fix(turbopack): keep the original sourcemap of styles after source transform

[xusd320]

Why

The original sourcemap be lost after source transform. For example, axyz.sass file processed by sass-loader, return a xyz.sass.css, the output css chunk only contains the sourcemap of xyz.sass.css produced by lightningcss, xyz.sass associated sourcemap been lost.

How

Extend lightningcss generated sourcemap with the original sourcemap, see:
https://github.com/parcel-bundler/lightningcss/blob/f2dc67c4d3fe92f26693c02366db1e60cae0db27/napi/src/lib.rs#L776

Related issue

umijs/mako#1915

[changeset-bot]

⚠️ No Changeset found

Latest commit: 15b323e

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[ijjk]

Allow CI Workflow Run

• approve CI run for commit: 15b323e

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer

[bgw]

What do you think about propagating the errors?

Because the webpack loaders are user-provided, probably the best solution here is to assume they're not guaranteed to be correct and emit some sort of non-fatal diagnostic or issue collectible of some sort, falling back to None like you're doing.

But I also think it's close enough to just assume webpack loaders emit correct source maps unless we find evidence to the contrary.

diff --git a/turbopack/crates/turbopack-css/src/process.rs b/turbopack/crates/turbopack-css/src/process.rs
index 051b30b3eb..8abee18589 100644
--- a/turbopack/crates/turbopack-css/src/process.rs
+++ b/turbopack/crates/turbopack-css/src/process.rs
@@ -96,7 +96,7 @@ impl StyleSheetLike<'_, '_> {
             debug_assert_eq!(ss.sources.len(), 1);

             if let Some(origin_source_map) = origin_source_map.as_mut() {
-                let _ = srcmap.extends(origin_source_map);
+                srcmap.extends(origin_source_map)?;
             } else {
                 srcmap.add_sources(ss.sources.clone());
                 srcmap.set_source_content(0, code)?;
@@ -266,17 +266,11 @@ pub async fn finalize_css(
                 _ => bail!("this case should be filtered out while parsing"),
             };

-            let origin_source_map = origin_source_map.await?.as_ref().map(|rope| rope.clone());
-
-            let origin_source_map = origin_source_map.as_ref().and_then(|rope| {
-                rope.to_str().ok().and_then(|cow| {
-                    if cow.is_empty() {
-                        None
-                    } else {
-                        parcel_sourcemap::SourceMap::from_json("", &cow).ok()
-                    }
-                })
-            });
+            let origin_source_map = if let Some(rope) = &*origin_source_map.await? {
+                Some(parcel_sourcemap::SourceMap::from_json("", &rope.to_str()?)?)
+            } else {
+                None
+            };

             let (result, srcmap) =
                 stylesheet.to_css(&code, minify_type, true, true, origin_source_map)?;

[ijjk]

Failing test suites

Commit: b2372e3

pnpm test-dev test/e2e/app-dir/app-basepath/index.test.ts

• app dir - basepath > should successfully hard navigate from pages -> app

Expand output

● app dir - basepath › should successfully hard navigate from pages -> app

page.waitForSelector: Timeout 10000ms exceeded.
Call log:
  - waiting for locator('#page-2')

  454 |   waitForElementByCss(selector: string, timeout = 10_000) {
  455 |     return this.startChain(async () => {
> 456 |       const el = await page.waitForSelector(selector, {
      |                             ^
  457 |         timeout,
  458 |         state: 'attached',
  459 |       })

  at waitForSelector (lib/browsers/playwright.ts:456:29)
  at Playwright._chain (lib/browsers/playwright.ts:568:23)
  at Playwright._chain [as startChain] (lib/browsers/playwright.ts:549:17)
  at Playwright.startChain [as waitForElementByCss] (lib/browsers/playwright.ts:455:17)
  at Object.waitForElementByCss (e2e/app-dir/app-basepath/index.test.ts:16:19)

Read more about building and testing Next.js in contributing.md.

