Error: [CORE - LIT-STATIC-PROPERTIES]: Looks like you've hit an error in the core library.

[domoskanonos]

NPM command: custom-elements-manifest analyze --outdir public/ --litelement --dev

with node version 14.17.0 everything works fine, version 16.14.2 broken with error:

TypeError: Cannot read properties of undefined (reading 'push')
at mapClassMember (file:///C:/machineroom/git/ui-blueprint-webcomponent/blueprint-frontend/node_modules/@custom-elements-manifest/analyzer/src/features/analyse-phase/creators/createClass.js:242:27)
at file:///C:/machineroom/git/ui-blueprint-webcomponent/blueprint-frontend/node_modules/@custom-elements-manifest/analyzer/src/features/analyse-phase/creators/createClass.js:211:35
at Array.forEach ()
at visitNode (file:///C:/machineroom/git/ui-blueprint-webcomponent/blueprint-frontend/node_modules/@custom-elements-manifest/analyzer/src/features/analyse-phase/creators/createClass.js:211:12)
at visitNodes (C:\machineroom\git\ui-blueprint-webcomponent\blueprint-frontend\node_modules@custom-elements-manifest\analyzer\node_modules\typescript\lib\typescript.js:29004:30)
at Object.forEachChild (C:\machineroom\git\ui-blueprint-webcomponent\blueprint-frontend\node_modules@custom-elements-manifest\analyzer\node_modules\typescript\lib\typescript.js:29316:21)
at visitNode (file:///C:/machineroom/git/ui-blueprint-webcomponent/blueprint-frontend/node_modules/@custom-elements-manifest/analyzer/src/features/analyse-phase/creators/createClass.js:216:8)
at getDefaultValuesFromConstructorVisitor (file:///C:/machineroom/git/ui-blueprint-webcomponent/blueprint-frontend/node_modules/@custom-elements-manifest/analyzer/src/features/analyse-phase/creators/createClass.js:200:3)
at analyzePhase (file:///C:/machineroom/git/ui-blueprint-webcomponent/blueprint-frontend/node_modules/@custom-elements-manifest/analyzer/src/features/framework-plugins/lit/static-properties.js:75:11)
at file:///C:/machineroom/git/ui-blueprint-webcomponent/blueprint-frontend/node_modules/@custom-elements-manifest/analyzer/src/create.js:104:23

at withErrorHandling (file:///C:/machineroom/git/ui-blueprint-webcomponent/blueprint-frontend/node_modules/@custom-elements-manifest/analyzer/src/utils/index.js:67:11)
at file:///C:/machineroom/git/ui-blueprint-webcomponent/blueprint-frontend/node_modules/@custom-elements-manifest/analyzer/src/create.js:103:7
at Array.forEach (<anonymous>)
at visitNode (file:///C:/machineroom/git/ui-blueprint-webcomponent/blueprint-frontend/node_modules/@custom-elements-manifest/analyzer/src/create.js:102:19)
at visitNodes (C:\machineroom\git\ui-blueprint-webcomponent\blueprint-frontend\node_modules\@custom-elements-manifest\analyzer\node_modules\typescript\lib\typescript.js:29004:30)
at Object.forEachChild (C:\machineroom\git\ui-blueprint-webcomponent\blueprint-frontend\node_modules\@custom-elements-manifest\analyzer\node_modules\typescript\lib\typescript.js:29241:24)
at visitNode (file:///C:/machineroom/git/ui-blueprint-webcomponent/blueprint-frontend/node_modules/@custom-elements-manifest/analyzer/src/create.js:108:8)
at visitNode (C:\machineroom\git\ui-blueprint-webcomponent\blueprint-frontend\node_modules\@custom-elements-manifest\analyzer\node_modules\typescript\lib\typescript.js:28995:24)
at Object.forEachChild (C:\machineroom\git\ui-blueprint-webcomponent\blueprint-frontend\node_modules\@custom-elements-manifest\analyzer\node_modules\typescript\lib\typescript.js:29125:21)
at visitNode (file:///C:/machineroom/git/ui-blueprint-webcomponent/blueprint-frontend/node_modules/@custom-elements-manifest/analyzer/src/create.js:108:8)

[thepassle]

could you post some reproduction code please? :)

Seems like currClass

custom-elements-manifest/packages/analyzer/src/features/framework-plugins/lit/static-properties.js

Line 75 in e5eca5b

getDefaultValuesFromConstructorVisitor(node, currClass, context);

which we get from here

custom-elements-manifest/packages/analyzer/src/features/framework-plugins/lit/static-properties.js

Line 18 in e5eca5b

const currClass = moduleDoc?.declarations?.find(declaration => declaration.name === className);

is not found for some reason, gotta figure out why, but need some reproduction code/playground url to be able to investigate

Not sure why different node versions would have anything to do with it though, we don't really do anything exotic in that regard.

[domoskanonos]

import {LitElement, TemplateResult, html} from "lit";
import {customElement, property} from "lit/decorators.js";
import {environment} from "../environments/environment";
import {OpenidService} from "../service/openid-service";

@CustomElement("si-ui-blueprint-webcomponent")
export class SiUiBlueprintWebcomponent extends LitElement {

@property({type: String})
status: string = "success";

public render(): TemplateResult {
    return html`Something to render `;
}

private login(): void {
    
}

private newListItem(text: string) {
    return html`
       something`;
}

}

[domoskanonos]

lit version is: "lit": "2.2.1",

[thepassle]

Im not able to reproduce locally or in the playground

Do note that you're importing

import {customElement, property} from "lit/decorators.js";

but using it with a capital:

@CustomElement("si-ui-blueprint-webcomponent")

[domoskanonos]

@CustomElement -> git automatically capitalized it

[domoskanonos]

in my code it's lowercase "c"

[domoskanonos]

ok i will try to find out where the problem is and i will report here. If i remove "--litElement" flag it works...

[domoskanonos]

exact environment : node: v16.14.2, npm: 8.5.0

[valentindiehl]

@domoskanonos Have you found a solution for this? I'm having the same issue, but I'm trying for days to find the source since it randomly appeared without really changing or updating anything.

As soon as I find a minimal example without 300 lines of code, I'll post it here.

[valentindiehl]

To add to this: The error already happens when running "npm install", not even while transpiling with run/build

[DeepakJY97SF]

I fixed this issue in the createClass.js by checking for classTemplate.members existence and initialize it with empty array if undefined

old:

  if (!existingMember) {
    if (hasIgnoreJSDoc(statement)) return;
    if (isBindCall(statement)) return;

    existingMember = {
      kind: 'field',
      name: expression?.left?.name?.getText(),
    }
    classTemplate.members.push(existingMember);
  }

new:

  if (!existingMember) {
    if (hasIgnoreJSDoc(statement)) return;
    if (isBindCall(statement)) return;

    existingMember = {
      kind: 'field',
      name: expression?.left?.name?.getText(),
    }
    if(!classTemplate.members){
      classTemplate.members = [];
    }
    classTemplate.members.push(existingMember);
  }

I tried to push a fix branch to create a pullrequest, but I don't have the rights

[KameronKales]

I had this issue (independent of which node version I was running, i tried 14 and 16).

Version: "@custom-elements-manifest/analyzer": "^0.6.4"

I was able to fix by being verify specific about what code to include via --glob.

For a project im working on

This works:

cem analyze --litelement --globs packages/*/* --exclude packages/*/dist

This does not

cem analyze --litelement --exclude packages/*/dist

and this does not

cem analyze --litelement --globs packages/*/*

Obviously YMMV but changing this command got me up and running again. Im assuming there is some code in my project that is causing the issue and I should have been using globs all along