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resolver.mts
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resolver.mts
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/**
* @file resolver
* @module mlly/lib/resolver
*/
import chars from '#internal/chars'
import checkInvalidSegments from '#internal/check-invalid-segments'
import dfs from '#internal/fs'
import invalidPackageTarget from '#internal/invalid-package-target'
import invalidSubpath from '#internal/invalid-subpath'
import canParseUrl from '#lib/can-parse-url'
import defaultConditions from '#lib/default-conditions'
import defaultMainFields from '#lib/default-main-fields'
import isArrayIndex from '#lib/is-array-index'
import isDirectory from '#lib/is-directory'
import isFile from '#lib/is-file'
import isImportsSubpath from '#lib/is-imports-subpath'
import isRelativeSpecifier from '#lib/is-relative-specifier'
import lookupPackageScope from '#lib/lookup-package-scope'
import patternMatch from '#lib/pattern-match'
import readPackageJson from '#lib/read-package-json'
import root from '#lib/root'
import toUrl from '#lib/to-url'
import {
codes,
ERR_INVALID_MODULE_SPECIFIER,
ERR_INVALID_PACKAGE_CONFIG,
ERR_MODULE_NOT_FOUND,
ERR_PACKAGE_IMPORT_NOT_DEFINED,
ERR_PACKAGE_PATH_NOT_EXPORTED,
ERR_UNSUPPORTED_DIR_IMPORT,
ERR_UNSUPPORTED_RESOLVE_REQUEST,
type ErrInvalidModuleSpecifier,
type ErrInvalidPackageConfig,
type ErrInvalidPackageTarget,
type ErrModuleNotFound,
type ErrPackageImportNotDefined,
type ErrPackagePathNotExported,
type ErrUnsupportedDirImport,
type ErrUnsupportedResolveRequest,
type NodeError
} from '@flex-development/errnode'
import { isBuiltin } from '@flex-development/is-builtin'
import type {
FileSystem,
MainField,
ModuleId,
PatternMatch
} from '@flex-development/mlly'
import pathe from '@flex-development/pathe'
import type {
Condition,
ConditionalTargets,
Exports,
ExportsObject,
Imports,
JsonValue,
PackageJson,
Target,
TargetList
} from '@flex-development/pkg-types'
import { ok } from 'devlop'
declare module '@flex-development/errnode' {
interface ErrUnsupportedDirImport {
/**
* Directory URL.
*/
url?: string | null | undefined
}
}
export {
legacyMainResolve,
legacyMainResolveSync,
moduleResolve,
moduleResolveSync,
packageExportsResolve,
packageExportsResolveSync,
packageImportsExportsResolve,
packageImportsExportsResolveSync,
packageImportsResolve,
packageImportsResolveSync,
packageResolve,
packageResolveSync,
packageSelfResolve,
packageSelfResolveSync,
packageTargetResolve,
packageTargetResolveSync
}
/**
* Resolve the [`main`][main] package entry point using the legacy CommonJS
* resolution algorithm.
*
* [main]: https://github.com/nodejs/node/blob/v22.9.0/doc/api/packages.md#main
*
* @see {@linkcode ErrModuleNotFound}
* @see {@linkcode FileSystem}
* @see {@linkcode MainField}
* @see {@linkcode ModuleId}
* @see {@linkcode PackageJson}
*
* @async
*
* @param {ModuleId} packageUrl
* URL of package directory, `package.json` file, or module in the same
* directory as a `package.json` file
* @param {PackageJson | null | undefined} [manifest]
* Package manifest
* @param {MainField[] | Set<MainField> | null | undefined} [mainFields]
* List of legacy main fields
* @param {ModuleId | null | undefined} [parent]
* URL of parent module
* @param {FileSystem | null | undefined} [fs]
* File system API
* @return {Promise<URL>}
* Resolved URL
* @throws {ErrModuleNotFound}
*/
async function legacyMainResolve(
packageUrl: ModuleId,
manifest?: PackageJson | null | undefined,
mainFields?: MainField[] | Set<MainField> | null | undefined,
parent?: ModuleId | null | undefined,
fs?: FileSystem | null | undefined
): Promise<URL> {
return new Promise(resolve => {
return void resolve(legacyMainResolveSync(
packageUrl,
manifest,
mainFields,
parent,
fs
))
})
}
/**
* Resolve the [`main`][main] package entry point using the legacy CommonJS
* resolution algorithm.
