Function fileToBuiltUrl

packages/vite/src/node/plugins/asset.ts:425–489

* Register an asset to be emitted as part of the bundle (if necessary) * and returns the resolved public URL

(
  pluginContext: PluginContext,
  id: string,
  skipPublicCheck = false,
  forceInline?: boolean,
)

 * and returns the resolved public URL
 */
async function fileToBuiltUrl(
  pluginContext: PluginContext,
  id: string,
  skipPublicCheck = false,
  forceInline?: boolean,
): Promise<string> {
  const environment = pluginContext.environment
  const topLevelConfig = environment.getTopLevelConfig()
  if (!skipPublicCheck) {
    const publicFile = checkPublicFile(id, topLevelConfig)
    if (publicFile) {
      if (inlineRE.test(id)) {
        class="cm">// If inline via query, re-assign the id so it can be read by the fs and inlined
        id = publicFile
      } else {
        return publicFileToBuiltUrl(id, topLevelConfig)
      }
    }
  }

  const cache = assetCache.get(environment)!
  const cached = cache.get(id)
  if (cached) {
    return cached
  }

  let { file, postfix } = splitFileAndPostfix(id)
  const content = await fsp.readFile(file)

  let url: string
  if (
    shouldInline(environment, file, id, content, pluginContext, forceInline)
  ) {
    url = assetToDataURL(environment, file, content)
  } else {
    class="cm">// emit as asset
    const originalFileName = normalizePath(
      path.relative(environment.config.root, file),
    )
    const referenceId = pluginContext.emitFile({
      type: class="st">'asset',
      class="cm">// Ignore directory structure for asset file names
      name: path.basename(file),
      originalFileName,
      source: content,
    })

    if (environment.config.command === class="st">'build' && noInlineRE.test(postfix)) {
      postfix = postfix.replace(noInlineRE, class="st">'').replace(/^&/, class="st">'?')
    }

    if (
      environment.config.command === class="st">'serve' &&
      environment.config.isBundled
    ) {
      const outputFilename = pluginContext.getFileName(referenceId)
      url = toOutputFilePathInJSForBundledDev(environment, outputFilename)
    } else {