Can Typescript be configured to recognize and utilize the specific dependency versions specified in the package.json file?

After extensive testing, I've come to realize that when executing tsc in a project with a specific dependency, the compilation process succeeds as long as any version of that dependency exists somewhere along Node's module resolution path on my system.

For example:

  • Consider a monorepo managed through yarn workspaces which includes two packages (project_1 and project_2)
  • If project_1 lists a dependency dep_1 in its package.json file
  • Upon running yarn install and adding dep_1 to the root node_modules directory

I have found that I can now utilize import statements for dep_1 within project_2 without explicitly including dep_1 in the package.json of project_2. Strangely enough, tsc does not raise any complaints during compilation.

This has sparked my curiosity - is there a way to adjust this behavior so that Typescript recognizes the dependencies specified in each project's package.json file?

Answer №1

The problem of hoisting packages is a common issue in software development, leading to many flawed packages. Despite this challenge, TSLint offers a helpful solution with its no-implicit-dependencies rule, which aims to stop the importation of hoisted packages that are not explicitly listed as dependencies.

Answer №2

Keep in mind that this concept applies not only to TypeScript but also to plain JavaScript. Hoisting is a fundamental aspect of both languages.

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