*
* [main]: https://github.com/nodejs/node/blob/v22.9.0/doc/api/packages.md#main
*
* @see {@linkcode ErrModuleNotFound}
* @see {@linkcode FileSystem}
* @see {@linkcode MainField}
* @see {@linkcode ModuleId}
* @see {@linkcode PackageJson}
*
* @param {ModuleId} packageUrl
* URL of package directory, `package.json` file, or module in the same
* directory as a `package.json` file
* @param {PackageJson | null | undefined} [manifest]
* Package manifest
* @param {MainField[] | Set<MainField> | null | undefined} [mainFields]
* List of legacy main fields
* @param {ModuleId | null | undefined} [parent]
* URL of parent module
* @param {FileSystem | null | undefined} [fs]
* File system API
* @return {URL}
* Resolved URL
* @throws {ErrModuleNotFound}
*/
function legacyMainResolveSync(
packageUrl: ModuleId,
manifest?: PackageJson | null | undefined,
mainFields?: MainField[] | Set<MainField> | null | undefined,
parent?: ModuleId | null | undefined,
fs?: FileSystem | null | undefined
): URL {
if (manifest) {
for (const field of mainFields ?? defaultMainFields) {
/**
* Possible inputs for package entry point URL.
*
* @const {string[]} tries
*/
const tries: string[] = []
/**
* Main field value.
*
* @const {JsonValue} value
*/
const value: JsonValue | undefined = manifest[field]
/**
* Resolved URL.
*
* @var {URL | null} resolved
*/
let resolved: URL | null = null
if (typeof value === 'string') {
tries.push(
value,
`./${value}.js`,
`./${value}.json`,
`./${value}.node`,
`./${value}/index.js`,
`./${value}/index.json`,
`./${value}/index.node`
)
}
tries.push('./index.js', './index.json', './index.node')
for (const input of tries) {
resolved = new URL(input, packageUrl)
if (isFile(resolved, fs)) return resolved
}
}
}
throw new ERR_MODULE_NOT_FOUND(
pathe.fileURLToPath(packageUrl),
parent && pathe.fileURLToPath(parent)
)
}
/**
* Resolve a module `specifier`.
*
* Implements the `MODULE_RESOLVE` (`ESM_RESOLVE`) algorithm.
*
* @see {@linkcode Condition}
* @see {@linkcode ErrInvalidModuleSpecifier}
* @see {@linkcode ErrModuleNotFound}
* @see {@linkcode ErrUnsupportedDirImport}
* @see {@linkcode FileSystem}
* @see {@linkcode ModuleId}
* @see https://github.com/nodejs/node/blob/v22.9.0/doc/api/esm.md#resolution-algorithm
*
* @async
*
* @param {string} specifier
* Module specifier to resolve
* @param {ModuleId} parent
* URL of parent module
* @param {Condition[] | Set<Condition> | null | undefined} [conditions]
* List of export/import conditions
* @param {MainField[] | Set<MainField> | null | undefined} [mainFields]
* List of legacy main fields
* @param {boolean | null | undefined} [preserveSymlinks]
* Keep symlinks instead of resolving them
* @param {FileSystem | null | undefined} [fs]
* File system API
* @return {Promise<URL>}
* Resolved URL
* @throws {ErrInvalidModuleSpecifier}
* @throws {ErrModuleNotFound}
* @throws {ErrUnsupportedDirImport}
*/
async function moduleResolve(
specifier: string,
parent: ModuleId,
conditions?: Condition[] | Set<Condition> | null | undefined,
mainFields?: MainField[] | Set<MainField> | null | undefined,
preserveSymlinks?: boolean | null | undefined,
fs?: FileSystem | null | undefined
): Promise<URL> {
return new Promise(resolve => {
return void resolve(moduleResolveSync(
specifier,
parent,
conditions,
mainFields,
preserveSymlinks,
fs
))
})
}
/**
* Resolve a module `specifier`.
*
* Implements the `MODULE_RESOLVE` (`ESM_RESOLVE`) algorithm.
