Fix unindenting inconsistently indented lines cutting off strings

Author: luttje

__tests__/utils/string.spec.ts

@@ -100,7 +100,7 @@ describe('unindentText', () => {
     ['  hello\n  world', 'hello\nworld'],
     ['    hello\n    world', 'hello\nworld'],
     ['\thello\n\tworld', 'hello\nworld'],
-    ['\thello\n\t world', 'hello\n world'],
+    ['\thello\n\t world\nyo', 'hello\n world\nyo'],
     ['\t\thello\n\t\tworld', 'hello\nworld'],
   ])('should unindent text by the given amount', (input, expected) => {
     expect(unindentText(input)).toBe(expected);

src/utils/string.ts

@@ -126,5 +126,14 @@ export function unindentText(text: string, indent: number = 0) {
   const firstLineIndent = lines[0].search(/\S/);
   const unindentAmount = indent > 0 ? indent : firstLineIndent;
 
-  return lines.map(line => line.slice(unindentAmount)).join('\n');
+  // Only unindent the line if it has at least the same amount of indent as the first line.
+  return lines.map(line => {
+    const lineIndent = line.search(/\S/);
+
+    if (lineIndent >= unindentAmount) {
+      return line.slice(unindentAmount);
+    } else {
+      return line;
+    }
+  }).join('\n');
 }