ng xi18n throws exception 'ERROR in Cannot read property 'loadChildren' of undefined' when route data contains an arrow expression

🐞 bug report

Is this a regression?

Reported on 10.0.0. This also happens in 9.x

Description

ng xi18n reports the following: ERROR in Cannot read property 'loadChildren' of undefined

🔬 Minimal Reproduction

https://github.com/rsivan/route-error

🔥 Exception or Error

> ng xi18n route-stuff --progress --output-path src/locale

ERROR in Cannot read property 'loadChildren' of undefined
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! route-stuff@0.0.0 xi18n: `ng xi18n route-stuff --progress --output-path src/locale`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the route-stuff@0.0.0 xi18n script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:

🌍 Your Environment

Angular Version:

Angular CLI: 10.0.0
Node: 13.12.0
OS: darwin x64

Angular: 10.0.0
... animations, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.1000.0
@angular-devkit/build-angular     0.1000.0
@angular-devkit/build-optimizer   0.1000.0
@angular-devkit/build-webpack     0.1000.0
@angular-devkit/core              10.0.0
@angular-devkit/schematics        10.0.0
@ngtools/webpack                  10.0.0
@schematics/angular               10.0.0
@schematics/update                0.1000.0
rxjs                              6.5.5
typescript                        3.9.5
webpack                           4.43.0

Anything else relevant?

The root cause appears to be using an arrow expression in a route definition. Note that the application compiles and runs correctly, just xi18n fails.

{ path: 'view1', component: View1Component, data: { permission: (r: any) => r.guide > 0 }},

removing the arrow expression fixes the issue.

[rsivan]

Verified fixed in 10.1.0-rc.0 using ng xi18n route-stuff --progress --output-path src/locale --ivy

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