How it works?
ts
export function ivue<T extends AnyClass>(
className: T,
...args: InferredArgs<T>
): IVue<T>;The main ivue() initializer function uses TypeScript to be able to infer and validate the constrcutor argument types of AnyClass and passes those arguments to the constructor of AnyClass.
ivue allows you to pass any number of arguments into the class constructor(arg1, arg2, arg3, ...etc)
ivue() initializer function returns an extended Vue 3 reactive() object in which getters and setters are internally converted to computeds and adds .toRefs() method to the created object. Computeds auto-unwrap themselves when they are accessed as a reactive object property, so the .value properties and computeds get flattened in the resulting object and do not require .value to be accessed.
ivue replicates native JavaScript / TypeScript class implementation by extending descriptors (getters and setters) up the whole prototype ancestors chain thus supporting classical inheritance.
ivue aims to be opaque and minimal, just doing the minimum to convert a class to a reactive object, leaving the rest to be implemented using Vue 3 Composition API inside an initializer function called .init()
Usage Recommendation
ivue recommends all class properties to be defined as ref() to be able to interoperate with defineExpose(), if you simply pass reactive props which are not Refs through defineExpose(), they will lose reactivity. ref() refs just like computed refs get flattened into the reactive() object, so there is no need to worry about using .value. The ref() refs are necessary just internally for Vue 3 to know which refs to keep reactive, and we just convert the types back to their normal types as if they have no reactivity at all, so Ref<number> is number in ivue, so rather than going in the direction of complexifying the types, we are going in the opposite direction towards simplification.
ivue recommends all class functions, getters and setters to be defined in plain full function style (not arrow functions), this allows all ivue classes to be extensible at any point. By using plain standard functions, getters and setters allows for any getter, setter, function or property to be overriden by extending this class. Arrow functions break full extensibility of classes, so avoid using them inside of classes.
See: More Guidelines
Minimal API Surface Area
ivue() initializer function is the main core function to initialize the ivue reactive objectiref() ref initializer instantiates the Ref but Unwraps its type as the raw type of the Refiuse() function converts the type of composables to they Unwraped raw types.init() method helps initialize the reactive state like watch, onMount, etc..toRefs() method allows to interoperate with Vue 3 Composables
Utility Types help to achieve the rest of ivue capabilities
Click to see the whole latest ivue source code from github main branch below:
ts
/* eslint-disable @typescript-eslint/ban-types */
/* eslint-disable @typescript-eslint/no-explicit-any */
import type { ComputedRef, ExtractPropTypes, Ref, ToRef } from 'vue';
import { computed, reactive, ref, shallowRef, toRef } from 'vue';
import type { Ref as DemiRef } from 'vue-demi';
/** Types */
/**
* IVue core reactive instance type with an extended .toRefs() method added.
*/
export type IVue<T extends AnyClass> = InstanceType<T> & ExtendWithToRefs<T>;
/**
* Extend with .toRefs() method, so that a reactive class can be converted to a composable definition.
*/
export interface ExtendWithToRefs<T extends AnyClass> {
toRefs: IVueToRefsFn<T>;
}
/**
* Type definition for `.toRefs()` method converts reactive class properties to composable .value properties.
* But if props = true OR unwrap = true is specified, the refs will be unwrapped refs to be able to be merged with the the root class properties without losing reactivity.
*/
export interface IVueToRefsFn<T extends AnyClass> {
<P extends keyof InstanceType<T>>(props: P[]): Pick<
IVueRefs<InstanceType<T>>,
P
>;
<P extends keyof InstanceType<T>>(props: P[], unwrap: false): Pick<
IVueRefs<InstanceType<T>>,
P
>;
<P extends keyof InstanceType<T>>(
props: P[],
unwrap: true
): Pick<InstanceType<T>, P>;
(props: true): InstanceType<T>;
(props: false): IVueRefs<InstanceType<T>>;
(): IVueRefs<InstanceType<T>>;
}
/**
* Converts a class properties to a composable .value Refs using ToRef vue type,
* also knows NOT to convert functions to .value Refs but to leave them as is.
