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Instance methods

createSafeActionClient creates an instance of the safe action client, which has the following methods:

use​

use<const NextCtx>(middlewareFn: MiddlewareFn<ServerError, Ctx, NextCtx, Metadata>) => new SafeActionClient()

use accepts a middleware function of type MiddlewareFn as argument and returns a new instance of the safe action client with that middleware function added to the stack, that will be executed after the last one, if any. Check out how to use middleware in the related section of the usage guide.

metadata​

metadata(data: Metadata) => { schema() }

metadata expects an argument of the same type as the return value of the defineMetadataSchema optional initialization function. If you don't provide this function to the action client when you initialize it, metadata will be null.

metadata lets you specify useful data about the safe action you're executing. If you don't use this method before defining your action (using action method), metadata will be null inside serverCodeFn. It returns the schema method, since metadata is action specific and not shared with other actions. You can then access it in the middlewareFn passed to use and in serverCodeFn passed to action.

schema​

schema<const S extends Schema | undefined = undefined, const FVE = ValidationErrors<S>, const MD = null>(schema: S, { utils?: { formatValidationErrors?: FormatValidationErrorsFn<S, FVE> } }) => { action(), bindArgsSchemas() }

schema accepts an optional input schema of type Schema (from TypeSchema) and an optional utils object that accepts a formatValidationErrors function. The schema is used to define the arguments that the safe action will receive, the optional formatValidationErrors function is used to return a custom format for validation errors. If you don't pass an input schema, parsedInput and validation errors will be typed undefined, and clientInput will be typed void. It returns the action and bindArgsSchemas methods, which allows you, respectively, to define a new action using that input schema or extend the arguments with additional bound ones.

bindArgsSchemas​

bindArgsSchemas<const BAS extends Schema[], const FBAVE = BindArgsValidationErrors<BAS>>(bindArgsSchemas: BAS, bindArgsUtils?: { formatBindArgsValidationErrors?: FormatBindArgsValidationErrorsFn<BAS, FBAVE> }) => { action() }

bindArgsSchemas accepts an array of bind input schemas of type Schema[] (from TypeSchema) and an optional bindArgsUtils object that accepts a formatBindArgsValidationErrors function. The schema is used to define the bind arguments that the safe action will receive, the optional formatBindArgsValidationErrors function is used to return a custom format for bind arguments validation errors. It returns the action method, which allows you, to define a new action using the input and bind inputs schemas.

action​

action<const Data = null>(serverCodeFn: ServerCodeFn<S, BAS, Data, Ctx, MD>) => SafeActionFn<ServerError, S, BAS, FVE, FBAVE, Data>

action is the final method in the list. It accepts a serverCodeFn of type ServerCodeFn and returns a new safe action function of type SafeActionFn, which can be called from your components. When an action doesn't need input arguments, you can directly use this method without passing a schema to schema method.

When the action is executed, all middleware functions in the chain will be called at runtime, in the order they were defined.

serverCodeFn​

serverCodeFn<S, BAS, Data, Ctx, MD> = (args: { parsedInput: Infer<S>, bindArgsParsedInputs: InferArray<BAS>, ctx: Ctx, metadata: MD }) => Promise<Data>;

serverCodeFn is the async function that will be executed on the server side when the action is invoked. If input validation fails, or execution gets halted in a middleware function, the server code function will not be called.