/**
 * Recursively interpolates `${VAR}` and `${VAR:-default}` patterns in all
 * string values of the given object/array/primitive. Non-string leaves
 * (numbers, booleans, null, undefined) are returned unchanged.
 *
 * Escaping: `$${LITERAL}` is replaced with the literal text `${LITERAL}`.
 */
export declare function interpolateValues(obj: unknown, environ: Record<string, string | undefined>): unknown;
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