Fix single quotes in framework interpolation

src/printer.ts

@@ -450,7 +450,13 @@ export class PugPrinter {
   }
 
   private frameworkFormat(code: string): string {
-    const options: Options = { ...this.codeInterpolationOptions };
+    const options: Options = {
+      ...this.codeInterpolationOptions,
+      // we need to keep the original singleQuote option
+      // see https://github.com/prettier/plugin-pug/issues/339
+      singleQuote: this.options.singleQuote,
+    };
+
     switch (this.framework) {
       case 'angular':
         options.parser = '__ng_interpolation';

tests/issues/issue-339/double-quotes.pug

@@ -0,0 +1,2 @@
+p {{ transform("text") }}
+p Hello {{ "World" }}.

tests/issues/issue-339/issue-339.test.ts

@@ -0,0 +1,45 @@
+import { readFileSync } from 'fs';
+import { resolve } from 'path';
+import { format } from 'prettier';
+import { describe, expect, test } from 'vitest';
+import { plugin } from './../../../src/index';
+
+describe('Issues', () => {
+  test('should handle singleQuote:true + pugSingleQuote:false in framework interpolation', () => {
+    const expected: string = readFileSync(
+      resolve(__dirname, 'single-quotes.pug'),
+      'utf8',
+    );
+    const code: string = readFileSync(
+      resolve(__dirname, 'double-quotes.pug'),
+      'utf8',
+    );
+    const actual: string = format(code, {
+      parser: 'pug',
+      plugins: [plugin],
+      singleQuote: true,
+      pugSingleQuote: false,
+    });
+
+    expect(actual).toBe(expected);
+  });
+
+  test('should handle singleQuote:false + pugSingleQuote:true in framework interpolation', () => {
+    const expected: string = readFileSync(
+      resolve(__dirname, 'double-quotes.pug'),
+      'utf8',
+    );
+    const code: string = readFileSync(
+      resolve(__dirname, 'single-quotes.pug'),
+      'utf8',
+    );
+    const actual: string = format(code, {
+      parser: 'pug',
+      plugins: [plugin],
+      singleQuote: false,
+      pugSingleQuote: true,
+    });
+
+    expect(actual).toBe(expected);
+  });
+});

tests/issues/issue-339/single-quotes.pug

@@ -0,0 +1,2 @@
+p {{ transform('text') }}
+p Hello {{ 'World' }}.