Cannot find module './applySourceMap' on ng serve or ng build

[blakeghowe]

🐞 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?

Unsure

Description

If I use ng serve or ng build, I get the following error message:
An unhandled exception occurred: Cannot find module './applySourceMap' See "C:\Users\[USER]\AppData\Local\Temp\ng-aEMkei\angular-errors.log" for further details.

🔬 Minimal Reproduction

🔥 Exception or Error

[error] Error: Cannot find module './applySourceMap'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:582:15)
    at Function.Module._load (internal/modules/cjs/loader.js:508:25)
    at Module.require (internal/modules/cjs/loader.js:637:17)
    at require (internal/modules/cjs/helpers.js:22:18)
    at Object. (C:\Users\[USER]\source\repos\[PROJECT]\Angular_nstt\node_modules\webpack-sources\lib\SourceMapSource.js:13:22)
    at Module._compile (internal/modules/cjs/loader.js:701:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
    at Module.load (internal/modules/cjs/loader.js:600:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
    at Function.Module._load (internal/modules/cjs/loader.js:531:3)

🌍 Your Environment

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.801.0
@angular-devkit/build-angular     0.803.21
@angular-devkit/build-optimizer   0.803.21
@angular-devkit/build-webpack     0.803.21
@angular-devkit/core              8.1.0
@angular-devkit/schematics        8.1.0
@angular/animations               8.1.3
@angular/cdk                      8.1.1
@angular/http                     2.3.0
@angular/material                 8.1.2
@angular/platform-browser         8.1.3
@angular/tsc-wrapped              0.4.2
@ngtools/webpack                  8.3.21
@schematics/angular               8.1.0
@schematics/update                0.801.0
rxjs                              6.5.2
typescript                        3.4.5
webpack                           4.39.2

Anything else relevant?

[sacgrover]

Seems like. You didn't import applySourceMap module into App Module

[alan-agius4]

Hi @blakeghowe, this might be caused by a package manger hosting issue. I am seeing also a number of package versions which are not aligned.

Can you update your @angular/cli version to ^8.3.21 and try again?

[philoj]

@alan-agius4 Having same issue here. I updated the cli to 8.3.21, still having the issue
@blakeghowe did you find a solution?

[alan-agius4]

Can you run npm ls webpack-sources?

[frontend-stunntech]

Can you run npm ls webpack-sources?

Hi @alan-agius4 ,
I get the following
└─┬ @angular-devkit/[email protected]
├─┬ @angular-devkit/[email protected]
│ └── [email protected] deduped
├─┬ @ngtools/[email protected]
│ └── [email protected] deduped
├─┬ [email protected]
│ └── [email protected] deduped
├─┬ [email protected]
│ └── [email protected] deduped
├─┬ [email protected]
│ └── [email protected] deduped
├─┬ [email protected]
│ └── [email protected] deduped
└── [email protected]

[clydin]

You may have a corrupted install. The JavaScript file in question (applySourceMap.js) should be located adjacent to the SourceMapSource.js mentioned in the stack trace. (package contents)

Can you check whether the file applySourceMap.js is present in the node_modules\webpack-sources\lib\ directory?
Also it may be useful to try deleting the node_modules directory and lock file and then re-installing. If the problem persists, removing the local npm cache prior to the re-install may help (npm cache clean --force).

[frontend-stunntech]

You may have a corrupted install. The JavaScript file in question (applySourceMap.js) should be located adjacent to the SourceMapSource.js mentioned in the stack trace. (package contents)

Can you check whether the file applySourceMap.js is present in the node_modules\webpack-sources\lib\ directory?
Also it may be useful to try deleting the node_modules directory and lock file and then re-installing. If the problem persists, removing the local npm cache prior to the re-install may help (npm cache clean --force).

Thanks, @clydin,
applySourceMap.js was missing in the directory node_modules\webpack-sources\lib\.
Now its working fine when deleting `node-modules' and lock file and then reinstalling

[filipesilva]

Glad to hear it's sorted, I'll close the issue then.

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