zjsunit: Split deprecated __Rewire__ functionality out of with_field.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

frontend_tests/node_tests/buddy_data.js

@@ -4,7 +4,7 @@ const {strict: assert} = require("assert");
 
 const _ = require("lodash");
 
-const {mock_esm, with_field, zrequire} = require("../zjsunit/namespace");
+const {mock_esm, with_field_rewire, zrequire} = require("../zjsunit/namespace");
 const {run_test} = require("../zjsunit/test");
 const blueslip = require("../zjsunit/zblueslip");
 const {page_params, user_settings} = require("../zjsunit/zpage_params");
@@ -456,7 +456,7 @@ test("bulk_data_hacks", () => {
 
     // Make our shrink limit higher, and go back to an empty search.
     // We won't get all 1000 users, just the present ones.
-    with_field(buddy_data, "max_size_before_shrinking", 50000, () => {
+    with_field_rewire(buddy_data, "max_size_before_shrinking", 50000, () => {
         user_ids = buddy_data.get_filtered_and_sorted_user_ids("");
     });
     assert.equal(user_ids.length, 700);

frontend_tests/node_tests/composebox_typeahead.js

@@ -2,7 +2,7 @@
 
 const {strict: assert} = require("assert");
 
-const {mock_esm, set_global, with_field, zrequire} = require("../zjsunit/namespace");
+const {mock_esm, set_global, with_field_rewire, zrequire} = require("../zjsunit/namespace");
 const {run_test} = require("../zjsunit/test");
 const $ = require("../zjsunit/zjquery");
 const {page_params, user_settings} = require("../zjsunit/zpage_params");
@@ -433,9 +433,14 @@ test("content_typeahead_selected", ({override_rewire}) => {
 
     fake_this.query = "@back";
     fake_this.token = "back";
-    with_field(compose_validate, "warn_if_mentioning_unsubscribed_user", unexpected_warn, () => {
+    with_field_rewire(
+        compose_validate,
+        "warn_if_mentioning_unsubscribed_user",
+        unexpected_warn,
+        () => {
             actual_value = ct.content_typeahead_selected.call(fake_this, backend);
-    });
+        },
+    );
     expected_value = "@*Backend* ";
     assert.equal(actual_value, expected_value);
 
@@ -453,9 +458,14 @@ test("content_typeahead_selected", ({override_rewire}) => {
 
     fake_this.query = "@_kin";
     fake_this.token = "kin";
-    with_field(compose_validate, "warn_if_mentioning_unsubscribed_user", unexpected_warn, () => {
+    with_field_rewire(
+        compose_validate,
+        "warn_if_mentioning_unsubscribed_user",
+        unexpected_warn,
+        () => {
             actual_value = ct.content_typeahead_selected.call(fake_this, hamlet);
-    });
+        },
+    );
 
     expected_value = "@_**King Hamlet** ";
     assert.equal(actual_value, expected_value);
@@ -480,9 +490,14 @@ test("content_typeahead_selected", ({override_rewire}) => {
 
     fake_this.query = "@_back";
     fake_this.token = "back";
-    with_field(compose_validate, "warn_if_mentioning_unsubscribed_user", unexpected_warn, () => {
+    with_field_rewire(
+        compose_validate,
+        "warn_if_mentioning_unsubscribed_user",
+        unexpected_warn,
+        () => {
             actual_value = ct.content_typeahead_selected.call(fake_this, backend);
-    });
+        },
+    );
     expected_value = "@_*Backend* ";
     assert.equal(actual_value, expected_value);
 
