Report error if commanline only option is specified in tsconfig

src/compiler/commandLineParser.ts

@@ -3169,6 +3169,7 @@ function getExtendsConfigPathOrArray(
     basePath: string,
     configFileName: string | undefined,
     errors: Diagnostic[],
+    propertyAssignment?: PropertyAssignment,
     valueExpression?: Expression,
     sourceFile?: JsonSourceFile,
 ) {
@@ -3199,12 +3200,12 @@ function getExtendsConfigPathOrArray(
                 ));
             }
             else {
-                convertJsonOption(extendsOptionDeclaration.element, value, basePath, errors, (valueExpression as ArrayLiteralExpression | undefined)?.elements[index], sourceFile);
+                convertJsonOption(extendsOptionDeclaration.element, value, basePath, errors, propertyAssignment, (valueExpression as ArrayLiteralExpression | undefined)?.elements[index], sourceFile);
             }
         }
     }
     else {
-        convertJsonOption(extendsOptionDeclaration, value, basePath, errors, valueExpression, sourceFile);
+        convertJsonOption(extendsOptionDeclaration, value, basePath, errors, propertyAssignment, valueExpression, sourceFile);
     }
     return extendedConfigPath;
 }
@@ -3247,7 +3248,7 @@ function parseOwnConfigOfJsonSourceFile(
         option: CommandLineOption | undefined,
     ) {
         // Ensure value is verified except for extends which is handled in its own way for error reporting
-        if (option && option !== extendsOptionDeclaration) value = convertJsonOption(option, value, basePath, errors, propertyAssignment.initializer, sourceFile);
+        if (option && option !== extendsOptionDeclaration) value = convertJsonOption(option, value, basePath, errors, propertyAssignment, propertyAssignment.initializer, sourceFile);
         if (parentOption?.name) {
             if (option) {
                 let currentOption;
@@ -3274,7 +3275,7 @@ function parseOwnConfigOfJsonSourceFile(
         }
         else if (parentOption === rootOptions) {
             if (option === extendsOptionDeclaration) {
-                extendedConfigPath = getExtendsConfigPathOrArray(value, host, basePath, configFileName, errors, propertyAssignment.initializer, sourceFile);
+                extendedConfigPath = getExtendsConfigPathOrArray(value, host, basePath, configFileName, errors, propertyAssignment, propertyAssignment.initializer, sourceFile);
             }
             else if (!option) {
                 if (keyText === "excludes") {
@@ -3457,18 +3458,23 @@ export function convertJsonOption(
     value: any,
     basePath: string,
     errors: Diagnostic[],
+    propertyAssignment?: PropertyAssignment,
     valueExpression?: Expression,
     sourceFile?: TsConfigSourceFile,
 ): CompilerOptionsValue {
+    if (opt.isCommandLineOnly) {
+        errors.push(createDiagnosticForNodeInSourceFileOrCompilerDiagnostic(sourceFile, propertyAssignment?.name, Diagnostics.Option_0_can_only_be_specified_on_command_line, opt.name));
+        return undefined;
+    }
     if (isCompilerOptionsValue(opt, value)) {
         const optType = opt.type;
         if ((optType === "list") && isArray(value)) {
-            return convertJsonOptionOfListType(opt, value, basePath, errors, valueExpression as ArrayLiteralExpression | undefined, sourceFile);
+            return convertJsonOptionOfListType(opt, value, basePath, errors, propertyAssignment, valueExpression as ArrayLiteralExpression | undefined, sourceFile);
         }
         else if (optType === "listOrElement") {
             return isArray(value) ?
-                convertJsonOptionOfListType(opt, value, basePath, errors, valueExpression as ArrayLiteralExpression | undefined, sourceFile) :
-                convertJsonOption(opt.element, value, basePath, errors, valueExpression, sourceFile);
+                convertJsonOptionOfListType(opt, value, basePath, errors, propertyAssignment, valueExpression as ArrayLiteralExpression | undefined, sourceFile) :
+                convertJsonOption(opt.element, value, basePath, errors, propertyAssignment, valueExpression, sourceFile);
         }
         else if (!isString(opt.type)) {
             return convertJsonOptionOfCustomType(opt as CommandLineOptionOfCustomType, value as string, errors, valueExpression, sourceFile);
@@ -3529,10 +3535,11 @@ function convertJsonOptionOfListType(
     values: readonly any[],
     basePath: string,
     errors: Diagnostic[],
+    propertyAssignment: PropertyAssignment | undefined,
     valueExpression: ArrayLiteralExpression | undefined,
     sourceFile: TsConfigSourceFile | undefined,
 ): any[] {
-    return filter(map(values, (v, index) => convertJsonOption(option.element, v, basePath, errors, valueExpression?.elements[index], sourceFile)), v => option.listPreserveFalsyValues ? true : !!v);
+    return filter(map(values, (v, index) => convertJsonOption(option.element, v, basePath, errors, propertyAssignment, valueExpression?.elements[index], sourceFile)), v => option.listPreserveFalsyValues ? true : !!v);
 }
 
 /**

src/compiler/diagnosticMessages.json

@@ -5270,6 +5270,10 @@
         "category": "Message",
         "code": 6265
     },
+    "Option '{0}' can only be specified on command line.": {
+        "category": "Error",
+        "code": 6266
+    },
 
     "Directory '{0}' has no containing package.json scope. Imports will not resolve.": {
         "category": "Message",

src/testRunner/unittests/config/tsconfigParsing.ts

@@ -342,6 +342,17 @@ describe("unittests:: config:: tsconfigParsing:: parseConfigFileTextToJson", ()
         allFileList: ["/apath/a.ts"],
     }]);
 
+    baselinedParsed("generates errors when commandline option is in tsconfig", () => [{
+        jsonText: JSON.stringify({
+            compilerOptions: {
+                help: true,
+            }
+        }),
+        configFileName: "/apath/tsconfig.json",
+        basePath: "tests/cases/unittests",
+        allFileList: ["/apath/a.ts"],
+    }]);
+
     function baselineWildcards(subScenario: string, scenario: () => { configFileName: string, jsonText: string, basePath: string }[]) {
         baselineParseConfig({
             scenario: "tsconfigParsing",

tests/baselines/reference/config/tsconfigParsing/generates errors when commandline option is in tsconfig with json api.js

@@ -0,0 +1,14 @@
+Fs::
+//// [/apath/a.ts]
+
+
+//// [/apath/tsconfig.json]
+{"compilerOptions":{"help":true}}
+
+
+configFileName:: /apath/tsconfig.json
+FileNames::
+/apath/a.ts
+Errors::
+error TS6266: Option 'help' can only be specified on command line.
+

tests/baselines/reference/config/tsconfigParsing/generates errors when commandline option is in tsconfig with jsonSourceFile api.js

@@ -0,0 +1,17 @@
+Fs::
+//// [/apath/a.ts]
+
+
+//// [/apath/tsconfig.json]
+{"compilerOptions":{"help":true}}
+
+
+configFileName:: /apath/tsconfig.json
+FileNames::
+/apath/a.ts
+Errors::
+/apath/tsconfig.json:1:21 - error TS6266: Option 'help' can only be specified on command line.
+
+1 {"compilerOptions":{"help":true}}
+                      ~~~~~~
+