ts-essentials
Advanced tools
All essential TypeScript types in one place 🤙
npm install --save-dev ts-essentials
👉 We require typescript>=4.5. If you're looking for support for older TS versions, please have a look at the
TypeScript dependency table
👉 As we really want types to be stricter, we require enabled strictNullChecks in your project
ts-essentials is a set of high-quality, useful TypeScript types that make writing type-safe code easier.
Builtin - Matches primitive, function, date, error or regular expressionKeyofBase -
keyofStringsOnly-tolerant analogue for PropertyKeyPrettify<Type> - flattens type and makes it more readable on the hover in your IDEPrimitive - Matches any
primitive valueStrictExclude<UnionType, ExcludedMembers> - Constructs a type by excluding from UnionType
all union members that are assignable to ExcludedMembers. This is stricter version of
ExcludeStrictExtract<Type, Union> - Constructs a type by extracting from Type all union members
that are assignable to Union. This is stricter version of
ExtractStrictOmit<Type, Keys> - Constructs a type by picking all properties from Type and then
removing Keys. This is stricter version of
OmitWritable<Type> - Constructs a type with removed readonly for all properties of Type, meaning
the properties of the constructed type can be reassignedAsyncOrSync<Type> - Constructs a type with Type or PromiseLike<Type>AsyncOrSyncType<Type> - Unwraps AsyncOrSync typeDictionary<Type, Keys?> - Constructs a required object type which property keys are Keys
(string by default) and which property values are TypeMerge<Object1, Object2> - Constructs a type by picking all properties from Object1 and Object2.
Property values from Object2 override property values from Object1 when property keys are the sameMergeN<Tuple> - Constructs a type by merging objects with type Merge in tuple Tuple recursivelyNewable<ReturnType> - Constructs a class type with constructor which has return type ReturnTypeNonNever<Type> - Constructs a type by picking all properties from type Type which values don't
equal to neverOmitProperties<Type, Value> - Constructs a type by picking all properties from type Type
and removing those properties which values equal to ValueOpaque<Type, Token> - Constructs a type which is a subset of Type with a specified unique token
TokenPathValue<Type, Path> - Constructs a path value for type Type and path PathPaths<Type> - Constructs a union type by picking all possible paths for type TypePickProperties<Type, Value> - Constructs a type by picking all properties from type Type
which values equal to ValueSafeDictionary<Type, Keys?> - Constructs an optional object type which property keys are
Keys (string by default) and which property values are TypeUnionToIntersection<Union> - Constructs a intersection type from union type UnionValueOf<Type> - Constructs a type for type Type and equals to a primitive for primitives, array
elements for arrays, function return type for functions or object property values for objectsXOR<Type1, Type2, Type3?, ..., Type50?> - Construct a type which is assignable to either type Type1,
Type2 but not both. Starting in ts-essentials@10, it supports up to 50 generic types.MarkOptional<Type, Keys> - Constructs a type by picking all properties from type Type where
properties Keys are set as optional, meaning they aren't requiredMarkReadonly<Type, Keys> - Constructs a type by picking all properties from type Type where
properties Keys are set to readonly, meaning they cannot be reassignedMarkRequired<Type, Keys> - Constructs a type by picking all properties from type Type where
properties Keys are set as requiredMarkWritable<Type, Keys> - Constructs a type by picking all properties from type Type where
properties Keys remove readonly modifier, meaning they can be reassignedBuildable<Type> - Constructs a type by combining DeepPartial and DeepWritable, meaning all
properties from type Type are recursively set as non-readonly and optional, meaning they can be reassigned and
aren't requiredDeepMarkOptional<Type, KeyPathUnion> - Constructs a type by picking all properties from type Type where
properties by paths KeyPathUnion are set as optional. To mark properties optional on one level, use MarkOptional<Type, Keys>.DeepMarkRequired<Type, KeyPathUnion> - Constructs a type by picking all properties from type Type where
properties by paths KeyPathUnion are set as required. To mark properties required on one level, use MarkRequired<Type, Keys>.DeepNonNullable<Type> - Constructs a type by picking all properties from type Type
recursively and exclude null and undefined property values from all of them. To make properties non-nullable on
one level, use NonNullable<Type>DeepNullable<Type> - Constructs a type by picking all properties from type Type recursively
