6 files changed, 29 insertions, 2 deletions
diff --git a/cli/fmt_errors.rs b/cli/fmt_errors.rs
index 73d6bb2d2..0a22b4625 100644
--- a/cli/fmt_errors.rs
+++ b/cli/fmt_errors.rs
@@ -10,6 +10,8 @@ use std::error::Error;
 use std::fmt;
 use std::ops::Deref;
 
+const SOURCE_ABBREV_THRESHOLD: usize = 150;
+
 /// A trait which specifies parts of a diagnostic like item needs to be able to
 /// generate to conform its display to other diagnostic like items
 pub trait DisplayFormatter {
@@ -74,8 +76,9 @@ pub fn format_maybe_source_line(
 
   let source_line = source_line.as_ref().unwrap();
   // sometimes source_line gets set with an empty string, which then outputs
-  // an empty source line when displayed, so need just short circuit here
-  if source_line.is_empty() {
+  // an empty source line when displayed, so need just short circuit here.
+  // Also short-circuit on error line too long.
+  if source_line.is_empty() || source_line.len() > SOURCE_ABBREV_THRESHOLD {
     return "".to_string();
   }
 
diff --git a/cli/tests/error_017_hide_long_source_ts.ts b/cli/tests/error_017_hide_long_source_ts.ts
new file mode 100644
index 000000000..a4c30670f
--- /dev/null
+++ b/cli/tests/error_017_hide_long_source_ts.ts
@@ -0,0 +1,2 @@
+const LONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONG = undefined;
+LONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONG.a;
diff --git a/cli/tests/error_017_hide_long_source_ts.ts.out b/cli/tests/error_017_hide_long_source_ts.ts.out
new file mode 100644
index 000000000..4b4016b84
--- /dev/null
+++ b/cli/tests/error_017_hide_long_source_ts.ts.out
@@ -0,0 +1,3 @@
+[WILDCARD]error TS2532: Object is possibly 'undefined'.
+
+► file:///[WILDCARD]cli/tests/error_017_hide_long_source_ts.ts:2:1
diff --git a/cli/tests/error_018_hide_long_source_js.js b/cli/tests/error_018_hide_long_source_js.js
new file mode 100644
index 000000000..a4c30670f
--- /dev/null
+++ b/cli/tests/error_018_hide_long_source_js.js
@@ -0,0 +1,2 @@
+const LONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONG = undefined;
+LONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONGLONG.a;
diff --git a/cli/tests/error_018_hide_long_source_js.js.out b/cli/tests/error_018_hide_long_source_js.js.out
new file mode 100644
index 000000000..dbdd924df
--- /dev/null
+++ b/cli/tests/error_018_hide_long_source_js.js.out
@@ -0,0 +1,3 @@
+error: Uncaught TypeError: Cannot read property 'a' of undefined
+► file:///[WILDCARD]cli/tests/error_018_hide_long_source_js.js:2:206
+    at file:///[WILDCARD]cli/tests/error_018_hide_long_source_js.js:2:206
diff --git a/cli/tests/integration_tests.rs b/cli/tests/integration_tests.rs
index ed5160565..437214dcc 100644
--- a/cli/tests/integration_tests.rs
+++ b/cli/tests/integration_tests.rs
@@ -1274,6 +1274,20 @@ itest!(error_016_dynamic_import_permissions2 {
   http_server: true,
 });
 
+itest!(error_017_hide_long_source_ts {
+  args: "--reload error_017_hide_long_source_ts.ts",
+  output: "error_017_hide_long_source_ts.ts.out",
+  check_stderr: true,
+  exit_code: 1,
+});
+
+itest!(error_018_hide_long_source_js {
+  args: "error_018_hide_long_source_js.js",
+  output: "error_018_hide_long_source_js.js.out",
+  check_stderr: true,
+  exit_code: 1,
+});
+
 itest!(error_stack {
   args: "run --reload error_stack.ts",
   check_stderr: true,