Where can I see deno downloaded packages?

Question

I am new to deno and currently exploring for a minimum viable project in deno. I want to like npm which downloads the npm packages inside the folder node_modules, similarly I want to see the deno packages in a directory. In my current project I do not see any downloaded packages. Please suggest me where to look for deno packages. If I write dep.ts file to mention all the deno packages, can I use the same deno packages for some other projects. My question is bit similar to what Maven or Gradle in java handles. It means I want to know whether deno maintains a single folder in OS so that all the packages are downloaded and used in many projects. I want to check the directory containing the deno packages in windows 10.

Azoic

Answer 1

The imports are cached in $DENO_DIR

From the docs:

Deno caches remote imports in a special directory specified by the $DENO_DIR environmental variable. It defaults to the system's cache directory if $DENO_DIR is not specified. The next time you run the program, no downloads will be made. If the program hasn't changed, it won't be recompiled either. The default directory is:

• On Linux/Redox: $XDG_CACHE_HOME/deno or $HOME/.cache/deno
• On Windows: %LOCALAPPDATA%/deno (%LOCALAPPDATA% = FOLDERID_LocalAppData)
• On macOS: $HOME/Library/Caches/deno If something fails, it falls back to $HOME/.deno

Relying on external servers is convenient for development but brittle in production. Production software should always bundle its dependencies. In Deno this is done by checking the $DENO_DIR into your source control system, and specifying that path as the $DENO_DIR environmental variable at runtime.

You can see the information by running: deno info

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what is the deno command to install all the dependencies mentioned in dep.ts file

To install just import dep.ts in one of your files and run:

deno run index.js

Jury

what is the deno command to install all the dependencies mentioned in dep.ts file ? – Azoic

I am checking constantly, Really Good and Great Answer. Again +1 and Accepted from my side. I may ask more questions, please bear with me. I am generating more interest on deno and it seems to be more promising than NodeJs. – Azoic

Thanks! No worries I'll be happy to answer any questions if I know the answer of course :). I don't know if more promising than Node.js, they're both great IMO. – Jury

I just mentioned import * as logger from "https://deno.land/std/log/mod.ts"; in dep.ts file. When I tried to import in another class like this 'import {logger} from "./dep.ts";', it is not working, it says error: TS2305 [ERROR]: Module '"https://deno.land/std/log/mod"' has no exported member 'logger'. – Azoic

you have to export in deps.ts, check example: deno.land/manual/… – Jury

Please don't mind, I asked this question. #61800986 – Azoic

Answer 2

You can use deno info to get the cache directory of remote modules.

Sample output (Windows 10):

> deno info
DENO_DIR location: "C:\\Users\\ford\\AppData\\Local\\deno"
Remote modules cache: "C:\\Users\\ford\\AppData\\Local\\deno\\deps"
TypeScript compiler cache: "C:\\Users\\ford\\AppData\\Local\\deno\\gen"

To get info about a single (remote) module:

deno info --unstable https://deno.land/std/fs/mod.ts # --unstable needed as of 1.0.3

Sample output:

local: C:\Users\ford\AppData\Local\deno\deps\https\deno.land\434fe4a7...8f300799a073e0
type: TypeScript
compiled: C:\Users\ford\AppData\Local\deno\gen\https\deno.land\std\fs\mod.ts.js
map: C:\Users\ford\AppData\Local\deno\gen\https\deno.land\std\fs\mod.ts.js.map 
deps:
https://deno.land/std/fs/mod.ts
  ├─┬ https://deno.land/std/fs/empty_dir.ts
  ...

local: Local path of source file (TS or JS)
compiled: Local path of compiled source code (.js, for TS only)
map: Local path of source map (TS only)
deps: Dependency tree of source file

Tsingyuan

Was it introduced in the latest version or from the inception ? – Azoic

The cache location output for deno info has been added in v1.0.2, see related PR. – Tsingyuan