Index: node_modules/postcss/lib/css-syntax-error.js
===================================================================
--- node_modules/postcss/lib/css-syntax-error.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
+++ node_modules/postcss/lib/css-syntax-error.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
@@ -0,0 +1,133 @@
+'use strict'
+
+let pico = require('picocolors')
+
+let terminalHighlight = require('./terminal-highlight')
+
+class CssSyntaxError extends Error {
+  constructor(message, line, column, source, file, plugin) {
+    super(message)
+    this.name = 'CssSyntaxError'
+    this.reason = message
+
+    if (file) {
+      this.file = file
+    }
+    if (source) {
+      this.source = source
+    }
+    if (plugin) {
+      this.plugin = plugin
+    }
+    if (typeof line !== 'undefined' && typeof column !== 'undefined') {
+      if (typeof line === 'number') {
+        this.line = line
+        this.column = column
+      } else {
+        this.line = line.line
+        this.column = line.column
+        this.endLine = column.line
+        this.endColumn = column.column
+      }
+    }
+
+    this.setMessage()
+
+    if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, CssSyntaxError)
+    }
+  }
+
+  setMessage() {
+    this.message = this.plugin ? this.plugin + ': ' : ''
+    this.message += this.file ? this.file : '<css input>'
+    if (typeof this.line !== 'undefined') {
+      this.message += ':' + this.line + ':' + this.column
+    }
+    this.message += ': ' + this.reason
+  }
+
+  showSourceCode(color) {
+    if (!this.source) return ''
+
+    let css = this.source
+    if (color == null) color = pico.isColorSupported
+
+    let aside = text => text
+    let mark = text => text
+    let highlight = text => text
+    if (color) {
+      let { bold, gray, red } = pico.createColors(true)
+      mark = text => bold(red(text))
+      aside = text => gray(text)
+      if (terminalHighlight) {
+        highlight = text => terminalHighlight(text)
+      }
+    }
+
+    let lines = css.split(/\r?\n/)
+    let start = Math.max(this.line - 3, 0)
+    let end = Math.min(this.line + 2, lines.length)
+    let maxWidth = String(end).length
+
+    return lines
+      .slice(start, end)
+      .map((line, index) => {
+        let number = start + 1 + index
+        let gutter = ' ' + (' ' + number).slice(-maxWidth) + ' | '
+        if (number === this.line) {
+          if (line.length > 160) {
+            let padding = 20
+            let subLineStart = Math.max(0, this.column - padding)
+            let subLineEnd = Math.max(
+              this.column + padding,
+              this.endColumn + padding
+            )
+            let subLine = line.slice(subLineStart, subLineEnd)
+
+            let spacing =
+              aside(gutter.replace(/\d/g, ' ')) +
+              line
+                .slice(0, Math.min(this.column - 1, padding - 1))
+                .replace(/[^\t]/g, ' ')
+
+            return (
+              mark('>') +
+              aside(gutter) +
+              highlight(subLine) +
+              '\n ' +
+              spacing +
+              mark('^')
+            )
+          }
+
+          let spacing =
+            aside(gutter.replace(/\d/g, ' ')) +
+            line.slice(0, this.column - 1).replace(/[^\t]/g, ' ')
+
+          return (
+            mark('>') +
+            aside(gutter) +
+            highlight(line) +
+            '\n ' +
+            spacing +
+            mark('^')
+          )
+        }
+
+        return ' ' + aside(gutter) + highlight(line)
+      })
+      .join('\n')
+  }
+
+  toString() {
+    let code = this.showSourceCode()
+    if (code) {
+      code = '\n\n' + code + '\n'
+    }
+    return this.name + ': ' + this.message + code
+  }
+}
+
+module.exports = CssSyntaxError
+CssSyntaxError.default = CssSyntaxError