*/
export type IVueRefs<T = any> = {
[K in keyof T]: T[K] extends Function ? T[K] : ToRef<T[K]>;
};
/**
* Unwraps Ref Recursively, helps resolve fully the bare value types of any type T
* because sometimes the Refs are returned as they are with `.value` from computeds,
* thus inferring nested ComputedRef<ComputedRef<ComputedRef<Ref>>> types, which
* are difficult to fully resolve to bare values without this utility.
* Also support Vue 3 Demi for vue-use library support.
*/
export type UnwrapRefRecursively<T = any> = T extends Ref | DemiRef
? UnwrapRefRecursively<T['value']>
: T;
/**
* Helper type for Use type, unwraps any type of Vue 3 composable down to its bare types.
*/
export type Unwrap<T> = T extends Ref | DemiRef
? UnwrapRefRecursively<T>
: {
[K in keyof T]: T[K] extends Ref | DemiRef
? UnwrapRefRecursively<T[K]>
: T[K];
};
/**
* Fully unwraps to bare value types any Vue 3 composable return definition type.
*/
export type Use<T = any> = Unwrap<T extends AnyFn ? ReturnType<T> : T>;
/**
* Extracts object defined emit types by converting them to a plain interface
*/
export type ExtractEmitTypes<T extends Record<string, any>> =
UnionToIntersection<
RecordToUnion<{
[K in keyof T]: (evt: K, ...args: Parameters<T[K]>) => void;
}>
>;
/**
* Extract properties as all assigned properties because they have defaults.
*/
export type ExtractPropDefaultTypes<O> = {
[K in keyof O]: ValueOf<ExtractPropTypes<O>, K>;
};
/**
* Extend slots interface T with prefixed 'before--' & 'after--' slots to create fully extensible flexible slots.
*/
export type ExtendSlots<T> = PrefixKeys<T, 'before--'> &
T &
PrefixKeys<T, 'after--'>;
/** Helper Types. */
/**
* Any JavaScript function of any type.
*/
export type AnyFn = (...args: any[]) => any;
/**
* Any JavaScript class of any type.
*/
export type AnyClass = abstract new (...args: any[]) => any;
/**
* Descriptors map type.
*/
export type Descriptors = Map<string, PropertyDescriptor>;
/**
* Computeds hash map type.
*/
export type Computeds = Record<string, ComputedRef>;
/**
* Infer paramaters of a constructor function of a Class.
*/
export type InferredArgs<T> = T extends { new (...args: infer P): any }
? P
: never[];
/**
* Prefix keys of an interface T with a prefix P.
*/
export type PrefixKeys<T, P extends string | undefined = undefined> = {
[K in Extract<keyof T, string> as P extends string ? `${P}${K}` : K]: T[K];
};
/**
* Get Interface's property's function arguments Parmeters<F>
*/
export type IFnParameters<
T extends Record<any, any>,
K extends string
> = Parameters<Required<Pick<T, K>>[K]>;
/**
* Get Interface's [T] property's [P] function arguments Parmeters<F> parameter by key [K]
*/
export type IFnParameter<
T extends Record<any, any>,
P extends keyof T,
K extends number
> = FnParameter<ValueOf<T, P>, K>;
/**
* Get function arguments Parmeters<F> parameter by key K
*/
export type FnParameter<F extends AnyFn, K extends number> = Parameters<F>[K];
/**
* Convert Union Type to Intersection Type.
*/
export type UnionToIntersection<U> = (
U extends any ? (k: U) => void : never
) extends (k: infer I) => void
? I
: never;
/**
* Convert Record to Union Type.
*/
export type RecordToUnion<T extends Record<string, any>> = T[keyof T];
/**
* Gets object T property by key [K].
*/
export type ValueOf<T extends Record<any, any>, K> = T[K];
/** Types End. */
/**
* Store all descriptors for each class prototype processed by
* @see {getAllClassDescriptors}
*/
export const descriptorsMap = new Map();
/**
* Get descriptors of an entire class prototype ancestors chain as a Map.
* Completely emulates JavaScript class inheritance chain for getters and setters.
