Line 1, col 1: 'const' is available in ES6 (use 'esversion: 6') or Mozilla JS extensions (use moz).
Line 2, col 1: 'let' is available in ES6 (use 'esversion: 6') or Mozilla JS extensions (use moz).
Line 7, col 8: 'let' is available in ES6 (use 'esversion: 6') or Mozilla JS extensions (use moz).
Line 1, col 1: 'const' is available in ES6 (use 'esversion: 6') or Mozilla JS extensions (use moz). Line 2, col 1: 'let' is available in ES6 (use 'esversion: 6') or Mozilla JS extensions (use moz). Line 7, col 8: 'let' is available in ES6 (use 'esversion: 6') or Mozilla JS extensions (use moz).