filter out shared from yaml anchor output

__tests__/export.test.ts

@@ -0,0 +1,51 @@
+import * as core from '@actions/core'
+import {Filter} from '../src/filter'
+import {File, ChangeStatus} from '../src/file'
+import {exportResults} from '../src/main'
+
+jest.mock('@actions/core', () => ({
+  info: jest.fn(),
+  setFailed: jest.fn(),
+  startGroup: jest.fn(),
+  setOutput: jest.fn(),
+  endGroup: jest.fn()
+}))
+
+describe('set output post filtering', () => {
+  test('correctly sets output', () => {
+    const yaml = `
+    backend:
+      - '!(**/*.tsx|**/*.less)'
+    `
+    const filter = new Filter(yaml)
+    const files = modified(['config/settings.yml'])
+    const match = filter.match(files)
+    exportResults(match, 'none')
+
+    expect(core.setOutput).toHaveBeenCalledWith('changes', '["backend"]')
+  })
+  test('correctly filters out shared from output', () => {
+    const yaml = `
+    shared: &shared
+      - common/**/*
+      - config/**/*
+    src:
+      - *shared
+      - src/**/*
+    backend:
+      - '!(**/*.tsx|**/*.less)'
+    `
+    const filter = new Filter(yaml)
+    const files = modified(['config/settings.yml'])
+    const match = filter.match(files)
+    exportResults(match, 'none')
+
+    expect(core.setOutput).toHaveBeenCalledWith('changes', '["src","backend"]')
+  })
+})
+
+function modified(paths: string[]): File[] {
+  return paths.map(filename => {
+    return {filename, status: ChangeStatus.Modified}
+  })
+}

src/main.ts

@@ -228,7 +228,7 @@ async function getChangedFilesFromApi(token: string, pullRequest: PullRequestEve
   }
 }
 
-function exportResults(results: FilterResults, format: ExportFormat): void {
+export function exportResults(results: FilterResults, format: ExportFormat): void {
   core.info('Results:')
   const changes = []
   for (const [key, files] of Object.entries(results)) {
@@ -254,7 +254,8 @@ function exportResults(results: FilterResults, format: ExportFormat): void {
   }
 
   if (results['changes'] === undefined) {
-    const changesJson = JSON.stringify(changes)
+    const filteredShared = changes.filter(change => change !== 'shared')
+    const changesJson = JSON.stringify(filteredShared)
     core.info(`Changes output set to ${changesJson}`)
     core.setOutput('changes', changesJson)
   } else {