Safari Browser error

[rsach]

this is my package.json while using the 0.4.1 in safari , there's an error of "ReferenceError: Strict mode forbids implicit creation of global property 'MutationObserver'
i've encountered this error only in safari, not in any other webkit browser
"

"dependencies": { "@angular/common": "~2.4.5", "@angular/compiler": "~2.4.5", "@angular/core": "~2.4.5", "@angular/forms": "~2.4.5", "@angular/http": "~2.4.5", "@angular/material": "^2.0.0-beta.1", "@angular/platform-browser": "~2.4.5", "@angular/platform-browser-dynamic": "~2.4.5", "@angular/router": "~3.4.5", "angular2-cookie": "^1.2.6", "angular2-masonry": "^0.3.1", "angular2-moment": "^1.1.0", "core-js": "^2.4.1", "ng2-page-scroll": "^4.0.0-beta.1", "ng2-slim-loading-bar": "^2.0.7", "rxjs": "5.1.0", "ts-helpers": "^1.1.1", "zone.js": "^0.7.6" }, "devDependencies": { "@angular/compiler-cli": "^2.3.1", "@types/jasmine": "2.5.38", "@types/node": "^6.0.42", "angular-cli": "1.0.0-beta.24", "codelyzer": "~2.0.0-beta.1", "jasmine-core": "2.5.2", "jasmine-spec-reporter": "2.5.0", "karma": "1.2.0", "karma-chrome-launcher": "^2.0.0", "karma-cli": "^1.0.1", "karma-jasmine": "^1.0.2", "karma-remap-istanbul": "^0.2.1", "protractor": "~4.0.13", "ts-node": "1.2.1", "tslint": "^4.0.2", "typescript": "~2.0.3" }