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testcontainers

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Testcontainers is a NodeJS library that supports tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container

github.com/testcontainers/testcontainers-node

testcontainers/testcontainers-node

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export declare const isDefined: <T>(value: T | undefined) => value is T; export declare const isEmptyString: (value: string) => value is string; export declare const isNotEmptyString: (value: string) => value is string;