptions): Plugin {
const {
root,
isProduction,
asSrc,
ssrConfig,
preferRelative = false,
} = resolveOptions
const { target: ssrTarget, noExternal: ssrNoExternal } = ssrConfig ?? {}
// In unix systems, absolute paths inside root first needs to be checked as an
// absolute URL (/root/root/path-to-file) resulting in failed checks before falling
// back to checking the path as absolute. If /root/root isn't a valid path, we can
// avoid these checks. Absolute paths inside root are common in user code as many
// paths are resolved by the user. For example for an alias.
const rootInRoot = tryStatSync(path.join(root, root))?.isDirectory() ?? false
return {
name: 'vite:resolve',
async resolveId(id, importer, resolveOpts) {
if (
id[0] === '\0' ||
id.startsWith('virtual:') ||
// When injected directly in html/client code
id.startsWith('/virtual:')
) {
return
}
const ssr = resolveOpts?.ssr === true
// We need to delay depsOptimizer until here instead of passing it as an option
// the resolvePlugin because the optimizer is created on server listen during dev
const depsOptimizer = resolveOptions.getDepsOptimizer?.(ssr)
if (id.startsWith(browserExternalId)) {
return id
}
const targetWeb = !ssr || ssrTarget === 'webworker'
// this is passed by @rollup/plugin-commonjs
const isRequire: boolean =
resolveOpts?.custom?.['node-resolve']?.isRequire ?? false
const options: InternalResolveOptions = {
isRequire,
...resolveOptions,
scan: resolveOpts?.scan ?? resolveOptions.scan,
}
const resolvedImports = resolveSubpathImports(
id,
importer,
options,
targetWeb,
)
if (resolvedImports) {
id = resolvedImports
}
if (importer) {
if (
isTsRequest(importer) ||
resolveOpts.custom?.depScan?.loader?.startsWith('ts')
) {
options.isFromTsImporter = true
} else {
const moduleLang = this.getModuleInfo(importer)?.meta?.vite?.lang
options.isFromTsImporter = moduleLang && isTsRequest(`.${moduleLang}`)
}
}
let res: string | PartialResolvedId | undefined
// resolve pre-bundled deps requests, these could be resolved by
// tryFileResolve or /fs/ resolution but these files may not yet
// exists if we are in the middle of a deps re-processing
if (asSrc && depsOptimizer?.isOptimizedDepUrl(id)) {
const optimizedPath = id.startsWith(FS_PREFIX)
? fsPathFromId(id)
: normalizePath(path.resolve(root, id.slice(1)))
return optimizedPath
}
// explicit fs paths that starts with /@fs/*
if (asSrc && id.startsWith(FS_PREFIX)) {
res = fsPathFromId(id)
// We don't need to resolve these paths since they are already resolved
// always return here even if res doesn't exist since /@fs/ is explicit
// if the file doesn't exist it should be a 404.
debug?.(`[@fs] ${colors.cyan(id)} -> ${colors.dim(res)}`)
return ensureVersionQuery(res, id, options, depsOptimizer)
}
// URL
// /foo -> /fs-root/foo
if (asSrc && id[0] === '/' && (rootInRoot || !id.startsWith(root))) {
const fsPath = path.resolve(root, id.slice(1))
if ((res = tryFsResolve(fsPath, options))) {
debug?.(`[url] ${colors.cyan(id)} -> ${colors.dim(res)}`)
return ensureVersionQuery(res, id, options, depsOptimizer)
}
}
// relative
if (
id[0] === '.' ||
((preferRelative || importer?.endsWith('.html')) &&
startsWithWordCharRE.test(id))
) {
const basedir = importer ? path.dirname(importer) : process.cwd()
const fsPath = path.resolve(basedir, id)
// handle browser field mapping for relative imports
const normalizedFsPath = normalizePath(fsPath)
