🦕 Molt

Warning

The project is still under active development. The API is not stable yet and may change frequently.

Molt is a project to provide Deno modules and a CLI to manage dependencies in Deno projects. Inspired by udd, but built from scratch with different design principles:

The Deno way - Internal logics of the Deno runtime are reused as much as possible, through the deno_graph and deno_lockfile crates, etc.

Module-first - The core features are provided as Deno modules, which enables you to write the best scripts for your use cases.

Git-friendly - The operations can be easily divided into logical groups for subsequent git commits.

Features

Molt can update to dependencies written in different formats. URL imports, npm: and jsr: specifiers are all supported:

ES modules

- import { copy } from "https://deno.land/std@0.222.0/bytes/copy.ts";
+ import { copy } from "https://deno.land/std@0.224.0/bytes/copy.ts";
...

Import maps

  {
    "imports": {
-     "std/": "https://deno.land/std@0.222.0/",
+     "std/": "https://deno.land/std@0.224.0/",
      "@luca/flag": "jsr:@luca/flag@^1.0.0",
-     "@conventional-commits/parser": "npm:@conventional-commits/parser@^0.3.0"
+     "@conventional-commits/parser": "npm:@conventional-commits/parser@^0.4.0"
    }
  }

Lock files

  {
    "version": "3",
    "packages": {
      "specifiers": {
-       "jsr:@luca/flag@^1.0.0": "jsr:@luca/flag@1.0.0",
-       "npm:@conventional-commits/parser@^0.3.0": "npm:@conventional-commits/parser@0.3.0"
+       "jsr:@luca/flag@^1.0.0": "jsr:@luca/flag@1.0.1",
+       "npm:@conventional-commits/parser@^0.3.0": "npm:@conventional-commits/parser@0.4.1"
      },
      "jsr": {
-       "@luca/flag@1.0.0": {
-         "integrity": "1c76cf54839a86d0929a619c61bd65bb73d7d8a4e31788e48c720dbc46c5d546"
+       "@luca/flag@1.0.1": {
+         "integrity": "dce7eb4159b1bdb1606fe05c2e5388dcff5ae3b0b84184b934bc623143742408"
        }
      },
      ...

Note

Molt uses a similar versioning strategy as increase-if-necessary in dependabot to bump version ranges¹.

Packages and documentation

@molt/cli

A CLI to update dependencies, supposed to be the entry point for most users.

@molt/core

Deno modules to collect and manipulate dependencies and updates.

@molt/integration

Modules to integrate Molt with thrid-party platforms.

@molt/lib

General-purpose utilities developed for Molt, but may be used independently.

Integration

molt-action

A GitHub Action to create pull requests for dependency updates.

Compatibility with registries

We check compatibility with various registries in an integration test.

Deno's official registries

Molt offers first-class support for the following registries, implementing registry-specific routines for them:

• deno.land/std
• deno.land/x
• jsr (via jsr: specifier)
• npm (via npm: specifier)

Third-party registries

Molt also works with the following third-party registries:

• esm.sh
• unpkg.com

The following registries are not compatible with Molt:

• cdn.jsdelivr.net
• cdn.skypack.dev
• esm.run
• denopkg.com
• ga.jspm.io
• pax.deno.dev
• raw.githubusercontent.com
• x.nest.land

Related projects

Molt is inspired by other projects like

• deno-udd
• dmm
• updater

Footnotes

1. See Dependabot's versioning strategy. ↩