assert: filename may be undefined in `filename.endsWith('.js')`

[jeysal]

• Version: v10.1.0
• Platform: Linux arch-seckinger 4.16.9-1-ARCH deps: update openssl to 1.0.1j #1 SMP PREEMPT Thu May 17 02:10:09 UTC 2018 x86_64 GNU/Linux
• Subsystem: assert

Apparently introduced by #18322.
I'm working on a PR to fix this.

code

new Function("assert", "assert(1 === 2);")(require("assert"));

expected behavior

(this is what happens with node 6, 7, 8 and 9)
throws an AssertionError: false == true

actual behavior

(with node 10)
throws

assert.js:163
  if (filename.endsWith('.js') && NativeModule.exists(filename.slice(0, -3))) {
               ^

TypeError: Cannot read property 'endsWith' of undefined