refactor: code (webpack-contrib#236)

Author: alexander-akait

src/index.js

@@ -4,6 +4,7 @@ const { validate } = require("schema-utils");
 
 const {
   throttleAll,
+  memoize,
   cssnanoMinify,
   cssoMinify,
   cleanCssMinify,
@@ -151,31 +152,6 @@ const { minify: minifyWorker } = require("./minify");
 
 const warningRegex = /\s.+:+([0-9]+):+([0-9]+)/;
 
-/**
- * @template T
- * @param fn {(function(): any) | undefined}
- * @returns {function(): T}
- */
-const memoize = (fn) => {
-  let cache = false;
-  /** @type {T} */
-  let result;
-
-  return () => {
-    if (cache) {
-      return result;
-    }
-    result = /** @type {function(): any} */ (fn)();
-    cache = true;
-    // Allow to clean up memory for fn
-    // and all dependent resources
-    // eslint-disable-next-line no-undefined, no-param-reassign
-    fn = undefined;
-
-    return result;
-  };
-};
-
 const getSerializeJavascript = memoize(() =>
   // eslint-disable-next-line global-require
   require("serialize-javascript")

src/utils.js

@@ -490,8 +490,34 @@ async function swcMinify(input, sourceMap, minimizerOptions) {
   };
 }
 
+/**
+ * @template T
+ * @param fn {(function(): any) | undefined}
+ * @returns {function(): T}
+ */
+function memoize(fn) {
+  let cache = false;
+  /** @type {T} */
+  let result;
+
+  return () => {
+    if (cache) {
+      return result;
+    }
+    result = /** @type {function(): any} */ (fn)();
+    cache = true;
+    // Allow to clean up memory for fn
+    // and all dependent resources
+    // eslint-disable-next-line no-undefined, no-param-reassign
+    fn = undefined;
+
+    return result;
+  };
+}
+
 module.exports = {
   throttleAll,
+  memoize,
   cssnanoMinify,
   cssoMinify,
   cleanCssMinify,

types/utils.d.ts

@@ -17,6 +17,12 @@ export type Postcss = import("postcss").Postcss;
  * @returns {Promise<T[]>} A promise that fulfills to an array of the results
  */
 export function throttleAll<T>(limit: number, tasks: Task<T>[]): Promise<T[]>;
+/**
+ * @template T
+ * @param fn {(function(): any) | undefined}
+ * @returns {function(): T}
+ */
+export function memoize<T>(fn: (() => any) | undefined): () => T;
 /**
  * @param {Input} input
  * @param {RawSourceMap | undefined} sourceMap