self.postMessage is not a function

I just installed it and it gives me that error.

Version i'm using:

"@angular/common": "5.2.5",
"@angular/compiler": "5.2.5",
"@angular/core": "5.2.5",
"@angular/forms": "5.2.5",
"@angular/http": "5.2.5",
"@angular/platform-browser": "5.2.5",
"@angular/platform-browser-dynamic": "5.2.5",
"@angular/router": "5.2.5",
"@angular/animations": "5.2.5",
"@types/geojson": "1.0.4",
"@types/proj4": "^2.3.4",
"ajv": "6.1.1",
"angular-in-memory-web-api": "0.5.3",
"core-js": "2.5.1",
"devextreme": "17.2.5",
"devextreme-angular": "17.2.5",
"enhanced-resolve": "3.3.0",
"jszip": "3.1.4",
"proj4": "^2.4.4",
"reflect-metadata": "0.1.10",
"rxjs": "5.5.6",
"ts-helpers": "1.1.2",
"wellknown": "0.5.0",
"zone.js": "0.8.14"

leaflet.omnivore: v0.3.1


The issue names no source file, test, or entry point. Start by reproducing the error with Angular 5.2.5 and leaflet.omnivore 0.3.1, then trace where self.postMessage is called in the integration. Done means identifying a reproducible cause and confirming a compatible fix or documenting the incompatibility.

Written by the indexing model from the issue text.