Extract readConfig logic to a dedicated config.ts module for improved separation of concerns.

src/main.ts

@@ -1,4 +1,4 @@
-import { cwd, readConfig, readFile, writeFile } from "./utils/filesystem";
+import { cwd, readFile, writeFile } from "./utils/filesystem";
 import { context, getOctokit } from "@actions/github";
 import { parse } from "./utils/inputs";
 import { info } from "@actions/core";
@@ -8,6 +8,7 @@ import { setPreview } from "./utils/preview";
 import { setOutputs } from "./utils/outputs";
 import { getPackageManager } from "./utils/packageManagers";
 import { titleCase } from "./utils/strings";
+import { readConfig } from './utils/config'
 
 const previewUpdater = async () => {
     // Inputs

src/utils/config.ts

@@ -0,0 +1,16 @@
+import { Config, defaultConfig } from '../types/config'
+import { deepmerge } from 'deepmerge-ts'
+import * as yaml from 'js-yaml'
+import { readFile } from './filesystem'
+
+export const readConfig = (config: Config, userConfigPath: string): Config => {
+    const content: string = readFile(config, userConfigPath);
+
+    if (content === "") {
+        return <Config>deepmerge(defaultConfig, config);
+    }
+
+    const userConfig = <Config>yaml.load(content);
+
+    return <Config>deepmerge(defaultConfig, userConfig, config);
+};

src/utils/filesystem.ts

@@ -37,18 +37,6 @@ export const writeFile = (
     fs.writeFileSync(filePath(config, filename), content);
 };
 
-export const readConfig = (config: Config, userConfigPath: string): Config => {
-    const content: string = readFile(config, userConfigPath);
-
-    if (content === "") {
-        return <Config>deepmerge(defaultConfig, config);
-    }
-
-    const userConfig = <Config>yaml.load(content);
-
-    return <Config>deepmerge(defaultConfig, userConfig, config);
-};
-
 export const exec = async (command: string): Promise<string> => {
     const execAsync = promisify(nodeExec);
 

tests/unit/filesystem.test.ts

@@ -1,7 +1,7 @@
 import { rawTestConfig } from "../helpers/config";
 import { type Config, defaultConfig } from "../../src/types/config";
-import { readConfig } from "../../src/utils/filesystem";
 import { CONFIG_PATH } from "../../src/utils/inputs";
+import { readConfig } from '../../src/utils/config'
 
 test("read config", () => {
     const data: Config = readConfig(rawTestConfig, CONFIG_PATH.defaultValue);