Build: Cannot use JSX unless the '--jsx' flag is provided
I added "jsx": "react" to my tsconfig.json to resolve this error:
{ "compileOnSave": true, "compilerOptions": { "target": "es6", "outFile": "Content/app.js", "sourceMap": true, "jsx": "react" }}
Adding this to the csproj worked for me in VS2015:
<PropertyGroup> <TypeScriptJSXEmit>react</TypeScriptJSXEmit></PropertyGroup>From: Working around "Cannot use JSX unless the '--jsx' flag is provided." using the TypeScript 1.6 beta
In your tsconfig.json add a property jsx with react value "jsx": "react". Second, you should also include the file to reflect the compiler options like this (index.tsx).
{ "compilerOptions": { "outDir": "./build/", "sourceMap": true, "noImplicitAny": true, "module": "commonjs", "target": "es5", "jsx": "react" }, "files": [ "./src/app/index.tsx" ]}