fix: Use existing importmap for build by passing --map flag

[JayaKrishnaNamburu]

Adds --map option for jspm build command.
While moving the jspm-vscode project to use jspm-cli workflow. We will generate the importmap.json only once. And use it for re-runs or update it only when needed.

So, when the extension is being built. We should use the existing map. Currently the cli throws an error because --map is not allowed for build command.

Usage reference -> https://github.com/jspm/jspm-vscode/blob/refactor-build-workflow/chompfile.toml#L9

Eg

jspm build --map importmap.json --config rollup-config.mjs

[guybedford]

Looks good thanks. Any idea about the CI failure? Note that most CLI operations should automatically pick up the local importmap.json file without it needing to be provided via an explicit flag. Can we not do the same for the build?

[JayaKrishnaNamburu]

Yes, the cli is picking the local build file by default. Needed only if we change the file name to something else than importmap.json
https://github.com/jspm/jspm-cli/blob/main/src/utils.ts#L213-L222

[JayaKrishnaNamburu]

The CI failures are there for a while, should look into it. Something with assertions

[JayaKrishnaNamburu]

Fixed tests for one use-case. There is another use-case that is failing for jspm install lit from esm.sh now. But i have a hunch it might not be realted to the generator.

Here is the error

Error: No './css-tag' exports subpath defined in https://esm.sh/*@lit/[email protected]/ resolving @lit/reactive-element/css-tag imported from https://esm.sh/v135/@lit/[email protected]/X-ZS8q/esnext/reactive-element.mjs.

Error: Scenario "jspm install lit -p esm.sh -e production" failed.
    at runScenario (file:///home/runner/work/jspm-cli/jspm-cli/test/scenarios.ts:1:845)
    at async runScenarios (file:///home/runner/work/jspm-cli/jspm-cli/test/scenarios.ts:1:444) {
  [cause]: AssertionError [ERR_ASSERTION]: undefined == true
      at Object.validationFn (file:///home/runner/work/jspm-cli/jspm-cli/test/providers.test.ts:1:1140)
      at runScenario (file:///home/runner/work/jspm-cli/jspm-cli/test/scenarios.ts:1:790)
      at async runScenarios (file:///home/runner/work/jspm-cli/jspm-cli/test/scenarios.ts:1:444) {
    generatedMessage: true,
    code: 'ERR_ASSERTION',
    actual: undefined,
    expected: true,
    operator: '=='
  }
}
Unable to complete all tasks.
x test/providers.test.ts [24.707770[31](https://github.com/jspm/jspm-cli/actions/runs/7144479899/job/19458208881#step:7:32)s]
x :test:##
x :test

The package @lit/reactive-element seems to create a export map with .js extension. And maybe the us causing the issue when trying to access the same without extensions ?
https://unpkg.com/browse/@lit/[email protected]/package.json

[guybedford]

Can we at least disable the test and post a new issue to reenable it? We can't land PRs if CI is failing...

Otherwise looks good to land and thanks for clarifying importmap.json is already read by default.

[JayaKrishnaNamburu]

Disabled esm.sh provider and loged a bug with repro on the generator.
jspm/generator#335