Packages

Useful and simple to use packages based on the angular.io.

Package	Description	Status	Readme
change-detection	Improve application performance.	In Progress	Readme
prism	`Prism` highlighter module.	In Progress	Readme
property	Features to handle object properties.	In Progress	Readme
ui	User interface.	In Progress	Github
type	Common types, type guards and type checkers.		Github \| npm

angular-package/property

Features to handle properties.

/**
 * Object.
 */
import {
  get
} from '@angular-package/property';

/**
 * Function.
 */
import {
  getDescriptor,
  getDescriptors,
  getExistProperty,
  getProperties,
  getProperty,
  setProperty,
} from '@angular-package/property';

/**
 * Descriptor.
 */
// Class.
import {
  AccessorDescriptors,
  DataDescriptors,
  Descriptor
} from '@angular-package/property';
// Interface.
import {
  AccessorDescriptor,
  CommonDescriptor,
  DataDescriptor
} from '@angular-package/property';

// Type.
import {
  ThisAccessorDescriptor
} from '@angular-package/property';

Installation
Callback
Object
- get
Function
Package
- Descriptor
Git
- Commit
- Versioning
License

How angular-package understands

Check

Is to check the provided argument to be the same as expected.

Type guard (constrain)

Is to constrain the parameter type to not let input unexpected value in the code editor.

Guard

Is a combination of both above to guard type in the code editor and in the provided argument by checking it.

Installation

Install @angular-package/property package with command:

npm i --save @angular-package/property

Callback

Wrapper for the ResultCallback type function to throw an Error with the specified message on the specified false or true state.

const errorCallback: ErrorCallback  = (
  message: string,
  on: boolean = false
): ResultCallback => {
  return (result: boolean, value: any): boolean => {
    if (result === on) {
      throw new Error(
        `${message}, got value ${
          is.object(value) ? JSON.stringify(value) : value
        }`
      );
    }
    return result;
  };
};

Object

`get`

Description:

Get object with all prefixed with get functions.

const get: Get = {
  descriptor: getDescriptor,
  descriptors: getDescriptors,
  existProperty: getExistProperty,
  object: getObject,
  properties: getProperties,
  property: getProperty
};

Function

`getDescriptor()`

Description:

Wrapper function for the Object static method getOwnPropertyDescriptor(). Use getDescriptor() or get.descriptor() to return descriptor of the specified property from the specified object.

Gets the own property descriptor of the specified object. An own property descriptor is one that is defined directly on the object and is not inherited from the object's prototype.

Features:

Additional features instead of the default from the wrapped getOwnPropertyDescriptor() method.

Constraints the object parameter with a generic Obj variable of an object type.
Constraints the key parameter with a Key variable which is of a key of the Obj variable.

Import:

import { get, getDescriptor } from '@angular-package/property';

Syntax:

const getDescriptor: GetDescriptor = <Obj extends object, Key extends keyof Obj>(
  object: Obj,
  key: Key
): PropertyDescriptor | undefined;

Generic type variables:

Name	Description
`Obj extends object`	Constrained with the `object` type, by default of the value from the captured type of the provided `object`
`Key extends keyof Obj`	Constrained with the property name from the `Obj` variable to ensure to not grab accidentally a property that does not exist in the `Obj`, by default of the value from the provided `key`

Parameters:

Name: `type`	Description
`object: Obj`	An `object` of a generic `Obj` type, by default of the type captured from the provided `object`, to get the property descriptor from it. The value is not being checked against the proper `object` type
`key: Key`	A `keyof` type property name from the `object`, by default of type captured from the provided `key` as the name of the property that the `object` contains. The value is not being checked against its existence in the `object`

Throws:

Function throws nothing.

Returns:

Returns	Type	Description
`PropertyDescriptor \| undefined`	`object`	-

The return value is a property descriptor from the object.

Usage:

// Example usage.
import { get, getDescriptor } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = 'first name';
  age = 5;
}

class People {
  firstName!: string;
  age!: number;
}

const person: Person = new Person();
const people: People = new People();

getDescriptor(person, 'firstName'); // Returns {value: "first name", writable: true, enumerable: true, configurable: true}
getDescriptor(people, 'age'); // Returns undefined

const noProperty: any = 'no property';
const noObject: any = 'my string object';

getDescriptor(person, noProperty); // Returns undefined,
                                   // It won't give you any `Error`, it's like an object has property with undefined value.
getDescriptor(noObject, 'age'); // Returns undefined
                                // The same here.

`getDescriptors()`

Description:

Wrapper function for the Object static method getOwnPropertyDescriptors(). Use getDescriptors() or get.descriptors() to return all property descriptors from the specified object.

Returns an object containing all own property descriptors of an object.

Features:

Additional features instead of the default from the wrapped getOwnPropertyDescriptors() method.

