transformers.js/src/models/auto/feature_extraction_auto.js

import { FEATURE_EXTRACTOR_NAME, GITHUB_ISSUE_URL } from '../../utils/constants.js';
import { getModelJSON } from '../../utils/hub.js';
import { FeatureExtractor } from '../../base/feature_extraction_utils.js';
import * as AllFeatureExtractors from '../feature_extractors.js';

export class AutoFeatureExtractor {

    /** @type {typeof FeatureExtractor.from_pretrained} */
    static async from_pretrained(pretrained_model_name_or_path, options={}) {

        const preprocessorConfig = await getModelJSON(pretrained_model_name_or_path, FEATURE_EXTRACTOR_NAME, true, options);

        // Determine feature extractor class
        const key = preprocessorConfig.feature_extractor_type;
        const feature_extractor_class = AllFeatureExtractors[key];

        if (!feature_extractor_class) {
            throw new Error(`Unknown feature_extractor_type: '${key}'. Please report this at ${GITHUB_ISSUE_URL}.`);
        }

        // Instantiate feature extractor
        return new feature_extractor_class(preprocessorConfig);
    }
}