Prepack: This operation is not yet supported on abstract value __IntrospectionError

[obenjiro]

Trying to use prepack for angular 4 app. Using angular/cli. Simple hello world. I can provide full source if necessary.

This operation is not yet supported on abstract value
__IntrospectionError
    at concat.12312312312.bundle.js:2622:67
    at R3AP (unknown)
    at call (native)
    at r (concat.12312312312.bundle.js:9:12)
    at Ds5P (concat.12312312312.bundle.js:460:11)
    at call (native)
    at r (concat.12312312312.bundle.js:9:12)
    at CVR+ (concat.12312312312.bundle.js:354:13)
    at call (native)
    at r (concat.12312312312.bundle.js:9:12)
    at 2tFN (concat.12312312312.bundle.js:192:5)
    at call (native)
    at r (concat.12312312312.bundle.js:9:12)
    at XS25 (concat.12312312312.bundle.js:900:13)
    at call (native)
    at r (concat.12312312312.bundle.js:9:12)
    at 1 (concat.12312312312.bundle.js:132:17)
    at call (native)
    at r (concat.12312312312.bundle.js:9:12)
    at concat.12312312312.bundle.js:17:42
    at concat.12312312312.bundle.js:66:1

  ulTY: function (t, e) {
    var n = 0,
      r = Math.random();
    t.exports = function (t) {
      return "Symbol(".concat(void 0 === t ? "" : t, ")_", (++n + r).toString(36))   <-- HERE 2622
    }
  },

[sebmarkbage]

That looks like it is use Math.random. You will need to provide the option mathRandomSeed to let Prepack know that it is ok to encode random values into the output.

https://github.com/facebook/prepack/blob/master/src/options.js#L20

[obenjiro]

@sebmarkbage Tnx a lot. mathRandomSeed helps

PS: maybe you can help, I have other problem right now (maybe i'm missing something again)

XMLHttpRequest is not defined

[sebmarkbage]

That's because the full DOM API isn't modeled yet. You'll have to manually stub out all the DOM APIs that you rely on. Prepack doesn't know about those things automatically yet. Follow https://github.com/facebook/prepack/issues/24 to see when that's implemented.

[gre]

I've tried the mathRandomSeed and still get the same error. Would be great if the error message was telling which abstract value it failed on (like saying it's Math.random)