feat(readme): mention the most common schema version

lib/readmeBuilder.js

@@ -10,15 +10,32 @@
  * governing permissions and limitations under the License.
  */
 const {
- map, pipe, filter, list: flist, mapSort,
+ map, pipe, filter, list: flist, mapSort, uniq,
 } = require('ferrum');
 const {
  root, paragraph, text, heading, list, listItem, link, inlineCode,
 } = require('mdast-builder');
+const i18n = require('es2015-i18n-tag').default;
 const s = require('./symbols');
 const { gentitle, gendescription } = require('./formattingTools');
 const { keyword } = require('./keywords');
 
+function makeversionnote(schemas) {
+ const versions = flist(uniq(schemas
+ .map(schema => schema[keyword`$schema`])
+ .filter(e => !!e)));
+
+ if (versions.length === 1) {
+ return [
+ heading(2, text(i18n`Version Note`)),
+ paragraph([
+ text('The schemas linked above follow the JSON Schema Spec version: '),
+ inlineCode(versions[0]),
+ ]),
+ ];
+ }
+ return [];
+}
 
 /**
  * Generate the README.md
@@ -64,6 +81,8 @@ function build({ readme = true }) {
 
  heading(3, text('Arrays')),
  list('unordered', bytype('array')),
+
+ ...makeversionnote(schemas),
  ]);
 
  // console.log(inspect(readmenode));

schemasupport.md

@@ -1,10 +1,10 @@
 # JSON Schema Spec Coverage Report
 
-This report lists the keywords of the JSON Schema spec that are covered in the tests. The overall coverage is 82%
+This report lists the keywords of the JSON Schema spec that are covered in the tests. The overall coverage is 84%
 
 ## The JSON Schema Core Vocabulary
 
-Coverage for [The JSON Schema Core Vocabulary](https://json-schema.org/draft/2019-09/json-schema-core.html#rfc.section.8.1) is 44%.
+Coverage for [The JSON Schema Core Vocabulary](https://json-schema.org/draft/2019-09/json-schema-core.html#rfc.section.8.1) is 55%.
 
 | Keyword | Supported |
 | :----------------- | --------- |
@@ -15,7 +15,7 @@ Coverage for [The JSON Schema Core Vocabulary](https://json-schema.org/draft/201
 | `$recursiveAnchor` | No |
 | `$recursiveRef` | No |
 | `$ref` | Yes |
-| `$schema` | No  |
+| `$schema` | Yes |
 | `$vocabulary` | No |
 
 ## A Vocabulary for Applying Subschemas

test/readmeBuilder.test.js

@@ -35,6 +35,7 @@ describe('Testing Readme Builder', () => {
 
  assertMarkdown(result)
  .contains('# README')
+ .contains('The schemas linked above')
  .fuzzy`
 ## Top-level Schemas