__NEXT_EXPERIMENTAL_PPR=true pnpm test-dev test/e2e/socket-io/index.test.ts (PPR)

• socket-io > should support socket.io without falling back to polling

Expand output

● socket-io › should support socket.io without falling back to polling

TIMED OUT: /hello world/



undefined

  736 |
  737 |   if (hardError) {
> 738 |     throw new Error('TIMED OUT: ' + regex + '\n\n' + content + '\n\n' + lastErr)
      |           ^
  739 |   }
  740 |   return false
  741 | }

  at check (lib/next-test-utils.ts:738:11)
  at Object.<anonymous> (e2e/socket-io/index.test.ts:34:5)

Read more about building and testing Next.js in contributing.md.

pnpm test-start test/e2e/app-dir/rsc-basic/rsc-basic.test.ts

• app dir - rsc basics > should correctly render page returning null
• app dir - rsc basics > should correctly render component returning null
• app dir - rsc basics > should correctly render layout returning null
• app dir - rsc basics > should correctly render page returning undefined
• app dir - rsc basics > should correctly render component returning undefined
• app dir - rsc basics > should correctly render layout returning undefined
• app dir - rsc basics > should handle named client components imported as page
• app dir - rsc basics > should handle client components imported as namespace
• app dir - rsc basics > should render server components correctly
• app dir - rsc basics > should reuse the inline flight response without sending extra requests
• app dir - rsc basics > should support multi-level server component imports
• app dir - rsc basics > should create client reference successfully for all file conventions
• app dir - rsc basics > should be able to navigate between rsc routes
• app dir - rsc basics > should handle streaming server components correctly
• app dir - rsc basics > should track client components in dynamic imports
• app dir - rsc basics > should support next/link in server components
• app dir - rsc basics > should link correctly with next/link without mpa navigation to the page
• app dir - rsc basics > should escape streaming data correctly
• app dir - rsc basics > should render built-in 404 page for missing route if pagesDir is not presented
• app dir - rsc basics > should suspense next/legacy/image in server components
• app dir - rsc basics > should suspense next/image in server components
• app dir - rsc basics > should handle various kinds of exports correctly
• app dir - rsc basics > should support native modules in server component
• app dir - rsc basics > should resolve different kinds of components correctly
• app dir - rsc basics > should stick to the url without trailing /page suffix
• app dir - rsc basics > should support streaming for flight response
• app dir - rsc basics > should support partial hydration with inlined server data
• app dir - rsc basics > should not apply rsc syntax checks in pages/api
• app dir - rsc basics > should not use bundled react for pages with app
• app dir - rsc basics > should use canary react for app
• app dir - rsc basics > should be able to call legacy react-dom/server APIs in client components
• app dir - rsc basics > should generate edge SSR manifests for Node.js
• app dir - rsc basics > client references with TLA (edge) > should support TLA in sync client reference imports
• app dir - rsc basics > client references with TLA (edge) > should support TLA in lazy client reference
• app dir - rsc basics > client references with TLA (node) > should support TLA in sync client reference imports
• app dir - rsc basics > client references with TLA (node) > should support TLA in lazy client reference
• app dir - rsc basics > next internal shared context > should not error if just load next/navigation module in pages/api
• app dir - rsc basics > next internal shared context > should not error if just load next/router module in app page

Expand output

● app dir - rsc basics › next internal shared context › should not error if just load next/navigation module in pages/api

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › next internal shared context › should not error if just load next/router module in app page

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should correctly render page returning null

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should correctly render component returning null

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should correctly render layout returning null

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should correctly render page returning undefined

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should correctly render component returning undefined

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should correctly render layout returning undefined

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should handle named client components imported as page

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should handle client components imported as namespace

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should render server components correctly

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should reuse the inline flight response without sending extra requests

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should support multi-level server component imports

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should create client reference successfully for all file conventions

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should be able to navigate between rsc routes

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should handle streaming server components correctly

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should track client components in dynamic imports

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › client references with TLA (node) › should support TLA in sync client reference imports

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › client references with TLA (node) › should support TLA in lazy client reference

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › client references with TLA (edge) › should support TLA in sync client reference imports

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › client references with TLA (edge) › should support TLA in lazy client reference

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should support next/link in server components

