Upgrade to Node.js 24 and improve telemetry and completions

[satyakigh]

Summary

This change prepares CloudFormation Language Server v1.11.0 by updating dependencies, adopting Node.js 24, and improving telemetry, feature-flag refreshes, and completion performance.

Changes

Runtime and tooling

• Adopt Node.js 24.x
• Add Node 24 to the existing Node 18/20/22 long-running compatibility matrix.
• Migrate Vitest configuration files from TypeScript to ESM.
• Update the jscpd v5 duplication threshold to 1.4.

Telemetry and error handling

• Suppress expected pino stream and console EPIPE shutdown errors.
• Ensure telemetry shutdown runs even when metric flushing fails.
• Avoid reporting expected client-side failures as service faults.

Feature flags

• Preserve the active configuration when remote refreshes fail.
• Validate remote configurations before updating memory or local storage.
• Keep fetch, parse, and persistence failures as distinct telemetry outcomes.

Completion performance and Bound fuzzy-search

• Derive top-level completion queries from the token at the cursor.
• Bound fuzzy-search queries from malformed parser contexts.
• Skip top-level completions inside YAML comments.
• Record query and candidate-list lengths through dedicated metrics.

Incomplete or malformed templates can produce parser contexts containing an entire syntax node instead of the token at the cursor. Passing that text to Fuse creates unnecessary latency and can also propagate oversized values into completion filterText.

A two-week sample of 1.95M fuzzy searches showed the following latency distribution:

Query length	Searches	Average latency
≤4,096	1,905,000	≤25.8 ms
4,097–10,000	30,254	48.4 ms
10,001–100,000	14,769	179.7 ms
Above 100,000	1,075	3.4 s

[github-code-quality]

Code Coverage Overview

Languages: TypeScript

TypeScript / code-coverage/vitest

The overall line coverage in commit 2b8e3c8 in the fix/telemetry-faults... branch remains at 90%, unchanged from commit 8921369 in the main branch.

Show a line coverage summary of the most impacted files.

File	main 8921369	fix/telemetry-faults... 2b8e3c8	+/-
src/schema/GetS...aTaskManager.ts	100%	100%	0%
src/utils/FuzzySearchUtil.ts	100%	100%	0%
src/telemetry/LoggerFactory.ts	57%	58%	+1%
src/autocomplet...tionProvider.ts	95%	96%	+1%
src/featureFlag...FlagProvider.ts	77%	88%	+11%
src/utils/errors/ErrorLogs.ts	0%	83%	+83%

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_{Updated August 25, 2026 18:10 UTC}