fix: resolve compiled output from dist in bin and postinstall

[edusperoni]

PR Checklist

• The PR title follows our guidelines.
• There is an issue for the bug/feature this PR is for. (no tracking issue — happy to open one)
• You have signed the CLA.
• All existing tests are passing (1514 passing, unchanged).
• Tests for the changes are included. (the failure is not reachable from the unit suite — verification below)

A regression from #6092. The release-script half of this went straight to main as cb3fb8db5, since it was blocking publishing; this is the remainder.

What is the current behavior?

bin/tns and postinstall.js resolve into lib/ relative to their own location:

pathToLib = path.join(__dirname, "..", "lib");          // bin/tns
require(path.join(__dirname, "lib", "constants"));      // postinstall.js

Since the build moved output to dist/, lib/ holds only TypeScript, so from a checkout:

$ ./bin/tns --version
Error: Cannot find module '.../lib/common/verify-node-version'

The published package is unaffected — dist/ is its root there, so lib/ already sits next to bin/. Only the source tree broke, which is exactly why the packaging verification on #6092 did not catch it.

npm install in a checkout runs postinstall and hits the same failure. That is masked today only because npm run setup passes --ignore-scripts.

What is the new behavior?

Both prefer dist/lib when it exists and fall back otherwise, so neither needs to know which layout it is in. The remaining bin/ entries (nativescript, ns, nsc, …) all require("./tns"), so they are fixed with it.

Verification

Not reachable from the unit suite, so both layouts were exercised directly:

• Checkout: ./bin/tns --version reports, ./bin/tns renders 56 help rows, the nativescript/ns/nsc aliases work, node postinstall.js resolves
• Installed package: packed, installed into a clean consumer, confirmed the fallback is the branch taken (no dist/lib present) — --version reports, help renders 56 rows, postinstall.js resolves
• 1514 passing, unchanged

Worth noting for follow-up: nothing in the suite executes bin/tns in either layout, which is why this class of bug is invisible to CI. A smoke test covering both would close that.

Summary by CodeRabbit

• Bug Fixes
  • Improved CLI startup across both published package installations and source checkouts.
  • Improved post-install setup by correctly locating required files in different package layouts.
  • Prevented installation and command-loading issues caused by incorrect library paths.

[coderabbitai]

📝 Walkthrough

Walkthrough

The CLI bootstrap and postinstall script now detect dist/lib and fall back to lib, allowing module resolution in both published packages and source checkouts.

Changes

Runtime library resolution

Layer / File(s)	Summary
Published and source library resolution bin/tns, postinstall.js	Both entry points select dist/lib when it exists and otherwise resolve required modules from lib.

Estimated code review effort: 2 (Simple) | ~10 minutes

Poem

A bunny checked the paths with care,
Found dist/lib waiting there.
If that burrow wasn’t found,
lib kept modules safe and sound.
Hops now work from every ground.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: preferring compiled output from dist in bin and postinstall.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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