Introduce a schema for ConfigurationOptions.

This commit illustrates an approach, but is currently
failing the tests.

src/config.ts

@@ -1,6 +1,6 @@
 import * as fs from 'fs'
 import YAML from 'yaml'
-import * as z from 'zod'
+import { ConfigurationOptions, ConfigurationOptionsSchema } from './schemas'
 import path from 'path'
 
 export type Severity = "critical" | "high" | "moderate" | "low"
@@ -8,18 +8,11 @@ export type Severity = "critical" | "high" | "moderate" | "low"
 export const SEVERITIES = ["critical", "high", "moderate", "low"] as const
 export const CONFIG_FILEPATH = "./.github/dep-review.yml"
 
-type ConfigurationOptions = {
-    fail_on_severity: string,
-    allow_licenses: Array<string>,
-    deny_licenses: Array<string>
-}
-
 export function readConfigFile(filePath: string = CONFIG_FILEPATH): ConfigurationOptions {
     // By default we want to fail on all severities and allow all licenses.
     const defaultOptions: ConfigurationOptions = {
-        fail_on_severity: "low",
-        allow_licenses: ['all'],
-        deny_licenses: []
+        fail_on_severity: 'low',
+        allow_licenses: []
     }
 
     let data
@@ -34,16 +27,11 @@ export function readConfigFile(filePath: string = CONFIG_FILEPATH): Configuratio
         }
     }
 
+    // This is a copy of line 34, not sure why this is failing!
+    ConfigurationOptionsSchema.parse({ fail_on_severity: 'critical', allow_licenses: ['BSD', 'GPL 2'] })
+
     const values = YAML.parse(data)
+    const parsed = ConfigurationOptionsSchema.parse(values)
 
-    const parsed = z.object({
-        fail_on_severity: z.enum(SEVERITIES),
-        allow_licenses: z.array(z.string()),
-        deny_licenses: z.array(z.string())
-    })
-        .partial()
-        .refine(obj => !(obj.allow_licenses && obj.deny_licenses), "Can't specify both allow_licenses and deny_licenses")
-        .parse(values)
-
-    return <ConfigurationOptions>parsed;
+    return parsed;
 }