[rush] Enable rush list to accept --to and --from params

[sdalonzo]

Is this a feature or a bug?

• Feature
• Bug

Please describe the actual behavior.

My needs would be satisfied by @wbern's proposal here: #1202

We are looking to create a dev/watch workflow based partially around a build:watch bulk task, but we need to be able to scope the run to specific projects in our monorepo.

In the meantime, the ability to apply --to and --from flags to the rush list command would enable us to spawn watch processes for the required projects from a Node script. JSON output would be a bonus.

If the issue is a bug, how can we reproduce it? Please provide detailed steps and include a GitHub branch if applicable. Your issue will get resolved faster if you can make it easy to investigate.

n/a

What is the expected behavior?

rush list output can be filtered by --to and --from, and possibly output JSON

If this is a bug, please provide the tool version, Node.js version, and OS.

Not a bug

[sdalonzo]

@octogonz ☝️ as discussed on Gitter.

[octogonz]

Have you considered using the rush-lib API to solve this problem?

For example, try running these NodeJS commands in the rushstack repo folder:

const rushLib = require("@microsoft/rush-lib");
const RushConfiguration = rushLib.RushConfiguration;
const config = RushConfiguration.loadFromDefaultLocation();
const exampleProject = config.projects[0];

// Prints "@microsoft/api-documenter"
console.log(exampleProject.packageName);

// Prints "[ 'api-documenter-test', 'doc-plugin-rush-stack', 'generate-api-docs' ]"
console.log(exampleProject.downstreamDependencyProjects);

const dependencyName = exampleProject.downstreamDependencyProjects[0];

// Prints "api-documenter-test"
console.log(dependencyName);
const dependencyProject = config.projectsByName.get(dependencyName);

// Prints normalized package.json contents
console.log(JSON.stringify(dependencyProject.packageJson));

If this API is awkward to use for the problem that you're solving, we could make it better.

[sdalonzo]

@octogonz rush-lib did end up serving this purpose well.