feat(build): add flat config by scope and by category to index.d.ts

src/utils.ts

@@ -1,13 +1,32 @@
 import { kebabCase } from 'scule';
-export function createFlatRulesConfig(rulesModule: { [key: string]: unknown }) {
-  const flatRulesConfig: { [key: string]: unknown } = {}; // Add index signature to allow indexing with a string
+import type { KebabCase } from 'scule';
+
+type WithoutRulesSuffix<T> = T extends `${infer P}Rules` ? P : never;
+
+export function createFlatRulesConfig<
+  InputConfigs extends Record<string, RuleRecord>,
+  RuleRecord extends Record<string, string>,
+  ConfigNameVariable extends keyof InputConfigs,
+  ConfigName extends WithoutRulesSuffix<ConfigNameVariable>,
+  OutputConfigs extends Record<
+    `flat/${KebabCase<ConfigName>}`,
+    {
+      name: string;
+      rules: RuleRecord;
+    }
+  >,
+>(rulesModule: InputConfigs): OutputConfigs {
+  const flatRulesConfig = {} as OutputConfigs;
 
   // Iterate over each property in the rules module
   for (const key of Object.keys(rulesModule)) {
     if (key.endsWith('Rules')) {
       // Ensure the property is a rules set
       const ruleName = kebabCase(key.replace('Rules', ''));
-      const flatKey = `flat/${ruleName}`; // Create the new key
+      const flatKey = `flat/${ruleName}` as `flat/${KebabCase<ConfigName>}`; // Create the new key
+
+      // @ts-ignore TS2322 -- "could be instantiated with a different subtype of constraint".
+      // we do not care at the moment, we only want our index.d.ts to include the names of the config
       flatRulesConfig[flatKey] = {
         name: `oxlint/${ruleName}`,
         rules: rulesModule[key],