Having difficulties in TypeScript identifying types within a project containing multiple node_modules directories

I am currently in the process of transitioning a codebase from Flow to TypeScript. I am encountering an issue with the error message 

Cannot find module 'SOME DEPENDENCY' or its corresponding type declarations.ts(2307)
for several dependencies that have their typings included within the dependency itself.

An example of one such dependency is: ./node_modules/axios/index.d.ts

Within my project structure, I have the following files:

./tsconfig.json
./src/SomeFileUsingAxios.tsx
./node_modules
./vendor/node_modules
./vendor/node_modules/axios

I have attempted solutions such as using 

"typeRoots": ["./node_modules/@types", "./vendor/node_modules/@types"]
, as well as 
"rootDirs": ["./", "vendor/"]
, and even trying both options together ^

Unfortunately, I am unable to get TypeScript to recognize this particular dependency! Any suggestions?

typescript

Answer №1

When using the "node" module resolution strategy, the compiler first searches for modules in the local folder's node_modules directory before moving up the project structure. In the scenario you presented, it would check for the axios module in ./src/node_modules, then in ./node_modules. However, it would not search in ./vendor/node_modules.

To resolve this issue, one solution is to install the axios module directly in the main package, or to create a path mapping in TypeScript to locate the module. An example of this could be:

paths: {
  '*': './vendor/node_modules/*',
}

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