if (depsOptimizer?.isOptimizedDepFile(normalizedFsPath)) {
// Optimized files could not yet exist in disk, resolve to the full path
// Inject the current browserHash version if the path doesn't have one
if (!normalizedFsPath.match(DEP_VERSION_RE)) {
const browserHash = optimizedDepInfoFromFile(
depsOptimizer.metadata,
normalizedFsPath,
)?.browserHash
if (browserHash) {
return injectQuery(normalizedFsPath, `v=${browserHash}`)
}
}
return normalizedFsPath
}
if (
targetWeb &&
options.browserField &&
(res = tryResolveBrowserMapping(fsPath, importer, options, true))
) {
return res
}
if ((res = tryFsResolve(fsPath, options))) {
const resPkg = findNearestPackageData(
path.dirname(res),
options.packageCache,
)
res = ensureVersionQuery(res, id, options, depsOptimizer)
debug?.(`[relative] ${colors.cyan(id)} -> ${colors.dim(res)}`)
return resPkg
? {
id: res,
moduleSideEffects: resPkg.hasSideEffects(res),
}
: res
}
}
// drive relative fs paths (only windows)
if (isWindows && id[0] === '/') {
const basedir = importer ? path.dirname(importer) : process.cwd()
const fsPath = path.resolve(basedir, id)
if ((res = tryFsResolve(fsPath, options))) {
debug?.(`[drive-relative] ${colors.cyan(id)} -> ${colors.dim(res)}`)
return ensureVersionQuery(res, id, options, depsOptimizer)
}
}
// absolute fs paths
if (
isNonDriveRelativeAbsolutePath(id) &&
(res = tryFsResolve(id, options))
) {
debug?.(`[fs] ${colors.cyan(id)} -> ${colors.dim(res)}`)
return ensureVersionQuery(res, id, options, depsOptimizer)
}
// external
if (isExternalUrl(id)) {
return {
id,
external: true,
}
}
// data uri: pass through (this only happens during build and will be
// handled by dedicated plugin)
if (isDataUrl(id)) {
return null
}
// bare package imports, perform node resolve
if (bareImportRE.test(id)) {
const external = options.shouldExternalize?.(id)
if (
!external &&
asSrc &&
depsOptimizer &&
!options.scan &&
(res = await tryOptimizedResolve(
depsOptimizer,
id,
importer,
options.preserveSymlinks,
options.packageCache,
))
) {
return res
}
if (
targetWeb &&
options.browserField &&
(res = tryResolveBrowserMapping(
id,
importer,
options,
false,
external,
))
) {
return res
}
if (
(res = tryNodeResolve(
id,
importer,
options,
targetWeb,
depsOptimizer,
ssr,
external,
))
) {
return res
}
// node built-ins.
// externalize if building for SSR, otherwise redirect to empty module
if (isBuiltin(id)) {
if (ssr) {
if (ssrNoExternal === true) {
let message = `Cannot bundle Node.js built-in "${id}"`
if (importer) {
message += ` imported from "${path.relative(
process.cwd(),
importer,
)}"`
}
message += `. Consider disabling ssr.noExternal or remove the built-in dependency.`
this.error(message)
}
return {
id,
external: true,
}
} else {
if (!asSrc) {
debug?.(
`externalized node built-in "${id}" to empty module. ` +
`(imported by: ${colors.white(colors.dim(importer))})`,
)
}
return isProduction
? browserExternalId
: `${browserExternalId}:${id}`
}
}
}
debug?.(`[fallthrough] ${colors.dim(id)}`)
},
load(id) {
if (id.startsWith(browserExternalId)) {
if (isProduction) {
return `export default {}`
} else {
id = id.slice(browserExternalId.length + 1)
return `\
export default new Proxy({}, {
get(_, key) {
throw new Error(\`Module "${id}" has been externalized for browser compatibility. Cannot access "${id}.\${key}" in client code. See http://vitejs.dev/guide/troubleshooting.html#module-externalized-for-browser-compatibility for more details.\`)
}
})`
}
}
