express-engine: the request of a dependency is an expression

[nweldev]

🐞 Bug report

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• xi18n
• run
• config
• help
• version
• doc

Is this a regression?

Bugs in Ng Universal v8 forbid to reproduce this issue.
Tested with several v9 versions, bug stays the same.

Description

With @nguniversal/express-engine, when using a third-party package server-side, running ng run <project>:server:production or ng run <project>:serve-ssr fails.

🔬 Minimal Reproduction

https://github.com/noelmace/ngu-repro-spdx

1. ng new reproduce
2. ng add @nguniversal/express-engine
3. npm i -d dd-trace graphql
4. add src/tracer.ts:

import tracer from 'dd-trace';
tracer.init();
export default tracer;

5. import src/tracer.ts in server.ts
6. npm run build:ssr

🔥 Exception or Error

WARNING in ./node_modules/dd-trace/packages/dd-trace/src/platform/node/loader.js 144:11-31
Critical dependency: the request of a dependency is an expression

ERROR in ./node_modules/spdx-expression-parse/scan.js
Module not found: Error: Can't resolve 'spdx-exceptions' in 'project/node_modules/spdx-expression-parse'

ERROR in ./node_modules/spdx-correct/index.js
Module not found: Error: Can't resolve 'spdx-license-ids' in 'project/node_modules/spdx-correct'

ERROR in ./node_modules/spdx-expression-parse/scan.js
Module not found: Error: Can't resolve 'spdx-license-ids' in 'project/node_modules/spdx-expression-parse'

ERROR in ./node_modules/spdx-expression-parse/scan.js
Module not found: Error: Can't resolve 'spdx-license-ids/deprecated' in 'project/node_modules/spdx-expression-parse'
this.debug is not a function

🌍 Your Environment

Angular CLI: 9.1.4
Node: 13.3.0
OS: linux x64

Angular: 9.1.4
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... platform-server, router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.901.4
@angular-devkit/build-angular     0.901.4
@angular-devkit/build-optimizer   0.901.4
@angular-devkit/build-webpack     0.901.4
@angular-devkit/core              9.1.4
@angular-devkit/schematics        9.1.4
@ngtools/webpack                  9.1.4
@nguniversal/builders             9.1.0
@nguniversal/common               9.1.0
@nguniversal/express-engine       9.1.0
@schematics/angular               9.1.4
@schematics/update                0.901.4
rxjs                              6.5.5
typescript                        3.8.3
webpack                           4.42.0

Anything else relevant?

$ npm list spdx-expression-parse      
[email protected]
└─┬ @angular/[email protected]
  └─┬ [email protected]
    └─┬ [email protected]
      └─┬ [email protected]
        ├─┬ [email protected]
        │ └── [email protected]  deduped
        └── [email protected] 

$ npm list spdx-exceptions                     
[email protected]
└─┬ @angular/[email protected]
  └─┬ [email protected]
    └─┬ [email protected]
      └─┬ [email protected]
        └─┬ [email protected]
          └── [email protected] 

$ npm list spdx-correct   
[email protected]
└─┬ @angular/[email protected]
  └─┬ [email protected]
    └─┬ [email protected]
      └─┬ [email protected]
        └── [email protected] 

$ npm list spdx-license-ids            
[email protected] /home/noel/git/_sandbox_/ngu-repro-spdx
└─┬ @angular/[email protected]
  └─┬ [email protected]
    └─┬ [email protected]
      └─┬ [email protected]
        ├─┬ [email protected]
        │ └── [email protected] 
        └─┬ [email protected]
          └── [email protected]  deduped

Pacote was added by @clydin via #13483 at https://github.com/angular/angular-cli/blame/9.1.x/packages/angular/cli/utilities/package-metadata.ts#L15 and downgraded in v10 by @alan-agius4 via #17358.

[alan-agius4]

The problem is caused by dd-trace because they have the below in their code

function getVersion (moduleBaseDir) {
  if (moduleBaseDir) {
    const packageJSON = `${moduleBaseDir}/package.json`
    return require(packageJSON).version
  }
}

Webpack is also warning about this

WARNING in ./node_modules/dd-trace/packages/dd-trace/src/platform/node/loader.js 144:11-31
Critical dependency: the request of a dependency is an expression

There are possible solutions;

1. Add dd-trace as an external dependency.

        "server": {
          "builder": "@angular-devkit/build-angular:server",
          "options": {
            "outputPath": "dist/ngu-repro-spdx/server",
            "main": "server.ts",
            "tsConfig": "tsconfig.server.json",
            "externalDependencies":["dd-trace"]
          },

2. Extend the webpack config using a third party builder and add the below plugin:

new webpack.ContextReplacementPlugin(/dd-trace(\\|\/)/),

See https://webpack.js.org/plugins/context-replacement-plugin/ for more info about this plugin.

[nweldev]

The first option works perfectly. Thx Alan!

[dandean]

The error here:

ERROR in ./node_modules/spdx-expression-parse/scan.js
Module not found: Error: Can't resolve 'spdx-exceptions' in 'project/node_modules/spdx-expression-parse'

is caused by the fact that the spdx-exceptions file is just a .json file. To resolve the issue you have to make sure your webpack config has ".json" in its resolve.config setting.

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