/**
 * The environment name spinajs matches file suffixes against.
 *
 * One function rather than one per consumer: config file loading ( `foo.dev.js` ) and migration
 * file loading ( `Foo_2026_07_29_10_00_00.dev.ts` ) MUST agree on what `dev` means, or a
 * deployment would load its dev config while running its prod migrations.
 *
 * Case is deliberately not folded: `Local` and `local` are different environments, exactly as
 * they are to the shell that sets APP_ENV.
 *
 * One deliberate deviation from the behaviour this replaced: an explicitly EMPTY `APP_ENV` ( set by
 * `APP_ENV=` or `--env=` ) used to travel through untouched and become the environment NAMED `''`,
 * which produced the config glob `*..{cjs,js}` and therefore matched no file at all. Empty is
 * treated as unset here instead, so such a deployment loads its prod config rather than none.
 */
export declare function normalizeEnvironment(env?: string | null): string;
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