errors.ts

export class PanicError extends Error {
    constructor(message: string, options?: ErrorOptions) {
        super(message, options);
        this.name = 'PanicError';
    }
}

export class InvalidArgumentError extends Error {
    constructor(message: string) {
        super(message);
        this.name = 'InvalidArgumentError';
    }
}

export class FlattenError extends InvalidArgumentError {
    constructor(message: string) {
        super(message);
        this.name = 'FlattenError';
    }
}

export function assertValueIsNotMissing<T>(
    value: T | null | undefined,
    message?: string
): asserts value is T {
    if (value === null || value === undefined)
        throw new InvalidArgumentError(
            message || 'Expected a non-null, non-undefined value'
        );
}