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validate-config-examples

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更新日2026年7月2日 07:02

Validate Mergify YAML configuration examples embedded in the docs against the real Mergify schema, so broken config snippets never ship. Use after editing docs pages that contain .mergify.yml / YAML examples, when reviewing a docs PR with config snippets, or when asked to check/validate config examples in the docs. Extracts YAML code fences, classifies them, and validates full Mergify configs with `mergify config validate` (optionally via the mergify:mergify-config skill when that plugin is installed).

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Mergifyio

Mergifyio/docs

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Validate Config Examples

Mergify config snippets in the docs are the most-copied content on the site. A broken example erodes trust instantly. A config-examples CI job validates them on every PR; this skill is how you run the same check locally and fix what it finds.

Run it

pnpm check:config-examples          # validate everything under src/content/docs

Under the hood this runs node scripts/validate-config-examples.mjs. It scans MDX for yaml / yml fences, classifies each, YAML-parses the complete Mergify configs, and validates them against public/mergify-configuration-schema.json with Ajv. Exit code is non-zero if any example is invalid; each failure prints as file:line — <error>.

To validate only the files you touched, pass paths:

node scripts/validate-config-examples.mjs src/content/docs/merge-queue

To inspect the classification (which blocks are validated vs skipped and why), use --json:

node scripts/validate-config-examples.mjs --json src/content/docs | jq '.[] | {file, line, classification}'

What gets validated vs skipped

The script validates a block only when it is a complete Mergify config — i.e. it has an unindented top-level key from the config schema (queue_rules, pull_request_rules, merge_protections, merge_protections_settings, scopes, defaults, commands_restrictions, extends, shared, ...).

It automatically skips:

Fragments — a snippet with no top-level key (e.g. a single rule or a bare list of conditions shown inline). Cannot be validated as a whole config.
... placeholders — any block containing a bare ... line is treated as deliberately incomplete.
GitHub Actions / other CI YAML — detected by on: + jobs:/steps:/etc.
Anything marked # partial in its first lines.

For a block that looks like a full config but should not be validated — most often deprecated syntax shown in a migration guide — put a reader-invisible MDX comment on the line before the fence:

{/* validate-config-examples: skip — deprecated partition_rules syntax, shown for migration */}

```yaml
partition_rules:
  ...
```

Do not skip a block just to make CI pass. If an example is meant to be a real, copy-pasteable config, fix it instead.

Fixing failures

invalid YAML: ... — the snippet isn't valid YAML. The most common cause is an unquoted Mergify template at the start of a value ({{ ... }} or a leading @): message: @{{author}} ... must be message: "@{{author}} ...", and bot_account: {{ author }} must be bot_account: "{{ author }}".
/ must NOT have additional properties — an unknown or misspelled key at the top level (or a deprecated top-level key). Fix the key, or mark the block skipped if the old syntax is shown on purpose.
/path must be <type> — a value has the wrong type or shape. Match the schema.

Fix clear errors directly in the MDX. For anything ambiguous, flag it rather than guess — a wrong "fix" to a config example is worse than a flagged one.

Scope, guardrails & limitations

Validation is structural (keys, types, shapes). It does not check the semantics of condition expressions (base=main), nor Mergify's custom string formats (duration, template) — a generic JSON-Schema duration validator would wrongly reject valid values like checks_timeout: 5 min, so all format keywords are intentionally ignored. For deep semantic validation of a single config, mergify config validate --config-file <file> (the mergify:mergify-config skill) remains authoritative — but it fetches the schema from docs.mergify.com, so it is not used in CI.
The schema at public/mergify-configuration-schema.json is kept fresh by an automated sync ("chore: sync Mergify JSON Schema files"); the check always runs against the copy in the repo, so a PR is validated against its own schema.
Only yaml/yml fences are considered. Never edits src/content/changelog/.
Fix only genuine errors; leave valid examples alone.

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name

validate-config-examples

description

Validate Config Examples

Run it

pnpm check:config-examples          # validate everything under src/content/docs

To validate only the files you touched, pass paths:

node scripts/validate-config-examples.mjs src/content/docs/merge-queue

To inspect the classification (which blocks are validated vs skipped and why), use --json:

node scripts/validate-config-examples.mjs --json src/content/docs | jq '.[] | {file, line, classification}'

What gets validated vs skipped

It automatically skips:

Fragments — a snippet with no top-level key (e.g. a single rule or a bare list of conditions shown inline). Cannot be validated as a whole config.
... placeholders — any block containing a bare ... line is treated as deliberately incomplete.
GitHub Actions / other CI YAML — detected by on: + jobs:/steps:/etc.
Anything marked # partial in its first lines.

{/* validate-config-examples: skip — deprecated partition_rules syntax, shown for migration */}

```yaml
partition_rules:
  ...
```

Do not skip a block just to make CI pass. If an example is meant to be a real, copy-pasteable config, fix it instead.

Fixing failures

invalid YAML: ... — the snippet isn't valid YAML. The most common cause is an unquoted Mergify template at the start of a value ({{ ... }} or a leading @): message: @{{author}} ... must be message: "@{{author}} ...", and bot_account: {{ author }} must be bot_account: "{{ author }}".
/ must NOT have additional properties — an unknown or misspelled key at the top level (or a deprecated top-level key). Fix the key, or mark the block skipped if the old syntax is shown on purpose.
/path must be <type> — a value has the wrong type or shape. Match the schema.

Fix clear errors directly in the MDX. For anything ambiguous, flag it rather than guess — a wrong "fix" to a config example is worse than a flagged one.

Scope, guardrails & limitations

Validation is structural (keys, types, shapes). It does not check the semantics of condition expressions (base=main), nor Mergify's custom string formats (duration, template) — a generic JSON-Schema duration validator would wrongly reject valid values like checks_timeout: 5 min, so all format keywords are intentionally ignored. For deep semantic validation of a single config, mergify config validate --config-file <file> (the mergify:mergify-config skill) remains authoritative — but it fetches the schema from docs.mergify.com, so it is not used in CI.
The schema at public/mergify-configuration-schema.json is kept fresh by an automated sync ("chore: sync Mergify JSON Schema files"); the check always runs against the copy in the repo, so a PR is validated against its own schema.
Only yaml/yml fences are considered. Never edits src/content/changelog/.
Fix only genuine errors; leave valid examples alone.