@@ -1578,7 +1593,7 @@ test("message people", ({override}) => {
     };
 
     function get_results(search_key) {
-        return with_field(ct, "max_num_items", 2, () =>
+        return with_field_rewire(ct, "max_num_items", 2, () =>
             ct.get_person_suggestions(search_key, opts),
         );
     }

frontend_tests/node_tests/markdown.js

@@ -4,7 +4,7 @@ const {strict: assert} = require("assert");
 
 const markdown_test_cases = require("../../zerver/tests/fixtures/markdown_test_cases");
 const markdown_assert = require("../zjsunit/markdown_assert");
-const {set_global, with_field, zrequire} = require("../zjsunit/namespace");
+const {set_global, with_field_rewire, zrequire} = require("../zjsunit/namespace");
 const {run_test} = require("../zjsunit/test");
 const blueslip = require("../zjsunit/zblueslip");
 const {page_params, user_settings} = require("../zjsunit/zpage_params");
@@ -833,7 +833,7 @@ test("missing unicode emojis", ({override_rewire}) => {
 test("katex_throws_unexpected_exceptions", () => {
     blueslip.expect("error", "Error: some-exception");
     const message = {raw_content: "$$a$$"};
-    with_field(
+    with_field_rewire(
         markdown,
         "katex",
         {

frontend_tests/node_tests/message_flags.js

@@ -2,7 +2,7 @@
 
 const {strict: assert} = require("assert");
 
-const {mock_esm, set_global, with_field, zrequire} = require("../zjsunit/namespace");
+const {mock_esm, set_global, with_field_rewire, zrequire} = require("../zjsunit/namespace");
 const {run_test} = require("../zjsunit/test");
 
 const channel = mock_esm("../../static/js/channel");
@@ -151,7 +151,7 @@ run_test("read", ({override}) => {
 
     // For testing purpose limit the batch size value to 5 instead of 1000
     function send_read(messages) {
-        with_field(message_flags, "_unread_batch_size", 5, () => {
+        with_field_rewire(message_flags, "_unread_batch_size", 5, () => {
             message_flags.send_read(messages);
         });
     }
@@ -270,7 +270,7 @@ run_test("read_empty_data", ({override}) => {
 
     // For testing purpose limit the batch size value to 5 instead of 1000
     function send_read(messages) {
-        with_field(message_flags, "_unread_batch_size", 5, () => {
+        with_field_rewire(message_flags, "_unread_batch_size", 5, () => {
             message_flags.send_read(messages);
         });
     }

frontend_tests/node_tests/message_list_data.js

@@ -2,7 +2,7 @@
 
 const {strict: assert} = require("assert");
 
-const {set_global, with_field, zrequire} = require("../zjsunit/namespace");
+const {set_global, with_field_rewire, zrequire} = require("../zjsunit/namespace");
 const {run_test} = require("../zjsunit/test");
 const blueslip = require("../zjsunit/zblueslip");
 
@@ -129,7 +129,7 @@ run_test("muting", () => {
 
     // `messages_filtered_for_topic_mutes` should skip filtering
     // messages if `excludes_muted_topics` is false.
-    with_field(
+    with_field_rewire(
         muted_topics,
         "is_topic_muted",
         () => {
@@ -145,7 +145,7 @@ run_test("muting", () => {
 
     // If we are in a 1:1 PM narrow, `messages_filtered_for_user_mutes` should skip
     // filtering messages.
-    with_field(
+    with_field_rewire(
         muted_topics,
         "is_user_muted",
         () => {

frontend_tests/node_tests/message_store.js

@@ -2,7 +2,7 @@
 
 const {strict: assert} = require("assert");
 
-const {mock_esm, set_global, with_field, zrequire} = require("../zjsunit/namespace");
+const {mock_esm, set_global, with_field_rewire, zrequire} = require("../zjsunit/namespace");
 const {run_test} = require("../zjsunit/test");
 const blueslip = require("../zjsunit/zblueslip");
 const {page_params} = require("../zjsunit/zpage_params");
@@ -227,7 +227,7 @@ test("errors", () => {
     };
 
     // This should early return and not run pm_conversations.set_partner
-    with_field(
+    with_field_rewire(
         pm_conversations,
         "set_partner",
         () => assert.fail(),

frontend_tests/node_tests/narrow.js

@@ -2,7 +2,7 @@
 
 const {strict: assert} = require("assert");
 
