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esm.mts
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esm.mts
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import { readFile } from 'fs/promises'
import { createRequire, type LoadFnOutput, type LoadHook, type ResolveFnOutput, type ResolveHook } from 'node:module'
import { extname } from 'path'
import { fileURLToPath, parse as parseUrl, pathToFileURL } from 'url'
import debugFactory from 'debug'
import ts from 'typescript'
// @ts-expect-error
import { readDefaultTsConfig } from '../lib/read-default-tsconfig.js'
// @ts-expect-error
import { AVAILABLE_TS_EXTENSION_PATTERN, compile } from '../lib/register.js'
const debug = debugFactory('@swc-node')
const tsconfig: ts.CompilerOptions = readDefaultTsConfig()
tsconfig.module = ts.ModuleKind.ESNext
const moduleResolutionCache = ts.createModuleResolutionCache(ts.sys.getCurrentDirectory(), (x) => x, tsconfig)
const host: ts.ModuleResolutionHost = {
fileExists: ts.sys.fileExists,
readFile: ts.sys.readFile,
}
const addShortCircuitSignal = <T extends ResolveFnOutput | LoadFnOutput>(input: T): T => {
return {
...input,
shortCircuit: true,
}
}
interface PackageJson {
name: string
version: string
type?: 'module' | 'commonjs'
main?: string
}
const packageJSONCache = new Map<string, undefined | PackageJson>()
const readFileIfExists = async (path: string) => {
try {
const content = await readFile(path, 'utf-8')
return JSON.parse(content)
} catch (e) {
// eslint-disable-next-line no-undef
if ((e as NodeJS.ErrnoException).code === 'ENOENT') {
return undefined
}
throw e
}
}
const readPackageJSON = async (path: string) => {
if (packageJSONCache.has(path)) {
return packageJSONCache.get(path)
}
const res = (await readFileIfExists(path)) as PackageJson
packageJSONCache.set(path, res)
return res
}
const getPackageForFile = async (url: string) => {
// use URL instead path.resolve to handle relative path
let packageJsonURL = new URL('./package.json', url)
// eslint-disable-next-line no-constant-condition
while (true) {
const path = fileURLToPath(packageJsonURL)
// for special case by some package manager
if (path.endsWith('node_modules/package.json')) {
break
}
const packageJson = await readPackageJSON(path)
if (!packageJson) {
const lastPath = packageJsonURL.pathname
packageJsonURL = new URL('../package.json', packageJsonURL)
// root level /package.json
if (packageJsonURL.pathname === lastPath) {
break
}
continue
}
if (packageJson.type && packageJson.type !== 'module' && packageJson.type !== 'commonjs') {
packageJson.type = undefined
}
return packageJson
}
return undefined
}
export const getPackageType = async (url: string) => {
const packageJson = await getPackageForFile(url)
return packageJson?.type ?? undefined
}
const INTERNAL_MODULE_PATTERN = /^(node|nodejs):/
const EXTENSION_MODULE_MAP = {
'.mjs': 'module',
'.cjs': 'commonjs',
'.ts': 'module',
'.mts': 'module',
'.cts': 'commonjs',
'.json': 'json',
'.wasm': 'wasm',
'.node': 'commonjs',
} as const
export const resolve: ResolveHook = async (specifier, context, nextResolve) => {
debug('resolve', specifier, JSON.stringify(context))
if (INTERNAL_MODULE_PATTERN.test(specifier)) {
debug('skip resolve: internal format', specifier)
return addShortCircuitSignal({
url: specifier,
format: 'builtin',
})
}
if (specifier.startsWith('data:')) {
debug('skip resolve: data url', specifier)
return addShortCircuitSignal({
url: specifier,
})
}
const parsedUrl = parseUrl(specifier)
// as entrypoint, just return specifier
if (!context.parentURL || parsedUrl.protocol === 'file:') {
debug('skip resolve: absolute path or entrypoint', specifier)
let format: ResolveFnOutput['format'] = null
const specifierPath = fileURLToPath(specifier)
const ext = extname(specifierPath)
if (ext === '.js') {
format = (await getPackageType(specifier)) === 'module' ? 'module' : 'commonjs'
} else {
format = EXTENSION_MODULE_MAP[ext as keyof typeof EXTENSION_MODULE_MAP]
}
return addShortCircuitSignal({
url: specifier,
format,
})
}
// import attributes, support json currently
if (context.importAttributes?.type) {
debug('skip resolve: import attributes', specifier)
return addShortCircuitSignal(await nextResolve(specifier))
}
const { resolvedModule } = ts.resolveModuleName(
specifier.startsWith('file:') ? fileURLToPath(specifier) : specifier,
fileURLToPath(context.parentURL),
tsconfig,
host,
moduleResolutionCache,
)
// local project file
if (
resolvedModule &&
!resolvedModule.resolvedFileName.includes('/node_modules/') &&
AVAILABLE_TS_EXTENSION_PATTERN.test(resolvedModule.resolvedFileName)
) {
debug('resolved: typescript', specifier, resolvedModule.resolvedFileName)
return addShortCircuitSignal({
...context,
url: pathToFileURL(resolvedModule.resolvedFileName).href,
format: 'module',
})
}
try {
// files could not resolved by typescript or resolved as dts, fallback to use node resolver
const res = await nextResolve(specifier)
debug('resolved: fallback node', specifier, res.url, res.format)
return addShortCircuitSignal(res)
} catch (resolveError) {
// fallback to cjs resolve as may import non-esm files
try {
const resolution = pathToFileURL(createRequire(process.cwd()).resolve(specifier)).toString()
debug('resolved: fallback commonjs', specifier, resolution)
return addShortCircuitSignal({
format: 'commonjs',
url: resolution,
})
} catch (error) {
debug('resolved by cjs error', specifier, error)
throw resolveError
}
}
}
const tsconfigForSWCNode = {
...tsconfig,
paths: undefined,
baseUrl: undefined,
}
export const load: LoadHook = async (url, context, nextLoad) => {
debug('load', url, JSON.stringify(context))
if (url.startsWith('data:')) {
debug('skip load: data url', url)
return nextLoad(url, context)
}
if (['builtin', 'json', 'wasm'].includes(context.format)) {
debug('loaded: internal format', url)
return nextLoad(url, context)
}
const { source, format: resolvedFormat } = await nextLoad(url, context)
debug('loaded', url, resolvedFormat)
const code = !source || typeof source === 'string' ? source : Buffer.from(source).toString()
const compiled = await compile(code, url, tsconfigForSWCNode, true)
debug('compiled', url, resolvedFormat)
return addShortCircuitSignal({
// for lazy: ts-node think format would undefined, actually it should not, keep it as original temporarily
format: resolvedFormat,
source: compiled,
})
}