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index.js
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index.js
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import { platform, arch } from 'os'
import { platformArchTriples } from 'next/dist/compiled/@napi-rs/triples'
import * as Log from '../output/log'
import { getParserOptions } from './options'
const ArchName = arch()
const PlatformName = platform()
const triples = platformArchTriples[PlatformName][ArchName] || []
let nativeBindings
let wasmBindings
let swcTraceFlushGuard
async function loadBindings() {
let attempts = []
try {
return loadNative()
} catch (a) {
attempts = attempts.concat(a)
}
try {
let bindings = await loadWasm()
return bindings
} catch (a) {
attempts = attempts.concat(a)
}
logLoadFailure(attempts)
}
function loadBindingsSync() {
let attempts = []
try {
return loadNative()
} catch (a) {
attempts = attempts.concat(a)
}
logLoadFailure(attempts)
}
function logLoadFailure(attempts) {
for (let attempt of attempts) {
Log.info(attempt)
}
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() {
if (wasmBindings) {
return wasmBindings
}
let attempts = []
for (let pkg of ['@next/swc-wasm-nodejs', '@next/swc-wasm-web']) {
try {
let bindings = await import(pkg)
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) {
return Promise.resolve(bindings.parse(src.toString(), options))
},
getTargetTriple() {
return undefined
},
}
return wasmBindings
} catch (e) {
// Do not report attempts to load wasm when it is still experimental
// 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,
initCustomTraceSubscriber: bindings.initCustomTraceSubscriber,
teardownTraceSubscriber: bindings.teardownTraceSubscriber,
}
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?.(),
}
}
/**
* Initialize trace subscriber to emit traces.
*
*/
export const initCustomTraceSubscriber = (() => {
return (filename) => {
if (!swcTraceFlushGuard) {
// Wasm binary doesn't support trace emission
let bindings = loadNative()
swcTraceFlushGuard = bindings.initCustomTraceSubscriber(filename)
}
}
})()
/**
* Teardown swc's trace subscriber if there's an initialized flush guard exists.
*
* This is workaround to amend behavior with process.exit
* (https://github.com/vercel/next.js/blob/4db8c49cc31e4fc182391fae6903fb5ef4e8c66e/packages/next/bin/next.ts#L134=)
* seems preventing napi's cleanup hook execution (https://github.com/swc-project/swc/blob/main/crates/node/src/util.rs#L48-L51=),
*
* instead parent process manually drops guard when process gets signal to exit.
*/
export const teardownTraceSubscriber = (() => {
let flushed = false
return () => {
if (!flushed) {
flushed = true
try {
let bindings = loadNative()
if (swcTraceFlushGuard) {
bindings.teardownTraceSubscriber(swcTraceFlushGuard)
}
} catch (e) {
// Suppress exceptions, this fn allows to fail to load native bindings
}
}
}
})()