*
* @see {@linkcode Condition}
* @see {@linkcode ErrInvalidModuleSpecifier}
* @see {@linkcode ErrModuleNotFound}
* @see {@linkcode ErrUnsupportedDirImport}
* @see {@linkcode FileSystem}
* @see {@linkcode ModuleId}
* @see https://github.com/nodejs/node/blob/v22.9.0/doc/api/esm.md#resolution-algorithm
*
* @param {string} specifier
* Module specifier to resolve
* @param {ModuleId} parent
* URL of parent module
* @param {Condition[] | Set<Condition> | null | undefined} [conditions]
* List of export/import conditions
* @param {MainField[] | Set<MainField> | null | undefined} [mainFields]
* List of legacy main fields
* @param {boolean | null | undefined} [preserveSymlinks]
* Keep symlinks instead of resolving them
* @param {FileSystem | null | undefined} [fs]
* File system API
* @return {URL}
* Resolved URL
* @throws {ErrInvalidModuleSpecifier}
* @throws {ErrModuleNotFound}
* @throws {ErrUnsupportedDirImport}
*/
function moduleResolveSync(
specifier: string,
parent: ModuleId,
conditions?: Condition[] | Set<Condition> | null | undefined,
mainFields?: MainField[] | Set<MainField> | null | undefined,
preserveSymlinks?: boolean | null | undefined,
fs?: FileSystem | null | undefined
): URL {
/**
* URL protocol of parent module.
*
* @const {string} protocol
*/
const protocol: string = typeof parent === 'string'
? parent.slice(0, parent.indexOf(':') + 1)
: parent.protocol
/**
* Resolved URL.
*
* @var {URL} resolved
*/
let resolved: URL
if (pathe.isAbsolute(specifier) || isRelativeSpecifier(specifier)) {
try {
resolved = new URL(specifier, parent)
} catch (e: unknown) {
/**
* Node error.
*
* @var {ErrUnsupportedResolveRequest} error
*/
let error: ErrUnsupportedResolveRequest
error = new ERR_UNSUPPORTED_RESOLVE_REQUEST(String(specifier), parent)
error.cause = e
throw error
}
} else if (protocol === 'file:' && isImportsSubpath(specifier)) {
resolved = packageImportsResolveSync(
specifier,
parent,
conditions,
mainFields,
fs
)
} else {
try {
resolved = new URL(specifier)
} catch (e: unknown) {
if (protocol === 'data:' && !isBuiltin(specifier)) {
/**
* Node error.
*
* @var {ErrUnsupportedResolveRequest} error
*/
let error: ErrUnsupportedResolveRequest
error = new ERR_UNSUPPORTED_RESOLVE_REQUEST(String(specifier), parent)
error.cause = e
throw error
}
resolved = packageResolveSync(
specifier,
parent,
conditions,
mainFields,
fs
)
}
}
ok(resolved, 'expected `resolved` to be a URL')
if (resolved.protocol === 'file:') {
const { hash, pathname, search } = resolved
if (/%2f|%5c/i.test(pathname)) {
throw new ERR_INVALID_MODULE_SPECIFIER(
pathname,
'must not include encoded "/" or "\\" characters',
pathe.fileURLToPath(parent)
)
}
if (isDirectory(resolved, fs)) {
/**
* Node error.
*
* @var {ErrUnsupportedDirImport} error
*/
let error: ErrUnsupportedDirImport
error = new ERR_UNSUPPORTED_DIR_IMPORT(
pathname,
pathe.fileURLToPath(parent)
)
error.url = String(resolved)
throw error
}
if (!isFile(resolved, fs)) {
throw new ERR_MODULE_NOT_FOUND(
pathname,
pathe.fileURLToPath(parent),
resolved
)
}
if (!preserveSymlinks) {
fs ??= dfs
resolved = new URL(pathe.pathToFileURL(fs.realpathSync(resolved)))
resolved.hash = hash
resolved.search = search
}
}
return resolved
}
/**
* Resolve a package export.
*
* Implements the `PACKAGE_EXPORTS_RESOLVE` algorithm.
