Bump flow to 0.80 and fix sourceType error (#8630)

packages/babel-parser/src/options.js

@@ -5,8 +5,10 @@ import type { PluginList } from "./plugin-utils";
 // A second optional argument can be given to further configure
 // the parser process. These options are recognized:
 
+export type SourceType = "script" | "module" | "unambiguous";
+
 export type Options = {
-  sourceType: "script" | "module" | "unambiguous",
+  sourceType: SourceType,
   sourceFilename?: string,
   startLine: number,
   allowAwaitOutsideFunction: boolean,

packages/babel-parser/src/types.js

@@ -1,5 +1,6 @@
 // @flow
 
+import type { SourceType } from "./options";
 import type { Token } from "./tokenizer";
 import type { SourceLocation } from "./util/location";
 
@@ -135,7 +136,7 @@ export type File = NodeBase & {
 
 export type Program = NodeBase & {
   type: "Program",
-  sourceType: "script" | "module",
+  sourceType: SourceType,
   body: Array<Statement | ModuleDeclaration>, // TODO: $ReadOnlyArray
   directives: $ReadOnlyArray<Directive>, // TODO: Not in spec
   interpreter: InterpreterDirective | null,