if (id.startsWith(optionalPeerDepId)) {
if (isProduction) {
return `export default {}`
} else {
const [, peerDep, parentDep] = id.split(':')
return `throw new Error(\`Could not resolve "${peerDep}" imported by "${parentDep}". Is it installed?\`)`
}
}
},
}
}
function resolveSubpathImports(
id: string,
importer: string | undefined,
options: InternalResolveOptions,
targetWeb: boolean,
) {
if (!importer || !id.startsWith(subpathImportsPrefix)) return
const basedir = path.dirname(importer)
const pkgData = findNearestPackageData(basedir, options.packageCache)
if (!pkgData) return
let importsPath = resolveExportsOrImports(
pkgData.data,
id,
options,
targetWeb,
'imports',
)
if (importsPath?.[0] === '.') {
importsPath = path.relative(basedir, path.join(pkgData.dir, importsPath))
if (importsPath[0] !== '.') {
importsPath = `./${importsPath}`
}
}
return importsPath
}
function ensureVersionQuery(
resolved: string,
id: string,
options: InternalResolveOptions,
depsOptimizer?: DepsOptimizer,
): string {
if (
!options.isBuild &&
!options.scan &&
depsOptimizer &&
!(resolved === normalizedClientEntry || resolved === normalizedEnvEntry)
) {
// Ensure that direct imports of node_modules have the same version query
// as if they would have been imported through a bare import
// Use the original id to do the check as the resolved id may be the real
// file path after symlinks resolution
const isNodeModule = isInNodeModules(id) || isInNodeModules(resolved)
if (isNodeModule && !resolved.match(DEP_VERSION_RE)) {
const versionHash = depsOptimizer.metadata.browserHash
if (versionHash && isOptimizable(resolved, depsOptimizer.options)) {
resolved = injectQuery(resolved, `v=${versionHash}`)
}
}
}
return resolved
}
function splitFileAndPostfix(path: string) {
const file = cleanUrl(path)
return { file, postfix: path.slice(file.length) }
}
function tryFsResolve(
fsPath: string,
options: InternalResolveOptions,
tryIndex = true,
targetWeb = true,
skipPackageJson = false,
): string | undefined {
// Dependencies like es5-ext use `#` in their paths. We don't support `#` in user
// source code so we only need to perform the check for dependencies.
// We don't support `?` in node_modules paths, so we only need to check in this branch.
const hashIndex = fsPath.indexOf('#')
if (hashIndex >= 0 && isInNodeModules(fsPath)) {
const queryIndex = fsPath.indexOf('?')
// We only need to check foo#bar?baz and foo#bar, ignore foo?bar#baz
if (queryIndex < 0 || queryIndex > hashIndex) {
const file = queryIndex > hashIndex ? fsPath.slice(0, queryIndex) : fsPath
const res = tryCleanFsResolve(
file,
options,
tryIndex,
targetWeb,
skipPackageJson,
)
if (res) return res + fsPath.slice(file.length)
}
}
const { file, postfix } = splitFileAndPostfix(fsPath)
const res = tryCleanFsResolve(
file,
options,
tryIndex,
targetWeb,
skipPackageJson,
)
if (res) return res + postfix
}
const knownTsOutputRE = /\.(?:js|mjs|cjs|jsx)$/
const isPossibleTsOutput = (url: string): boolean => knownTsOutputRE.test(url)
function tryCleanFsResolve(
file: string,
options: InternalResolveOptions,
tryIndex = true,
targetWeb = true,
skipPackageJson = false,
): string | undefined {
const { tryPrefix, extensions, preserveSymlinks } = options
const fileStat = tryStatSync(file)
// Try direct match first
if (fileStat?.isFile()) return getRealPath(file, options.preserveSymlinks)
let res: string | undefined
