[flow][tests] Consistent no-flowlib behavior for tests

Summary:
Currently for saved state tests, we have an inconsistent `no-flowlib` setup. During the initial state saving, we run it with the default on `--no-flowlib`, but when running the test script, we don't pass the flag (because there was no way to pass it by environement variables). It caused an inconsistency between saved-state and the real state.

Until now, it just happens to work, because we strip most of the libdef stuff from saved-state. But it will break in the next diff when we will add libdef stuff into saved state. This diff adds env-var support for `--no-flowlib`, so that the entire test suite with saved state can run in a consistent environment.

Changelog: [internal]

Reviewed By: panagosg7

Differential Revision: D69599623

fbshipit-source-id: e07b7ffe1f5955572ab529abc00de5d21b125b0a

Author: SamChou19815

scripts/run-one-test

@@ -537,6 +537,9 @@ runtest() {
                 (
                   set -e # The script should probably use this option
                   export PATH="$THIS_DIR/scripts/tests_bin:$PATH"
+                  if [ "$flowlib" == " --no-flowlib" ]; then
+                    export NO_FLOWLIB=1
+                  fi
                   source "$shell" "$FLOW"
                 ) 1> "$abs_out_file" 2> "$stderr_dest"
                 code=$?

src/commands/commandUtils.ml

@@ -1023,7 +1023,7 @@ let options_flags =
            (optional bool)
            ~doc:
              "If true, always wait for rechecks to finish before serving commands (default: false)"
-      |> flag "--no-flowlib" truthy ~doc:"Do not include embedded declarations"
+      |> flag "--no-flowlib" truthy ~doc:"Do not include embedded declarations" ~env:"NO_FLOWLIB"
       |> flag
            "--munge-underscore-members"
            truthy

tests/libdef_outside_of_root/libdef_outside_of_root.exp

@@ -12,5 +12,13 @@ References:
                  ^^^ [2]
 
 
+Error ------------------------------------------------------------------------------------------- root/use-react.js:1:19
 
-Found 1 error
+Cannot resolve module `react`. [cannot-resolve-module]
+
+   1| import React from 'react';
+                        ^^^^^^^
+
+
+
+Found 2 errors

tests/libdef_parse_error_lazy_mode/libdef_parse_error_lazy_mode.exp

@@ -9,5 +9,5 @@ Unexpected token `;`, expected an identifier
 
 Found 1 error
 
-The Flow server is currently in lazy mode and is only checking 0/12 files.
+The Flow server is currently in lazy mode and is only checking 0/1 files.
 To learn more, visit flow.org/en/docs/lang/lazy-modes

tests/saved_state_reinit_upstream_change_git/saved_state_reinit_upstream_change_git.exp

@@ -15,15 +15,15 @@ Found correct merge base hash: Yes
 No new errors:
 No errors!
 
-The Flow server is currently in lazy mode and is only checking 14/15 files.
+The Flow server is currently in lazy mode and is only checking 3/4 files.
 To learn more, visit flow.org/en/docs/lang/lazy-modes
 
 Moving to commit 2
 
 No new errors:
 No errors!
 
-The Flow server is currently in lazy mode and is only checking 0/15 files.
+The Flow server is currently in lazy mode and is only checking 0/4 files.
 To learn more, visit flow.org/en/docs/lang/lazy-modes
 
 Found correct merge base hash: Yes

tests/saved_state_reinit_with_lib_changes/saved_state_reinit_with_lib_changes.exp

@@ -1,8 +1,8 @@
 No errors!
 
-The Flow server is currently in lazy mode and is only checking 13/13 files.
+The Flow server is currently in lazy mode and is only checking 2/2 files.
 To learn more, visit flow.org/en/docs/lang/lazy-modes
 No errors!
 
-The Flow server is currently in lazy mode and is only checking 1/14 files.
+The Flow server is currently in lazy mode and is only checking 1/3 files.
 To learn more, visit flow.org/en/docs/lang/lazy-modes

tests/saved_state_update_parse_error/saved_state_update_parse_error.exp

@@ -11,7 +11,7 @@ Unexpected identifier, expected the token `)`
 
 Found 1 error
 
-The Flow server is currently in lazy mode and is only checking 13/13 files.
+The Flow server is currently in lazy mode and is only checking 2/2 files.
 To learn more, visit flow.org/en/docs/lang/lazy-modes
 
 Parse error, but no typing error in b.js:
@@ -27,5 +27,5 @@ Unexpected identifier, expected the token `)`
 
 Found 1 error
 
-The Flow server is currently in lazy mode and is only checking 13/13 files.
+The Flow server is currently in lazy mode and is only checking 2/2 files.
 To learn more, visit flow.org/en/docs/lang/lazy-modes

tests/saved_state_update_whitespace/saved_state_update_whitespace.exp

@@ -1,4 +1,4 @@
 No errors!
 
-The Flow server is currently in lazy mode and is only checking 14/14 files.
+The Flow server is currently in lazy mode and is only checking 3/3 files.
 To learn more, visit flow.org/en/docs/lang/lazy-modes