Universal.EcmaScriptModule.Tool 1.3.1

Universal.EcmaScriptModule.Tool

.NET tool for inspecting, restoring, building, packaging, and testing browser-native ECMAScript module projects.

Installation

dotnet tool install --global Universal.EcmaScriptModule.Tool --version 1.3.0

The installed command is esm.

esm inspect Universal.Common.esmproj

The complete command set is inspect, restore, build, pack, import-map, and test.

Generate standard JSON for an application to place or embed in its own HTML:

esm import-map Application.esmproj
esm import-map Application.esmproj --output wwwroot/importmap.json --locked-mode

Package exports use exact immutable URLs advertised by each HTTP registry. A ProjectReference must declare its deployed base URL with ImportMapBaseUrl; local-folder packages deliberately fail because they have no deployable browser URL.

Restore always writes the generated dependency graph to obj/esm.assets.json:

esm restore Universal.Common.esmproj

Folder and HTTP sources use the same resolver:

esm restore Universal.Common.esmproj --source C:\Packages\Esm
esm restore Universal.Common.esmproj --source https://api.esm.example/v1/index.json

Locking is optional, like NuGet's packages.lock.json:

esm restore Universal.Common.esmproj --use-lock-file
esm restore Universal.Common.esmproj --locked-mode
esm restore Universal.Common.esmproj --force-evaluate

It can also be enabled for a project:

<PropertyGroup>
  <RestorePackagesWithLockFile>true</RestorePackagesWithLockFile>
</PropertyGroup>

Commit esm.lock.json for applications and locked CI builds. Reusable libraries can omit it.

Browser test projects run through an installed Edge, Chrome, or Chromium browser:

esm test Universal.Common.Tests.esmproj
esm test Universal.Common.Tests.esmproj --browser msedge --headed

The --browser value can also be the path to a Chromium-family browser executable, which is useful for portable CI installations.