refactor: use export function

src/choose.ts

@@ -6,7 +6,7 @@ import type { Choice } from './choice'
  * @returns choices[i].content
  * @throws random <= 0, random < 1 or choices.weight are not natural integers.
  */
-export const chooseOne = (choices: Choice[], random: number): string => {
+export function chooseOne(choices: Choice[], random: number): string {
   if (isNaN(random) || random < 0 || 1 <= random)
     throw RangeError('random arg should be 0 <= random < 1.')
   const sortedChoices = choices.sort((l, r) => r.weight - l.weight)

src/input.ts

@@ -1,25 +1,20 @@
-import type { InputOptions } from '@actions/core'
 import { getInput } from '@actions/core'
 
 import type { Choice } from './choice'
 
-/** Gets the values of an multi-line input.
- * @param name name of the input to get
- * @param options optional. See InputOptions.
- * @returns string[]
- */
-const getMultipleInput = (name: string, options?: InputOptions): string[] =>
-  getInput(name, options)
-    .split('\n')
-    .filter(x => x !== '')
-
 /** Gets the values of user inputs.
  * @returns Parsed user inputs
  * @throws contents is empty, weights is not natural number,
  * or contents length not equals weights one.
  * @see {@link ../action.yml}
  */
-export const getInputs = (): Choice[] => {
+export function getInputs(): Choice[] {
+  type InputOptions = Parameters<typeof getInput>[1]
+  const getMultipleInput = (name: string, options?: InputOptions) =>
+    getInput(name, options)
+      .split('\n')
+      .filter(x => x !== '')
+
   const contents = getMultipleInput('contents', { required: true })
   const weights = getMultipleInput('weights').map(s => parseInt(s.trim(), 10))