Function tProp

tProp(defaultValue): OptionalModelProp<string>
Defines a string model property with a default value. Equivalent to tProp(types.string, defaultValue).

Example:
```
x: tProp("foo") // an optional string that will take the value `"foo"` when undefined.
```
Parameters
- defaultValue: string
  Default value.
Returns OptionalModelProp<string>
tProp(defaultValue): OptionalModelProp<number>
Defines a number model property with a default value. Equivalent to tProp(types.number, defaultValue).

Example:
```
x: tProp(42) // an optional number that will take the value `42` when undefined.
```
Parameters
- defaultValue: number
  Default value.
Returns OptionalModelProp<number>
tProp(defaultValue): OptionalModelProp<boolean>
Defines a boolean model property with a default value. Equivalent to tProp(types.boolean, defaultValue).

Example:
```
x: tProp(true) // an optional boolean that will take the value `true` when undefined.
```
Parameters
- defaultValue: boolean
  Default value.
Returns OptionalModelProp<boolean>
tProp<TType>(type, defaultFn): OptionalModelProp<TypeToData<TType>>
Defines a model property, with an optional function to generate a default value if the input snapshot / model creation data is null or undefined and with an associated type checker.

Example:
```
x: tProp(types.number, () => 10) // an optional number, with a default value of 10
x: tProp(types.array(types.number), () => []) // an optional number array, with a default empty array
```
Type Parameters
- TType extends AnyType
Parameters
- type: TType
  Type checker.
- defaultFn: (() => TypeToData<TType>)
  Default value generator function.
  - - (): TypeToData<TType>
    - Returns TypeToData<TType>
Returns OptionalModelProp<TypeToData<TType>>
Typeparam
TType Type checker type.
tProp<TType>(type, defaultValue): OptionalModelProp<TypeToData<TType>>
Defines a model property, with an optional default value if the input snapshot / model creation data is null or undefined and with an associated type checker. You should only use this with primitive values and never with object values (array, model, object, etc).

Example:
```
x: tProp(types.number, 10) // an optional number, with a default value of 10
```
Type Parameters
- TType extends AnyType
Parameters
- type: TType
  Type checker.
- defaultValue: TypeToData<TType>
  Default value generator function.
Returns OptionalModelProp<TypeToData<TType>>
Typeparam
TType Type checker type.
tProp<TType>(type): MaybeOptionalModelProp<TypeToData<TType>>
Defines a model property with no default value and an associated type checker.

Example:
```
x: tProp(types.number) // a required number
x: tProp(types.maybe(types.number)) // an optional number, which defaults to undefined
```
Type Parameters
- TType extends AnyType
Parameters
- type: TType
  Type checker.
Returns MaybeOptionalModelProp<TypeToData<TType>>
Typeparam
TType Type checker type.