fix: Fix typo causing complex string parsing to fail on subsequent runs (#31)

* Fix typo in complex string detection

Fix typo causing complex string detection not to trigger
correctly.

* Add changeset

* Add test

.changeset/two-days-nail.md

···
+---
+'@0no-co/graphql.web': patch
+---
+
+Fix typo causing complex string parsing to fail on subsequent runs.

src/__tests__/parser.test.ts

···
     }).toThrow();
   });
 
+  it('parses escaped characters', () => {
+    let ast = parse(`
+      { field(arg: "Has another \\\\x sequence.") }
+    `);
+    expect(ast).toHaveProperty(
+      'definitions.0.selectionSet.selections.0.arguments.0.value.value',
+      'Has another \\x sequence.'
+    );
+    ast = parse(`
+      { field(arg: "Has a \\\\x sequence.") }
+    `);
+    expect(ast).toHaveProperty(
+      'definitions.0.selectionSet.selections.0.arguments.0.value.value',
+      'Has a \\x sequence.'
+    );
+  });
+
   it('parses multi-byte characters', () => {
     // Note: \u0A0A could be naively interpreted as two line-feed chars.
     const ast = parse(`

src/parser.ts

···
   [Prop in ValueGroup]: string | undefined;
 };
 
-const complexStringRe = /\\/g;
+const complexStringRe = /\\/;
 
 function value(constant: true): ast.ConstValueNode;
 function value(constant: boolean): ast.ValueNode;