*
* @param className
* @return {Descriptors}
*/
export function getAllClassDescriptors(className: AnyClass): Descriptors {
/* Retrieve descriptors from cache */
if (descriptorsMap.has(className)) {
return descriptorsMap.get(className);
}
const savedDescriptors: Descriptors = new Map();
let prototype = className.prototype;
while (prototype.constructor !== Object) {
Object.entries(Object.getOwnPropertyDescriptors(prototype)).forEach(
([propertyName, currentDescriptor]) => {
const savedDescriptor = savedDescriptors.get(propertyName);
/** Emulate inheritance chain of getters and setters. */
if (
savedDescriptor !== currentDescriptor &&
(currentDescriptor?.get || currentDescriptor?.set)
) {
/** Overwrite descriptors if they were already set. */
if (savedDescriptor?.get)
currentDescriptor.get = savedDescriptor?.get;
if (savedDescriptor?.set)
currentDescriptor.set = savedDescriptor?.set;
/** Store descriptors. */
savedDescriptors.set(propertyName, currentDescriptor);
}
}
);
/** Walk up the prototype ancestors chain. */
prototype = Object.getPrototypeOf(prototype);
}
/** Save descriptors in the descriptors map for each class. */
descriptorsMap.set(className, savedDescriptors);
return savedDescriptors;
}
/**
* Infinite Vue (ivue) class reactive initializer.
*
* Converts class instance to a reactive object,
* where descriptors are converted to computeds.
*
* You can turn off computed behaviour by adding static
* ivue object and setting the getter props to false.
* class ClassName {
* static ivue = {
* getter: false
* }
* // .getter -> will be a standard JS non-computed getter
* get getter () { return 'hello world'; }
* }
*
* @param className Any Class
* @param args Class constructor arguments that you would pass to a `new AnyClass(args...)`
* @returns {IVue<T>}
*/
export function ivue<T extends AnyClass>(
className: T,
...args: InferredArgs<T>
): IVue<T> {
const descriptors: Descriptors = getAllClassDescriptors(className);
const computeds: Computeds | any = descriptors?.size ? {} : null;
// @ts-expect-error Abstract class initialization
const vue = reactive(new className(...args));
/** Setup descriptors as computeds. */
for (const [prop, descriptor] of descriptors) {
/* If prop exists on static getter className.ivue[prop]
* We do not convert it to computed. Because sometimes
* we want a normal getter. */
if ((className as any)?.ivue?.[prop] === false) continue;
/** Convert descriptor to computed. */
Object.defineProperty(vue, prop, {
get: descriptor.get
? () =>
prop in computeds
? /** Get the existing computed, because we are in reactive scope, .value will auto unwrap itself. */
computeds[prop]
: /** Create the computed and return it, because we are in reactive scope, .value will auto unwrap itself. */
(computeds[prop] = computed({
get: descriptor.get?.bind(vue) as any,
set: descriptor.set?.bind(vue),
} as any))
: undefined,
set: descriptor.set?.bind(vue),
enumerable: false,
});
}
Object.defineProperty(vue, 'toRefs', {
get: () => ivueToRefs(vue, descriptors as Descriptors, computeds),
enumerable: false,
});
/** Run ivue .init() initializer method, if it exists in the class. */
if ('init' in vue) vue.init();
return vue;
}
/**
* Store all props for each class prototype processed by:
* @see {getAllClassProperties}
*/
export const propsMap: Map<object, Set<string> | any> = new Map();
/**
* Get properties of an entire class prototype ancestors chain as a Map.
*/
export function getAllClassProperties(obj: object): Set<string> {
/* Retrieve props from cache */
if (propsMap.has(obj.constructor)) {
return propsMap.get(obj.constructor);
}
const originalConstructor = obj.constructor;
const allProps: Set<string> = new Set();
do {
Object.getOwnPropertyNames(obj).forEach((prop) => {
/* 'caller', 'callee', 'arguments', 'constructor' are
* special object properties, so should be skipped. */
if (!['caller', 'callee', 'arguments', 'constructor'].includes(prop)) {
allProps.add(prop);
}
});
obj = Object.getPrototypeOf(obj);
} while (obj.constructor !== Object);
/** Save props in the props map. */
propsMap.set(originalConstructor, allProps);
return allProps;
}
/**
* `iref()` is an alias for Vue ref() function but returns an unwrapped type without the .value
* `iref()` does not alter the behavior of ref(), but simply transforms the type to an unwrapped raw value.