Constraints the object parameter with a generic Obj variable of an object type.

Import:

import { get, getDescriptors } from '@angular-package/property';

Syntax:

const getDescriptors: GetDescriptors = <Obj extends object, Keys extends keyof Obj>(
  object: Obj,
  keys?: Keys[] // Not working in this version.
): ObjectPropertyDescriptors<Obj> | undefined;

Generic type variables:

Name	Description
`Obj extends object`	Constrained with the `object` type, by default of the value from the captured type of the provided `object`

Parameters:

Name: `type`	Description
`object: Obj`	An `object` of a generic `Obj` type, by default of the type captured from the provided `object`, to get all property descriptors from it. The value is being checked against the proper `object` type
`keys?: Keys[]`	not working

Returns:

Returns	Type	Description
`ObjectPropertyDescriptors<Obj> \| undefined`	`object`	-

The return value is an object with all property descriptors from the object.

Usage:

// Example usage.
import { get, getDescriptors } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = 'first name';
  age = 5;
}

class People {
  firstName!: string;
  age!: number;
}

const person: Person = new Person();
const people: People = new People();

getDescriptors(person); // Returns {firstName: {…}, age: {…}}
getDescriptors(people); // Returns {}

`getExistProperty()`

Description:

Use getExistProperty() or get.existProperty() to return the value of the existing specified property from the specified object.

Features:

Guards getting the object property value by:
- Constraints the object parameter with a generic Obj variable of an object type.
- Constraints the key parameter with a Key variable which is of a key of the Obj variable.
- Checks whether the provided object is of an object type and key of a Key type, and if not, throws an Error.
- Checks whether the provided object has own property by using Object.prototype.hasOwnProperty() method.
Possibility to use custom callback function of a ResultCallback type.

Import:

import { get, getExistProperty } from '@angular-package/property';

Syntax:

const getExistProperty: GetExistProperty = <
  Obj extends object,
  Key extends keyof Obj
>(
  object: Obj,
  key: Key,
  callback: ResultCallback = callbacks.getExistProperty
): Obj[Key] =>
  guard.is.objectKey(object, key, callback)
    ? getProperty(object, key)
    : getProperty(object, key);

Generic type variables:

Name	Description
`Obj extends object`	Guarded with the `object` type, by default of the value from the captured type of the provided `object` linked with the return type `Obj[Key]`
`Key extends keyof Obj`	Guarded with the property name from the `Obj` variable to ensure to not grab accidentally a property that does not exist in the `Obj`, by default of the value from the `key` argument that's linked to the return type `Obj[Key]`

Parameters:

Name: `type`	Description
`object: Obj`	An `object` of a generic `Obj` type, by default of the type captured from the provided `object`, to get the existing property value from it. The value is being checked against the proper `object` type
`key: Key`	A `keyof` type property name from the existing `object`, by default of type captured from the provided `key` as the name of the property that the `object` contains. The value is being checked against its existence in the `object`

Throws:

By default throws an Error if the specified object does not exist or the object exists, but its key doesn't.

Returns:

Returns	Type	Description
`Obj[Key]`	Captured	The return type is of type captured from the property value from the `object`

The return value is a property value from the object.

Usage:

// Example usage.
import { get, getExistProperty } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = 'first name';
  age = 5;
}

class People {
  firstName!: string;
  age!: number;
}

const person: Person = new Person();
const people: People = new People();

getExistProperty(person, 'firstName'); // Returns 'first name'
getExistProperty(people, 'age'); // Uncaught Error: Object with the specified key does not exist, got value {}
// Custom callback.
getExistProperty(people, 'age', (result: boolean, value: any) => {
  console.log(result); // `result` of the check is equal to the `false`
  console.log(value); // `value` is equal to `{}` - object is empty
  return result;
}); // Returns `undefined`, does not throws an Error cause of custom callback.

`getProperties()`

Description:

Use getProperties() or get.properties() to get specified properties from the specified object.

Features:

Constraints the object parameter with a generic Obj variable of an object type.
Constraints the key parameter with a Key variable which is of a key of the Obj variable.
Checks whether the provided object is of an object type and key of a Key type, and if not, throws an Error.
Checks whether the provided object has own property by using Object.prototype.hasOwnProperty() method.
Uses custom callback function of a ResultCallback type.
Returns an object with the specified properties from the specified object.

