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This article provides a comprehensive analysis of the common 'Could not find a declaration file for module' error in TypeScript, using the @ts-stack/di module as a case study. It explores module resolution mechanisms, declaration file configuration, and various solution strategies. Through comparison of different import approaches and detailed explanation of proper main and types field configuration in package.json, the article offers multiple resolution methods including @types package installation, custom declaration files, and configuration adjustments. With practical code examples and implementation guidance, it helps developers thoroughly understand and resolve TypeScript module import issues.