*
* @see {@linkcode Condition}
* @see {@linkcode ErrInvalidPackageConfig}
* @see {@linkcode ErrPackagePathNotExported}
* @see {@linkcode Exports}
* @see {@linkcode FileSystem}
* @see {@linkcode Imports}
* @see {@linkcode ModuleId}
* @see https://github.com/nodejs/node/blob/v22.9.0/doc/api/esm.md#resolution-algorithm
*
* @async
*
* @param {ModuleId} packageUrl
* URL of package directory, `package.json` file, or module in the same
* directory as a `package.json` file
* @param {string} subpath
* Package subpath to resolve
* @param {Exports | undefined} exports
* Package exports
* @param {Condition[] | Set<Condition> | null | undefined} [conditions]
* List of export/import conditions
* @param {ModuleId | null | undefined} [parent]
* URL of parent module
* @param {FileSystem | null | undefined} [fs]
* File system API
* @return {Promise<URL>}
* Resolved URL
* @throws {ErrInvalidPackageConfig}
* @throws {ErrPackagePathNotExported}
*/
async function packageExportsResolve(
packageUrl: ModuleId,
subpath: string,
exports: Exports | undefined,
conditions?: Condition[] | Set<Condition> | null | undefined,
parent?: ModuleId | null | undefined,
fs?: FileSystem | null | undefined
): Promise<URL> {
return new Promise(resolve => {
return void resolve(packageExportsResolveSync(
packageUrl,
subpath,
exports,
conditions,
parent,
fs
))
})
}
/**
* Resolve a package export.
*
* Implements the `PACKAGE_EXPORTS_RESOLVE` algorithm.
*
* @see {@linkcode Condition}
* @see {@linkcode ErrInvalidPackageConfig}
* @see {@linkcode ErrPackagePathNotExported}
* @see {@linkcode Exports}
* @see {@linkcode FileSystem}
* @see {@linkcode Imports}
* @see {@linkcode ModuleId}
* @see https://github.com/nodejs/node/blob/v22.9.0/doc/api/esm.md#resolution-algorithm
*
* @param {ModuleId} packageUrl
* URL of package directory, `package.json` file, or module in the same
* directory as a `package.json` file
* @param {string} subpath
* Package subpath to resolve
* @param {Exports | undefined} exports
* Package exports
* @param {Condition[] | Set<Condition> | null | undefined} [conditions]
* List of export/import conditions
* @param {ModuleId | null | undefined} [parent]
* URL of parent module
* @param {FileSystem | null | undefined} [fs]
* File system API
* @return {URL}
* Resolved URL
* @throws {ErrInvalidPackageConfig}
* @throws {ErrPackagePathNotExported}
*/
function packageExportsResolveSync(
packageUrl: ModuleId,
subpath: string,
exports: Exports | undefined,
conditions?: Condition[] | Set<Condition> | null | undefined,
parent?: ModuleId | null | undefined,
fs?: FileSystem | null | undefined
): URL {
if (exports) {
/**
* Boolean indicating all {@linkcode exports} object keys must start with a
* dot character (`'.'`).
*
* @var {boolean} dot
*/
let dot: boolean = false
if (!Array.isArray(exports) && typeof exports === 'object') {
for (const [i, key] of Object.getOwnPropertyNames(exports).entries()) {
/**
* Boolean indicating the current {@linkcode exports} key starts with a
* dot character (`'.'`).
*
* @var {boolean} dotStart
*/
let dotStart: boolean = key[0] === pathe.dot
if (i === 0) {
dot = dotStart
continue
}
// throw if keys of `exports` are not all conditions or all subpaths
if (dot !== dotStart) {
throw new ERR_INVALID_PACKAGE_CONFIG(
pathe.fileURLToPath(new URL('package.json', packageUrl)),
parent,
'"exports" cannot contain some keys starting' +
' starting with \'.\' and some not.' +
' The exports object must either be an object of package subpath keys or an object of main entry condition name keys only.'
)
}
}
}
/**
* Resolved package export URL.
*
* @var {URL | null | undefined} resolved
*/
let resolved: URL | null | undefined = null
if (subpath === pathe.dot) {
/**
* Main package target.