Import:

import { get, getProperties } from '@angular-package/property';

Syntax:

const getProperties: GetProperties = <
  Obj extends object,
  Keys extends keyof Obj
>(
  object: Obj,
  keys: Keys[]
): Pick<Obj, Keys> =>
  Object.assign(
    {},
    ...keys.map((key) =>
      !is.undefined(object[key]) ? { [key]: object[key] } : undefined
    )
  );

Generic type variables:

Name	Description
`Obj extends object`	Constrained with the `object` type, `Obj` variable by default of the value from the captured type of the provided `object` that is linked with the return type `Pick<Obj, Keys>`
`Keys extends keyof Obj`	Constrained with the property name from the `Obj` variable to ensure to not grab accidentally a properties that does not exist in the `Obj`, by default of the value from the provided `key` that's linked to the return type `Pick<Obj, Keys>`

Parameters:

Name: `type`	Description
`object: Obj`	An `object` of a generic `Obj` type, by default of the type captured from the provided `object`, to get the values of the specified `keys` from it. The value is not being checked against the proper `object` type
`keys: Keys[]`	An array of a `keyof` type property names from the `object`, by default of type captured from the provided `keys` in the array as the names of the properties that the `object` contains. The value is not being checked against the proper `key` type

Returns:

Returns	Type	Description
`Pick<Obj, Keys>`	`object`	The return type is an `object` of a generic `Obj` type, by default of type captured from the provided `object` with picked properties from the `keys`

The return value is an object with the specified properties.

Usage:

// Example usage.
import { getProperties } from '@angular-package/property';

interface PersonShape {
  firstName: string;
  age: number;
  lastName: string;
}

class Person implements PersonShape {
  firstName = 'first name';
  age = 5;
  lastName = 'last name';
}

class People {
  firstName!: string;
  age!: number;
}

const person: Person = new Person();
const people: People = new People();

getProperties(person, ['age',  'firstName', 'lastName']); // returns {age: 5, firstName: "first name", lastName: "last name"}
getProperties(people, ['age']); // returns {}

`getProperty()`

Description:

Use getProperty() or get.property() to return the value of the specified property from the object.

Import:

import { get, getProperty } from '@angular-package/property';

Syntax:

const getProperty: GetProperty = <
  Obj extends object,
  Key extends keyof Obj
>(
  object: Obj,
  key: Key
): Obj[Key] => object[key];

Generic type variables:

Name	Description
`Obj extends object`	Constrained with the `object` type, `Obj` variable by default of the value from the captured type of the provided `object` linked with the return type `Obj[Key]`
`Key extends keyof Obj`	Constrained with the property name from the `Obj` variable to ensure to not grab accidentally a property that does not exist in the `Obj`, by default of the value from the provided `key` that's linked to the return type `Obj[Key]`

Parameters:

Name: `type`	Description
`object: Obj`	An `object` of a generic `Obj` type, by default of the type captured from the provided `object`, to get property value from it. The value is not being checked against the proper `object` type
`key: Key`	A `keyof` type property name from the `object`, by default of type captured from the provided `key` as the name of the property that the `object` contains. The value is not being checked against proper `key` type

Returns:

Returns	Type	Description
`Obj[Key]`	Captured	The return type is of type captured from the property (`Key`) value from the `object` (`Obj`)

The return value is a property value from the object.

Usage:

// Example usage.
import { getProperty } from '@angular-package/property';

interface PersonShape {
  firstName: string;
  age: number;
  lastName: string;
}

class Person implements PersonShape {
  firstName = 'first name';
  age = 5;
  lastName = 'last name';
}

class People {
  firstName!: string;
  age!: number;
}

const person: Person = new Person();
const people: People = new People();

getProperty(person, 'age'); // Returns 5
getProperty(people, 'age'); // Returns undefined

`setProperty()`

Description:

Sets the value of indicated property by its name in the object.

Import:

import { setProperty } from '@angular-package/property';

Syntax:

const setProperty: SetProperty = <
  Obj extends object,
  Key extends keyof Obj
>(
  object: Obj,
  key: Key,
  value: Obj[Key]
): Obj[Key] => (object[key] = value);

Generic type variables:

Name	Description
`Obj extends object`	Constrained with the `object` type, `Obj` variable by default of the value from the captured type of the argument `object` linked with the return type `Obj[Key]`
`Key extends keyof Obj`	Constrained with the property name from the `Obj` variable to ensure to not grab accidentally a property that does not exist in the `Obj`, by default of the value from the `key` argument that's linked to the return type `Obj[Key]`

Parameters:

Name: `type`	Description
`object: Obj`	An `object` of a generic `Obj` type, by default of the type captured from the provided `object`, to set the value with the indicated `key` as its property name. The value is not checked against the proper `object` type
`key: Key`	A `keyof` type property name from the `object`, by default of type captured from the provided `key` as the name of the property that the `object` contains
`value: Obj[Key]`	The `value` of the type captured from the provided `key` in the provided `object`. The `value` is not checked against the proper type

Returns:

Returns	Type	Description
`Obj[Key]`	Captured	The return type is of type captured from the property (`Key`) value from the `object` (`Obj`)

The return value is the value from the property of the object.

