fix: suppress warnings when using --quiet

.changeset/mighty-ducks-invite.md

@@ -0,0 +1,5 @@
+---
+'lint-staged': patch
+---
+
+Suppress some warnings when using the "--quiet" flag

lib/runAll.js

@@ -108,7 +108,7 @@ export const runAll = async (
   // Lint-staged will create a backup stash only when there's an initial commit,
   // and when using the default list of staged files by default
   ctx.shouldBackup = hasInitialCommit && stash
-  if (!ctx.shouldBackup) {
+  if (!ctx.shouldBackup && !quiet) {
     logger.warn(skippingBackup(hasInitialCommit, diff))
   }
 
@@ -242,7 +242,7 @@ export const runAll = async (
     }
   }
 
-  if (hasDeprecatedGitAdd) {
+  if (hasDeprecatedGitAdd && !quiet) {
     logger.warn(DEPRECATED_GIT_ADD)
   }
 

test/unit/runAll.spec.js

@@ -338,15 +338,28 @@ describe('runAll', () => {
 
   it('should warn when "git add" was used in commands', async () => {
     getStagedFiles.mockImplementationOnce(async () => ['sample.js'])
-    await runAll({ configObject: { '*.js': ['git add'] } }).catch(() => {})
+    await expect(runAll({ configObject: { '*.js': ['git add'] } })).rejects.toThrowError()
     expect(console.printHistory()).toMatch('Some of your tasks use `git add` command')
   })
 
+  it('should not warn about "git add" when --quiet was used', async () => {
+    getStagedFiles.mockImplementationOnce(async () => ['sample.js'])
+    await expect(
+      runAll({ configObject: { '*.js': ['git add'] }, quiet: true })
+    ).rejects.toThrowError()
+    expect(console.printHistory()).toEqual('')
+  })
+
   it('should warn when --no-stash was used', async () => {
     await runAll({ configObject: { '*.js': ['echo "sample"'] }, stash: false })
     expect(console.printHistory()).toMatch('Skipping backup because `--no-stash` was used')
   })
 
+  it('should not warn when --no-stash was used together with --quiet', async () => {
+    await runAll({ configObject: { '*.js': ['echo "sample"'] }, stash: false, quiet: true })
+    expect(console.printHistory()).toEqual('')
+  })
+
   it('should warn when --diff was used', async () => {
     await runAll({ configObject: { '*.js': ['echo "sample"'] }, diff: 'branch1...branch2' })
     expect(console.printHistory()).toMatch('Skipping backup because `--diff` was used')