*
* @var {Exports | undefined} mainExport
*/
let mainExport: Exports | undefined
if (Array.isArray(exports) || typeof exports === 'string' || !dot) {
mainExport = exports
} else if (Object.prototype.hasOwnProperty.call(exports, subpath)) {
mainExport = exports[pathe.dot]
}
if (mainExport !== undefined) {
resolved = packageTargetResolveSync(
packageUrl,
mainExport,
subpath,
null,
false,
conditions,
null,
parent,
fs
)
}
} else if (typeof exports === 'object' && dot) {
ok(!Array.isArray(exports), 'expected `exports` to not be an array')
ok(subpath.startsWith('./'), 'expected `subpath` to start with "./"')
resolved = packageImportsExportsResolveSync(
subpath,
exports,
packageUrl,
false,
conditions,
null,
parent,
fs
)
}
if (resolved) return resolved
}
throw new ERR_PACKAGE_PATH_NOT_EXPORTED(
pathe.fileURLToPath(packageUrl),
subpath,
parent && pathe.fileURLToPath(parent)
)
}
/**
* Resolve a package export or import.
*
* Implements the `PACKAGE_IMPORTS_EXPORTS_RESOLVE` algorithm.
*
* @see {@linkcode Condition}
* @see {@linkcode ExportsObject}
* @see {@linkcode FileSystem}
* @see {@linkcode Imports}
* @see {@linkcode ModuleId}
* @see https://github.com/nodejs/node/blob/v22.9.0/doc/api/esm.md#resolution-algorithm
*
* @async
*
* @param {string} matchKey
* Package subpath from module specifier or dot character (`'.'`)
* @param {ExportsObject | Imports | null | undefined} matchObject
* Package exports object or imports
* @param {ModuleId} packageUrl
* URL of directory containing `package.json` file
* @param {boolean | null | undefined} [isImports]
* Whether `matchObject` is internal to the package
* @param {Condition[] | Set<Condition> | null | undefined} [conditions]
* List of export/import conditions
* @param {MainField[] | Set<MainField> | null | undefined} [mainFields]
* List of legacy main fields
* @param {ModuleId | null | undefined} [parent]
* URL of parent module
* @param {FileSystem | null | undefined} [fs]
* File system API
* @return {Promise<URL | null | undefined>}
* Resolved URL
*/
async function packageImportsExportsResolve(
matchKey: string,
matchObject: ExportsObject | Imports | null | undefined,
packageUrl: ModuleId,
isImports?: boolean | null | undefined,
conditions?: Condition[] | Set<Condition> | null | undefined,
mainFields?: MainField[] | Set<MainField> | null | undefined,
parent?: ModuleId | null | undefined,
fs?: FileSystem | null | undefined
): Promise<URL | null | undefined> {
return new Promise(resolve => {
return void resolve(packageImportsExportsResolveSync(
matchKey,
matchObject,
packageUrl,
isImports,
conditions,
mainFields,
parent,
fs
))
})
}
/**
* Resolve a package export or import.
*
* Implements the `PACKAGE_IMPORTS_EXPORTS_RESOLVE` algorithm.
*
* @see {@linkcode Condition}
* @see {@linkcode ExportsObject}
* @see {@linkcode FileSystem}
* @see {@linkcode Imports}
* @see {@linkcode ModuleId}
* @see https://github.com/nodejs/node/blob/v22.9.0/doc/api/esm.md#resolution-algorithm
*
* @param {string} matchKey
* Package subpath from module specifier or dot character (`'.'`)
* @param {ExportsObject | Imports | null | undefined} matchObject
* Package exports object or imports
* @param {ModuleId} packageUrl
* URL of directory containing `package.json` file
* @param {boolean | null | undefined} [isImports]
* Whether `matchObject` is internal to the package
* @param {Condition[] | Set<Condition> | null | undefined} [conditions]
* List of export/import conditions
* @param {MainField[] | Set<MainField> | null | undefined} [mainFields]
* List of legacy main fields
* @param {ModuleId | null | undefined} [parent]
* URL of parent module
* @param {FileSystem | null | undefined} [fs]
* File system API
* @return {URL | null | undefined}
* Resolved URL
*/
function packageImportsExportsResolveSync(
matchKey: string,
matchObject: ExportsObject | Imports | null | undefined,
packageUrl: ModuleId,
isImports?: boolean | null | undefined,
conditions?: Condition[] | Set<Condition> | null | undefined,
mainFields?: MainField[] | Set<MainField> | null | undefined,
parent?: ModuleId | null | undefined,
fs?: FileSystem | null | undefined
): URL | null | undefined {
if (typeof matchObject === 'object' && matchObject) {
/**
* List containing expansion key and subpath pattern match.