// If path.dirname is a valid directory, try extensions and ts resolution logic
const possibleJsToTs = options.isFromTsImporter && isPossibleTsOutput(file)
if (possibleJsToTs || extensions.length || tryPrefix) {
const dirPath = path.dirname(file)
const dirStat = tryStatSync(dirPath)
if (dirStat?.isDirectory()) {
if (possibleJsToTs) {
// try resolve .js, .mjs, .cjs or .jsx import to typescript file
const fileExt = path.extname(file)
const fileName = file.slice(0, -fileExt.length)
if (
(res = tryResolveRealFile(
fileName + fileExt.replace('js', 'ts'),
preserveSymlinks,
))
)
return res
// for .js, also try .tsx
if (
fileExt === '.js' &&
(res = tryResolveRealFile(fileName + '.tsx', preserveSymlinks))
)
return res
}
if (
(res = tryResolveRealFileWithExtensions(
file,
extensions,
preserveSymlinks,
))
)
return res
if (tryPrefix) {
const prefixed = `${dirPath}/${options.tryPrefix}${path.basename(file)}`
if ((res = tryResolveRealFile(prefixed, preserveSymlinks))) return res
if (
(res = tryResolveRealFileWithExtensions(
prefixed,
extensions,
preserveSymlinks,
))
)
return res
}
}
}
if (tryIndex && fileStat) {
// Path points to a directory, check for package.json and entry and /index file
const dirPath = file
if (!skipPackageJson) {
let pkgPath = `${dirPath}/package.json`
try {
if (fs.existsSync(pkgPath)) {
if (!options.preserveSymlinks) {
pkgPath = safeRealpathSync(pkgPath)
}
// path points to a node package
const pkg = loadPackageData(pkgPath)
return resolvePackageEntry(dirPath, pkg, targetWeb, options)
}
} catch (e) {
if (e.code !== 'ENOENT') throw e
}
}
if (
(res = tryResolveRealFileWithExtensions(
`${dirPath}/index`,
extensions,
preserveSymlinks,
))
)
return res
if (tryPrefix) {
if (
(res = tryResolveRealFileWithExtensions(
`${dirPath}/${options.tryPrefix}index`,
extensions,
preserveSymlinks,
))
)
return res
}
}
}
function tryResolveRealFile(
file: string,
preserveSymlinks: boolean,
): string | undefined {
const stat = tryStatSync(file)
if (stat?.isFile()) return getRealPath(file, preserveSymlinks)
}
function tryResolveRealFileWithExtensions(
filePath: string,
extensions: string[],
preserveSymlinks: boolean,
): string | undefined {
for (const ext of extensions) {
const res = tryResolveRealFile(filePath + ext, preserveSymlinks)
if (res) return res
}
}
export type InternalResolveOptionsWithOverrideConditions =
InternalResolveOptions & {
/**
* @deprecated In future, `conditions` will work like this.
* @internal
*/
overrideConditions?: string[]
}
export function tryNodeResolve(
id: string,
importer: string | null | undefined,
options: InternalResolveOptionsWithOverrideConditions,
targetWeb: boolean,
depsOptimizer?: DepsOptimizer,
ssr: boolean = false,
externalize?: boolean,
allowLinkedExternal: boolean = true,
): PartialResolvedId | undefined {
const { root, dedupe, isBuild, preserveSymlinks, packageCache } = options
// check for deep import, e.g. "my-lib/foo"
const deepMatch = id.match(deepImportRE)
const pkgId = deepMatch ? deepMatch[1] || deepMatch[2] : id
let basedir: string
if (dedupe?.includes(pkgId)) {
basedir = root
} else if (
importer &&
path.isAbsolute(importer) &&
fs.existsSync(cleanUrl(importer))
) {
basedir = path.dirname(importer)
} else {
basedir = root
}
const pkg = resolvePackageData(pkgId, basedir, preserveSymlinks, packageCache)
if (!pkg) {
// if import can't be found, check if it's an optional peer dep.
// if so, we can resolve to a special id that errors only when imported.