-const {with_field, zrequire} = require("../zjsunit/namespace");
+const {with_field_rewire, zrequire} = require("../zjsunit/namespace");
 const {run_test} = require("../zjsunit/test");
 const $ = require("../zjsunit/zjquery");
 const {page_params} = require("../zjsunit/zpage_params");
@@ -550,7 +550,7 @@ run_test("show_invalid_narrow_message", ({mock_template}) => {
 
 run_test("narrow_to_compose_target errors", () => {
     function test() {
-        with_field(
+        with_field_rewire(
             narrow,
             "activate",
             () => {

frontend_tests/node_tests/pm_list.js

@@ -2,7 +2,7 @@
 
 const {strict: assert} = require("assert");
 
-const {mock_esm, with_field, zrequire} = require("../zjsunit/namespace");
+const {mock_esm, with_field_rewire, zrequire} = require("../zjsunit/namespace");
 const {run_test} = require("../zjsunit/test");
 const $ = require("../zjsunit/zjquery");
 
@@ -268,7 +268,7 @@ test("ensure coverage", ({override}) => {
     // where functions early exit.
     override(narrow_state, "active", () => false);
 
-    with_field(
+    with_field_rewire(
         pm_list,
         "rebuild_recent",
         () => {

frontend_tests/node_tests/presence.js

@@ -2,7 +2,7 @@
 
 const {strict: assert} = require("assert");
 
-const {mock_esm, with_field, zrequire} = require("../zjsunit/namespace");
+const {mock_esm, with_field_rewire, zrequire} = require("../zjsunit/namespace");
 const {run_test} = require("../zjsunit/test");
 const blueslip = require("../zjsunit/zblueslip");
 const {user_settings} = require("../zjsunit/zpage_params");
@@ -100,7 +100,7 @@ test("unknown user", ({override}) => {
     // If the server is suspected to be offline or reloading,
     // then we suppress errors.  The use case here is that we
     // haven't gotten info for a brand new user yet.
-    with_field(
+    with_field_rewire(
         watchdog,
         "suspects_user_is_offline",
         () => true,

frontend_tests/node_tests/stream_topic_history.js

@@ -2,7 +2,7 @@
 
 const {strict: assert} = require("assert");
 
-const {mock_esm, with_field, zrequire} = require("../zjsunit/namespace");
+const {mock_esm, with_field_rewire, zrequire} = require("../zjsunit/namespace");
 const {run_test} = require("../zjsunit/test");
 
 const channel = mock_esm("../../static/js/channel");
@@ -137,7 +137,7 @@ test("is_complete_for_stream_id", () => {
         first: () => ({id: 5}),
     };
 
-    with_field(all_messages_data, "all_messages_data", all_messages_data_stub, () => {
+    with_field_rewire(all_messages_data, "all_messages_data", all_messages_data_stub, () => {
         assert.equal(stream_topic_history.is_complete_for_stream_id(sub.stream_id), true);
 
         // Now simulate a more recent message id.

frontend_tests/zjsunit/namespace.js

@@ -322,14 +322,11 @@ exports.finish = function () {
 
 exports.with_field = function (obj, field, val, f) {
     if ("__esModule" in obj && "__Rewire__" in obj) {
-        const old_val = field in obj ? obj[field] : obj.__GetDependency__(field);
-        try {
-            obj.__Rewire__(field, val);
-            return f();
-        } finally {
-            obj.__Rewire__(field, old_val);
+        throw new TypeError(
+            "Cannot mutate an ES module from outside. Consider exporting a test helper function from it instead.",
+        );
     }
-    } else {
+
     const had_val = Object.prototype.hasOwnProperty.call(obj, field);
     const old_val = obj[field];
     try {
@@ -342,6 +339,20 @@ exports.with_field = function (obj, field, val, f) {
             delete obj[field];
         }
     }
+};
+
+exports.with_field_rewire = function (obj, field, val, f) {
+    // This is deprecated because it relies on the slow
+    // babel-plugin-rewire-ts plugin.  Consider alternatives such
+    // as exporting a helper function for tests from the module
+    // containing the function you need to mock.
+
+    const old_val = field in obj ? obj[field] : obj.__GetDependency__(field);
+    try {
+        obj.__Rewire__(field, val);
+        return f();
+    } finally {
+        obj.__Rewire__(field, old_val);
     }
 };