BigInt type for Flow (#10091)

* flow BigIntLiteralTypeAnnotation

* numericSeparator for flow test plugins

* fix flow tuple

* fix code review

packages/babel-parser/src/plugins/flow.js

@@ -1263,7 +1263,10 @@ export default (superClass: Class<Parser>): Class<Parser> =>
           });
 
         case tt.bracketL:
-          return this.flowParseTupleType();
+          this.state.noAnonFunctionType = false;
+          type = this.flowParseTupleType();
+          this.state.noAnonFunctionType = oldNoAnonFunctionType;
+          return type;
 
         case tt.relational:
           if (this.state.value === "<") {
@@ -1352,15 +1355,27 @@ export default (superClass: Class<Parser>): Class<Parser> =>
         case tt.plusMin:
           if (this.state.value === "-") {
             this.next();
-            if (!this.match(tt.num)) {
-              this.unexpected(null, `Unexpected token, expected "number"`);
+            if (this.match(tt.num)) {
+              return this.parseLiteral(
+                -this.state.value,
+                "NumberLiteralTypeAnnotation",
+                node.start,
+                node.loc.start,
+              );
             }
 
-            return this.parseLiteral(
-              -this.state.value,
-              "NumberLiteralTypeAnnotation",
-              node.start,
-              node.loc.start,
+            if (this.match(tt.bigint)) {
+              return this.parseLiteral(
+                -this.state.value,
+                "BigIntLiteralTypeAnnotation",
+                node.start,
+                node.loc.start,
+              );
+            }
+
+            this.unexpected(
+              null,
+              `Unexpected token, expected "number" or "bigint"`,
             );
           }
 
@@ -1371,6 +1386,12 @@ export default (superClass: Class<Parser>): Class<Parser> =>
             "NumberLiteralTypeAnnotation",
           );
 
+        case tt.bigint:
+          return this.parseLiteral(
+            this.state.value,
+            "BigIntLiteralTypeAnnotation",
+          );
+
         case tt._void:
           this.next();
           return this.finishNode(node, "VoidTypeAnnotation");

packages/babel-parser/test/fixtures/flow/literal-types/invalid-number-negative/options.json

@@ -1,3 +1,3 @@
 {
-  "throws": "Unexpected token, expected \"number\" (1:8)"
+  "throws": "Unexpected token, expected \"number\" or \"bigint\" (1:8)"
 }