Usage:

// Example usage.
import { setProperty } from '@angular-package/property';

interface PersonShape {
  firstName: string;
  age: number;
  lastName: string;
}

class Person implements PersonShape {
  firstName = 'first name';
  age = 5;
  lastName = 'last name';
}

class People {
  firstName!: string;
  age!: number;
}

const person: Person = new Person();
const people: People = new People();

setProperty(person, 'age', 7); // Returns 7
setProperty(people, 'age', 27); // Returns 27

Descriptor sub package

Descriptor features to import.

// Class.
import {
  AccessorDescriptors,
  DataDescriptors,
  Descriptor,
} from '@angular-package/property';

// Interface.
import {
  AccessorDescriptor,
  DataDescriptor
} from '@angular-package/property';

// Type.
import {
  ThisAccessorDescriptor
} from '@angular-package/property';

Descriptor

Description:

Handles object property descriptor.

Features:

Strictly defines accessor and data descriptor with the defineAccessor() and defineData() static methods.
Strictly sets, and stores accessor and data descriptor with the Descriptor instance respectively set.accessor() and set.data() methods of the instance.
Get privately stored accessor descriptor defined by the set.accessor() method by using get.accessor property of the instance.
Get privately stored data descriptor defined by the set.data() method by using get.data property of the instance.

Strictly means, it guards provided descriptor by checking it against its unique keys and by picking only properties that belong to the appropriate descriptor.

Import:

import { Descriptor } from '@angular-package/property';

Syntax:

Descriptor<Value, Obj = any> { ... }

Descriptor static methods

`Descriptor.defineAccessor()`

Description:

Returns defined accessor descriptor of a ThisAccessorDescriptor<Value, Obj> type, on get or set property detected.

Syntax:

static defineAccessor<Value, Obj>(
  descriptor: ThisAccessorDescriptor<Value, Obj>,
  callback?: ResultCallback
): ThisAccessorDescriptor<Value, Obj> { ... }

Generic type variables:

Name	Description
`Value`	Guards the value type of the `get()` and `set()` methods of the `descriptor` object, and in the return type `ThisAccessorDescriptor<Value, Obj>`
`Obj`	Gives the possibility to use the `this` keyword that refers to the `Obj` variable inside the `get()` and `set()` methods of the `descriptor` object, and in the return type `ThisAccessorDescriptor<Value, Obj>`

Parameters:

Name: `type`	Description
descriptor: `ThisAccessorDescriptor<Value, Obj>`	An `object` of a `ThisAccessorDescriptor<Value, Obj>` type to define with the default values of the `CommonDescriptor`
callback?: `ResultCallback`	An optional `ResultCallback` function to handle the result of the check whether or not the `descriptor` is an `object` with `get` or `set` property, by default it uses `accessorCallback()` function

Throws:

Throws an Error if the descriptor is not an object of a ThisAccessorDescriptor<Value, Obj> type, which means it doesn't contain get or set property.

Returns:

The return value is an object of a ThisAccessorDescriptor<Value, Obj> type.

Usage:

// Example usage.
import { Descriptor } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = '';
}

class People {
  firstName!: string;
}

const person: Person = new Person();
const people: People = new People();

const firstNameDescriptor = Descriptor.defineAccessor<string, Person>({
  configurable: false,
  enumerable: false,
  get(): string {
    return people.firstName;
  },
  set(value: string): void {
    people.firstName = value;
  },
});

// Define the property `firstName` in the `person` object to link with the same property in the `people` object.
// Changes to the property `firstName` in the `person` object affect the property `firstName` in the `people` object.
Object.defineProperty(person, 'firstName', firstNameDescriptor);

`Descriptor.defineData()`

Description:

Returns defined data descriptor of a DataDescriptor<Value> interface, on writable or value property detected.

Syntax:

static defineData<Value>(
  descriptor: DataDescriptor<Value>,
  callback: ResultCallback = dataCallback
): DataDescriptor<Value> { ... }

Generic type variables:

Name	Description
`Value`	Guards the `value` property from the `descriptor` object, and the return type of a `DataDescriptor<Value>` interface

Parameters:

Name: `type`	Description
descriptor: `DataDescriptor<Value>`	An `object` of a `DataDescriptor<Value>` interface to define with the default values of the `CommonDescriptor`
callback?: `ResultCallback`	An optional `ResultCallback` function to handle the result of the check whether or not the `descriptor` is an `object` with `writable` or `value` property, by default it uses `dataCallback()` function

Throws:

Throws an Error if the descriptor is not an object of a DataDescriptor<Value> type, which means it doesn't contain writable or value property.

Returns:

The return value is an object of a DataDescriptor<Value> interface.

