fix(wrangler): vectorize list and list-metadata-index should output valid json

[MaxwellCalkin]

Fixes #11011.

Follows the same pattern as PR #10517 (which fixed list-vectors --json for #10508).

Problem

wrangler vectorize list --json and wrangler vectorize list-metadata-index --json print a human-readable log message before the JSON output:

📋 Listing Vectorize indexes...
[
  { ... }
]

This makes stdout invalid JSON and breaks piping to jq and other tools.

Fix

Wrap the logger.log() calls in if (!args.json) guards so the log message is suppressed when --json is used — the same one-line pattern applied in #10517 for list-vectors.

list.ts:

-		logger.log(`📋 Listing Vectorize indexes...`);
+		if (!args.json) {
+			logger.log(`📋 Listing Vectorize indexes...`);
+		}

listMetadataIndex.ts:

-		logger.log(`📋 Fetching metadata indexes...`);
+		if (!args.json) {
+			logger.log(`📋 Fetching metadata indexes...`);
+		}

---

• Tests
  • Tests included
  • Tests not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: bugfix
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: v4 only

---

[changeset-bot]

🦋 Changeset detected

Latest commit: 0820900

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[workers-devprod]

Codeowners approval required for this PR:

• @cloudflare/wrangler

Show detailed file reviewers

• packages/wrangler/src/tests/vectorize/vectorize.test.ts: [@cloudflare/wrangler]
• packages/wrangler/src/vectorize/list.ts: [@cloudflare/wrangler]
• packages/wrangler/src/vectorize/listMetadataIndex.ts: [@cloudflare/wrangler]

[devin-ai-integration]

Devin Review found 2 potential issues.

View 2 additional findings in Devin Review.

[devin-ai-integration]

🔴 Empty index list with --json flag outputs no JSON instead of []

When wrangler vectorize list --json is called and there are no indexes, the empty-check at packages/wrangler/src/vectorize/list.ts:33 runs before the JSON output at line 43. This causes the handler to log a warning via logger.warn() and return early without ever outputting JSON. A caller expecting valid JSON on stdout will get an empty string, which is not valid JSON. The fix should move the args.json check before the empty-length check, or output [] for the empty case when --json is set.

(Refers to lines 33-41)

---

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[devin-ai-integration]

🔴 Empty metadata index list with --json flag outputs no JSON instead of []

When wrangler vectorize list-metadata-index <name> --json is called and there are no metadata indexes, the empty-check at packages/wrangler/src/vectorize/listMetadataIndex.ts:34 runs before the JSON output at line 44. This causes the handler to log a warning via logger.warn() and return early without ever outputting JSON. A caller expecting valid JSON on stdout will get an empty string, which is not valid JSON. The fix should move the args.json check before the empty-length check, or output [] for the empty case when --json is set.

(Refers to lines 34-42)

---

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