🦕 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
jsr (via jsr: specifier)
npm (via npm: specifier)

Note

Version constraints like ~1.2.3 and ^1.2.3 in npm: and jrs: specifiers are not updated.

Third-party registries

Molt also works with the following third-party registries:

The following registries are not compatible with Molt:

How it works

TBW

Limitations

The following limitations are imposed by the design of Molt:

Dependencies are always updated to the latest versions. Version constraints are not handled.
Dependencies in import specifiers are only targeted.

See issues for other known limitations.

References

Molt is inspired by prior works such as

and of full respect to the authors.