Variable writeable

Type declaration

• • (jsonSchema: Fixpoint, options?: deepClone.Options): string

  • JsonSchema.deepClone.writeable

    Derive a "writeable" (stringified) deep clone function from a JSON Schema spec.

    The generated cloning function is significantly faster than JavaScript's built-in structuredClone structuredClone:

    • ~3x faster with shallow schemas
    • ~10x faster with large schemas

    It's even faster when compared with Lodash's cloneDeep:

    • ~9x faster with shallow schemas
    • ~25x faster with large schemas

    This is possible because the cloning function knows the shape of your data ahead of time, and will do the minimum amount of work necessary to create a new copy of your data.

    Note that the "deep clone function" generated by JsonSchema.deepClone.writeable assumes that both values have already been validated. Passing invalid data to the clone function will result in undefined behavior. You don't have to worry about this as long as you

    JsonSchema.deepClone.writeable accepts an optional configuration object as its second argument; documentation for those options are available via hover on autocompletion.

    See also:

    • JsonSchema.deepClone

    Parameters

    • jsonSchema: Fixpoint
    • Optionaloptions: deepClone.Options

    Returns string

    Example

    import { JsonSchema } from '@traversable/json-schema'
    
    const deepClone = JsonSchema.deepClone.writeable({
      type: 'object',
      required: ['street1', 'city'],
      properties: {
        street1: { type: 'string' },
        street2: { type: 'string' },
        city: { type: 'string' },
      }
    }, { typeName: 'Type' })
    
    console.log(deepClone) 
    // =>
    // type Address = { street1: string; street2?: string; city: string; }
    // function clone(prev: Address): Address {
    //   return {
    //     street1: prev.street1,
    //     ...prev.street2 !== undefined && { street2: prev.street2 },
    //     city: prev.city
    //   }
    // }
    Copy