and include null property values for all of themDeepOmit<Type, Filter> - Constructs a type by picking all properties from type Type and removing
properties which values are never or true in type Filter. If you'd like type Filter to be validated against a
structure of Type, please use StrictDeepOmit<Type, Filter>.DeepPartial<Type> - Constructs a type by picking all properties from type Type recursively
and setting them as optional, meaning they aren't required. To make properties optional on one level, use
Partial<Type>DeepPick<Type, Filter> - Constructs a type by picking set of properties, which have property
values never or true in type Filter, from type Type. If you'd like type Filter to be validated against a
structure of Type, please use StrictDeepPick<Type, Filter>.DeepReadonly<Type> - Constructs a type by picking all properties from type Type recursively
and setting readonly modifier, meaning they cannot be reassigned. To make properties readonly on one level, use
Readonly<Type>DeepRequired<Type> - Constructs a type by picking all properties from type Type recursively
and setting as required. To make properties required on one level, use
Required<Type>DeepUndefinable<Type> - Constructs a type by picking all properties from type Type
recursively and include undefined property values for all of themDeepWritable<Type> - Constructs a type by picking all properties from type Type recursively
and removing readonly modifier, meaning they can be reassigned. To make properties writable on one level, use
Writable<Type>StrictDeepOmit<Type, Filter> - Constructs a type by picking all properties from type Type
and removing properties which values are never or true in type Filter. The type Filter is validated against a
structure of Type.StrictDeepPick<Type, Filter> - Constructs a type by picking set of properties, which have
property values never or true in type Filter, from type Type. The type Filter is validated against a
structure of Type.OptionalKeys<Type> - Constructs a union type by picking all optional properties of object type
TypePickKeys<Type, Value> - Constructs a union type by picking all properties of object type Type
which values are assignable to type ValueReadonlyKeys<Type> - Constructs a union type by picking all readonly properties of object
type Type, meaning their values cannot be reassignedRequiredKeys<Type> - Constructs a union type by picking all required properties of object type
TypeWritableKeys<Type> - Constructs a union type by picking all writable properties of object type
Type, meaning their values can be reassignedExact<Type, Shape> - Returns Type when type Type and Shape are identical. Otherwise returns
neverIsAny<Type> - Returns true when type Type is any. Otherwise returns falseIsNever<Type> - Returns true when type Type is never. Otherwise returns falseIsUnknown<Type> - Returns true when type Type is unknown. Otherwise returns falseIsTuple<Type> - Returns Type when type Type is tuple. Otherwise returns neverNonEmptyObject<Object> - Returns Object when Object has at least one key. Otherwise
returns neverAnyArray<Type?> - Matches Array or ReadonlyArray (Type is any by default)ArrayOrSingle<Type> - Matches Type or Type[]ElementOf<Type> - Constructs a type which equals to array element type for type TypeHead<Type> - Constructs a type which equals to first element in type TypeNonEmptyArray<Type> - Matches array with at least one element of type TypeReadonlyArrayOrSingle - Matches Type or readonly Type[]Tail<Type> - Constructs a type which equals to elements but first one in type TypeTuple<Type?> - Matches type constraint for tuple with elements of type Type (any by default)CamelCase<Type> - Converts type Type to camel case (e.g. camelCase)DeepCamelCaseProperties<Type> - Constructs a type by picking all properties from
type Type recursively and converting all of them to camel caseAnyFunction<Args?, ReturnType?> - Matches function type with arguments type Args (any[] by
default) and return type ReturnType (any by default)PredicateFunction - Matches type constraint for type guard, meaning first argument is
used in return type and return type is
type predicatePredicateType<Type> - Constructs a type which equals to narrowed type in predicate function
Type⚠️ Make sure you add ts-essentials to your dependencies (npm install --save ts-essentials) to avoid runtime errors
new UnreachableCaseError(value) - Matches runtime class instance type that
helps check exhaustiveness for value. When value isn't never, it shows TypeScript errorassert(condition, message?) - Matches runtime function that helps assert condition. When
condition is falsy, it throws an error with Assertion Error: ${message} (message is
"no additional info provided" by default)createFactoryWithConstraint<Constraint>()(value) - Matches runtime
function, which validates that type of value matches Constraint without changing resulting type of value.