if (
basedir !== root && // root has no peer dep
!isBuiltin(id) &&
!id.includes('\0') &&
bareImportRE.test(id)
) {
const mainPkg = findNearestMainPackageData(basedir, packageCache)?.data
if (mainPkg) {
if (
mainPkg.peerDependencies?.[id] &&
mainPkg.peerDependenciesMeta?.[id]?.optional
) {
return {
id: `${optionalPeerDepId}:${id}:${mainPkg.name}`,
}
}
}
}
return
}
const resolveId = deepMatch ? resolveDeepImport : resolvePackageEntry
const unresolvedId = deepMatch ? '.' + id.slice(pkgId.length) : pkgId
let resolved: string | undefined
try {
resolved = resolveId(unresolvedId, pkg, targetWeb, options)
} catch (err) {
if (!options.tryEsmOnly) {
throw err
}
}
if (!resolved && options.tryEsmOnly) {
resolved = resolveId(unresolvedId, pkg, targetWeb, {
...options,
isRequire: false,
mainFields: DEFAULT_MAIN_FIELDS,
extensions: DEFAULT_EXTENSIONS,
})
}
if (!resolved) {
return
}
const processResult = (resolved: PartialResolvedId) => {
if (!externalize) {
return resolved
}
// don't external symlink packages
if (!allowLinkedExternal && !isInNodeModules(resolved.id)) {
return resolved
}
const resolvedExt = path.extname(resolved.id)
// don't external non-js imports
if (
resolvedExt &&
resolvedExt !== '.js' &&
resolvedExt !== '.mjs' &&
resolvedExt !== '.cjs'
) {
return resolved
}
let resolvedId = id
if (deepMatch && !pkg?.data.exports && path.extname(id) !== resolvedExt) {
resolvedId = resolved.id.slice(resolved.id.indexOf(id))
debug?.(`[processResult] ${colors.cyan(id)} -> ${colors.dim(resolvedId)}`)
}
return { ...resolved, id: resolvedId, external: true }
}
if ((isBuild && !depsOptimizer) || externalize) {
// Resolve package side effects for build so that rollup can better
// perform tree-shaking
return processResult({
id: resolved,
moduleSideEffects: pkg.hasSideEffects(resolved),
})
}
const ext = path.extname(resolved)
if (
!options.ssrOptimizeCheck &&
(!isInNodeModules(resolved) || // linked
!depsOptimizer || // resolving before listening to the server
options.scan) // initial esbuild scan phase
) {
return { id: resolved }
}
// if we reach here, it's a valid dep import that hasn't been optimized.
const isJsType = depsOptimizer
? isOptimizable(resolved, depsOptimizer.options)
: OPTIMIZABLE_ENTRY_RE.test(resolved)
let exclude = depsOptimizer?.options.exclude
let include = depsOptimizer?.options.include
if (options.ssrOptimizeCheck) {
// we don't have the depsOptimizer
exclude = options.ssrConfig?.optimizeDeps?.exclude
include = options.ssrConfig?.optimizeDeps?.include
}
const skipOptimization =
!isJsType ||
(importer && isInNodeModules(importer)) ||
exclude?.includes(pkgId) ||
exclude?.includes(id) ||
SPECIAL_QUERY_RE.test(resolved) ||
// During dev SSR, we don't have a way to reload the module graph if
// a non-optimized dep is found. So we need to skip optimization here.
// The only optimized deps are the ones explicitly listed in the config.
(!options.ssrOptimizeCheck && !isBuild && ssr) ||
// Only optimize non-external CJS deps during SSR by default
(ssr &&
!(
ext === '.cjs' ||
(ext === '.js' &&
findNearestPackageData(path.dirname(resolved), options.packageCache)
?.data.type !== 'module')
) &&
!(include?.includes(pkgId) || include?.includes(id)))
if (options.ssrOptimizeCheck) {
return {
id: skipOptimization
? injectQuery(resolved, `__vite_skip_optimization`)
: resolved,
}
}
if (skipOptimization) {
// excluded from optimization
// Inject a version query to npm deps so that the browser
// can cache it without re-validation, but only do so for known js types.
// otherwise we may introduce duplicated modules for externalized files
// from pre-bundled deps.
if (!isBuild) {
const versionHash = depsOptimizer!.metadata.browserHash
if (versionHash && isJsType) {
resolved = injectQuery(resolved, `v=${versionHash}`)
}
}
} else {
// this is a missing import, queue optimize-deps re-run and
// get a resolved its optimized info
const optimizedInfo = depsOptimizer!.registerMissingImport(id, resolved)
resolved = depsOptimizer!.getOptimizedDepId(optimizedInfo)
}
if (isBuild) {
// Resolve package side effects for build so that rollup can better
// perform tree-shaking
return {
id: resolved,
moduleSideEffects: pkg.hasSideEffects(resolved),
}
} else {
return { id: resolved! }
}
}
export async function tryOptimizedResolve(
depsOptimizer: DepsOptimizer,
id: string,
importer?: string,
preserveSymlinks?: boolean,
packageCache?: PackageCache,
): Promise<string | undefined> {
// TODO: we need to wait until scanning is done here as this function
// is used in the preAliasPlugin to decide if an aliased dep is optimized,
// and avoid replacing the bare import with the resolved path.
