import { AttributeValue, DiagLogLevel } from '@opentelemetry/api';
import type { EnvVarKey, LogLevel } from './types';
import { MaybePromise, Resource } from '@opentelemetry/resources';
export type ConfigCache = Map<string, string>;
export declare function findServiceName(cache?: ConfigCache): string | undefined;
export declare function defaultServiceName(cache?: ConfigCache): string;
export declare function getNonEmptyEnvVar(key: EnvVarKey): string | undefined;
export declare function parseEnvBooleanString(value?: string): boolean | undefined;
export declare function getEnvBoolean(key: EnvVarKey, defaultValue?: boolean): boolean;
export declare function getEnvNumber(key: EnvVarKey | EnvVarKey[], defaultValue: number): number;
export declare function deduplicate(arr: string[]): string[];
export declare function getEnvArray(key: EnvVarKey): string[] | undefined;
export declare function getEnvValueByPrecedence(keys: EnvVarKey[], defaultValue?: string): string | undefined;
export declare function assertNoExtraneousProperties(obj: Record<string, any>, expectedProps: string[]): void;
export declare function toDiagLogLevel(level: LogLevel): DiagLogLevel;
export declare function parseLogLevel(value: string | null | undefined): DiagLogLevel;
export declare function ensureResourcePath(url: string | undefined | null, resourcePath: string): string | undefined;
export declare function resolveOtlpExporterUrl(args: {
    endpoint: string | undefined;
    protocol: string;
    signalEndpointKey: EnvVarKey;
    resourcePath: string;
}): string;
export declare function readFileContent(path: string | undefined | null): Buffer | undefined;
export declare function findAttribute(resource: Resource, key: string): MaybePromise<AttributeValue | undefined>;
export declare function listEnvVars(): {
    name: string;
    property: string;
    description: string;
    default: string;
    type: string;
    category: string;
}[];
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