{"id":"7f9d774cbff4f195","repo":"vitejs/vite","slug":"vite-transform-failed-for-module-url-impor","errorCode":null,"errorMessage":"[vite] transform failed for module '${url}'${importer ? ` imported from '${importer}'` : ''}.","messagePattern":"\\[vite\\] transform failed for module '(.+?)'(.+?)'` : ''\\}\\.","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/vite/src/node/ssr/fetchModule.ts","lineNumber":94,"sourceCode":"      ? 'module'\n      : 'commonjs'\n    return { externalize: file, type }\n  }\n\n  url = unwrapId(url)\n\n  const mod = await environment.moduleGraph.ensureEntryFromUrl(url)\n  const cached = !!mod.transformResult\n\n  // if url is already cached, we can just confirm it's also cached on the server\n  if (options.cached && cached) {\n    return { cache: true }\n  }\n\n  let result = await environment.transformRequest(url)\n\n  if (!result) {\n    throw new Error(\n      `[vite] transform failed for module '${url}'${\n        importer ? ` imported from '${importer}'` : ''\n      }.`,\n    )\n  }\n\n  if (options.inlineSourceMap !== false) {\n    result = inlineSourceMap(mod, result, options.startOffset)\n  }\n\n  // remove shebang\n  if (result.code[0] === '#')\n    result.code = result.code.replace(/^#!.*/, (s) => ' '.repeat(s.length))\n\n  return {\n    code: result.code,\n    file: mod.file,\n    id: mod.id!,","sourceCodeStart":76,"sourceCodeEnd":112,"githubUrl":"https://github.com/vitejs/vite/blob/89620f09afcfef6b35e7bb8660132ab5b4d0cd3b/packages/vite/src/node/ssr/fetchModule.ts#L76-L112","documentation":"Vite's fetchModule (used by the SSR/module-runner pipeline to load a module for evaluation) calls environment.transformRequest(url) and expects a non-null transform result. If the transform returns null/undefined — meaning every plugin's transform/load hook failed or returned nothing for that module — Vite cannot proceed and throws this generic transform-failure error. It is a catch-all when the pipeline produced no usable code.","triggerScenarios":"A module that is neither transformed by any plugin nor resolvable as a file causes transformRequest to return null inside fetchModule. This happens when a plugin's transform hook throws silently, a plugin returns null unexpectedly, the file is empty or has an unsupported extension with no matching loader, or the module graph entry has a stale/corrupt transformResult that was cleared.","commonSituations":"SSR with ssrLoadModule or the module runner importing a file that a custom plugin fails to handle. A plugin error during development that leaves a module in a broken state. Conflicting plugin versions after an upgrade where a transform hook signature changed. Circular imports or files with syntax errors that cause transforms to short-circuit.","solutions":["Check the Vite dev server console / error overlay for the underlying transform error from the plugin that failed — this error is a symptom, the real cause is logged above it.","Verify the module at the URL in the message actually exists and is readable; fix any syntax/import errors in that file.","Audit custom plugins: ensure their transform/load hooks either return a result or return null cleanly without throwing.","Clear node_modules/.vite cache and restart the dev server to eliminate stale transform results."],"exampleFix":"// before — a plugin that throws during transform breaks fetchModule\ntransform(code, id) {\n  return someTransformThatCanFail(code) // returns undefined on failure\n}\n\n// after — return null explicitly so Vite skips rather than produces no result\ntransform(code, id) {\n  try {\n    return { code: someTransformThatCanFail(code) }\n  } catch {\n    return null\n  }\n}","handlingStrategy":"try-catch","validationCode":"// Pre-check the module resolves before relying on fetchModule\nimport { isExternalUrl, isBuiltin } from 'vite'\n\nasync function canFetch(environment, url) {\n  try {\n    await environment.moduleGraph.ensureEntryFromUrl(url)\n    return true\n  } catch {\n    return false\n  }\n}","typeGuard":null,"tryCatchPattern":"try {\n  const result = await fetchModule(environment, url, importer)\n} catch (e) {\n  if (e instanceof Error && e.message.startsWith('[vite] transform failed')) {\n    // inspect server logs for the underlying plugin transform error\n    logger.error('Module transform failed; check plugin errors for', url)\n  } else {\n    throw e\n  }\n}","preventionTips":["Keep the dev-server console visible during SSR — the real transform error is logged above this one.","Ensure custom plugins' transform hooks never throw uncaught; return null to skip cleanly.","Invalidate/clear the module graph (.vite cache) after plugin upgrades."],"tags":["ssr","transform","module-runner","plugins"],"analyzedSha":"89620f09afcfef6b35e7bb8660132ab5b4d0cd3b","analyzedAt":"2026-08-03T19:28:02.920Z","schemaVersion":2}