Support flow "match" syntax (#17681)

changelog_unreleased/flow/17681.md

@@ -0,0 +1,26 @@
+#### Add basic support for "match" syntax (#17681 by @fisker)
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+const e = match (a) {
+  1 => true,
+  'foo' => false,
+  2 => {obj: 'literal'},
+};
+
+// Prettier stable
+SyntaxError: Unexpected token `{`, expected the token `;` (1:21)
+> 1 | const e = match (a) {
+    |                     ^
+  2 |   1 => true,
+  3 |   'foo' => false,
+  4 |   2 => {obj: 'literal'},
+
+// Prettier main
+const e = match (a) {
+  1 => true,
+  "foo" => false,
+  2 => { obj: "literal" },
+};
+```