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Next.js: Update SWC loader to support new wasm detection #33003

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Merged
yannbf merged 2 commits into from
Nov 11, 2025
+14 −3
Merged

Next.js: Update SWC loader to support new wasm detection #33003

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78d459f
Next.js: Update SWC loader to support new wasm detection
yannbf Nov 11, 2025
c5582fa
extra fix
yannbf Nov 11, 2025
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16 changes: 13 additions & 3 deletions code/frameworks/nextjs/src/swc/next-swc-loader-patch.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@ DEALINGS IN THE SOFTWARE.
import { isAbsolute, relative } from 'node:path';

import type { NextConfig } from 'next';
import { isWasm, transform } from 'next/dist/build/swc/index.js';
import * as nextSwcUtils from 'next/dist/build/swc/index.js';
import { getLoaderSWCOptions } from 'next/dist/build/swc/options.js';

export interface SWCLoaderOptions {
Expand Down Expand Up @@ -136,7 +136,7 @@ async function loaderTransform(this: any, parentTrace: any, source?: string, inp

const swcSpan = parentTrace.traceChild('next-swc-transform');
return swcSpan.traceAsyncFn(() =>
transform(source as any, programmaticOptions).then((output) => {
nextSwcUtils.transform(source as any, programmaticOptions).then((output) => {
if (output.eliminatedPackages && this.eliminatedPackages) {
for (const pkg of JSON.parse(output.eliminatedPackages)) {
this.eliminatedPackages.add(pkg);
Expand All @@ -152,14 +152,24 @@ const EXCLUDED_PATHS = /[\\/](cache[\\/][^\\/]+\.zip[\\/]node_modules|__virtual_
export function pitch(this: any) {
const callback = this.async();
(async () => {
let isWasm: boolean = false;

if (!!nextSwcUtils.isWasm) {
isWasm = await nextSwcUtils.isWasm();
// @ts-expect-error Relevant from Next.js >= 16.0.2-canary.12
} else if (!!nextSwcUtils.getBindingsSync) {
// @ts-expect-error Relevant from Next.js >= 16.0.2-canary.12
isWasm = nextSwcUtils.getBindingsSync().isWasm;
}

if (
// TODO: Evaluate if this is correct after removing pnp compatibility code in SB11
// TODO: investigate swc file reading in PnP mode?
!process.versions.pnp &&
!EXCLUDED_PATHS.test(this.resourcePath) &&
this.loaders.length - 1 === this.loaderIndex &&
isAbsolute(this.resourcePath) &&
!(await isWasm())
!isWasm
) {
const loaderSpan = mockCurrentTraceSpan.traceChild('next-swc-loader');
this.addDependency(this.resourcePath);
Expand Down
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