*
* @const {PatternMatch | null} match
*/
const match: PatternMatch | null = patternMatch(matchKey, matchObject)
if (match) {
return packageTargetResolveSync(
packageUrl,
matchObject[match[0]],
...match,
isImports,
conditions,
mainFields,
parent,
fs
)
}
}
return null
}
/**
* Resolve a package import.
*
* Implements the `PACKAGE_IMPORTS_RESOLVE` algorithm.
*
* @see {@linkcode Condition}
* @see {@linkcode ErrInvalidModuleSpecifier}
* @see {@linkcode ErrPackageImportNotDefined}
* @see {@linkcode FileSystem}
* @see {@linkcode ModuleId}
* @see https://github.com/nodejs/node/blob/v22.9.0/doc/api/esm.md#resolution-algorithm
*
* @async
*
* @param {string} specifier
* The import specifier to resolve
* @param {ModuleId} parent
* URL of parent module
* @param {Condition[] | Set<Condition> | null | undefined} [conditions]
* List of export/import conditions
* @param {MainField[] | Set<MainField> | null | undefined} [mainFields]
* List of legacy main fields
* @param {FileSystem | null | undefined} [fs]
* File system API
* @return {Promise<URL>}
* Resolved URL
* @throws {ErrInvalidModuleSpecifier}
* @throws {ErrPackageImportNotDefined}
*/
async function packageImportsResolve(
specifier: string,
parent: ModuleId,
conditions?: Condition[] | Set<Condition> | null | undefined,
mainFields?: MainField[] | Set<MainField> | null | undefined,
fs?: FileSystem | null | undefined
): Promise<URL> {
return new Promise(resolve => {
return void resolve(packageImportsResolveSync(
specifier,
parent,
conditions,
mainFields,
fs
))
})
}
/**
* Resolve a package import.
*
* Implements the `PACKAGE_IMPORTS_RESOLVE` algorithm.
*
* @see {@linkcode Condition}
* @see {@linkcode ErrInvalidModuleSpecifier}
* @see {@linkcode ErrPackageImportNotDefined}
* @see {@linkcode FileSystem}
* @see {@linkcode ModuleId}
* @see https://github.com/nodejs/node/blob/v22.9.0/doc/api/esm.md#resolution-algorithm
*
* @param {string} specifier
* The import specifier to resolve
* @param {ModuleId} parent
* URL of parent module
* @param {Condition[] | Set<Condition> | null | undefined} [conditions]
* List of export/import conditions
* @param {MainField[] | Set<MainField> | null | undefined} [mainFields]
* List of legacy main fields
* @param {FileSystem | null | undefined} [fs]
* File system API
* @return {URL}
* Resolved URL
* @throws {ErrInvalidModuleSpecifier}
* @throws {ErrPackageImportNotDefined}
*/
function packageImportsResolveSync(
specifier: string,
parent: ModuleId,
conditions?: Condition[] | Set<Condition> | null | undefined,
mainFields?: MainField[] | Set<MainField> | null | undefined,
fs?: FileSystem | null | undefined
): URL {
if (
!specifier.startsWith(chars.hash) ||
specifier === chars.hash ||
specifier.startsWith(chars.hash + pathe.sep)
) {
throw new ERR_INVALID_MODULE_SPECIFIER(
specifier,
'is not a valid internal imports specifier name',
pathe.fileURLToPath(parent)
)
}
/**
* URL of directory containing `package.json` file.
*
* @const {URL | null} packageUrl
*/
const packageUrl: URL | null = lookupPackageScope(parent, null, fs)
if (packageUrl) {
/**
* Package manifest.
*
* @const {PackageJson | null} pjson
*/
const pjson: PackageJson | null = readPackageJson(
packageUrl,
specifier,
parent,
fs
)
if (pjson) {
/**
* Resolved package import URL.
