Adds checks for error message so that doesnt break (#197)

Co-authored-by: Bart Veneman <bart.veneman@drukwerkdeal.nl>

Author: bartveneman

package-lock.json

@@ -20,12 +20,10 @@ module.exports = async css => {
 
     return Promise.resolve(processNodes(rootNode))
   } catch (error) {
-    const {line, column, reason} = error
-    const message = error.showSourceCode
-      ? `${reason} at line ${line}, column ${column}:\n\n${error.showSourceCode(
-        false
-      )}`
-      : `${reason} at line ${line}, column ${column}:\n\n${error.source}`
+    const {line, column, reason, source} = error
+    const message = source && line && reason && column
+      ? `${reason} at line ${line}, column ${column}:\n\n${source}`
+      : error.message
 
     return Promise.reject(new SyntaxError(message))
   }

src/parser/index.js

@@ -5,9 +5,10 @@ test('it breaks with invalid CSS', async t => {
   const cssWithSyntaxError = 'a { color red }'
   const error = await t.throwsAsync(analyzer(cssWithSyntaxError))
 
+  t.true(error.message.includes('Unknown word at line 1, column 5:'))
   t.is(
     error.message,
-    'Unknown word at line 1, column 5:\n\n> 1 | a { color red }\n    |     ^'
+    'Unknown word at line 1, column 5:\n\na { color red }'
   )
 })
 

test/analyzer/index.js

@@ -29,8 +29,9 @@ test('parser throws a useful error on invalid CSS', async t => {
   const cssWithSyntaxError = 'a { color red }'
   const error = await t.throwsAsync(parser(cssWithSyntaxError))
 
+  t.true(error.message.includes('Unknown word at line 1, column 5:'))
   t.is(
     error.message,
-    'Unknown word at line 1, column 5:\n\n> 1 | a { color red }\n    |     ^'
+    'Unknown word at line 1, column 5:\n\na { color red }'
   )
 })