* @param val T
* @returns {T}
*/
export const iref = ref as <T = any>(value?: T) => T;
/**
* `ishallowRef()` is an alias for Vue shallowRef() function but returns an unwrapped type without the .value
* `ishallowRef()` does not alter the behavior of shallowRef(), but simply transforms the type to an unwrapped raw value.
* @param val T
* @returns {T}
*/
export const ishallowRef = shallowRef as <T = any>(value?: T) => T;
/**
* Three modes of operation:
* 1. `iuse(useComposable(arg, arg2, arg3, ...))` converts the return types of a Composable / Ref to pure raw unwrapped type definition.
* Returns for all properties of an object an unwrapped raw type definition,
* unwraps direct Refs & ComputedRefs as well down to their raw types.
*
* 2. `iuse(useComposable, arg, arg2, arg3, ...)` for cleaner syntax for #1, it does exactly the same thing but
* here the TypeScript inference works for composable function arguments to assist you with intellisence,
* like they work for constructor arguments in the cause of `ivue()` core function,
* making the API cleaner to look at and make it compatible with how this function operates with classes, see #3.
*
* 3. `iuse(AnyClass, ...args)` If AnyClass is supplied and that class's arguments into `iuse(AnyClass, ...args)`,
* it returns an 'ivue(AnyClass, ...args).toRefs()` object for all properties but casts
* their types as raw (no-Ref) types to fit with reactive() structure of the ivue class context.
*/
export function iuse<T extends AnyClass | AnyFn | Object | any>(
classFunctionObject?: T,
...args: T extends AnyClass
? InferredArgs<T>
: T extends AnyFn
? Parameters<T extends (...args: any[]) => any ? T : any>
: any
): T extends AnyClass ? InstanceType<T> : Use<T> {
return typeof classFunctionObject === 'function'
? isClass(classFunctionObject)
? /** Run IVUE but return full Refs, yet property 'true' makes `.toRefs(true)` cast the type to the unwrapped raw type definition instead of a `.value` Ref. */
ivue(
classFunctionObject as T extends AnyClass ? T : any,
...(args as InferredArgs<T extends AnyClass ? T : any>)
).toRefs(true)
: /** Run Vue 3 Standard Composable but also unwrap it to bare raw types. */
(classFunctionObject as AnyFn)(
...(args as Parameters<T extends AnyFn ? AnyFn : any>)
)
: (classFunctionObject as unknown as Unwrap<T>) /** Unwrap any other Object or any type down to its bare types. */;
}
/**
* Convert reactive ivue class to Vue 3 refs.
*
* @param vue @see IVue
* @param descriptors @see Descriptors
* @param computeds @see Computeds
* @returns {ExtendWithToRefs<T>['toRefs']}
*/
function ivueToRefs<T extends AnyClass>(
vue: IVue<T>,
descriptors: Descriptors,
computeds: Computeds
): ExtendWithToRefs<T>['toRefs'] {
return function (
props?: (keyof InstanceType<T>)[] | boolean,
unwrap?: boolean /** This property helps with TypeScript function definition overloading of return types and is not being used inside the function itself. */
): any /** @see {ReturnType<IVueToRefsFn<T>>} */ {
/** Resulting refs store. */
const result: Record<string | number | symbol, any> = {};
/** Output specific props only, if props are specified. */
if (Array.isArray(props)) {
for (let i = 0; i < props.length; i++) {
const prop = props[i] as any;
/** Handle descriptors. */
if (descriptors.has(prop)) {
if (prop in computeds) {
/** Return vue computed with .value from computeds store. */
result[prop] = computeds[prop];
} else {
/** Initialize & store vue computed. */
const descriptor = descriptors.get(prop);
result[prop] = computeds[prop] = computed({
get: descriptor?.get?.bind(vue) as any,
set: descriptor?.set?.bind(vue),
} as any);
}
} else {
/** Handle methods. */
if (typeof vue[prop] === 'function') {
/** Bind method to vue, makes method destructuring point to right instance. */
result[prop] = vue[prop].bind(vue);
} else {
/** Convert simple reactive prop to a Ref. */
result[prop] = toRef(vue, prop);
}
}
}
} else {
/** Convert all props to refs and leave functions as is. */
let allProps: null | Set<string> = new Set(getAllClassProperties(vue));
/** Convert descriptors (non enumerable by default in JS). */
descriptors.forEach((descriptor, prop) => {
if (prop in computeds) {
/** Return vue computed with .value from computeds store. */
result[prop] = computeds[prop];
} else {
/** Initialize vue computed ref & store it in result. */
result[prop] = computeds[prop] = computed({
get: descriptor.get?.bind(vue) as any,
set: descriptor.set?.bind(vue),
} as any);
}
/** Delete descriptor from props as it was already processed. */
allProps?.delete(prop as string);
});
allProps.forEach((prop) => {
if (typeof vue[prop] === 'function') {
/** Bind method to vue, makes method destructuring point to right instance. */
result[prop] = vue[prop].bind(vue);
} else {
/** Convert simple reactive prop to a Ref. */
result[prop] = toRef(vue, prop);
}
});
/** Memory optimization. */
allProps = null;
}
return result as any;
};
}
/**
* Vue props interface in defineComponent() style.
