deep-omit-ts
v1.2.1
Published
Utility type for omitting nested properties from an object
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DeepOmit<Type, Keys>
Utility type for omitting nested properties from a type. Fully type-safe, has nice autocompletion, and works with arrays.
📦 Installation
NPM
npm install --save-dev deep-omit-ts
Yarn
yarn add --dev deep-omit-ts
⏱️ Quick Start
import { DeepOmit } from 'deep-omit-ts';
type Example = {
a: string;
b: {
c: string;
d: {
e: string;
f: string;
};
};
};
type Omitted = DeepOmit<Example, 'a' | 'b.d.e'>;
📖 Documentation
Basic Usage
DeepOmit<Type, Keys>
is a utility type that takes two generic parameters:
Type
- The type to omit properties fromKeys
- Keys of the properties to omit
DeepOmit
can be used like the built-in Omit
utility type:
type Todo = {
title: string;
description: string;
completed: boolean;
createdAt: number;
}
type TodoPreview = DeepOmit<Todo, "description">;
const todo: TodoPreview = {
title: "Clean room",
completed: false,
createdAt: 1615544252770,
};
A union of keys can be used to omit multiple properties:
type TodoInfo = Omit<Todo, "completed" | "createdAt">;
const todoInfo: TodoInfo = {
title: "Pick up kids",
description: "Kindergarten closes at 5pm",
};
Nested Properties
Unlike Omit
, DeepOmit
can omit nested properties:
import { DeepOmit } from 'deep-omit-ts';
type Example = {
foo1: string;
foo2: {
bar1: string;
bar2: {
baz1: string;
baz2: string;
};
};
};
type Omitted = DeepOmit<Example, 'foo2.bar1' | 'foo2.bar2.baz1'>;
const omitted: Omitted = {
foo1: 'foo1',
foo2: {
bar2: {
baz2: 'baz2',
},
},
};
When writing the keys you'll see that the autocompletion works as expected:
Arrays
DeepOmit
works with arrays as well:
type Example = Array<{
foo1: string;
foo2: Array<{
bar1: string;
bar2: string;
}>;
}>;
type Omitted = DeepOmit<Example, 'foo2.bar2'>
const omitted: Omitted = [
{
foo1: 'foo1',
foo2: [
{
bar1: 'bar1',
}
]
}
];
Ignored Types
An optional third generic parameter can be applied to DeepOmit
to ignore the properties of certain types. This is especially helpful if your type contains large classes (like most of JavaScript's built-ins) where you don't want their keys to show up in the autocompletion. It can also help with the type-checker's performance on very large types.
class SomeLargeClass {
// Imagine a lot of properties and methods here
}
type Example = {
foo: string;
bar: SomeLargeClass;
};
type Omitted = DeepOmit<Example, 'bar', SomeLargeClass>;
DeepOmit
will automatically ignore checking the props of the following types:
Function
Number
String
Map<any, any>
Promise<any>
Date
RegExp