refactor: loadConfigFile

Author: aminya

src/main.ts

@@ -1,4 +1,4 @@
-import { includesAny, getPluginFunction } from "./utils"
+import { includesAny, getPluginFunction, loadConfigFile } from "./utils"
 
 import type resolve from "@rollup/plugin-node-resolve"
 type RollupResolveOptions = Parameters<typeof resolve>[0]
@@ -33,9 +33,6 @@ type RollupAscOptions = Parameters<typeof asc>[0] & Record<string, any>
 import type visualizer from "rollup-plugin-visualizer"
 type RollupVisualizerOptions = Parameters<typeof visualizer>[0]
 
-import { existsSync } from "fs"
-import { join } from "path"
-
 export type Plugin =
   | "js"
   | "ts"
@@ -208,16 +205,9 @@ export function createPlugins(
       : {}
   ) as RollupTerserOptions
   if (typeof configDir === "string") {
-    const terserConfigFile = join(configDir, ".terserrc.js")
-    if (existsSync(terserConfigFile)) {
-      const loadedTerserConfigFile = require(terserConfigFile) as { default: RollupTerserOptions } | RollupTerserOptions
-      if (loadedTerserConfigFile !== undefined) {
-        if ("default" in loadedTerserConfigFile) {
-          terserOptions = loadedTerserConfigFile.default
-        } else {
-          terserOptions = loadedTerserConfigFile
-        }
-      }
+    const maybeConfig = loadConfigFile(configDir, [".terserrc.js", ".terserrc"])
+    if (maybeConfig !== null) {
+      terserOptions = maybeConfig as RollupTerserOptions
     }
   }
   pushPlugin(["terser"], ["rollup-plugin-terser", "terser"], terserOptions, process.env.NODE_ENV === "production")

src/utils.ts

@@ -30,3 +30,23 @@ export function getPluginFunction(modul: any, prop?: string) {
     return pluginFunction
   }
 }
+
+import { existsSync } from "fs"
+import { join } from "path"
+
+export function loadConfigFile(configDir: string, configFiles: Array<string>) {
+  for (const configFile of configFiles) {
+    const terserConfigFile = join(configDir, configFile)
+    if (existsSync(terserConfigFile)) {
+      const loadedTerserConfigFile = require(terserConfigFile) as { default: Record<any, any> } | Record<any, any>
+      if (loadedTerserConfigFile !== undefined) {
+        if ("default" in loadedTerserConfigFile) {
+          return loadedTerserConfigFile.default
+        } else {
+          return loadedTerserConfigFile
+        }
+      }
+    }
+  }
+  return null
+}