[pranesh-sridhar]

Summary

Ran every project under examples/ through a local npm test (fresh build, then mocha, then posttest lint where defined) on Node v26.10.0. All 24 examples pass their mocha tests. Three examples failed npm test only because of the lint step, and lb-eslint itself was broken in every package. This PR fixes those. (example-rpc-server had a fourth lint failure, but it was fixed upstream by a2d1e2dea while this PR was open, so that change was dropped on rebase.)

Findings and fixes

Area	Issue	Fix
@loopback/build	lb-eslint crashed in every package with ERR_PACKAGE_PATH_NOT_EXPORTED. ESLint 8.57+ does not expose bin/eslint through its exports map, so require.resolve('eslint/bin/eslint') fails.	resolveCLI now falls back to resolving <pkg>/package.json and building the absolute path from it (packages/build/bin/utils.js).
example-context	mocha/handle-done-callback misreads this: Mocha.Context as a done callback.	Use an arrow function and .timeout(5000).
example-express-composition	Typed linting cannot parse .eslintrc.js (not in tsconfig.json).	Add .eslintignore that ignores .eslintrc.js.
example-validation-app	Same .eslintrc.js parse error.	Add .eslintrc.js to the existing .eslintignore.

Test results

Example	Mocha result
access-control-migration	24 passing
binding-resolution	3 passing
context	1 passing
express-composition	10 passing
file-transfer	6 passing
graphql	16 passing
greeter-extension	4 passing
greeting-app	3 passing
hello-world	1 passing
lb3-application	33 passing
log-extension	19 passing
metrics-prometheus	2 passing
multi-tenancy	9 passing
passport-login	29 passing
references-many	45 passing
rest-crud	13 passing
rpc-server	8 passing
soap-calculator	2 passing, 17 pending (describe.skip in source)
socketio	1 passing
todo-jwt	6 passing
todo-list	74 passing
todo	37 passing
validation-app	13 passing
webpack	4 passing

After the fixes:

• npm test exits 0 for context, express-composition and validation-app (re-verified after rebasing onto the latest master).
• Root-level run-eslint over examples and packages/build exits 0.
• The 21 packages/build tests still pass.

Not changed (intentionally)

Running lb-eslint directly inside other packages (for example todo, webpack, packages/http-server) still reports the this: Mocha.Context and .eslintrc.js errors. The root .eslintrc.js already turns mocha/handle-done-callback off for .ts files, CI lints from the root, and those packages do not run lint in posttest, so npm test is unaffected. Making per-package lint match root lint would be a follow-up change to @loopback/eslint-config.

Checklist

• DCO signed in all commits
• npm test passes for every touched example
• New tests added: not applicable, lint/tooling fixes only
• Code conforms with the style guide
• API documentation / docs / CLI templates: not affected

[dhmlau]

@pranesh-sridhar, thanks for the PR. LGTM.