/**
 * Expands all symbols in the format `{env:VAR_NAME}` with the value of the environment variable `VAR_NAME`.
 * If no such environment variable is set, the symbol is replaced with an empty string.
 * Symbols without the `env:` prefix are not replaced.
 *
 * @param config Any JSON object, but typically an AppConfig object
 */
export declare function expandEnvironmentVariables(config: Record<string, unknown>): void;
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