Getting Started

Install

The only dependency for ivue is Vue 3, so it is easy to get started.

In your terminal install ivue using:

# yarn
yarn add ivue

# npm
npm i ivue

# pnpm
pnpm i ivue

Install by Copying

ivue is designed to be easily shareable and installable so if you are running TypeScript, you can just copy the ivue.ts into your repo and you are done:

Click to expand the latest ivue source code to copy

ivue.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 {};

Or Copy from GitHub

NOTE

This installation path is recommended only if you quickly want to tinker with the internals of ivue, as you won't be getting the latest updates. Also note that this code comes from github main branch latest which might also be in beta and not fully published to npm.