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index.js
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import path from 'path'
import { pathToFileURL } from 'url'
import { platform, arch } from 'os'
import { platformArchTriples } from 'next/dist/compiled/@napi-rs/triples'
import * as Log from '../output/log'
import { getParserOptions } from './options'
import { eventSwcLoadFailure } from '../../telemetry/events/swc-load-failure'
import { patchIncorrectLockfile } from '../../lib/patch-incorrect-lockfile'
import { downloadWasmSwc } from '../../lib/download-wasm-swc'
import { version as nextVersion } from 'next/package.json'
const ArchName = arch()
const PlatformName = platform()
const triples = platformArchTriples[PlatformName][ArchName] || []
let nativeBindings
let wasmBindings
let downloadWasmPromise
let pendingBindings
export const lockfilePatchPromise = {}
async function loadBindings() {
if (pendingBindings) {
return pendingBindings
}
pendingBindings = new Promise(async (resolve, reject) => {
if (!lockfilePatchPromise.cur) {
// always run lockfile check once so that it gets patched
// even if it doesn't fail to load locally
lockfilePatchPromise.cur = patchIncorrectLockfile(process.cwd()).catch(
console.error
)
}
let attempts = []
try {
return resolve(loadNative())
} catch (a) {
attempts = attempts.concat(a)
}
try {
let bindings = await loadWasm()
eventSwcLoadFailure({ wasm: 'enabled' })
return resolve(bindings)
} catch (a) {
attempts = attempts.concat(a)
}
try {
// if not installed already download wasm package on-demand
// we download to a custom directory instead of to node_modules
// as node_module import attempts are cached and can't be re-attempted
// x-ref: https://github.com/nodejs/modules/issues/307
const wasmDirectory = path.join(
path.dirname(require.resolve('next/package.json')),
'wasm'
)
if (!downloadWasmPromise) {
downloadWasmPromise = downloadWasmSwc(nextVersion, wasmDirectory)
}
await downloadWasmPromise
let bindings = await loadWasm(pathToFileURL(wasmDirectory).href)
eventSwcLoadFailure({ wasm: 'fallback' })
// still log native load attempts so user is
// aware it failed and should be fixed
for (const attempt of attempts) {
Log.warn(attempt)
}
return resolve(bindings)
} catch (a) {
attempts = attempts.concat(a)
}
logLoadFailure(attempts, true)
})
return pendingBindings
}
function loadBindingsSync() {
let attempts = []
try {
return loadNative()
} catch (a) {
attempts = attempts.concat(a)
}
logLoadFailure(attempts)
}
let loggingLoadFailure = false
function logLoadFailure(attempts, triedWasm = false) {
// make sure we only emit the event and log the failure once
if (loggingLoadFailure) return
loggingLoadFailure = true
for (let attempt of attempts) {
Log.warn(attempt)
}
eventSwcLoadFailure({ wasm: triedWasm ? 'failed' : undefined })
.then(() => lockfilePatchPromise.cur || Promise.resolve())
.finally(() => {
Log.error(
`Failed to load SWC binary for ${PlatformName}/${ArchName}, see more info here: https://nextjs.org/docs/messages/failed-loading-swc`
)
process.exit(1)
})
}
async function loadWasm(importPath = '') {
if (wasmBindings) {
return wasmBindings
}
let attempts = []
for (let pkg of ['@next/swc-wasm-nodejs', '@next/swc-wasm-web']) {
try {
let pkgPath = pkg
if (importPath) {
// the import path must be exact when not in node_modules
pkgPath = path.join(importPath, pkg, 'wasm.js')
}
let bindings = await import(pkgPath)
if (pkg === '@next/swc-wasm-web') {
bindings = await bindings.default()
}
Log.info('Using experimental wasm build of next-swc')
wasmBindings = {
isWasm: true,
transform(src, options) {
return Promise.resolve(
bindings.transformSync(src.toString(), options)
)
},
minify(src, options) {
