Refactor eslint

[kadykov]

Summary

This PR updates the project to restore compatibility with the newer ESLint toolchain and keeps the repository’s quality checks green.

What changed

• Removed redundant type assertions that are now flagged by the newer ESLint rules.
• Updated error handling in the spec loader and e2e tests to preserve the original error cause in a way that remains compatible with the current TypeScript target.
• Adjusted TypeScript configuration to avoid the current deprecation warning while keeping the build working.
• Updated dependency metadata and lockfile state to reflect the latest toolchain-compatible setup.

Why

The dependency update surfaced a set of lint issues that were previously not enforced or surfaced differently. This change brings the codebase back in line with the current linting standards and ensures the existing quality gates continue to pass.

Verification

The following checks were run successfully:

• just all
• npm run lint
• npm run build
• npm run test:coverage

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/config.ts	100.00% <ø> (ø)
src/handlers/handler-utils.ts	92.40% <100.00%> (ø)
src/services/reference-transform.ts	94.87% <100.00%> (ø)
src/services/spec-loader.ts	83.33% <100.00%> (+0.98%)	⬆️

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 0 complexity · 0 duplication

Metric	Results
Complexity	0
Duplication	0

View in Codacy

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[Copilot]

⚠️ Not ready to approve

The new cause attachment in production code sets non-standard property descriptors (enumerable/non-writable), and the toolchain bump would benefit from explicitly declaring the required Node version to avoid unsupported installs.

Pull request overview

This PR updates the repository’s TypeScript/ESLint toolchain compatibility by cleaning up type assertions flagged by newer lint rules, preserving original error causes in a TS-target-compatible way, and updating TS config and dependency metadata to keep quality checks green.

Changes:

• Remove redundant type assertions across handlers/services and unit tests.
• Preserve original thrown errors via Error.cause (implemented using Object.defineProperty) in the spec loader and e2e parsing helpers.
• Update TypeScript configuration and bump toolchain-related dependencies (plus lockfile refresh).

File summaries

File	Description
tsconfig.json	Adds ignoreDeprecations to silence TS 6.x deprecation warnings.
src/services/spec-loader.ts	Removes a type assertion on loaded spec and attaches original error as cause on failures.
src/services/reference-transform.ts	Removes a cast when registering transformers under stricter lint rules.
src/handlers/handler-utils.ts	Simplifies property access and removes return type assertions.
src/config.ts	Removes an output format assertion after runtime validation.
test/tests/unit/handlers/top-level-field-handler.test.ts	Removes redundant mock type assertion.
test/tests/unit/handlers/path-item-handler.test.ts	Removes redundant mock type assertion.
test/tests/unit/handlers/operation-handler.test.ts	Removes redundant mock type assertion.
test/tests/unit/handlers/component-map-handler.test.ts	Removes redundant mock type assertion.
test/tests/unit/handlers/component-detail-handler.test.ts	Removes redundant mock type assertion.
test/tests/e2e/spec-loading.test.ts	Preserves parse error cause when JSON parsing fails.
test/tests/e2e/resources.test.ts	Preserves parse error cause when JSON parsing fails.
test/tests/e2e/format.test.ts	Preserves parse error cause when JSON/YAML parsing fails.
package.json	Bumps ESLint/toolchain deps and TypeScript, removes openapi-typescript.
package-lock.json	Lockfile updates reflecting the toolchain dependency changes.

Review details

• Files reviewed: 13/15 changed files
• Comments generated: 2
• Review effort level: Low

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