[jest-resolve] Prevent default resolver failure when potential resolution directory does not exist#4483
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…tion directory does not exist Summary: A recent change to take precedence of NODE_PATH for module resolution (jestjs#4453) made this issue more likely to occur since NODE_PATH could contain non-existent directories. While this could have occurred prior to the change, it was less likely since it is more common that modules are in local `node_modules`. Either way, non-existent directories should be treated the same way as non-existent files during module resolution. The equivalent case for `statSync` returning `ENOENT` for files is `ENOTDIR` for directories. We may want to add `ENOTDIR` to `isFile` as well. Test Plan: 1. `yarn test` 2. Link cli into another project, set NODE_PATH to non-existent directories, no longer see cryptic `Cannot find module` error. Instead, it now resolves to a potential path further down the path list.
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Sure. A test would be nice. |
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Oct 2, 2017
…tion directory does not exist (jestjs#4483) Summary: A recent change to take precedence of NODE_PATH for module resolution (jestjs#4453) made this issue more likely to occur since NODE_PATH could contain non-existent directories. While this could have occurred prior to the change, it was less likely since it is more common that modules are in local `node_modules`. Either way, non-existent directories should be treated the same way as non-existent files during module resolution. The equivalent case for `statSync` returning `ENOENT` for files is `ENOTDIR` for directories. We may want to add `ENOTDIR` to `isFile` as well. Test Plan: 1. `yarn test` 2. Link cli into another project, set NODE_PATH to non-existent directories, no longer see cryptic `Cannot find module` error. Instead, it now resolves to a potential path further down the path list.
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Summary
A recent change to take precedence of NODE_PATH for module resolution (#4453) made this issue more likely to occur since NODE_PATH could contain non-existent directories. While this could have occurred prior to the change, it was less likely since it is more common that modules are in local
node_modules.Either way, non-existent directories should be treated the same way as non-existent files during module resolution. The equivalent case for
statSyncreturningENOENTfor files isENOTDIRfor directories. We may want to addENOTDIRtoisFileas well.Test plan
yarn testCannot find moduleerror. Instead, it now resolves to a potential path further down the path list.Additional Context
One other potential fix would be to propagate these exceptions up to the
Resolver.findNodeModulecallsites. Currently, this method absorbs all exceptions though, and since it is used externally by jest-config, I figured keeping the existing non-throwing API was preferable.