I am endeavoring to implement the validate.js library, which comes with its own TypeScript declaration file.
However, the provided typing for the library is not very accurate, and there is a more superior one available in DefinitelyTyped. Despite installing the @types/validate.js NPM package, TypeScript continues to use the bundled declarations from the library itself.
Is there a method to have the compiler utilize the superior declarations that are at my disposal?
When it comes to using declarations for validate.js from DefinitelyTyped, it's essential to note that relying solely on them is not sufficient. This is because there is no single top-level export in the declarations - they simply declare some interfaces within the ValidateJS namespace.
Furthermore, if you are working with bundled declarations for validate.js, especially in a node environment (module=commonjs), you will encounter issues due to the use of default exports instead of export =.
As a solution, it becomes necessary to create your own declarations to correctly import validate.js:
Create a file called validate.d.ts:
declare var validate: (attributes: any, constraints: any, options?: any) => any;
export = validate;
Instruct TypeScript to use this custom declaration file instead of the one in the node_modules directory by utilizing paths in your tsconfig.json file:
"compilerOptions": {
"baseUrl": ".", // Ensure to specify this if using "paths".
"paths": {
"validate.js": ["./validate.d.ts"]
}
}
(Note: If you are employing paths, it is mandatory to have baseUrl set. If it's not already set, define it as "baseUrl" : ".")
Subsequently, you can use the imported declaration like this (note that ValidateJS.Constraints and others become available once you npm install @types/validate.js):
import validate = require('validate.js');
let constraints: ValidateJS.Constraints = {
'foo': {presence: true}
};
let e = validate({}, constraints);
console.dir(e);
Result:
{ foo: [ 'Foo can\'t be blank' ] }
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