🦕 Molt

Warning

Molt is still being developed actively. The API is not stable yet and may change frequently.

Molt is a Deno module to bump versions in import specifiers, like udd, but with some unique concepts:

The Deno way - Molt finds dependencies and checks their latest versions in the same way as the Deno runtime does.

Module-first - The core logic is provided as a Deno module, 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.

Usage

Deno Module

API Reference

Examples

Update all dependencies in a module and write the changes to local files

import { collect, writeAll } from "https://deno.land/x/molt@{VERSION}/mod.ts";

const updates = await collect("./mod.ts");
await writeAll(updates);

Update all dependencies in a module and commit the changes to git

import { collect, commitAll } from "https://deno.land/x/molt@{VERSION}/mod.ts";

const updates = await collect("./mod.ts");

await commitAll(updates, {
  groupBy: (dependency) => dependency.name,
  composeCommitMessage: ({ group, version }) =>
    `build(deps): bump ${group} to ${version!.to}`,
});

CLI

Although it is encouraged to write your own scripts, a pre-built CLI tool is also provided as cli.ts for convenience or a reference implementation, which is supposed to cover most of the use cases.

Installation (optional)

The molt CLI can be installed globally with the following command, for example:

deno install --allow-env --allow-read --allow-write --allow-net --allow-run=git,deno\
--name molt https://deno.land/x/molt@{VERSION}/cli.ts

Alternatively, you may prefer to run the remote script directly through deno task for better security or reproducibility:

{
  "tasks": {
    "update": "deno run --allow-env --allow-read --allow-write=. --allow-run=git,deno --allow-net=deno.land https://deno.land/x/molt@{VERSION}/cli.ts ./**/*.ts",
    "update:commit": "deno task -q update --commit --pre-commit=fmt"
  }
}

Usage

> molt --help
Usage: molt <modules...>

Description:

  Check updates to dependencies in Deno modules

Options:

  -h, --help               - Show this help.                                              
  -v, --version            - Print version info.                                          
  --import-map   <file>    - Specify import map file                                      
  --ignore       <deps>    - Ignore dependencies                                          
  --only         <deps>    - Check specified dependencies                                 
  -w, --write              - Write changes to local files            (Conflicts: --commit)
  -c, --commit             - Commit changes to local git repository  (Conflicts: --write) 
  --pre-commit   <tasks>   - Run tasks before each commit            (Depends: --commit)  
  --post-commit  <tasks>   - Run tasks after each commit             (Depends: --commit)  
  --prefix       <prefix>  - Prefix for commit messages              (Depends: --commit)  
  --summary      <file>    - Write a summary of changes to file                           
  --report       <file>    - Write a report of changes to file                            

Examples:

  Check updates in a module:     molt deps.ts                               
  Include multiple modules:      molt mod.ts lib.ts                         
  Target all .ts files:          molt ./**/*.ts                             
  Specify an import map:         molt mod.ts --import-map deno.json         
  Ignore specific dependencies:  molt deps.ts --ignore=deno_graph,node_emoji
  Only check deno_std:           molt deps.ts --only deno.land/std

Note

Molt CLI automatically uses import maps defined in deno.json or deno.jsonc if available.
You can't, however, use import maps as entrypoints.

Examples

Check for updates

> molt mod.ts 
📦 deno.land/std 0.200.0 => 123.456.789
  lib.ts 0.200.0
  mod.ts 0.200.0

📦 deno.land/x/deno_graph 0.50.0 => 123.456.789
  mod.ts 0.50.0

📦 node-emoji 2.0.0 => 123.456.789
  mod.ts 2.0.0

Write changes to files

> molt mod.ts --write
    ...
💾 lib.ts
💾 mod.ts

Commit changes to git

> molt mod.ts --commit --pre-commit=test --prefix :package: --summary title.txt --report report.md
    ...
📝 :package: bump deno.land/std from 0.200.0 to 123.456.789
📝 :package: bump deno.land/x/deno_graph from 0.50.0 to 123.456.789
📝 :package: bump node-emoji from 2.0.0 to 123.456.789

📄 title.txt
📄 report.md

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, which means that we may implement registry-specific routines for them:

• deno.land/std
• deno.land/x
• 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

How it works

TBW

Limitations

The following limitations are imposed by the design of Molt:

• Dependencies are always updated to the latest versions. No version constraints are supported.
• Dependencies in import specifiers are only targeted.

See issues for other known limitations.

References

Molt is inspired by prior works such as

• deno-udd
• dmm
• updater

and of full respect to the authors.