injectSourcesContent() — vite Function Reference

Source Code

packages/vite/src/node/server/sourcemap.ts lines 35–84

export async function injectSourcesContent(
  map: SourceMapLike,
  file: string,
  logger: Logger,
): Promise<void> {
  let sourceRootPromise: Promise<string | undefined>

  const missingSources: string[] = []
  const sourcesContent = map.sourcesContent || []
  const sourcesContentPromises: Promise<void>[] = []
  for (let index = 0; index < map.sources.length; index++) {
    const sourcePath = map.sources[index]
    if (
      sourcesContent[index] == null &&
      sourcePath &&
      !virtualSourceRE.test(sourcePath)
    ) {
      sourcesContentPromises.push(
        (async () => {
          // inject content from source file when sourcesContent is null
          sourceRootPromise ??= computeSourceRoute(map, file)
          const sourceRoot = await sourceRootPromise
          let resolvedSourcePath = cleanUrl(decodeURI(sourcePath))
          if (sourceRoot) {
            resolvedSourcePath = path.resolve(sourceRoot, resolvedSourcePath)
          }

          sourcesContent[index] = await fsp
            .readFile(resolvedSourcePath, 'utf-8')
            .catch(() => {
              missingSources.push(resolvedSourcePath)
              return null
            })
        })(),
      )
    }
  }

  await Promise.all(sourcesContentPromises)

  map.sourcesContent = sourcesContent

  // Use this command…
  //    DEBUG="vite:sourcemap" vite build
  // …to log the missing sources.
  if (missingSources.length) {
    logger.warnOnce(`Sourcemap for "${file}" points to missing source files`)
    debug?.(`Missing sources:\n  ` + missingSources.join(`\n  `))
  }
}