*
* @const {URL | null | undefined} resolved
*/
const resolved: URL | null | undefined = packageImportsExportsResolveSync(
specifier,
pjson.imports,
packageUrl,
true,
conditions,
mainFields,
parent,
fs
)
if (resolved) return resolved
}
}
throw new ERR_PACKAGE_IMPORT_NOT_DEFINED(
specifier,
packageUrl && pathe.fileURLToPath(packageUrl),
pathe.fileURLToPath(parent)
)
}
/**
* Resolve a *bare specifier*.
*
* > *Bare specifiers* like `'some-package'` or `'some-package/shuffle'` refer
* > to the main entry point of a package by package name, or a specific feature
* > module within a package prefixed by the package name. Including the file
* > extension is only necessary for packages without an [`"exports"`][exports]
* > field.
*
* Implements the `PACKAGE_RESOLVE` algorithm.
*
* [exports]: https://nodejs.org/api/packages.html#exports
*
* @see {@linkcode Condition}
* @see {@linkcode ErrInvalidModuleSpecifier}
* @see {@linkcode ErrModuleNotFound}
* @see {@linkcode FileSystem}
* @see {@linkcode MainField}
* @see {@linkcode ModuleId}
* @see https://github.com/nodejs/node/blob/v22.9.0/doc/api/esm.md#resolution-algorithm
*
* @async
*
* @param {string} specifier
* The package specifier to resolve
* @param {ModuleId} parent
* Id of module to resolve `packageSpecifier` against
* @param {Condition[] | Set<Condition> | null | undefined} [conditions]
* List of export/import conditions
* @param {MainField[] | Set<MainField> | null | undefined} [mainFields]
* List of legacy main fields
* @param {FileSystem | null | undefined} [fs]
* File system API
* @return {Promise<URL>}
* Resolved URL
* @throws {ErrInvalidModuleSpecifier}
* @throws {ErrModuleNotFound}
*/
async function packageResolve(
specifier: string,
parent: ModuleId,
conditions?: Condition[] | Set<Condition> | null | undefined,
mainFields?: MainField[] | Set<MainField> | null | undefined,
fs?: FileSystem | null | undefined
): Promise<URL> {
return new Promise(resolve => {
return void resolve(packageResolveSync(
specifier,
parent,
conditions,
mainFields,
fs
))
})
}
/**
* Resolve a *bare specifier*.
*
* > *Bare specifiers* like `'some-package'` or `'some-package/shuffle'` refer
* > to the main entry point of a package by package name, or a specific feature
* > module within a package prefixed by the package name. Including the file
* > extension is only necessary for packages without an [`"exports"`][exports]
* > field.
*
* Implements the `PACKAGE_RESOLVE` algorithm.
*
* [exports]: https://nodejs.org/api/packages.html#exports
*
* @see {@linkcode Condition}
* @see {@linkcode ErrInvalidModuleSpecifier}
* @see {@linkcode ErrModuleNotFound}
* @see {@linkcode FileSystem}
* @see {@linkcode MainField}
* @see {@linkcode ModuleId}
* @see https://github.com/nodejs/node/blob/v22.9.0/doc/api/esm.md#resolution-algorithm
*
* @param {string} specifier
* The package specifier to resolve
* @param {ModuleId} parent
* Id of module to resolve `packageSpecifier` against
* @param {Condition[] | Set<Condition> | null | undefined} [conditions]
* List of export/import conditions
* @param {MainField[] | Set<MainField> | null | undefined} [mainFields]
* List of legacy main fields
* @param {FileSystem | null | undefined} [fs]
* File system API
* @return {URL}
* Resolved URL
* @throws {ErrInvalidModuleSpecifier}
* @throws {ErrModuleNotFound}
*/
function packageResolveSync(
specifier: string,
parent: ModuleId,
conditions?: Condition[] | Set<Condition> | null | undefined,
mainFields?: MainField[] | Set<MainField> | null | undefined,
fs?: FileSystem | null | undefined
): URL {
if (isBuiltin(specifier)) return toUrl(specifier)
/**
* Index of separator in {@linkcode specifier}.
*
* @var {number} separatorIndex
*/
let separatorIndex: number = -1
/**
* Boolean indicating valid package name.
*
* @var {boolean} validPackageName
*/