More robust handling of invalid script values

extensions/npm/src/commands.ts

@@ -26,7 +26,7 @@ export function runSelectedScript() {
 	if (script) {
 		runScript(script, document);
 	} else {
-		let message = localize('noScriptFound', 'Could not find an npm script at the selection.');
+		let message = localize('noScriptFound', 'Could not find a valid npm script at the selection.');
 		vscode.window.showErrorMessage(message);
 	}
 }
\ No newline at end of file

extensions/npm/src/tasks.ts

@@ -361,7 +361,9 @@ async function findAllScripts(buffer: string): Promise<StringMap> {
 		},
 		onLiteralValue(value: any, _offset: number, _length: number) {
 			if (script) {
-				scripts[script] = value;
+				if (typeof value === 'string') {
+					scripts[script] = value;
+				}
 				script = undefined;
 			}
 		},
@@ -419,6 +421,7 @@ export function findAllScriptRanges(buffer: string): Map<string, [number, number
 
 export function findScriptAtPosition(buffer: string, offset: number): string | undefined {
 	let script: string | undefined = undefined;
+	let foundScript: string | undefined = undefined;
 	let inScripts = false;
 	let scriptStart: number | undefined;
 	let visitor: JSONVisitor = {
@@ -432,9 +435,10 @@ export function findScriptAtPosition(buffer: string, offset: number): string | u
 		},
 		onLiteralValue(value: any, nodeOffset: number, nodeLength: number) {
 			if (inScripts && scriptStart) {
-				if (offset >= scriptStart && offset < nodeOffset + nodeLength) {
+				if (typeof value === 'string' && offset >= scriptStart && offset < nodeOffset + nodeLength) {
 					// found the script
 					inScripts = false;
+					foundScript = script;
 				} else {
 					script = undefined;
 				}
@@ -447,11 +451,13 @@ export function findScriptAtPosition(buffer: string, offset: number): string | u
 			else if (inScripts) {
 				scriptStart = nodeOffset;
 				script = property;
+			} else { // nested object which is invalid, ignore the script 
+				script = undefined;
 			}
 		}
 	};
 	visit(buffer, visitor);
-	return script;
+	return foundScript;
 }
 
 export async function getScripts(packageJsonUri: Uri): Promise<StringMap | undefined> {