A module version manager for Deno

A module version manager for Deno

A simple module version manager for Deno. dem creates `dem.json` and links script files with version


  • A simple module version manager for Deno.
  • dem creates dem.json and links script files with version.
    • linked scripts are stored in vendor directory.
  • dem provides an easy way to update dependencies.


Using https://deno.land/std/http/server.ts at v0.51.0

  • dem.json
    • generated file like a package.json
  "modules": [
      "protocol": "https",
      "path": "deno.land/std",
      "version": "v0.51.0",
      "files": [
  • vendor/https/deno.land/std/http/server.ts
    • generated linked script includes version specified in dem.json
export * from "https://deno.land/[email protected]/http/server.ts";
  • example.ts
    • script to run
// You can import module without the version.
import { serve } from "./vendor/https/deno.land/std/http/server.ts";


deno install --allow-read --allow-write --allow-net -f -n dem https://deno.land/x/[email protected]/cmd.ts


Getting Started

1. dem init to create dem.json
$ dem init
successfully initialized the project.
2. dem add to add module.
$ dem add https://deno.land/[email protected]
successfully added new module: https://deno.land/std, version: v0.51.0
3. Edit your script and import module from vendor.


import * as path from './vendor/https/deno.land/std/fs/path.ts';

console.log(path.join(Deno.cwd(), 'example'));
4. dem ensure to resolve modules.
$ dem ensure
successfully created link: https://deno.land/[email protected]/fs/path.ts
5. Run your script.
$ deno example.ts

Standard Usage

Updating module

  • dem update updates versions in dem.json and linked scripts.
$ dem update https://deno.land/[email protected]
successfully updated module: https://deno.land/std, version: v0.52.0

Advanced Usage


  • With alias, shortened script paths are available.


// Original
import * as dejs from "./vendor/https/deno.land/x/dejs/mod.ts"
// With alias
import * as dejs from "./vendor/dejs.ts"
How to use alias
  1. execute dem alias.
# create alias for module.
$ dem alias https://deno.land/x/dejs/mod.ts dejs.ts # ./vendor/dejs.ts will be created.
  1. import script using alias path
import * as dejs from "./vendor/dejs.ts"
  1. run dem ensure.
# create link for `./vendor/https/deno.land/x/dejs/mod.ts`.
$ dem ensure


dem init                                          # initialize dem.json
dem add https://deno.land/x/[email protected]            # add module `dejs` and set its version to `0.1.0`
dem link https://deno.land/x/dejs/mod.ts          # create link of `[email protected]/mod.ts` and put it into vendor.
dem update https://deno.land/x/[email protected]         # update module to `0.2.0`
dem unlink https://deno.land/x/dejs/mod.ts        # remove link of `[email protected]/mod.ts`.
dem remove https://deno.land/x/dejs               # remove module `dejs`
dem ensure                                        # resolve file paths of added modules used in project and link them.
dem prune                                         # remove unused modules and linked scripts.
dem alias https://deno.land/x/dejs/mod.ts dejs.ts # create alias for module and put it into vendor.
dem unalias dejs.ts                               # remove alias for module.

Unsupported features

  • default export
  • manage .d.ts file



Download Details:

Author: syumai

Source Code: https://github.com/syumai/dem

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