Implement

src/action.ts

@@ -4,7 +4,7 @@ import fm from 'front-matter'
 import nunjucks from 'nunjucks'
 // @ts-ignore
 import dateFilter from 'nunjucks-date-filter'
-import { FrontMatterAttributes, listToArray, setOutputs } from './helpers'
+import { FrontMatterAttributes, frontmatterSchema, listToArray, setOutputs } from './helpers'
 
 function logError(tools: Toolkit, template: string, action: 'creating' | 'updating', err: any) {
   // Log the error message
@@ -50,7 +50,8 @@ export async function createAnIssue (tools: Toolkit) {
   const file = await tools.readFile(template) as string
 
   // Grab the front matter as JSON
-  const { attributes, body } = fm<FrontMatterAttributes>(file)
+  const { attributes: rawAttributes, body } = fm<FrontMatterAttributes>(file)
+  const attributes = await frontmatterSchema.parseAsync(rawAttributes)
   tools.log(`Front matter for ${template} is`, attributes)
 
   const templated = {

src/helpers.ts

@@ -1,11 +1,14 @@
 import { Toolkit } from 'actions-toolkit'
+import { z } from 'zod'
 
-export interface FrontMatterAttributes {
-  title: string
-  assignees?: string[] | string
-  labels?: string[] | string
-  milestone?: string | number
-}
+export const frontmatterSchema = z.object({
+  title: z.string(),
+  assignees: z.union([z.array(z.string()), z.string()]).optional(),
+  labels: z.union([z.array(z.string()), z.string()]).optional(),
+  milestone: z.union([z.string(), z.number()]).optional()
+})
+
+export type FrontMatterAttributes = z.infer<typeof frontmatterSchema>
 
 export function setOutputs (tools: Toolkit, issue: { number: number, html_url: string }) {
   tools.outputs.number = String(issue.number)