Usage:

// Example usage.
import { Descriptor } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = '';
}

class People {
  firstName!: string;
}

const person: Person = new Person();
const people: People = new People();

const firstNameDescriptor = Descriptor.defineData<string>({
  configurable: false,
  enumerable: false,
  writable: false,
  value: people.firstName
});

// Defines the property `firstName` of a type string in the `person` object with the same value as the property in the `people` object.
Object.defineProperty(person, 'firstName', firstNameDescriptor);

`Descriptor.fromObject()`

Description:

Returns property descriptors from the specified detected object.

Syntax:

static fromObject<Obj extends object>(
  object: Obj
): ObjectPropertyDescriptors<Obj> | undefined { ... }

Generic type variables:

Name	Description
`Value`	Constraints the `value` property from the `descriptor` object, and the return type of a `DataDescriptor<Value>` interface

Parameters:

Name: `type`	Description
descriptor: `DataDescriptor<Value>`	An `object` of a `DataDescriptor<Value>` interface to define with the default values of the `CommonDescriptor`
callback?: `ResultCallback`	An optional `ResultCallback` function to handle the result of the check whether or not the `descriptor` is an `object` with `writable` or `value` property, by default it uses `dataCallback()` function

Throws:

Throws an Error if the descriptor is not an object of a DataDescriptor<Value> type, which means it doesn't contain writable or value property.

Returns:

The return value is an object of a DataDescriptor<Value> interface.

Usage:

// Example usage.
import { Descriptor } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = '';
}

class People {
  firstName!: string;
}

const person: Person = new Person();
const people: People = new People();

const firstNameDescriptor = Descriptor.fromObject();

// Defines the property `firstName` of a type string in the `person` object with the same value as the property in the `people` object.
Object.defineProperty(person, 'firstName', firstNameDescriptor);

`Descriptor.fromProperty()`

Description:

Returns property descriptors from the specified detected object.

Syntax:

static fromObject<Obj extends object>(
  object: Obj
): ObjectPropertyDescriptors<Obj> | undefined { ... }

Generic type variables:

Name	Description
`Value`	Guards the `value` property from the `descriptor` object, and the return type of a `DataDescriptor<Value>` interface

Parameters:

Name: `type`	Description
descriptor: `DataDescriptor<Value>`	An `object` of a `DataDescriptor<Value>` interface to define with the default values of the `CommonDescriptor`
callback?: `ResultCallback`	An optional `ResultCallback` function to handle the result of the check whether or not the `descriptor` is an `object` with `writable` or `value` property, by default it uses `dataCallback()` function

Throws:

Throws an Error if the descriptor is not an object of a DataDescriptor<Value> type, which means it doesn't contain writable or value property.

Returns:

The return value is an object of a DataDescriptor<Value> interface.

Usage:

// Example usage.
import { Descriptor } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = '';
}

class People {
  firstName!: string;
}

const person: Person = new Person();
const people: People = new People();

const firstNameDescriptor = Descriptor.fromObject();

// Defines the property `firstName` of a type string in the `person` object with the same value as the property in the `people` object.
Object.defineProperty(person, 'firstName', firstNameDescriptor);

AccessorDescriptors

Description:

Strictly defines, sets, and stores privately property accessor descriptor of a ThisAccessorDescriptor<Value, Obj> type.

Strictly means, methods picks configurable, enumerable, get, set properties from the provided descriptor object.

Features:

Guarded process of defining the object descriptor, but properties are not being checked against proper values.
Strictly defines property accessor descriptor.
Strictly sets, and stores at the same time property accessor descriptor.
Accessor descriptor is of a ThisAccessorDescriptor<Value, Obj> type:
- The return value of the get() function is of a generic Value type.
- The parameter of the set() function is of a generic Value type.
- Keyword this refers to an Obj variable in both get() and set() functions.
Method set() of the instance and static define() picks configurable, enumerable, get, set properties from the provided data.
Get privately stored accessor descriptor defined by the set() method of the instance.

Import:

import { AccessorDescriptors } from '@angular-package/property';

Syntax:

AccessorDescriptors<Value, Obj = any> { ... }

AccessorDescriptors callback

`accessorCallback()`

The default callback function for the AccessorDescriptors.guard() static method that's used to guard provided value.

const accessorCallback: ResultCallback = callbackErrorMessage(
  `Accessor descriptor must be an \`ThisAccessorDescriptor<Value, Obj>\` type`
);

AccessorDescriptors static methods

`AccessorDescriptors.define()`

Description:

Returns defined accessor descriptor of a ThisAccessorDescriptor<Value, Obj> type, on get or set property detected.

