Take the number of statements to report from a switch

microsoft · Apr 4, 2020 · 0da8143 · 0da8143
1 parent 5162827
commit 0da8143
Show file tree

Hide file tree

Showing 4 changed files with 26 additions and 11 deletions.
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -312,16 +312,6 @@ namespace ts {
         let constraintDepth = 0;
         let currentNode: Node | undefined;
 
-        interface ExpensiveStatement {
-            node: Node;
-            typeDelta: number;
-            symbolDelta: number;
-        }
-
-        let ignoreExpensiveStatement = true;
-        const maxExpensiveStatementCount = 5;
-        const expensiveStatements: ExpensiveStatement[] = [];
-
         const emptySymbols = createSymbolTable();
         const arrayVariances = [VarianceFlags.Covariant];
 
@@ -338,6 +328,16 @@ namespace ts {
         const keyofStringsOnly = !!compilerOptions.keyofStringsOnly;
         const freshObjectLiteralFlag = compilerOptions.suppressExcessPropertyErrors ? 0 : ObjectFlags.FreshLiteral;
 
+        interface ExpensiveStatement {
+            node: Node;
+            typeDelta: number;
+            symbolDelta: number;
+        }
+
+        let ignoreExpensiveStatement = true;
+        const maxExpensiveStatementCount = compilerOptions.expensiveStatements ?? 0;
+        const expensiveStatements: ExpensiveStatement[] = [];
+
         const emitResolver = createResolver();
         const nodeBuilder = createNodeBuilder();
 

diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
@@ -218,6 +218,12 @@ namespace ts {
             category: Diagnostics.Advanced_Options,
             description: Diagnostics.The_locale_used_when_displaying_messages_to_the_user_e_g_en_us
         },
+        {
+            name: "expensiveStatements",
+            type: "number",
+            category: Diagnostics.Advanced_Options,
+            description: Diagnostics.Heuristically_reports_statements_that_appear_to_contribute_disproportionately_to_check_time
+        },
     ];
 
     /* @internal */

diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
@@ -4388,6 +4388,10 @@
         "category": "Error",
         "code": 6231
     },
+    "Heuristically reports statements that appear to contribute disproportionately to check time.": {
+        "category": "Message",
+        "code": 6232
+    },
 
     "Projects to reference": {
         "category": "Message",
@@ -5645,7 +5649,7 @@
         "category": "Message",
         "code": 95116
     },
-    
+
     "No value exists in scope for the shorthand property '{0}'. Either declare one or provide an initializer.": {
         "category": "Error",
         "code": 18004
@@ -5733,5 +5737,9 @@
     "An optional chain cannot contain private identifiers.": {
         "category": "Error",
         "code": 18030
+    },
+    "Checking this statement may result in the creation of as many as {0} types and {1} symbols.": {
+        "category": "Warning",
+        "code": 19000
     }
 }
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
@@ -5152,6 +5152,7 @@ namespace ts {
         downlevelIteration?: boolean;
         emitBOM?: boolean;
         emitDecoratorMetadata?: boolean;
+        /*@internal*/ expensiveStatements?: number;
         experimentalDecorators?: boolean;
         forceConsistentCasingInFileNames?: boolean;
         /*@internal*/generateCpuProfile?: string;