Class util refactoring

src/class.ts

@@ -1,68 +0,0 @@
-import { AbstractClass } from "type-fest"
-
-
-/**
- * Copies all own properties and methods (excluding "length" and "prototype") of one class to another class.
- *
- * @param from The class whose properties and methods are to be copied.
- * @param to The class to which the properties and methods are to be copied.
- */
-export function copyClassProperties(
-    from:  AbstractClass<any, any>,
-    to:    AbstractClass<any, any>,
-) {
-    Object.getOwnPropertyNames(from).forEach(name => {
-        if (name === "length"
-         || name === "prototype"
-        )
-            return
-
-        Object.defineProperty(
-            to,
-            name,
-            Object.getOwnPropertyDescriptor(from, name) || Object.create(null),
-        )
-    })
-
-    Object.getOwnPropertyNames(from.prototype).forEach(name => {
-        Object.defineProperty(
-            to.prototype,
-            name,
-            Object.getOwnPropertyDescriptor(from.prototype, name) || Object.create(null),
-        )
-    })
-}
-
-export const flattenClass = <
-    C extends AbstractClass<any, any>
->(class_: C) =>
-    getInheritanceHierarchy(class_)
-        .reduce((flattened, current) => {
-            copyClassProperties(current, flattened)
-            return flattened
-        }, class {}) as C
-
-/**
- * Returns an array of classes representing the inheritance hierarchy of a given class constructor. The array includes the given class constructor itself and all its parent classes in the order of inheritance.
- *
- * @param class_ The class constructor for which to generate the inheritance hierarchy.
- * @returns An array of class constructors representing the inheritance hierarchy of `Class`.
- */
-export function getInheritanceHierarchy(
-    class_: AbstractClass<any, any>
-): AbstractClass<any, any>[] {
-    const parent = Object.getPrototypeOf(class_)
-
-    return isClass(parent)
-        ? [...getInheritanceHierarchy(parent), class_]
-        : [class_]
-}
-
-/**
- * Determines whether a given value is a class constructor or not by checking if its `toString` method returns a string matching the pattern of a class definition.
- *
- * @param el The value to check for class constructor status.
- * @returns A boolean indicating whether `el` is a class constructor or not.
- */
-export const isClass = (el: { toString: () => string }) =>
-    Boolean(el.toString().match(/^class(?: [.\S]+)?(?: extends [.\S]+)? {[\s\S]*}$/))

src/index.ts

@@ -1,3 +1 @@
-export * from "./class"
 export * from "./trait"
-export * from "./utils"

src/trait.ts

@@ -1,6 +1,5 @@
 import { AbstractClass, Class, UnionToIntersection } from "type-fest"
-import { copyClassProperties, flattenClass } from "./class"
-import { StaticMembers } from "./utils"
+import { StaticMembers, copyClassProperties, flattenClass } from "./util/class"
 
 
 export type Trait<T> =

src/util/class.ts

@@ -0,0 +1,90 @@
+import { AbstractClass } from "type-fest"
+
+
+/**
+ * Represents the static members of a class.
+ *
+ * @template C - The type of the class for which static members are extracted.
+ * @typeparam The static members of the class.
+ */
+export type StaticMembers<C> = Pick<C, keyof C>
+
+
+/**
+ * Copies properties from one class to another, including static and prototype properties.
+ *
+ * @param from - The source class to copy properties from.
+ * @param to - The destination class to copy properties to.
+ */
+export function copyClassProperties(
+    from:  AbstractClass<any, any>,
+    to:    AbstractClass<any, any>,
+) {
+    Object.getOwnPropertyNames(from).forEach(name => {
+        if (name === "length"
+         || name === "prototype"
+        )
+            return
+
+        Object.defineProperty(
+            to,
+            name,
+            Object.getOwnPropertyDescriptor(from, name) || Object.create(null),
+        )
+    })
+
+    Object.getOwnPropertyNames(from.prototype).forEach(name => {
+        Object.defineProperty(
+            to.prototype,
+            name,
+            Object.getOwnPropertyDescriptor(from.prototype, name) || Object.create(null),
+        )
+    })
+}
+
+
+/**
+ * Flattens the inheritance hierarchy of a given class by copying all properties
+ * from its superclass chain into a single object.
+ *
+ * @template C - The type of the class to be flattened, extending AbstractClass<any, any>.
+ * @param C - The class to be flattened.
+ * @returns A new class with properties flattened from the entire inheritance hierarchy.
+ */
+export function flattenClass<
+    C extends AbstractClass<any, any>
+>(class_: C) {
+    return getInheritanceHierarchy(class_)
+        .reduce((flattened, current) => {
+            copyClassProperties(current, flattened)
+            return flattened
+        }, class {}) as C
+}
+
+
+/**
+ * Retrieves the inheritance hierarchy of a given class, including itself.
+ *
+ * @param class_ - The class for which the inheritance hierarchy is retrieved.
+ * @returns An array representing the inheritance hierarchy.
+ */
+export function getInheritanceHierarchy(
+    class_: AbstractClass<any, any>
+): AbstractClass<any, any>[] {
+    const parent = Object.getPrototypeOf(class_)
+
+    return isClass(parent)
+        ? [...getInheritanceHierarchy(parent), class_]
+        : [class_]
+}
+
+
+/**
+ * Checks if a given element appears to be a class based on its string representation.
+ *
+ * @param el - The element to check for being a class.
+ * @returns `true` if the element is likely a class; otherwise, `false`.
+ */
+export function isClass(el: { toString: () => string }) {
+    return Boolean(el.toString().match(/^class(?: [.\S]+)?(?: extends [.\S]+)? {[\s\S]*}$/))
+}

src/utils.ts

@@ -1 +0,0 @@
-export type StaticMembers<C> = Pick<C, keyof C>