transformers.js/pr_1665/en/api/env.md

env

Global configuration for the library. Mutate fields on the exported env object at startup to change where models are loaded from, how files are cached, and how verbose logging is.

Example: Load models from your own server and disable remote downloads.

import { env } from '@huggingface/transformers';
env.allowRemoteModels = false;
env.localModelPath = '/path/to/local/models/';

Example: Point the filesystem cache at a custom directory (Node.js).

import { env } from '@huggingface/transformers';
env.cacheDir = '/path/to/cache/directory/';

Constants

LogLevel

Log-level enum. Assign to env.logLevel to control how verbose the library is. Higher values silence more: DEBUG (10) surfaces everything, NONE (50) suppresses all output. Default is WARNING (30).

Level	Value	Shows
DEBUG	10	Every message, including debug traces.
INFO	20	Errors, warnings, and info messages.
WARNING	30	Errors and warnings.
ERROR	40	Only errors.
NONE	50	Nothing.

import { env, LogLevel } from '@huggingface/transformers';
env.logLevel = LogLevel.ERROR;

env : TransformersEnvironment

The global configuration object. See TransformersEnvironment below for the full set of fields.

Type Definitions

TransformersEnvironment

Shape of the env object. Every field is mutable.

Properties

• version (string) — This version of Transformers.js.
• backends (object) — Exposes backend environment settings that users can override.
• logLevel (number) — The logging level. Use LogLevel enum values. Defaults to LogLevel.WARNING.
• allowRemoteModels (boolean) — Whether to allow loading of remote files, defaults to true. If set to false, it will have the same effect as setting local_files_only=true when loading pipelines, models, tokenizers, processors, etc.
• remoteHost (string) — Host URL to load models from. Defaults to the Hugging Face Hub.
• remotePathTemplate (string) — Path template to fill in and append to remoteHost when loading models.
• allowLocalModels (boolean) — Whether to allow loading of local files, defaults to false if running in-browser, and true otherwise. If set to false, it will skip the local file check and try to load the model from the remote host.
• localModelPath (string) — Path to load local models from. Defaults to /models/.
• useFS (boolean) — Whether to use the file system to load files. By default, it is true if available.
• useBrowserCache (boolean) — Whether to use Cache API to cache models. By default, it is true if available.
• useFSCache (boolean) — Whether to use the file system to cache files. By default, it is true if available.
• cacheDir (string | null) — The directory to use for caching files with the file system. By default, it is ./.cache.
• useCustomCache (boolean) — Whether to use a custom cache system (defined by customCache), defaults to false.
• customCache (CacheInterface | null) — The custom cache to use. Defaults to null. This must be an object that implements the match and put functions of the Web Cache API. For more information, see https://developer.mozilla.org/en-US/docs/Web/API/Cache.
• useWasmCache (boolean) — Whether to pre-load and cache WASM binaries and the WASM factory (.mjs) for ONNX Runtime. Defaults to true when cache is available. This can improve performance and enables offline usage by avoiding repeated downloads.
• cacheKey (string) — The cache key to use for storing models and WASM binaries. Defaults to transformers-cache.
• experimental_useCrossOriginStorage (boolean) — Whether to use the Cross-Origin Storage API to cache model files across origins, allowing different sites to share the same cached model weights. Defaults to false. Requires the Cross-Origin Storage Chrome extension: https://chromewebstore.google.com/detail/cross-origin-storage/denpnpcgjgikjpoglpjefakmdcbmlgih. The experimental_ prefix indicates that the underlying browser API is not yet standardized and may change or be removed without a major version bump. For more information, see https://github.com/WICG/cross-origin-storage.
• fetch (object) — The fetch function to use. Defaults to fetch.