Create strict JSON Schema for configuration (standalone for ease of u…

…se) and corresponding strict TypeScript type (via extends for conciseness) (fixes #1248).

demo/markdownlint-browser.js

@@ -3140,6 +3140,13 @@ module.exports = markdownlint;
  * @typedef {import("./configuration").Configuration} Configuration
  */
 
+/**
+ * Configuration object for linting rules strictly. For the JSON schema, see
+ * {@link ../schema/markdownlint-config-schema-strict.json}.
+ *
+ * @typedef {import("./configuration-strict").ConfigurationStrict} ConfigurationStrict
+ */
+
 /**
  * Rule configuration object.
  *

example/typescript/type-check.ts

@@ -164,3 +164,20 @@ markdownlint(options, assertLintResultsCallback);
 (async () => {
   assertLintResultsCallback(null, await markdownlint.promises.markdownlint(options));
 })();
+
+const configuration: markdownlint.Configuration = {
+  "custom-rule": true,
+  "no-hard-tabs": false,
+  "heading-style": {
+    "style": "consistent"
+  }
+};
+assert(configuration);
+const configurationStrict: markdownlint.ConfigurationStrict = {
+  // "custom-rule": true,
+  "no-hard-tabs": false,
+  "heading-style": {
+    "style": "consistent"
+  }
+};
+assert(configurationStrict);