How To Set A Type To Be A String But Not Allowing Some Specific Values
You can t exclude specific string literals from the string type It would be cool but you can t edit at least not yet thanks as always jcalz Instead you could define your Contact type like this type SpecificContact Customer Supplier type Contact SpecificContact BasicContact
Allow Only Specific String Values With TypeScript Type, Use a string literal type to only allow specific string values in a TypeScript type e g const str draft sent draft String literals allow us to refer to specific strings in type positions If the specified string is not in the literal type an error is thrown Here are two more examples
Typescript Array Of Specific String Values Stack Overflow
3 Answers Sorted by 31 You basically have two options here const string enum https www typescriptlang docs handbook enums html string enums for having the string values present for checks at runtime
TypeScript Documentation Template Literal Types, Intrinsic String Manipulation Types To help with string manipulation TypeScript includes a set of types which can be used in string manipulation These types come built in to the compiler for performance and can t be found in the d ts files included with TypeScript Uppercase lt StringType gt Converts each character in the string to the
Typescript Get Array Of String Literal Type Values Stack Overflow
Typescript Get Array Of String Literal Type Values Stack Overflow, If you need to have string values for YesNo type you can use a trick since string values of enums aren t part of TS yet const YesNoEnum Yes Yes No No function thatAcceptsYesNoValue vale keyof typeof YesNoEnum void Then you can use getEnumValues YesNoEnum to get possible values for YesNoEnum i e Yes No
TypeScript Sheet 32 Code Examples PDF Poster
TypeScript Documentation Everyday Types
TypeScript Documentation Everyday Types As you might expect these are the same names you d see if you used the JavaScript typeof operator on a value of those types string represents string values like quot Hello world quot number is for numbers like 42 JavaScript does not have a special runtime value for integers so there s no equivalent
What Is String Type Data Type In JavaScript 7 You Should Know About
There isn t a general solution to this problem since there is no way to express in the typescript type system the fact that a string can be any value except a list One might think the conditional type Exclude lt string ReservedNames gt would work but it does not it just evaluates back to string Typescript Type For quot every Possible String Value Except quot . A common idiom in JavaScript to differentiate between two possible values is to check for the presence of a member As we mentioned you can only access members that are guaranteed to be in all the constituents of a union type let pet getSmallPet if quot swim quot in pet pet swim if pet fly The goal is for the return type to be name string age number or name string amp age number Is there a way to use the variable attrName to add a specific key name and value type to PartialRecord but I d like to avoid the redundancy of writing the key name in the generic and the method and defining the value type in the
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