AOT build error Cannot read property 'kind' of undefined

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Versions.

Angular CLI: 1.5.0 Node: 8.5.0 OS: darwin x64 Angular: 5.0.1 … animations, common, compiler, compiler-cli, core, forms … http, language-service, platform-browser … platform-browser-dynamic, router

@angular/cdk: 5.0.0-rc0 @angular/cli: 1.5.0 @angular/flex-layout: 2.0.0-beta.10-4905443 @angular/material: 5.0.0-rc0 @angular-devkit/build-optimizer: 0.0.32 @angular-devkit/core: 0.0.20 @angular-devkit/schematics: 0.0.35 @ngtools/json-schema: 1.1.0 @ngtools/webpack: 1.8.0 @schematics/angular: 0.1.2 typescript: 2.4.2 webpack-bundle-analyzer: 2.9.1 webpack: 3.8.1

Repro steps.

rm -rf node_modules/ yarn add @angular/cli@latest -D ng build --aot

The log given by the failure.

ERROR in Error: TypeError: Cannot read property 'kind' of undefined at nodeCanBeDecorated (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:7805:35) at nodeIsDecorated (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:7825:16) at Object.nodeOrChildIsDecorated (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:7829:16) at isDecoratedClassElement (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:51668:23) at isInstanceDecoratedClassElement (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:51659:20) at Object.filter (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:1652:25) at getDecoratedClassElements (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:51641:23) at generateClassElementDecorationExpressions (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:51815:27) at addClassElementDecorationStatements (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:51804:44) at visitClassDeclaration (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:51131:13) at visitTypeScript (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:50972:28) at visitorWorker (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:50785:24) at sourceElementVisitorWorker (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:50817:28) at saveStateAndInvoke (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:50738:27) at sourceElementVisitor (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:50799:20) at visitNodes (/Users/sam/Developer/ng-prime/node_modules/typescript/lib/typescript.js:49280:48)

Desired functionality.

AOT build should be successful

Mention any other details that might be useful.

The project built fine with AOT enabled with CLI v1.4.9

[samalexander]

@Axure it builds successfully for me with ng build --prod --aot=false

[ericmarcos]

I’m having the same problem and found it’s because of arrow functions in decorators, like:

@Type(() => Message)

When I change the above to:

function m() { return Message; }
@Type(m)

It compiles with AOT again =)