Error TS4081: Exported type alias ‘TemplateLiteralType’ has or is using private name ”
If you are working with TypeScript and have encountered the error message “TS4081: Exported type alias ‘TemplateLiteralType’ has or is using private name ””, you are not alone. This error occurs when you are trying to export a type alias that references a private name or a name that is not accessible outside of its module.
There are a few possible solutions to this problem, depending on the specific scenario you are facing. Let’s explore each solution in detail:
Solution 1: Make the referenced name public
If the referenced name is a private name within the module, you can make it public by removing the private modifier. This will allow the type alias to access the name and resolve the error. Here’s an example:
// Before
private type PrivateName = 'private';
// After
type PublicName = 'public';
export type TemplateLiteralType = `Hello, ${PublicName}!`;
Solution 2: Import the private name from another module
If the referenced name is defined in another module and is not accessible directly, you can import it and use it in your type alias. This will ensure that the name is accessible and the error is resolved. Here’s an example:
// In another module
export type PrivateName = 'private';
// In your module
import { PrivateName } from './otherModule';
export type TemplateLiteralType = `Hello, ${PrivateName}!`;
Solution 3: Use a different name that is accessible
If the referenced name is not accessible or cannot be made public, you can use a different name that is accessible within your module. This will allow the type alias to resolve the error without relying on the inaccessible name. Here’s an example:
// Before
type InaccessibleName = 'inaccessible';
export type TemplateLiteralType = `Hello, ${InaccessibleName}!`;
// After
type AccessibleName = 'accessible';
export type TemplateLiteralType = `Hello, ${AccessibleName}!`;
By following one of these solutions, you should be able to resolve the error TS4081 and successfully export your type alias without any issues.
Error TS1110: Type expected
If you are encountering the error message “TS1110: Type expected”, it means that TypeScript was expecting a type declaration but found something else instead. This error usually occurs when you have a syntax error or a misplaced token in your code.
To resolve this error, you need to carefully review your code and ensure that you have provided the correct type declaration at the expected location. Here are a few common scenarios that can trigger this error:
Scenario 1: Missing type annotation
If you have omitted a required type annotation, TypeScript will throw the TS1110 error. Make sure to provide the appropriate type annotation for variables, function parameters, or return types. Here’s an example:
// Before
function greet(name) {
return `Hello, ${name}!`;
}
// After
function greet(name: string): string {
return `Hello, ${name}!`;
}
Scenario 2: Incorrect type declaration
If you have provided an incorrect type declaration, TypeScript will also throw the TS1110 error. Double-check your type declarations and ensure they match the expected types. Here’s an example:
// Before
function add(a: number, b: number): string {
return a + b;
}
// After
function add(a: number, b: number): number {
return a + b;
}
Scenario 3: Misplaced token
If you have a misplaced token in your code, TypeScript may interpret it as an incorrect type declaration and trigger the TS1110 error. Review your code for any misplaced tokens and correct them accordingly. Here’s an example:
// Before
function multiply(a: number, b: number: number {
return a * b;
}
// After
function multiply(a: number, b: number): number {
return a * b;
}
By carefully reviewing your code and addressing the specific scenario causing the TS1110 error, you should be able to resolve it and ensure that TypeScript expects the correct type declarations.
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