add method to filter changes by given scopes

__tests__/filter.test.ts

@@ -1,6 +1,6 @@
 import {expect, test} from '@jest/globals'
 import {Change, Changes} from '../src/schemas'
-import {filterChangesBySeverity} from '../src/filter'
+import {filterChangesBySeverity, filterChangesByScopes} from '../src/filter'
 
 let npmChange: Change = {
   manifest: 'package.json',
@@ -59,3 +59,16 @@ test('it properly filters changes by severity', async () => {
   result = filterChangesBySeverity('critical', changes)
   expect(changes).toEqual([npmChange, rubyChange])
 })
+
+test('it properly filters changes by scope', async () => {
+  const changes = [npmChange, rubyChange]
+
+  let result = filterChangesByScopes(['runtime'], changes)
+  expect(result).toEqual([npmChange])
+
+  result = filterChangesByScopes(['development'], changes)
+  expect(result).toEqual([rubyChange])
+
+  result = filterChangesByScopes(['runtime', 'development'], changes)
+  expect(result).toEqual([npmChange, rubyChange])
+})

src/filter.ts

@@ -1,4 +1,4 @@
-import {Changes, Severity, SEVERITIES} from './schemas'
+import {Changes, Severity, SEVERITIES, Scope, SCOPES} from './schemas'
 
 export function filterChangesBySeverity(
   severity: Severity,
@@ -33,3 +33,16 @@ export function filterChangesBySeverity(
   )
   return filteredChanges
 }
+
+export function filterChangesByScopes(
+  scopes: Scope[],
+  changes: Changes
+): Changes {
+  const filteredChanges = changes.filter(change => {
+    if (scopes.indexOf(change.scope) > -1) {
+      return true
+    }
+  })
+
+  return filteredChanges
+}