feat(config): use c12 for loading config files

docs/configuration.md

@@ -5,7 +5,20 @@ description: Configure openapi-ts.
 
 # Configuration
 
-`openapi-ts` supports loading configuration from a file inside your project root directory. You can either create a `openapi-ts.config.cjs` file
+`openapi-ts` supports loading configuration from a file inside your project root directory. Your configuration can be in many formats (as supported by [c12](https://github.com/unjs/c12)). Here are some example configs:
+
+`openapi-ts.config.ts`
+
+```ts
+import { defineConfig } from '@hey-api/openapi-ts'
+
+export default defineConfig({
+  input: 'path/to/openapi.json',
+  output: 'src/client',
+})
+```
+
+`openapi-ts.config.cjs`
 
 ```js
 /** @type {import('@hey-api/openapi-ts').UserConfig} */
@@ -15,7 +28,7 @@ module.exports = {
 }
 ```
 
-or `openapi-ts.config.mjs`
+`openapi-ts.config.mjs`
 
 ```js
 /** @type {import('@hey-api/openapi-ts').UserConfig} */

packages/openapi-ts/package.json

@@ -62,6 +62,7 @@
     },
     "dependencies": {
         "@apidevtools/json-schema-ref-parser": "11.5.4",
+        "c12": "1.10.0",
         "camelcase": "8.0.0",
         "commander": "12.0.0",
         "handlebars": "4.7.8"

packages/openapi-ts/src/index.ts

@@ -1,7 +1,7 @@
-import { existsSync, readFileSync } from 'node:fs';
+import { readFileSync } from 'node:fs';
 import path from 'node:path';
-import { pathToFileURL } from 'node:url';
 
+import { loadConfig } from 'c12';
 import { sync } from 'cross-spawn';
 
 import { parse } from './openApi';
@@ -15,9 +15,6 @@ import { writeClient } from './utils/write/client';
 
 type Dependencies = Record<string, unknown>;
 
-// TODO: add support for `openapi-ts.config.ts`
-const configFiles = ['openapi-ts.config.js', 'openapi-ts.config.cjs', 'openapi-ts.config.mjs'];
-
 // Mapping of all dependencies used in each client. These should be installed in the generated client package
 const clientDependencies: Record<Config['client'], string[]> = {
     angular: ['@angular/common', '@angular/core', 'rxjs'],
@@ -78,20 +75,15 @@ const logMissingDependenciesWarning = (client: Config['client'], dependencies: D
     }
 };
 
-const getConfigFromFile = async (): Promise<UserConfig | undefined> => {
-    const configPath = configFiles
-        .map(file => pathToFileURL(path.resolve(process.cwd(), file)))
-        .find(filePath => existsSync(filePath));
-    if (!configPath) {
-        return;
-    }
-    // @ts-ignore
-    const exported = await import(configPath);
-    return exported.default as UserConfig;
-};
-
 const getConfig = async (userConfig: UserConfig, dependencies: Dependencies) => {
-    const userConfigFromFile = await getConfigFromFile();
+    const { config: userConfigFromFile } = await loadConfig<UserConfig>({
+        jitiOptions: {
+            esmResolve: true,
+        },
+        name: 'openapi-ts',
+        overrides: userConfig,
+    });
+
     if (userConfigFromFile) {
         userConfig = { ...userConfigFromFile, ...userConfig };
     }