// We should be able to remove this in the future
await depsOptimizer.scanProcessing
const metadata = depsOptimizer.metadata
const depInfo = optimizedDepInfoFromId(metadata, id)
if (depInfo) {
return depsOptimizer.getOptimizedDepId(depInfo)
}
if (!importer) return
// further check if id is imported by nested dependency
let idPkgDir: string | undefined
const nestedIdMatch = `> ${id}`
for (const optimizedData of metadata.depInfoList) {
if (!optimizedData.src) continue // Ignore chunks
// check where "foo" is nested in "my-lib > foo"
if (!optimizedData.id.endsWith(nestedIdMatch)) continue
// lazily initialize idPkgDir
if (idPkgDir == null) {
idPkgDir = resolvePackageData(
id,
importer,
preserveSymlinks,
packageCache,
)?.dir
// if still null, it likely means that this id isn't a dep for importer.
// break to bail early
if (idPkgDir == null) break
idPkgDir = normalizePath(idPkgDir)
}
// match by src to correctly identify if id belongs to nested dependency
if (optimizedData.src.startsWith(idPkgDir)) {
return depsOptimizer.getOptimizedDepId(optimizedData)
}
}
}
export function resolvePackageEntry(
id: string,
{ dir, data, setResolvedCache, getResolvedCache }: PackageData,
targetWeb: boolean,
options: InternalResolveOptions,
): string | undefined {
const cached = getResolvedCache('.', targetWeb)
if (cached) {
return cached
}
try {
let entryPoint: string | undefined
// resolve exports field with highest priority
// using https://github.com/lukeed/resolve.exports
if (data.exports) {
entryPoint = resolveExportsOrImports(
data,
'.',
options,
targetWeb,
'exports',
)
}
const resolvedFromExports = !!entryPoint
// if exports resolved to .mjs, still resolve other fields.
// This is because .mjs files can technically import .cjs files which would
// make them invalid for pure ESM environments - so if other module/browser
// fields are present, prioritize those instead.
if (
targetWeb &&
options.browserField &&
(!entryPoint || entryPoint.endsWith('.mjs'))
) {
// check browser field
// https://github.com/defunctzombie/package-browser-field-spec
const browserEntry =
typeof data.browser === 'string'
? data.browser
: isObject(data.browser) && data.browser['.']
if (browserEntry) {
// check if the package also has a "module" field.
if (
!options.isRequire &&
options.mainFields.includes('module') &&
typeof data.module === 'string' &&
data.module !== browserEntry
) {
// if both are present, we may have a problem: some package points both
// to ESM, with "module" targeting Node.js, while some packages points
// "module" to browser ESM and "browser" to UMD/IIFE.
// the heuristics here is to actually read the browser entry when
// possible and check for hints of ESM. If it is not ESM, prefer "module"
// instead; Otherwise, assume it's ESM and use it.
const resolvedBrowserEntry = tryFsResolve(
path.join(dir, browserEntry),
options,
)
if (resolvedBrowserEntry) {
const content = fs.readFileSync(resolvedBrowserEntry, 'utf-8')
if (hasESMSyntax(content)) {
// likely ESM, prefer browser
entryPoint = browserEntry
} else {
// non-ESM, UMD or IIFE or CJS(!!! e.g. firebase 7.x), prefer module
entryPoint = data.module
}
}
} else {
entryPoint = browserEntry
}
}
}
// fallback to mainFields if still not resolved
// TODO: review if `.mjs` check is still needed
if (!resolvedFromExports && (!entryPoint || entryPoint.endsWith('.mjs'))) {
for (const field of options.mainFields) {
if (field === 'browser') continue // already checked above
if (typeof data[field] === 'string') {
entryPoint = data[field]
break
}
}
}
entryPoint ||= data.main
// try default entry when entry is not define