SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode

    at exports.runInThisContext (vm.js:53:16)

    at Module._compile (module.js:373:25)

    at Object.Module._extensions..js (module.js:416:10)

    at Module.load (module.js:343:32)

    at Function.Module._load (module.js:300:12)

    at Module.require (module.js:353:17)

    at require (internal/module.js:12:17)

    at Object.<anonymous> (/Users/srinivasnidadavolu/Downloads/testapp/app.js:42:20)

    at Module._compile (module.js:409:26)

    at Object.Module._extensions..js (module.js:416:10)

    at Module.load (module.js:343:32)

    at Function.Module._load (module.js:300:12)

    at Function.Module.runMain (module.js:441:10)

    at startup (node.js:139:18)

    at node.js:974:3

solution:

Declare strict mode at the beginning of the function or constant to use Block-scoped declarations.

"use strict"