new.target is not supported

Rule arkts-no-new-target

Severity: error

ArkTS does not support new.target because there is no concept of runtime prototype inheritance in the language. This feature is considered not applicable to static typing.

TypeScript

    class CustomError extends Error {
        constructor(message?: string) {
            // 'Error' breaks prototype chain here:
            super(message)

            // Restore prototype chain:
            Object.setPrototypeOf(this, new.target.prototype)
        }
    }

ArkTS

    class CustomError extends Error {
        constructor(message?: string) {
            // Call parent's constructor, inheritance chain is static and
            // cannot be modified in runtime
            super(message)
            console.log(this instanceof Error) // true
        }
    }
    let ce = new CustomError()

See also

• Recipe 136: Prototype assignment is not supported (arkts-no-prototype-assignment)