reachable
Error: an exception
    at branch (*typescript-throw.js:20:15)
        -> *typescript-throw.ts:18:11
    at Object.<anonymous> (*typescript-throw.js:26:1)
        -> *typescript-throw.ts:24:1
    at Module._compile (internal/modules/cjs/loader.js:*)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:*)
    at Module.load (internal/modules/cjs/loader.js:*)
    at Function.Module._load (internal/modules/cjs/loader.js:*)
    at Module.require (internal/modules/cjs/loader.js:*)
    at require (internal/modules/cjs/helpers.js:*)
    at Object.<anonymous> (*source_map_throw_first_tick.js:5:1)
    at Module._compile (internal/modules/cjs/loader.js:*)