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should link correctly with next/link without mpa navigation to the page

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should escape streaming data correctly

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should render built-in 404 page for missing route if pagesDir is not presented

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should suspense next/legacy/image in server components

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should suspense next/image in server components

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should handle various kinds of exports correctly

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should support native modules in server component

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should resolve different kinds of components correctly

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should stick to the url without trailing /page suffix

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should support streaming for flight response

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should support partial hydration with inlined server data

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should not apply rsc syntax checks in pages/api

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should not use bundled react for pages with app

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should use canary react for app

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should be able to call legacy react-dom/server APIs in client components

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should support partial hydration with inlined server data in browser

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

● app dir - rsc basics › should generate edge SSR manifests for Node.js

next build failed with code/signal 1

  106 |           if (code || signal)
  107 |             reject(
> 108 |               new Error(`next build failed with code/signal ${code || signal}`)
      |               ^
  109 |             )
  110 |           else resolve()
  111 |         })

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:108:15)

Read more about building and testing Next.js in contributing.md.

pnpm test-dev test/e2e/app-dir/actions/app-action.test.ts

• app-dir action handling > should forward action request to a worker that contains the action handler (node)

Expand output

● app-dir action handling › should forward action request to a worker that contains the action handler (node)

page.waitForSelector: Timeout 10000ms exceeded.
Call log:
  - waiting for locator('#other-page')

  454 |   waitForElementByCss(selector: string, timeout = 10_000) {
  455 |     return this.startChain(async () => {
> 456 |       const el = await page.waitForSelector(selector, {
      |                             ^
  457 |         timeout,
  458 |         state: 'attached',
  459 |       })

  at waitForSelector (lib/browsers/playwright.ts:456:29)
  at e2e/app-dir/actions/app-action.test.ts:908:7
  at Proxy._chain (lib/browsers/playwright.ts:568:23)
  at Proxy._chain (lib/browsers/playwright.ts:549:17)
  at Proxy.startChain (lib/browsers/playwright.ts:455:17)
  at waitForElementByCss (e2e/app-dir/actions/app-action.test.ts:911:10)

Read more about building and testing Next.js in contributing.md.

[xusd320]

@bgw I thought about propagating the errors before, choosing to fallback to None because that the soucemap correctness may not be a fatal point, it's for user experience. With falling back to None when error occurred in webpack loaders, the sourcemap generated by lightningcss will be used still.

[codspeed-hq]

CodSpeed Performance Report

Merging #79700 will not alter performance

_{Comparing umijs:fix/upstream-css-sourcemap-after-transform (b2372e3) with canary (cc3c42f)}

Summary

✅ 108 untouched benchmarks
⁉️ 9 dropped benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⁉️	/home/runner/work/next.js/next.js/turbopack/benchmark-apps/date-fns-all	2.7 s	N/A	N/A
⁉️	/home/runner/work/next.js/next.js/turbopack/benchmark-apps/date-fns-single	1.6 s	N/A	N/A
⁉️	/home/runner/work/next.js/next.js/turbopack/benchmark-apps/framer-motion-all	3.8 s	N/A	N/A
⁉️	/home/runner/work/next.js/next.js/turbopack/benchmark-apps/framer-motion-single	2.6 s	N/A	N/A
⁉️	/home/runner/work/next.js/next.js/turbopack/benchmark-apps/joy	2.5 s	N/A	N/A
⁉️	/home/runner/work/next.js/next.js/turbopack/benchmark-apps/lucide-react-all	12.5 s	N/A	N/A
⁉️	/home/runner/work/next.js/next.js/turbopack/benchmark-apps/lucide-react-single	1 s	N/A	N/A
⁉️	/home/runner/work/next.js/next.js/turbopack/benchmark-apps/mui	3.7 s	N/A	N/A
⁉️	/home/runner/work/next.js/next.js/turbopack/benchmark-apps/shiki	6.9 s	N/A	N/A

[xusd320]

Snapshots updated , and removed redundant clone and add some comments.

[xusd320]

Sorry, change my mind, propagating the errors is better, which can help webpack loader's maintainer being aware of sourcemap corruption.