Surface noErrorTruncation option

Author: gcnew

src/compiler/commandLineParser.ts

@@ -126,6 +126,11 @@ namespace ts {
             type: "boolean",
             description: Diagnostics.Do_not_emit_outputs_if_any_errors_were_reported,
         },
+        {
+            name: "noErrorTruncation",
+            type: "boolean",
+            description: Diagnostics.Do_not_truncate_verbose_types,
+        },
         {
             name: "noImplicitAny",
             type: "boolean",

src/compiler/diagnosticMessages.json

@@ -2828,6 +2828,10 @@
         "category": "Message",
         "code": 6137
     },
+    "Do not truncate verbose types.": {
+        "category": "Message",
+        "code": 6138
+    },
     "Variable '{0}' implicitly has an '{1}' type.": {
         "category": "Error",
         "code": 7005

tests/baselines/reference/noErrorTruncation.errors.txt

@@ -0,0 +1,22 @@
+tests/cases/compiler/noErrorTruncation.ts(10,7): error TS2322: Type 'number' is not assignable to type '{ someLongOptionA: string; } | { someLongOptionB: string; } | { someLongOptionC: string; } | { someLongOptionD: string; } | { someLongOptionE: string; } | { someLongOptionF: string; }'.
+
+
+==== tests/cases/compiler/noErrorTruncation.ts (1 errors) ====
+    // @noErrorTruncation
+    
+    type SomeLongOptionA = { someLongOptionA: string }
+    type SomeLongOptionB = { someLongOptionB: string }
+    type SomeLongOptionC = { someLongOptionC: string }
+    type SomeLongOptionD = { someLongOptionD: string }
+    type SomeLongOptionE = { someLongOptionE: string }
+    type SomeLongOptionF = { someLongOptionF: string }
+    
+    const x: SomeLongOptionA
+          ~
+!!! error TS2322: Type 'number' is not assignable to type '{ someLongOptionA: string; } | { someLongOptionB: string; } | { someLongOptionC: string; } | { someLongOptionD: string; } | { someLongOptionE: string; } | { someLongOptionF: string; }'.
+           | SomeLongOptionB
+           | SomeLongOptionC
+           | SomeLongOptionD
+           | SomeLongOptionE
+           | SomeLongOptionF = 42;
+    

tests/baselines/reference/noErrorTruncation.js

@@ -0,0 +1,21 @@
+//// [noErrorTruncation.ts]
+// @noErrorTruncation
+
+type SomeLongOptionA = { someLongOptionA: string }
+type SomeLongOptionB = { someLongOptionB: string }
+type SomeLongOptionC = { someLongOptionC: string }
+type SomeLongOptionD = { someLongOptionD: string }
+type SomeLongOptionE = { someLongOptionE: string }
+type SomeLongOptionF = { someLongOptionF: string }
+
+const x: SomeLongOptionA
+       | SomeLongOptionB
+       | SomeLongOptionC
+       | SomeLongOptionD
+       | SomeLongOptionE
+       | SomeLongOptionF = 42;
+
+
+//// [noErrorTruncation.js]
+// @noErrorTruncation
+var x = 42;

tests/cases/compiler/noErrorTruncation.ts

@@ -0,0 +1,15 @@
+// @noErrorTruncation
+
+type SomeLongOptionA = { someLongOptionA: string }
+type SomeLongOptionB = { someLongOptionB: string }
+type SomeLongOptionC = { someLongOptionC: string }
+type SomeLongOptionD = { someLongOptionD: string }
+type SomeLongOptionE = { someLongOptionE: string }
+type SomeLongOptionF = { someLongOptionF: string }
+
+const x: SomeLongOptionA
+       | SomeLongOptionB
+       | SomeLongOptionC
+       | SomeLongOptionD
+       | SomeLongOptionE
+       | SomeLongOptionF = 42;