I have a Cypress command with a parameter that I want to restrict so it only accepts certain values. For example, I want the columnValue to be limited to 'xxx', 'yyy', or 'zzz'. How can I achieve this?
Cypress.Commands.add('addColumnAsDimension', (columnName: string) => {
chartMenu.addColumnButton.click();
chartMenu.columnNameButton(columnName).click();
chartMenu.addAsDimensionButton.click();
});If you are looking to specify multiple options for a variable, you can use a union type in TypeScript:
type Column = 'xxx' | 'yyy' | 'zzz'
Cypress.Commands.add('addColumnAsDimension', (columnName: Column) => {
chartMenu.addColumnButton.click();
chartMenu.columnNameButton(columnName).click();
chartMenu.addAsDimensionButton.click();
});
To ensure that the Cypress compiler checks your custom method invocation correctly, you need to provide a type definition for the method as well:
declare namespace Cypress {
interface Chainable<Subject> {
addColumnAsDimension(columnName: Column): void
}
}
By adding this type definition, the compiler will now validate your arguments when using the custom Cypress method: https://i.sstatic.net/vKXbq.png
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