{"record":{"id":"da599adf6c5991f3","repo":"appsmithorg/appsmith","slug":"failed-to-generate-autocomplete-definitions-for","errorCode":null,"errorMessage":"Failed to generate autocomplete definitions for ${name}.","messagePattern":"Failed to generate autocomplete definitions for (.+?)\\.","errorType":"exception","errorClass":"TernDefinitionError","httpStatus":null,"severity":"error","filePath":"app/client/src/workers/Evaluation/handlers/jsLibrary.ts","lineNumber":239,"sourceCode":"    if (accessors.length === 0) {\n      throw new Error(\"Unable to determine a unique accessor\");\n    }\n\n    // Name of the library is the last accessor. This is totally random and needs fixing.\n    const name = accessors[accessors.length - 1];\n\n    defs[\"!name\"] = `LIB/${name}`;\n    try {\n      for (const key of accessors) {\n        defs[key] = makeTernDefs(self[key]);\n      }\n    } catch (e) {\n      for (const acc of accessors) {\n        self[acc] = undefined;\n      }\n\n      log.debug(e, `ternDefinitions failed for ${url}`);\n      throw new TernDefinitionError(\n        `Failed to generate autocomplete definitions: ${name}`,\n      );\n    }\n\n    // Restore the libraries from libStore to the global scope.\n    // This is done to ensure that the libraries are not overwritten by the newly installed library.\n    Object.keys(libStore).forEach((k) => (self[k] = libStore[k]));\n\n    //Reserve accessor names.\n    for (const acc of accessors) {\n      //we have to update invalidEntityIdentifiers as well\n      libraryReservedIdentifiers[acc] = true;\n      invalidEntityIdentifiers[acc] = true;\n    }\n\n    return { success: true, defs, accessor: accessors };\n  } catch (error) {\n    addTempStoredDataTreeToContext(tempDataTreeStore);","sourceCodeStart":221,"sourceCodeEnd":257,"githubUrl":"https://github.com/appsmithorg/appsmith/blob/8cd9021c24cdbea1c3c12c966073708e83db60c2/app/client/src/workers/Evaluation/handlers/jsLibrary.ts#L221-L257","documentation":"Thrown as TernDefinitionError(name) after a library has installed successfully on self, while building autocomplete (Tern) definitions via makeTernDefs(self[key]) for each accessor. If makeTernDefs throws (e.g. the installed export is a structure the def-generator cannot walk, has circular references, or triggers an unexpected type), the accessors are rolled back (self[acc] = undefined) and the install is aborted with message 'Failed to generate autocomplete definitions for ${name}.'","triggerScenarios":"Installing a library whose top-level export contains deeply recursive, non-enumerable, or proxy/getter-heavy structures that break makeTernDefs; a build whose default export is a class instance with unusual prototype shape; an export whose typeof causes an unhandled branch in the def walker.","commonSituations":"Large frameworks (e.g. some ML/graph libs) with circular self-references; minified bundles that expose exotic object shapes; a library version whose entry export changed shape from a prior working version.","solutions":["Try a different build of the same library (UMD vs ESM, or an earlier version) whose top-level export is a plain object/function.","Pin to the last version that installed successfully if a recent release regressed.","If only part of the library is needed, load a smaller subpath build that exposes a simpler export.","Report the failing accessor/export shape so makeTernDefs can be hardened; the underlying thrown error is logged at debug level as 'ternDefinitions failed for ${url}'."],"exampleFix":"// before\nhttps://cdn.jsdelivr.net/npm/heavylib@latest/dist/heavylib.full.js  // circular export breaks makeTernDefs\n\n// after\nhttps://cdn.jsdelivr.net/npm/heavylib@2.3.0/dist/heavylib.core.js  // simpler export shape","handlingStrategy":"fallback","validationCode":"// No safe pre-check for makeTernDefs failure; validate the export shape is simple.\nasync function exportShape(url) {\n  const m = await import(/* webpackIgnore: true */ url).catch(() => null);\n  if (!m) return 'no-module';\n  try { JSON.stringify(m.default ?? m); return 'serializable'; }\n  catch { return 'cyclic-or-non-serializable'; }\n}","typeGuard":"const isPlainSerializable = (v, seen = new WeakSet()) => {\n  if (v === null || typeof v !== 'object') return true;\n  if (seen.has(v)) return false; // cycle\n  seen.add(v);\n  return Object.values(v).every(val => isPlainSerializable(val, seen));\n};","tryCatchPattern":"try {\n  await installLibrary(url);\n} catch (e) {\n  if (e?.name === 'TernDefinitionError') {\n    // Fallback: try an alternate build/version with a simpler export\n    await installLibrary(alternateUrlFor(url));\n  } else throw e;\n}","preventionTips":["Prefer libraries with plain-object or function top-level exports.","Pin to a known-good version; avoid @latest if a recent release regressed.","Load a smaller subpath build when only part of a large library is needed.","Watch the debug log line 'ternDefinitions failed for <url>' to identify the offender."],"tags":["js-library","evaluation","autocomplete","tern","import"],"backgroundTag":null,"analyzedSha":"8cd9021c24cdbea1c3c12c966073708e83db60c2","analyzedAt":"2026-08-12T22:14:19.293Z","schemaVersion":2},"datasetVersion":"2026-08-12T23:17:12.415Z"}