Syntax:

static define<Value, Obj>(
  descriptor: ThisAccessorDescriptor<Value, Obj>,
  callback?: ResultCallback
): ThisAccessorDescriptor<Value, Obj> { ... }

Generic type variables:

Name	Description
`Value`	Guards the value type of the `get()` and `set()` functions of the `descriptor` object, and the return type `ThisAccessorDescriptor<Value, Obj>`
`Obj`	Gives the possibility to use the `this` keyword that refers to the `Obj` variable inside the `get()` and `set()` functions of the `descriptor` object, and in the return type `ThisAccessorDescriptor<Value, Obj>`

Parameters:

Name: `type`	Description
`descriptor: ThisAccessorDescriptor<Value, Obj>`	An `object` of a `ThisAccessorDescriptor<Value, Obj>` type to define with the default values of the `CommonDescriptor`
`callback?: ResultCallback`	An optional `ResultCallback` function to handle the result of the check whether or not the `descriptor` is an `object` with `get` or `set` property, by default it uses `accessorCallback()` function

Throws:

Throws an Error if the descriptor is not an object of a ThisAccessorDescriptor<Value, Obj> type, which means it doesn't contain get or set property.

Returns:

The return value is an object of a ThisAccessorDescriptor<Value, Obj> type.

Usage:

// Example usage.
import { AccessorDescriptors } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = '';
}

class People {
  firstName!: string;
}

const person: Person = new Person();
const people: People = new People();

const firstNameDescriptor = AccessorDescriptors.define<string, Person>({
  get(): string {
    return people.firstName;
  },
  set(value: string): void {
    people.firstName = value;
  },
});

// Define the property `firstName` in the `person` object to link with the same property in the `people` object.
// Changes to the property `firstName` in the `person` object affect the property `firstName` in the `people` object.
Object.defineProperty(person, 'firstName', firstNameDescriptor);

AccessorDescriptors Constructor

`AccessorDescriptors()`

Description:

Creates an instance, and optionally sets an accessor descriptor of a ThisAccessorDescriptor<Value, Obj> type.

Syntax:

AccessorDescriptors<Value, Obj>(descriptor?: ThisAccessorDescriptor<Value, Obj>)

Generic type variables:

Name	Description
`Value`	Guards the value type of the `get()` and `set()` functions of the `descriptor` object
`Obj`	Gives the possibility to use the `this` keyword that refers to the `Obj` variable inside the `get()` and `set()` functions of the `descriptor` object

Parameters:

Name: `type`	Description
`descriptor?: ThisAccessorDescriptor<Value, Obj>`	An optional `object` of a `ThisAccessorDescriptor<Value, Obj>` type to initially set accessor descriptor

Usage:

// Example usage.
import { AccessorDescriptors } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = '';
}

class People {
  firstName!: string;
}

const person: Person = new Person();
const people: People = new People();

const firstNameDescriptor = new AccessorDescriptors<string, Person>({
  get(): string {
    return people.firstName;
  },
  set(value: string): void {
    people.firstName = value;
  },
});

AccessorDescriptors instance methods

`AccessorDescriptors.prototype.set()`

Description:

Strictly sets with the last saved descriptor values, and stores privately accessor descriptor of a ThisAccessorDescriptor<Value, Obj> type.

Syntax:

set(
  descriptor: ThisAccessorDescriptor<Value, Obj>,
  callback?: ResultCallback
): this { ... }

Parameters:

Name: `type`	Description
`descriptor: ThisAccessorDescriptor<Value, Obj>`	An `object` of a `ThisAccessorDescriptor<Value, Obj>` interface, to set with the last saved descriptor values
`callback?: ResultCallback`	An optional `ResultCallback` function to handle the result of the check whether or not the `descriptor` is an `object` containing the `get` or `set` property, by default it uses `accessorCallback()` from the static `guard()` method

Throws:

Throws an Error if the descriptor is not an object of a ThisAccessorDescriptor<Value, Obj> type, which means doesn't contain get or set property.

Returns:

The return value is the AccessorDescriptors instance for the chaining.

Usage:

// Example usage.
import { AccessorDescriptors } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = '';
}

class People {
  firstName!: string;
}

const person: Person = new Person();
const people: People = new People();

const firstNameDescriptor = new AccessorDescriptors<string, Person>().set({
  configurable: false,
  enumerable: false,
  get(): string {
    return people.firstName;
  },
  set(value: string): void {
    people.firstName = value;
  },
});

AccessorDescriptors instance properties

`AccessorDescriptors.prototype.get`

Description:

Get privately stored accessor descriptor of a ThisAccessorDescriptor<Value, Obj> type defined by the set() method.

Syntax:

get get(): ThisAccessorDescriptor<Value, Obj> { ... }

Usage:

// Example usage.
import { AccessorDescriptors } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = '';
}

class People {
  firstName!: string;
}

const person: Person = new Person();
const people: People = new People();

const firstNameDescriptor = new AccessorDescriptors<string, Person>().set({
  configurable: false,
  enumerable: false,
  get(): string {
    return people.firstName;
  },
  set(value: string): void {
    people.firstName = value;
  },
});

// Define the property `firstName` in the `person` object to link with the same property in the `people` object.
// Changes to the property `firstName` in the `person` object affect the property `firstName` in the `people` object.
Object.defineProperty(person, 'firstName', firstNameDescriptor.get);

DataDescriptors

Description:

Strictly defines, sets, and stores privately property data descriptor of a DataDescriptor<Value> interface.

