Strips flow directive fully (#9197)

packages/babel-plugin-transform-flow-strip-types/src/index.js

@@ -5,7 +5,7 @@ import { types as t } from "@babel/core";
 export default declare(api => {
   api.assertVersion(7);
 
-  const FLOW_DIRECTIVE = "@flow";
+  const FLOW_DIRECTIVE = /(@flow(\s+(strict(-local)?|weak))?|@noflow)/;
 
   let skipStrip = false;
 
@@ -28,7 +28,7 @@ export default declare(api => {
 
         if (comments) {
           for (const comment of (comments: Array<Object>)) {
-            if (comment.value.indexOf(FLOW_DIRECTIVE) >= 0) {
+            if (FLOW_DIRECTIVE.test(comment.value)) {
               directiveFound = true;
 
               // remove flow directive

packages/babel-plugin-transform-flow-strip-types/test/fixtures/strip-types/strip-comment-noflow/input.js

@@ -0,0 +1,2 @@
+// @noflow
+const a = 1;

packages/babel-plugin-transform-flow-strip-types/test/fixtures/strip-types/strip-comment-noflow/output.js

@@ -0,0 +1 @@
+const a = 1;

packages/babel-plugin-transform-flow-strip-types/test/fixtures/strip-types/strip-comment-strict-local/input.js

@@ -0,0 +1,2 @@
+// @flow strict-local
+const a = 1;

packages/babel-plugin-transform-flow-strip-types/test/fixtures/strip-types/strip-comment-strict-local/output.js

@@ -0,0 +1 @@
+const a = 1;

packages/babel-plugin-transform-flow-strip-types/test/fixtures/strip-types/strip-comment-strict/input.js

@@ -0,0 +1,2 @@
+// @flow strict
+const a = 1;

packages/babel-plugin-transform-flow-strip-types/test/fixtures/strip-types/strip-comment-strict/output.js

@@ -0,0 +1 @@
+const a = 1;

packages/babel-plugin-transform-flow-strip-types/test/fixtures/strip-types/strip-comment-weak/input.js

@@ -0,0 +1,2 @@
+// @flow weak
+const a = 1;

packages/babel-plugin-transform-flow-strip-types/test/fixtures/strip-types/strip-comment-weak/output.js

@@ -0,0 +1 @@
+const a = 1;