Elm License Checker

Treats the licenses of the dependent packages.

This is inspired by NPM License Checker.

CLI Interface

You can show the package information with the selected fields.

> elm-license-checker --customPath format.json
├─ elm/json@1.1.3
│  ├─ name: elm/json
│  ├─ version: 1.1.3
│  ├─ summary: Encode and decode JSON values
│  ├─ license: BSD-3-Clause
│  └─ licenseFile: C:\Users\kazuki\AppData\Roaming\elm\0.19.1\packages\elm\json\1.1.3\LICENSE
├─ elm/time@1.0.0
│  ├─ name: elm/time
│  ├─ version: 1.0.0
│  ├─ summary: Work with POSIX times, time zones, years, months, days, hours, seconds, etc.
│  ├─ license: BSD-3-Clause
│  └─ licenseFile: C:\Users\kazuki\AppData\Roaming\elm\0.19.1\packages\elm\time\1.0.0\LICENSE
:

See the section “Compatibility with NPM License Checker” for options.

Custom Format

Fields that a format file contains are outputted. Values of fields that licenses do not have are given as ones of fields in a format file. Please also refer a document of the NPM License Checker.

There are an example file in test-asset/format.json.

Library Interface

The following is how to use this as a module.

The JavaScript interface is compatible with NPM License Checker, but is actually a subset.

See the section “Compatibility with NPM License Checker”.

const elc = require('elm-license-checker');

elc.init(
  { start: '/path/to/elm-application' },
  function (err, packages) {
    if (err) {
      // handle the error
    } else {
      // use the packages
    }
  }
);

The PureScript interface is also available.

import Prelude
import Effect (Effect)
import ElmLicenseChecker (init)

main :: Effect Unit
main = do
  packages <- init "/path/to/elm-application"
  -- use the packages

Compatibility with NPM License Checker

Statuses are:

• ⭕ implemented
• ❌ ignored
• 📈 decided to be implemented but not yet done
• 📉 decided to be ignored but not yet done
• ⌛ not decided whether implemented or not

Options

Option	CLI	JS	PS	Description
production	⌛	⌛	⌛	only show production dependencies
development	⌛	⌛	⌛	only show development dependencies
start	📈	⭕	⭕	give where elm.json is
unknown	⌛	⌛	⌛	report guessed licenses as unknown licenses
onlyunknown	⌛	⌛	⌛	only list packages with unknown or guessed licenses
json	⭕	📈	❌	output in json format
csv	⌛	⌛	❌	output in csv format
csvComponentPrefix	⌛	⌛	⌛	prefix column for component in csv format
out	⭕	❌	❌	write the data to a specific file
customPath	⭕	⭕	❌	add a custom format file in JSON
exclude	⌛	⌛	⌛	exclude modules which licenses are in the comma-separated list from the output
relativeLicensePath	⌛	⌛	⌛	output the location of the license files as relative paths
summary	⌛	⌛	⌛	output a summary of the license usage
failOn	⌛	⌛	⌛	fail (exit with code 1) on the first occurrence of the licenses of the semicolon-separated list
onlyAllow	⌛	⌛	⌛	fail (exit with code 1) on the first occurrence of the licenses not in the semicolon-separated list
packages	⌛	⌛	⌛	restrict output to the packages (package@version) in the semicolon-separated list
excludePackages	⌛	⌛	⌛	restrict output to the packages (package@version) not in the semicolon-separated list
excludePrivatePackages	⌛	⌛	⌛	restrict output to not include any package marked as private
direct	⌛	⌛	⌛	look for direct dependencies only

Custom Format

There are compatible fields:

• ⭕ name
• ⭕ version
• ⭕ description the same as summary
• ⭕ copyright always empty
• ⭕ licenses the same as license
• ⭕ licenseFile
• ⭕ licenseText
• ⭕ licenseModified always empty

There are added fields:

• ⭕ summary
• ⭕ license