Add base app

components/common/result/index.ts

@@ -0,0 +1 @@
+export * as result from './result'

components/common/result/result.ts

@@ -0,0 +1,60 @@
+import { result } from '.'
+
+type Ok<T> = {
+  type: 'ok'
+  val: T
+}
+export const ok = <T>(val: T): Ok<T> => ({ type: 'ok', val })
+type Err<T> = {
+  type: 'err'
+  err: T
+}
+export const err = <T>(err: T): Err<T> => ({ type: 'err', err })
+
+export type Result<TOk, TErr> = Ok<TOk> | Err<TErr>
+
+export const isOk = <TOk, TErr>(r: result.Result<TOk, TErr>): boolean => {
+  switch (r.type) {
+    case 'ok':
+      return true
+    default:
+      return false
+  }
+}
+
+export const getValue = <TOk, TErr>(r: result.Result<TOk, TErr>): TOk => {
+  if (r.type === 'ok') {
+    return r.val
+  }
+
+  throw new Error(`couldn't get value as type is error: ${r.err}`)
+}
+
+export const tap = <TOk, TErr>(
+  r: result.Result<TOk, TErr>,
+  okFunc: (okRes: TOk) => void,
+  errFunc: (errRes: TErr) => void = (err) => {
+    console.log("default tap catch of error, note tap doesn't break chain")
+  }
+): result.Result<TOk, TErr> => {
+  switch (r.type) {
+    case 'ok':
+      okFunc(r.val)
+      break
+    case 'err':
+      errFunc(r.err)
+      break
+  }
+
+  return r
+}
+
+export const getError = <TOk, TErr = string>(
+  r: result.Result<TOk, TErr>
+): TErr => {
+  if (r.type === 'err') {
+    return r.err
+  }
+
+  throw new Error(`couldn't get value as type is ok: ${r.val}`)
+}