*/
export type VuePropsObject = Record<
string,
{ type: any; default?: any; required?: boolean }
>;
/**
* Vue Props with default properties declared as existing and having values.
*/
export type VuePropsWithDefaults<T extends VuePropsObject> = {
[K in keyof T]: {
type: T[K]['type'];
default: T[K]['default'];
required?: boolean;
};
};
/**
* Determines if the value is a JavaScript Class.
* Note that class is a class function in JavaScript.
*
* @param val Any value
* @returns boolean If it's a JavaScript Class returns true
*/
export function isClass(val: any): boolean {
if (typeof val !== 'function') return false; // Not a function, so not a class function either
if (!val.prototype) return false; // Arrow function, so not a class
// Finally -> distinguish between a normal function and a class function
if (Object.getOwnPropertyDescriptor(val, 'prototype')?.writable) {
// Has writable prototype
return false; // Normal function
} else {
return true; // Class -> Not a function
}
}
/**
* Creates props with defaults in defineComponent() style.
*
* Merge defaults regular object with Vue types object
* declared in defineComponent() style.
*
* This is made so that the defaults can be declared "as they are"
* without requiring objects to be function callbacks returning an object.
*
* // You don't need to wrap objects in () => ({ nest: { nest :{} } })
* // You can just delcare them normally.
* const defaults = {
* nest: {
* nest
* }
* }
*
* This function will create the Vue expected callbacks for Objects, Arrays & Classes
* but leave primitive properties and functions intact so that
* the final object is fully defineComponent() style compatible.
*
* @param defaults Regular object of default key -> values
* @param typedProps Props declared in defineComponent() style with type and possibly required declared, but without default
* @returns Props declared in defineComponent() style with all properties having default property declared.
*/
export function propsWithDefaults<T extends VuePropsObject>(
defaults: Record<string, any>,
typedProps: T
): VuePropsWithDefaults<T> {
for (const prop in typedProps) {
if (typeof defaults?.[prop] === 'object' && defaults?.[prop] !== null) {
/** Handle Arrays & Objects -> wrap them with an arrow function. */
typedProps[prop].default = () => defaults?.[prop];
} else {
if (isClass(defaults?.[prop])) {
/** Handle JavaScript Classes -> wrap them with an arrow function */
typedProps[prop].default = () => defaults?.[prop];
} else {
/** Handle JavaScript Function And All primitive properties -> output directly */
typedProps[prop].default = defaults?.[prop];
}
}
}
return typedProps as VuePropsWithDefaults<T>;
}
/** Necessary ivue.ts to be treated as a module. */
export {};100% Vue 3 Compatible
.toRefs() allows the object to be converted to Vue 3 native composable structure with full .values, so it can interoperate with native composables if needed. .toRefs() is also often used to get refs for v-bind() in css styles.
100% TypeScript Support
ivue is on the cutting edge of TypeScript and owes its capabilities to the latest developments in TypeScript.
ivue provides a set of utility types to make working with Vue 3 even easier and more scalable.
100% Unit Tested Architecture
At the current stage all of the code that is used to build ivue is 100% tested with 100% coverage, and aims to keep being at 100% always.
You can clone the project and run yarn test yourself and examine the tests.
Zero Dependencies
ivue has zero dependencies except Vue 3.