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Error running program that uses `fp-ts` from npm (`Is a directory (os error 21)`)

IIndustrial9/7/2023
https://github.com/Industrial/test-fp-ls/blob/main/mod.ts When I run deno run -A mod.ts I get:
error: Unable to load /home/tom/Code/code9/node/test-fp-ls/node_modules/.deno/fp-ts@2.16.1/node_modules/fp-ts/Option imported from file:///home/tom/Code/code9/node/test-fp-ls/mod.ts

Caused by:
Is a directory (os error 21)
error: Unable to load /home/tom/Code/code9/node/test-fp-ls/node_modules/.deno/fp-ts@2.16.1/node_modules/fp-ts/Option imported from file:///home/tom/Code/code9/node/test-fp-ls/mod.ts

Caused by:
Is a directory (os error 21)
Is my import_map.json wrong? https://github.com/Industrial/test-fp-ls/blob/main/import_map.json
GitHub
test-fp-ls/mod.ts at main · Industrial/test-fp-ls
Contribute to Industrial/test-fp-ls development by creating an account on GitHub.
GitHub
test-fp-ls/import_map.json at main · Industrial/test-fp-ls
Contribute to Industrial/test-fp-ls development by creating an account on GitHub.
IIndustrial9/7/2023
It works with esm.sh I would rather use npm: going forward, seeing as it works on deno deploy now.
DAHDeno AI Helper9/7/2023
Based on the documentation, the error message you're seeing typically indicates that Deno is trying to import a directory instead of a file. This could be due to how the fp-ts package is structured or how it's being referenced in your import_map.json. In your import_map.json, you have:
{
"imports": {
"fp-ts": "https://cdn.skypack.dev/fp-ts@2.16.1"
}
}
{
"imports": {
"fp-ts": "https://cdn.skypack.dev/fp-ts@2.16.1"
}
}
This maps the fp-ts import to the URL https://cdn.skypack.dev/fp-ts@2.16.1, which is a directory. Deno expects to import a specific file, not a directory. You might need to specify the exact file in the fp-ts package that you want to import. For example, if you wanted to import the Option module from fp-ts, your import map might look like this:
{
"imports": {
"fp-ts/Option": "https://cdn.skypack.dev/fp-ts@2.16.1/Option"
}
}
{
"imports": {
"fp-ts/Option": "https://cdn.skypack.dev/fp-ts@2.16.1/Option"
}
}
Then in your mod.ts file, you would import the Option module like this:
import { Option } from "fp-ts/Option";
import { Option } from "fp-ts/Option";
Please note that the exact URL and import statement might differ based on the structure of the fp-ts package. You'll need to adjust them to match the actual structure of the package. If you continue to experience issues, it might be helpful to check if fp-ts has specific instructions for usage with Deno, or consider reaching out to the fp-ts maintainers for

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