Sandbox::https://github.com/stacksjs/ts-validation/blob/main/src/helpers.ts

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// Helper utility functions for validation

export function isString(value: unknown): value is string {

return typeof value === 'string'

}

export function isNumber(value: unknown): value is number {

return typeof value === 'number' && !Number.isNaN(value)

}

export function isBoolean(value: unknown): value is boolean {

return typeof value === 'boolean'

}

export function isArray(value: unknown): value is any[] {

return Array.isArray(value)

}

export function isObject(value: unknown): value is Record<string, any> {

return typeof value === 'object' && value !== null && !Array.isArray(value)

}

export function isNull(value: unknown): value is null {

return value === null

}

export function isUndefined(value: unknown): value is undefined {

return typeof value === 'undefined'

}

export function isNullOrUndefined(value: unknown): value is null | undefined {

return isNull(value) || isUndefined(value)

}