Remove postcss-reporter package (#4858)

* Remove `postcss-reporter` package

This change removes the `postcss-reporter` package and reduces the dependencies.
As you see the changed `package-lock.json`, this package depends on:

- `chalk`
- `lodash`
- `log-symbols`
- `postcss`

See also #2454 (comment)

We've used only the tiny utility function `getLocation()` in the package.
This function just returns an object with the `line` and `column` property in our project,
so I think we can replace it with a simple code.

https://github.com/postcss/postcss-reporter/blob/f01a601ea2cd41d626e561969d66a765b3afcb2d/lib/util.js#L4-L13

* Fix test name: `stringFormatter` -> `verboseFormatter`

lib/formatters/__tests__/verboseFormatter.test.js

@@ -4,7 +4,7 @@ const prepareFormatterOutput = require('./prepareFormatterOutput');
 const stripIndent = require('common-tags').stripIndent;
 const verboseFormatter = require('../verboseFormatter');
 
-describe('stringFormatter', () => {
+describe('verboseFormatter', () => {
 	it('outputs no warnings', () => {
 		const results = [
 			{

lib/formatters/stringFormatter.js

@@ -6,7 +6,6 @@ const path = require('path');
 const stringWidth = require('string-width');
 const symbols = require('log-symbols');
 const table = require('table');
-const utils = require('postcss-reporter/lib/util');
 
 const MARGIN_WIDTHS = 9;
 
@@ -134,14 +133,14 @@ function formatter(messages, source) {
 	}
 
 	const cleanedMessages = orderedMessages.map((message) => {
-		const location = utils.getLocation(message);
+		const { line, column } = message;
 		const severity = /** @type {keyof import('log-symbols')} */ (message.severity);
 		/**
 		 * @type {[string, string, string, string, string]}
 		 */
 		const row = [
-			location.line ? location.line.toString() : '',
-			location.column ? location.column.toString() : '',
+			line ? line.toString() : '',
+			column ? column.toString() : '',
 			symbols[severity]
 				? chalk[/** @type {'blue' | 'red' | 'yellow'} */ (levelColors[severity])](symbols[severity])
 				: severity,

package.json

@@ -139,7 +139,6 @@
     "postcss-html": "^0.36.0",
     "postcss-less": "^3.1.4",
     "postcss-media-query-parser": "^0.2.3",
-    "postcss-reporter": "^6.0.1",
     "postcss-resolve-nested-selector": "^0.1.1",
     "postcss-safe-parser": "^4.0.2",
     "postcss-sass": "^0.4.4",

types/postcss/index.d.ts

@@ -33,10 +33,6 @@ declare module 'postcss-syntax' {
 	export = result;
 }
 
-declare module 'postcss-reporter/lib/util' {
-	export function getLocation(message: Object): { line: number; column: number; file?: string };
-}
-
 declare module 'postcss/lib/result' {
 	import { Result } from 'postcss';