torotask/dist/utils/get-config-from-env.js

Task queue processing in NodeJS based on BullMQ and Redis

import camelcase from 'camelcase';
import { set } from 'lodash-es';
/**
 * Reads environment variables starting with a given prefix,
 * removes the prefix, and converts the remaining key to camelCase.
 *
 * Example:
 * If prefix is 'REDIS_' and env var is REDIS_HOST=localhost,
 * it returns { host: 'localhost' }.
 *
 * @param prefix The prefix to look for (case-insensitive).
 * @returns A record with camelCased keys and their corresponding values.
 */
export function getConfigFromEnv(prefix, env) {
    const config = {};
    const lowerCasePrefix = prefix.toLowerCase();
    env = env || process.env;
    for (const [key, value] of Object.entries(env)) {
        const lowerCaseKey = key.toLowerCase();
        if (lowerCaseKey.startsWith(lowerCasePrefix) && value !== undefined) {
            // Remove prefix, handle potential leading underscore if prefix didn't end with one
            const keyWithoutPrefix = key.substring(prefix.length);
            if (keyWithoutPrefix.includes('__')) {
                const path = keyWithoutPrefix.split('__').map((pathKey) => camelcase(pathKey));
                set(config, path.join('.'), value);
            }
            else {
                const camelCaseKey = camelcase(keyWithoutPrefix, { locale: false });
                config[camelCaseKey] = value;
            }
        }
    }
    return config;
}
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