feat: sqlCompletion helper to register all completion sources at once

[mscolnick]

What

Registering the SQL completion sources had gotten unwieldy — each of the three schema-aware sources required its own dialect.language.data.of({ autocomplete }) call:

dialect.language.data.of({ autocomplete: createCteCompletionSource({ parser }) }),
dialect.language.data.of({ autocomplete: aliasColumnCompletionSource({ schema, parser, contextAnalyzer }) }),
dialect.language.data.of({ autocomplete: unqualifiedColumnCompletionSource({ schema, parser, contextAnalyzer }) }),

This PR adds a convenience helper that does it in one call:

sqlCompletion({ dialect, schema, parser, contextAnalyzer }),

Details

• New sqlCompletion(config) (src/sql/completion-extension.ts) registers all three completion sources:
  • createCteCompletionSource — CTE names + their output columns
  • aliasColumnCompletionSource — u. → columns of users
  • unqualifiedColumnCompletionSource — SELECT e → email from FROM/JOIN tables
• Shares a single parser and query-context analyzer across the sources so each edit is analyzed once.
• Per-source toggles (enableCteCompletion / enableAliasCompletion / enableColumnCompletion, all default true), mirroring the enable* pattern in sqlExtension.
• Exported from src/index.ts (sqlCompletion, SqlCompletionConfig).
• Demo updated to use the helper.

It's a separate helper from sqlExtension because completion sources must be registered against a specific dialect's language, which sqlExtension doesn't take.

Testing

• New src/sql/__tests__/completion-extension.test.ts verifies the helper registers all three sources by default and honors the enable/disable toggles.
• Updated the exports snapshot in src/__tests__/index.test.ts.
• pnpm run typecheck, pnpm exec oxlint, tests, and pnpm run demo build all pass.

---

Summary by cubic

Introduce sqlCompletion({ dialect, schema, parser, contextAnalyzer }) to register CTE, alias-qualified, and unqualified column completions with one call. This reduces setup to a single extension and reuses one parser/context analyzer for better performance.

• New Features
  • Added sqlCompletion(config) to register createCteCompletionSource, aliasColumnCompletionSource, and unqualifiedColumnCompletionSource against the provided dialect.
  • Shares a single parser and QueryContextAnalyzer; supports enableCteCompletion, enableAliasCompletion, and enableColumnCompletion toggles (default true).
  • Exported sqlCompletion and SqlCompletionConfig; updated demo to use the helper; added tests to verify defaults and toggles.

^{Written for commit c67e464. Summary will update on new commits.}

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	90.97%	1663 / 1828
🔵	Statements	91.12%	1736 / 1905
🔵	Functions	94.71%	233 / 246
🔵	Branches	82.71%	1302 / 1574

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/index.ts	0%	0%	0%	0%
src/sql/completion-extension.ts	100%	100%	100%	100%

Generated in workflow #655 for commit 68ecb20 by the Vitest Coverage Report Action