Ponyfill for
satisfies operatorisExact<Expected>()(actual) - Matches runtime function, which validates that type of
actual equals to Expected. Otherwise shows TypeScript errornoop(..._args) - Matches runtime function that does nothing with arguments _argsWhen one of utility types is known by a different name, kindly ask adding it here for the better search.
ArrayValues - ValueOf<Type>Branded - Opaque<Type, Token>ConditionalKeys - PickKeys<Type, Value>Except - StrictOmit<Type, Keys>Get - PathValue<Type, Path>Mutable - Writable<Type>Nominal - Opaque<Type, Token>Set*, e.g. SetOptional - Mark*, e.g. MarkReadonly<Type, Keys>Unwrap - Prettify<Type>ValueOf - DictionaryValuesTypeScript provides several utility types to facilitate common type transformations. These utilities are available globally.
Awaited<Type> - This type is meant to
model operations like await in async functions, or the .then() method on Promises - specifically, the way that
they recursively unwrap PromisesCapitalize<StringType> -
Converts the first character in the string to an uppercase equivalentConstructParameters<Type> -
Constructs a tuple or array type from the types of a constructor function type TypeExclude<UnionType, ExcludedMembers> -
Constructs a type by excluding from UnionType all union members that are assignable to ExcludedMembersExtract<Type, Union> -
Constructs a type by extracting from Type all union members that are assignable to UnionInstanceType<Type> - Constructs
a type consisting of the instance type of a constructor function in TypeLowercase<StringType> -
Converts each character in the string to the lowercase equivalentNonNullable<Type> - Constructs a
type by excluding null and undefined from TypeOmit<Type, Keys> - Constructs a
type by picking all properties from Type and then removing KeysParameters<Type> - Constructs a
tuple type from the types used in the parameters of a function type TypePartial<Type> - Constructs a type
with all properties of Type set to optionalPick<Type, Keys> - Constructs a
type by picking the set of properties Keys from TypeReadonly<Type> - Constructs a type
with all properties of Type set to readonly, meaning the properties of the constructed type cannot be reassignedRecord<Keys, Type> - Constructs
an object type whose property keys are Keys and whose property values are TypeRequired<Type> - Constructs a type
consisting of all properties of Type set to requiredReturnType<Type> - Constructs a
type consisting of the return type of function type Type parameterUncapitalize<StringType> -
Converts the first character in the string to a lowercase equivalentUppercase<StringType> -
Converts each character in the string to the uppercase versionts-essentials | typescript / type of dependency |
|---|---|
^10.0.0 | ^4.5.0 / peer optional |
^9.4.0 | ^4.1.0 / peer optional |
^8.0.0 | ^4.1.0 / peer |
^5.0.0 | ^3.7.0 / peer |
^3.0.1 | ^3.5.0 / peer |
^1.0.1 | ^3.2.2 / dev |
^1.0.0 | ^3.0.3 / dev |
extends Constraints on infer Type Variables as it's introduced in TypeScript 4.7, but currently ts-essentials supports versions below, e.g. TypeScript 4.5. Read more in https://www.typescriptlang.org/docs/handbook/release-notes/typescript-4-7.html#extends-constraints-on-infer-type-variablesSpecial shout-out to active contributors:
And thanks goes to these wonderful people:
💻 - contributions, i.e. links to commits by the user on this project
Contributions of any kind welcome! Read more
10.1.1
DeepReadonly<Type> & DeepRequired<Type> types when Type is an array containing rest element, like
[string, ...number[]]Provides a collection of utility types for TypeScript, similar to ts-essentials. It includes types for operations like picking, omitting, and mapping properties of object types.
A comprehensive library of utility types for TypeScript, with a wide range of type helpers. It covers more ground than ts-essentials and is regularly updated with new types.
Focused on Redux action creators, typesafe-actions provides utility types and functions for creating and handling actions in a type-safe manner, which is a more specific use case compared to the general utilities provided by ts-essentials.
FAQs
All essential TypeScript types in one place
The npm package ts-essentials receives a total of 0 weekly downloads. As such, ts-essentials popularity was classified as not popular.
We found that ts-essentials demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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