Miscellaneous Tips
Generate MST models from JSON
The following service can generate MST models based on JSON: https://transform.now.sh/json-to-mobx-state-tree
optionals and default value functions
types.optional can take an optional function parameter which will be invoked each time a default value is needed. This is useful to generate timestamps, identifiers or even complex objects, for example:
createdDate: types.optional(types.Date, () => new Date())
toJSON() for debugging
For debugging you might want to use getSnapshot(model, applyPostProcess) to print the state of a model. If you didn't import getSnapshot while debugging in some debugger, don't worry, model.toJSON() will produce the same snapshot. (For API consistency, this feature is not part of the typed API).
Optional/empty maps/arrays
Since v3, maps and arrays are optional by default, this is:
types.map(OtherType)
// is the same as
types.optional(types.map(OtherType), {})
types.array(OtherType)
// is the same as
types.optional(types.array(OtherType), [])
Building with production environment
MobX-state-tree provides a lot of dev-only checks. They check the correctness of function calls and perform runtime type-checks over your models. It is recommended to disable them in production builds. To do so, you should use webpack's DefinePlugin to set environment as production and remove them. More information could be found in the official webpack guides.