Merge pull request #10418 from zhengbli/tolerateConfigError

Tolerate errors in config file

src/services/utilities.ts

@@ -925,4 +925,24 @@ namespace ts {
         }
         return ensureScriptKind(fileName, scriptKind);
     }
+
+    export function parseAndReEmitConfigJSONFile(content: string) {
+        const options: TranspileOptions = {
+            fileName: "config.js",
+            compilerOptions: {
+                target: ScriptTarget.ES6
+            },
+            reportDiagnostics: true
+        };
+        const { outputText, diagnostics } = ts.transpileModule("(" + content + ")", options);
+        // Becasue the content was wrapped in "()", the start position of diagnostics needs to be subtract by 1
+        // also, the emitted result will have "(" in the beginning and ");" in the end. We need to strip these
+        // as well
+        const trimmedOutput = outputText.trim();
+        const configJsonObject = JSON.parse(trimmedOutput.substring(1, trimmedOutput.length - 2));
+        for (const diagnostic of diagnostics) {
+            diagnostic.start = diagnostic.start - 1;
+        }
+        return { configJsonObject, diagnostics };
+    }
 }