[babel 8] Enable allowDeclareFields option by default with TS (#12461)

scripts/integration-tests/e2e-babel.sh

@@ -20,6 +20,11 @@ cd ../..
 #                                   TEST                                       #
 #==============================================================================#
 
+if [ "$BABEL_8_BREAKING" = true ] ; then
+  # This option is removed in Babel 8
+  sed -i 's/allowDeclareFields: true,\?/\/* allowDeclareFields: true *\//g' babel.config.js
+fi
+
 startLocalRegistry "$PWD"/scripts/integration-tests/verdaccio-config.yml
 # We only bump dependencies in the top-level package.json, because workspaces
 # already use the workspace: protocol so will get the version in the monorepo

scripts/integration-tests/e2e-jest.sh

@@ -37,11 +37,6 @@ python --version
 #                                   TEST                                       #
 #==============================================================================#
 
-startLocalRegistry "$root"/verdaccio-config.yml
-yarn install
-yarn dedupe '@babel/*'
-yarn build
-
 # Workaround for https://github.com/babel/babel/pull/12567
 node -e '
   let snapshots = fs.readFileSync("packages/jest-message-util/src/__tests__/__snapshots__/messages.test.ts.snap", "utf8");
@@ -49,6 +44,16 @@ node -e '
   fs.writeFileSync("packages/jest-message-util/src/__tests__/__snapshots__/messages.test.ts.snap", snapshots);
 '
 
+if [ "$BABEL_8_BREAKING" = true ] ; then
+  # This option is removed in Babel 8
+  sed -i 's/allowDeclareFields: true,\?/\/* allowDeclareFields: true *\//g' babel.config.js
+fi
+
+startLocalRegistry "$root"/verdaccio-config.yml
+yarn install
+yarn dedupe '@babel/*'
+yarn build
+
 # The full test suite takes about 20mins on CircleCI. We run only a few of them
 # to speed it up.
 # The goals of this e2e test are: