What is a type declaration file?

1.	What is a type declaration file?
Answer» A typical TypeScript project references other third-party TypeScript libraries such as JQUERY to perform routine TASKS. Having type information for the library code helps you in coding by providing detailed information about the types, method signatures, etc., and provides IntelliSense. A type declaration file is a text file ENDING with a .d.ts EXTENSION providing a way to declare the existence of some types or values without actually providing IMPLEMENTATIONS for those values. It contains the type declarations but doesn’t have any source code. It doesn’t produce a .js file after compilation.

Answer»

A typical TypeScript project references other third-party TypeScript libraries such as JQUERY to perform routine TASKS. Having type information for the library code helps you in coding by providing detailed information about the types, method signatures, etc., and provides IntelliSense.

A type declaration file is a text file ENDING with a .d.ts EXTENSION providing a way to declare the existence of some types or values without actually providing IMPLEMENTATIONS for those values. It contains the type declarations but doesn’t have any source code. It doesn’t produce a .js file after compilation.

Discussion

No Comment Found

Related InterviewSolutions

List some of the utility types provided by TypeScript and explain their usage.
What is the Function type in TypeScript?
What are conditional types? How do you create them?
Explain the concept of inheritance in TypeScript.
What are template literal types?
What are string literal types?
What are the ‘implements’ clauses in TypeScript?
Explain the purpose of the ‘in’ operator.
What are triple-slash directives?
What is a type declaration file?