[EDITION] ReferenceError in EditionGraphModule about awg-app HOT 4 CLOSED

First guess: Circular dependencies (in regard to other issues reported on the web: https://stackoverflow.com/questions/60122727/referenceerror-cannot-access-player-before-initialization)

No, there are no circular dependencies in the EditionGraphModule according to analysis with madge:

madge --circular src/app/views/edition-view/edition-outlets/edition-graph/**.ts

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Tracked it down to N3. Removing the N3 import in the GraphVisualizerService, removes the error. But this is not a solution, since N3 is needed to parse the RDF input.

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After a long search, the issue seems to be related to the import of old stream package by N3. Replacing the stream imports with imports from readable-stream solves the issue. Manual changes in the following files of N3 node module package are necessary:

node_modules/N3/src/N3StreamParser.js  
                --> import { Transform } from 'readable-stream';

node_modules/N3/src/N3StreamWriter.js 
                --> import { Transform } from 'readable-stream';

node_modules/N3/src/N3Store.js
                --> import { Readable } from 'readable-stream';

Cf. DevExpress/devextreme-angular#776 (comment)

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Necessary steps:

1. Add window globals in polyfills.ts
2. Install @types/node as DevDependencies and add "node" to the types in tsconfig.{app/spec}.json
3. Add readable-stream to the allowedCommonJsDependencies option in angular.json
4. Manually change the N3 files that use imports from stream as explained above
5. Import N3 in GraphService as follows: import * as N3 from 'n3'

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