feat(cli): add --quiet / -q option

Stops any successful output. Errors are still outputted.

README.md

@@ -69,6 +69,15 @@ $ sort-package-json "**/package.json" --check
 # 2 of 5 matched files are not sorted.
 ```
 
+#### `--quiet` flag
+
+In order to silence any successful output, you can run CLI with the `--quiet` flag (or `-q`). This will stop the CLI from outputting if it runs successfully, but will still display errors if they occur. Exit codes will not change.
+
+```bash
+$ sort-package-json "**/package.json" --check --quiet
+$ sort-package-json "**/package.json" --quiet
+```
+
 ## API
 
 ### Install

cli.js

@@ -4,9 +4,11 @@ import { globbySync } from 'globby'
 import sortPackageJson from './index.js'
 
 const isCheckFlag = (argument) => argument === '--check' || argument === '-c'
+const isQuietFlag = (argument) => argument === '--quiet' || argument === '-q'
 
 const cliArguments = process.argv.slice(2)
 const isCheck = cliArguments.some(isCheckFlag)
+const isQuiet = cliArguments.some(isQuietFlag)
 
 const patterns = cliArguments.filter((argument) => !isCheckFlag(argument))
 
@@ -21,6 +23,8 @@ if (files.length === 0) {
   process.exit(1)
 }
 
+if (isQuiet) console.log = function () {}
+
 let notSortedFiles = 0
 
 files.forEach((file) => {