TypedRecord

A type-safe record with 0 dependencies.
Aren't you sick of creating a Record or Map without strictly knowing the type of the values?

For example:

let record!: Record<string, number | string | undefined>;

const iWouldLikeToBeOfTypeNumber = record.thisIsANumber // The type would be "string | number | undefined" unfortunately...

So you can chill out and just use TypedRecord instead.

import { TypedRecord } from 'typed-record';

const typedRecord = new TypedRecord();
const myKey = typedRecord.set('aNameForTheKey', 5);

const aNumber = typedRecord.get(myKey) // The type is "number"!!!

Simple as that.

Installation

npm i typed-record

or

yarn add typed-record

Usage

set

Set a typed value in the record

@param key - A string that represent the symbol name or the key (Symbol) that holds the type of the value

@param value - the value to set

@returns returns the key that is used to retrieve the value

const typedRecord = new TypedRecord();
// The key is created for you automatically
const myKey = typedRecord.set('my-key', { hello: 'world' });

// Manually creating the key
const manuallyCreatedKey = TypedRecord.key<number>('a-key');
typedRecord.set(manuallyCreatedKey, 69);

get

The get method returns the value associated with the specified key

@param key - the key (Symbol) that holds the type of the value

@returns the typed value or undefined if it doesn't exist

const typedRecord = new TypedRecord();
const myKey = typedRecord.set('my-key', { hello: 'world' });

const value = typedRecord.get(myKey); // The type would be "{ hello: 'world' }"

has

The has method returns a boolean indicating whether an element with the specified key exists or not.

@param key - the key (Symbol) that holds the type of the value

@returns returns true if the record contains the specified key

const typedRecord = new TypedRecord();

const myKey = typedRecord.set('my-key', { hello: 'world' });

typedRecord.has(myKey); // true
typedRecord.has(TypedRecord.key('does-not-exist-key')); // false

delete

The delete method removes the specified element from the TypedRecord by key.

@param key - the key (Symbol) that holds the type of the value

@returns returns true if the record contained the specified element

const typedRecord = new TypedRecord();

const myKey = typedRecord.set('my-key', { hello: 'world' });

typedRecord.delete(myKey); // true
typedRecord.delete(TypedRecord.key('does-not-exist-key')); // false

clear

The clear method removes all elements from a record object.

Creating a key Manually

To get your typed value from the record you need to create a key (Symbol) that holds the type of the value.

@param name - description of the key

@returns return a typed symbol that can be used to access the value

const key = TypedRecord.key<{ hello: 'world' }>('test');

License

MIT

Contributing

Feel free to fork and create pull requests!