Strictly means, data descriptor of a DataDescriptor<Value> is type guarded and methods picks configurable, enumerable, writable, value properties from the provided descriptor object.

Features:

Data descriptor is of a DataDescriptor<Value> interface:
- The value property is of a generic Value type.
Guarded process of defining the object descriptor, but properties are not being checked against proper values.
Strictly defines property data descriptor.
Strictly sets, and stores at the same time property data descriptor.
Method set() of the instance and static [define()][datadescriptors-define] picks configurable, enumerable, writable, value properties from the provided data.
Get privately stored data descriptor defined by the set() method of the instance.

Import:

import { DataDescriptors } from '@angular-package/property';

Syntax:

DataDescriptors<Value> { ... }

DataDescriptors static methods

`DataDescriptors.define()`

Description:

Returns strictly defined data descriptor of a DataDescriptor<Value> interface, on writable or value property detected.

Syntax:

static define<Value>(
  descriptor: DataDescriptor<Value>,
  callback?: ResultCallback
): DataDescriptor<Value> { ... }

Generic type variables:

Name	Description
`Value`	Guards the `value` property from the `descriptor` object, and the return type of a `DataDescriptor<Value>` interface

Parameters:

Name: `type`	Description
descriptor: `DataDescriptor<Value>`	An `object` of a `DataDescriptor<Value>` interface, to set with the default values of the `CommonDescriptor`
callback?: `ResultCallback`	An optional `ResultCallback` function to handle the result of the check whether or not the `descriptor` is an `object` with `writable` or `value` property, by default it uses `dataCallback()` function from the static `guard()` method

Throws:

Throws an Error if the descriptor is not an object of a DataDescriptor<Value> interface, which means it doesn't contain writable or value property.

Returns:

The return value is an object of a DataDescriptor<Value> interface.

Usage:

// Example usage.
import { DataDescriptors } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = '';
}

class People {
  firstName!: string;
}

const person: Person = new Person();
const people: People = new People();

const firstNameDescriptor = DataDescriptor.define<string, Person>({
  get(): string {
    return people.firstName;
  },
  set(value: string): void {
    people.firstName = value;
  },
});

// Define the property `firstName` in the `person` object to link with the same property in the `people` object.
// Changes to the property `firstName` in the `person` object affect the property `firstName` in the `people` object.
Object.defineProperty(person, 'firstName', firstNameDescriptor);

DataDescriptors Constructor

`DataDescriptors()`

Description:

Creates an instance, and optionally sets a data descriptor of a DataDescriptor<Value> interface.

Syntax:

DataDescriptors<Value>(descriptor?: DataDescriptor<Value>)

Generic type variables:

Name	Description
`Value`	Guards the `value` property from the `descriptor` object

Parameters:

Name: `type`	Description
`descriptor?: DataDescriptor<Value>`	An optional `object` of a `DataDescriptor<Value>` interface to initially set data descriptor

Usage:

// Example usage.
import { DataDescriptors } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = '';
}

class People {
  firstName!: string;
}

const person: Person = new Person();
const people: People = new People();

const firstNameDescriptor = new DataDescriptors<string>({ // Initialize
  writable: false,
  value: 'not writable'
});

DataDescriptors instance methods

`DataDescriptors.prototype.set()`

Description:

Strictly sets with the last saved descriptor values, and stores privately data descriptor of a DataDescriptor<Value> interface.

Syntax:

set(
  descriptor: DataDescriptor<Value>,
  callback?: ResultCallback
): this { ... }

Generic type variables:

Name	Description
`Value`	Guards the `value` property from the `descriptor` object

Parameters:

Name: `type`	Description
`descriptor: DataDescriptor<Value>`	An `object` of a `DataDescriptor<Value>` interface, to set with the last saved descriptor
`callback?: ResultCallback`	An optional `ResultCallback` function to handle the result of the check whether or not the `descriptor` is an `object` containing the `writable` or `value` property, by default it uses `dataCallback()` function from the static `guard()` method

Throws:

Throws an Error if the descriptor is not an object of a DataDescriptor<Value> type, which means doesn't contain writable or value property.

Returns:

The return value is the DataDescriptors instance for the chaining.

Usage:

// Example usage.
import { DataDescriptors } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = '';
}

class People {
  firstName!: string;
}

const person: Person = new Person();
const people: People = new People();

const firstNameDescriptor = new DataDescriptors<string>()
.set({
  configurable: false,
  enumerable: false,
  writable: false,
  value: people.firstName
});

// Defines the property `firstName` in the `person` object with the same value as the property in the `people` object.
Object.defineProperty(person, 'firstName', firstNameDescriptor.get);

DataDescriptors instance properties

`DataDescriptors.prototype.get`

Description:

Get privately stored data descriptor of a DataDescriptor<Value> interface defined by the instance set() method.

