Use Partial to Create Partially Fillable Types in TypeScript

Make your optional fields required in TypeScript

Create a Type with Some Fields of Another Type in TypeScript with Pick

Exclude Properties from a Type in TypeScript

Create Immutable Types in TypeScript

Ignore Null or Undefined Values with TypeScript Non-Null Assertion Operator

Create Type From Any Given Data in TypeScript

Create Dynamically Typed Strings Using Template Literal Types

Create Class Properties using Constructor Assignment

Avoid errors using unknown type

Create mapped types using Record type

Reduce duplicate types with Generic Types

Merge Types using Intersection Operator

Verify if some literal value satisfies a given type

TypeScript: Tips and Tricks

In our [last lesson](https://egghead.io/lessons/javascript-use-partial-to-create-partially-fillable-types-in-typescript), we saw how we can make all the required fields in a type to be optional. Here we learn the opposite i.e. how to make all the optional fields to be required with the help of `Required`.

https://app.egghead.io/api/v1/lessons/javascript-make-your-optional-fields-required-in-typescript/subtitles

Instructor: [00:00] As you can see here, we don't have age and gender in our user object. It is not throwing any errors because both of the fields are optional in our type.

[00:08] With the help of required, we can make all our option fields to be required. Now, if I put required here in our user type, it would make the age and gender to be required also. It will throw the error that age and gender are required.

[00:19] Now, if I put the age here and gender here, the error will go away.

Make your optional fields required in TypeScript

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TypeScript: Tips and Tricks