start-sdk/lib/actions/createAction.ts

import { Parser } from "ts-matches"
import { Config } from "../config/builder"
import { ActionMetaData, ActionResult, Effects, ExportedAction } from "../types"
import { Utils, once, utils } from "../util"
import { TypeFromProps } from "../util/propertiesMatcher"
import { InputSpec } from "../config/configTypes"

export class CreatedAction<WrapperData, Input extends Config<InputSpec>> {
  private constructor(
    private myMetaData: Omit<ActionMetaData, "input"> & { input: Input },
    readonly fn: (options: {
      effects: Effects
      utils: Utils<WrapperData>
      input: TypeFromProps<Input>
    }) => Promise<ActionResult>,
  ) {}
  private validator = this.myMetaData.input.validator() as Parser<
    unknown,
    TypeFromProps<Input>
  >
  metaData = {
    ...this.myMetaData,
    input: this.myMetaData.input.build(),
  }

  static of<WrapperData, Input extends Config<InputSpec>>(
    metaData: Omit<ActionMetaData, "input"> & { input: Input },
    fn: (options: {
      effects: Effects
      utils: Utils<WrapperData>
      input: TypeFromProps<Input>
    }) => Promise<ActionResult>,
  ) {
    return new CreatedAction<WrapperData, Input>(metaData, fn)
  }

  exportedAction: ExportedAction = ({ effects, input }) => {
    return this.fn({
      effects,
      utils: utils<WrapperData>(effects),
      input: this.validator.unsafeCast(input),
    })
  }

  async exportAction(effects: Effects) {
    await effects.exportAction(this.metaData)
  }
}

export const createAction = CreatedAction.of