Syntax:

get get(): DataDescriptor<Value> { ... }

Usage:

// Example usage.
import { DataDescriptors } from '@angular-package/property';

interface PersonShape {
  firstName: string;
}

class Person implements PersonShape {
  firstName = '';
}

class People {
  firstName!: string;
}

const person: Person = new Person();
const people: People = new People();

const firstNameDescriptor = new DataDescriptors<string>()
.set({
  configurable: false,
  enumerable: false,
  writable: false,
  value: people.firstName
})
// After set, get the value.
.get;

// Defines the property `firstName` in the `person` object with the same value as the property in the `people` object.
Object.defineProperty(person, 'firstName', firstNameDescriptor);

Descriptor interface

AccessorDescriptor

Description:

Descriptor with its unique optional get() and set() functions, of the Value type. For the accessor descriptor with also the object type, please use the type ThisAccessorDescriptor<Value, Obj>. More about property descriptors here.

interface AccessorDescriptor<Value> extends CommonDescriptor {
  get?: () => Value;
  set?: (value: Value) => void;
}

CommonDescriptor

Description:

Common keys configurable and enumerable of a boolean type for accessor and data descriptor, picked from the default PropertyDescriptor. More about property descriptors here.

Syntax:

interface CommonDescriptor
  extends Pick<PropertyDescriptor, 'configurable' | 'enumerable'> {}

DataDescriptor

Description:

Descriptor with its unique optional keys, writable of a boolean type and value of a generic Value type. More about property descriptors here.

Syntax:

interface DataDescriptor<Value> extends CommonDescriptor {
  writable?: boolean;
  value?: Value;
}

Descriptor type

ThisAccessorDescriptor

Description:

AccessorDescriptor interface as a type cause of ease of use this of an Obj type in the get() and set() functions. More about property descriptors here.

Syntax:

type ThisAccessorDescriptor<Value, Obj> = AccessorDescriptor<Value> &
  ThisType<Obj>;

GIT

Commit

Versioning

Semantic Versioning 2.0.0

Given a version number MAJOR.MINOR.PATCH, increment the:

MAJOR version when you make incompatible API changes,
MINOR version when you add functionality in a backwards-compatible manner, and
PATCH version when you make backwards-compatible bug fixes.

Additional labels for pre-release and build metadata are available as extensions to the MAJOR.MINOR.PATCH format.

FAQ How should I deal with revisions in the 0.y.z initial development phase?

The simplest thing to do is start your initial development release at 0.1.0 and then increment the minor version for each subsequent release.

How do I know when to release 1.0.0?

If your software is being used in production, it should probably already be 1.0.0. If you have a stable API on which users have come to depend, you should be 1.0.0. If you’re worrying a lot about backwards compatibility, you should probably already be 1.0.0.

@angular-package/property

Packages

angular-package/property

How angular-package understands

Installation

Callback

Object

get

Function

getDescriptor()

getDescriptors()

getExistProperty()

getProperties()

getProperty()

setProperty()

Descriptor sub package

Descriptor

Descriptor static methods

Descriptor.defineAccessor()

Descriptor.defineData()

Descriptor.fromObject()

Descriptor.fromProperty()

AccessorDescriptors

AccessorDescriptors callback

accessorCallback()

AccessorDescriptors static methods

AccessorDescriptors.define()

AccessorDescriptors Constructor

AccessorDescriptors()

AccessorDescriptors instance methods

AccessorDescriptors.prototype.set()

AccessorDescriptors instance properties

AccessorDescriptors.prototype.get

DataDescriptors

DataDescriptors static methods

DataDescriptors.define()

DataDescriptors Constructor

DataDescriptors()

DataDescriptors instance methods

DataDescriptors.prototype.set()

DataDescriptors instance properties

DataDescriptors.prototype.get

Descriptor interface

AccessorDescriptor

CommonDescriptor

DataDescriptor

Descriptor type

ThisAccessorDescriptor

GIT

Commit

Versioning

License

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`get`

`getDescriptor()`

`getDescriptors()`

`getExistProperty()`

`getProperties()`

`getProperty()`

`setProperty()`

`Descriptor.defineAccessor()`

`Descriptor.defineData()`

`Descriptor.fromObject()`

`Descriptor.fromProperty()`

`accessorCallback()`

`AccessorDescriptors.define()`

`AccessorDescriptors()`

`AccessorDescriptors.prototype.set()`

`AccessorDescriptors.prototype.get`

`DataDescriptors.define()`

`DataDescriptors()`

`DataDescriptors.prototype.set()`

`DataDescriptors.prototype.get`

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