When exactly does a Go project need to use multiple modules?

Go project: When is a multi-module structure needed?

Use the go list command to view the module dependencies of the Go project. Typically, a single Go module is sufficient to meet project requirements. However, in some scenarios, the use of a multi-module structure can significantly improve development efficiency and code organization.

The multi-Module Workspaces mechanism introduced in Go 1.18 provides strong support for the application of multi-module structures. The core is to solve local dependencies and code customization problems.

For example, when it is necessary to debug or modify a dependency library (such as a package called util ), it is not best practice to modify the library code directly and submit it to the version control system. The multi-module workspace allows developers to create independent modules locally, isolating local modifications from the main project. In this way, developers can freely debug and modify dependency libraries without affecting the work of the main project or other developers, avoiding mistakenly submitting local paths to the code repository, and ensuring the smoothness of team collaboration. This makes dependency management more flexible and improves development efficiency and code quality.

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