@ryankshaw/next-runtime-env/build/script/env.js

Next.js Runtime Environment Configuration - Populates your environment at runtime rather than build time.

import { isBrowser } from '../helpers/is-browser.js';
import { startsWithNextPublic, } from '../helpers/next-public-utils.js';
import { PUBLIC_ENV_KEY } from './constants.js';
/**
 * Reads a safe environment variable (from `window.__ENV` in the browser or `process.env` on the server).
 *
 * @param key - The environment variable key to read. Must start with 'NEXT_PUBLIC_'
 * @returns The environment variable value.
 * @throws An error if the environment variable doesn't start with 'NEXT_PUBLIC_' of it is not found
 * @example const API_URL = env('NEXT_PUBLIC_API_URL')
 */
export function env(key) {
    if (!startsWithNextPublic(key)) {
        throw new Error(`Environment variable '${key}' is not public and cannot be accessed using @ryankshaw/next-runtime-env`);
    }
    const value = isBrowser() ? window[PUBLIC_ENV_KEY]?.[key] : process.env[key];
    if (!value) {
        throw new Error(`Environment variable '${key}' was not found. Things using @ryankshaw/next-runtime-env are expected to be in process.env`);
    }
    return value;
}
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