Function createLoadHandler

packages/vite/src/node/optimizer/pluginConverter.ts:253–301

(
  options: esbuild.OnLoadOptions,
  callback: EsbuildOnLoadCallback,
)

}

function createLoadHandler(
  options: esbuild.OnLoadOptions,
  callback: EsbuildOnLoadCallback,
): LoadHandler {
  const textDecoder = new TextDecoder()
  return async function (id) {
    const [idWithoutNamespace, idNamespace] = idToPathAndNamespace(id)
    if (
      options.namespace !== undefined &&
      options.namespace !== 'file' &&
      options.namespace !== idNamespace
    ) {
      return
    }
    if (options.filter !== undefined && !options.filter.test(id)) {
      return
    }

    const result = await callback.call(this, {
      path: idWithoutNamespace,
      namespace: idNamespace,
      suffix: '',
      pluginData: {},
      with: {},
    })
    if (!result) return
    if (result.errors && result.errors.length > 0) {
      throw new AggregateError(result.errors)
    }
    if (
      (result.warnings && result.warnings.length > 0) ||
      (result.watchDirs && result.watchDirs.length > 0) ||
      result.contents == null
    ) {
      throw new Error('not implemented')
    }
    for (const file of result.watchFiles ?? []) {
      this.addWatchFile(file)
    }

    return {
      code:
        typeof result.contents === 'string'
          ? result.contents
          : textDecoder.decode(result.contents),
      moduleType: result.loader,
    }
  }
}

function idToPathAndNamespace(id: string): [path: string, namespace: string]
function idToPathAndNamespace(