MatTree can not be created in es6

[zonkhonk]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Should work in es6

What is the current behavior?

Throw following error

ERROR TypeError: Cannot read property 'find' of undefined
at MatTree.ngOnInit (tree.js:484)
at checkAndUpdateDirectiveInline (core.js:11866)
at checkAndUpdateNodeInline (core.js:13394)
at checkAndUpdateNode (core.js:13337)
at debugCheckAndUpdateNode (core.js:14246)
at debugCheckDirectivesFn (core.js:14191)
at Object.eval [as updateDirectives] (TreeCheckListComponent.html:1)
at Object.debugUpdateDirectives [as updateDirectives] (core.js:14180)
at checkAndUpdateView (core.js:13303)
at callViewAction (core.js:13654)

What are the steps to reproduce?

use an example from angular/material
(https://material.angular.io/components/tree/examples)
and change the compiler target to "es6" in tsconfig.json

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

"dependencies": {
"@angular/animations": "^6.0.3",
"@angular/cdk": "^6.2.0",
"@angular/common": "^6.0.3",
"@angular/compiler": "^6.0.3",
"@angular/core": "^6.0.3",
"@angular/forms": "^6.0.3",
"@angular/http": "^6.0.3",
"@angular/material": "^6.2.0",
"@angular/platform-browser": "^6.0.3",
"@angular/platform-browser-dynamic": "^6.0.3",
"@angular/router": "^6.0.3",
"core-js": "^2.5.4",
"rxjs": "^6.0.0",
"zone.js": "^0.8.26"
},
"devDependencies": {
"@angular/compiler-cli": "^6.0.3",
"@angular-devkit/build-angular": "~0.6.5",
"typescript": "~2.7.2",
"@angular/cli": "~6.0.5",
"@angular/language-service": "^6.0.3",
"@types/jasmine": "~2.8.6",
"@types/jasminewd2": "~2.0.3",
"@types/node": "~8.9.4",
"codelyzer": "~4.2.1",
"jasmine-core": "~2.99.1",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~1.7.1",
"karma-chrome-launcher": "~2.2.0",
"karma-coverage-istanbul-reporter": "~1.4.2",
"karma-jasmine": "~1.1.1",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.3.0",
"ts-node": "~5.0.1",
"tslint": "~5.9.1"
}

Is there anything else we should know?

the "_differs" constructor parameter of CdkTree is "undefined" at runtime

[amreshprasad]

I am facing this as well. Had the tree working under es5, but switched the target to es6 and started getting this error.

[chipallen2]

Getting this as well. I upgraded to the latest 6.3.0 version but it still happens in there too.

[Talador12]

I am facing this as well. Had the tree working under es5, but switched the target to es6 and started getting this error.

Same here.

es6, es2017, and es2018 all do not work. This is a serious issue.

@tinayuangao @josephperrott any thoughts?

[liunan]

This can works in production mode

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