return Promise.resolve(bindings.minifySync(src.toString(), options))
},
parse(src, options) {
const astStr = bindings.parseSync(src.toString(), options)
return Promise.resolve(astStr)
},
getTargetTriple() {
return undefined
},
}
return wasmBindings
} catch (e) {
// Only log attempts for loading wasm when loading as fallback
if (importPath) {
if (e?.code === 'ERR_MODULE_NOT_FOUND') {
attempts.push(`Attempted to load ${pkg}, but it was not installed`)
} else {
attempts.push(
`Attempted to load ${pkg}, but an error occurred: ${e.message ?? e}`
)
}
}
}
}
throw attempts
}
function loadNative() {
if (nativeBindings) {
return nativeBindings
}
let bindings
let attempts = []
for (const triple of triples) {
try {
bindings = require(`@next/swc/native/next-swc.${triple.platformArchABI}.node`)
Log.info('Using locally built binary of @next/swc')
break
} catch (e) {}
}
if (!bindings) {
for (const triple of triples) {
let pkg = `@next/swc-${triple.platformArchABI}`
try {
bindings = require(pkg)
break
} catch (e) {
if (e?.code === 'MODULE_NOT_FOUND') {
attempts.push(`Attempted to load ${pkg}, but it was not installed`)
} else {
attempts.push(
`Attempted to load ${pkg}, but an error occurred: ${e.message ?? e}`
)
}
}
}
}
if (bindings) {
nativeBindings = {
isWasm: false,
transform(src, options) {
const isModule =
typeof src !== undefined &&
typeof src !== 'string' &&
!Buffer.isBuffer(src)
options = options || {}
if (options?.jsc?.parser) {
options.jsc.parser.syntax = options.jsc.parser.syntax ?? 'ecmascript'
}
return bindings.transform(
isModule ? JSON.stringify(src) : src,
isModule,
toBuffer(options)
)
},
transformSync(src, options) {
if (typeof src === undefined) {
throw new Error(
"transformSync doesn't implement reading the file from filesystem"
)
} else if (Buffer.isBuffer(src)) {
throw new Error(
"transformSync doesn't implement taking the source code as Buffer"
)
}
const isModule = typeof src !== 'string'
options = options || {}
if (options?.jsc?.parser) {
options.jsc.parser.syntax = options.jsc.parser.syntax ?? 'ecmascript'
}
return bindings.transformSync(
isModule ? JSON.stringify(src) : src,
isModule,
toBuffer(options)
)
},
minify(src, options) {
return bindings.minify(toBuffer(src), toBuffer(options ?? {}))
},
minifySync(src, options) {
return bindings.minifySync(toBuffer(src), toBuffer(options ?? {}))
},
bundle(options) {
return bindings.bundle(toBuffer(options))
},
parse(src, options) {
return bindings.parse(src, toBuffer(options ?? {}))
},
getTargetTriple: bindings.getTargetTriple,
}
return nativeBindings
}
throw attempts
}
function toBuffer(t) {
return Buffer.from(JSON.stringify(t))
}
export async function isWasm() {
let bindings = await loadBindings()
return bindings.isWasm
}
export async function transform(src, options) {
let bindings = await loadBindings()
return bindings.transform(src, options)
}
export function transformSync(src, options) {
let bindings = loadBindingsSync()
return bindings.transformSync(src, options)
}
export async function minify(src, options) {
let bindings = await loadBindings()
return bindings.minify(src, options)
}
export function minifySync(src, options) {
let bindings = loadBindingsSync()
return bindings.minifySync(src, options)
}
export async function bundle(options) {
let bindings = loadBindingsSync()
return bindings.bundle(toBuffer(options))
}
export async function parse(src, options) {
let bindings = await loadBindings()
let parserOptions = getParserOptions(options)
return bindings.parse(src, parserOptions).then((astStr) => JSON.parse(astStr))
}
export function getBinaryMetadata() {
let bindings
try {
bindings = loadNative()
} catch (e) {
// Suppress exceptions, this fn allows to fail to load native bindings
}
return {
target: bindings?.getTargetTriple?.(),
}
}