Error TS2677: TypeScript build failure in Angular application on Azure DevOps pipeline

An error is occurring only during the Npm@1 task on the DevOps pipeline, while the app builds without issues locally. The Angular CLI version is 8.3.29 and TypeScript version is 3.5.3.

The custom command being executed is:

run build:artifact

This command points to the following in package.json:

ng build --configuration=artifact

The error message thrown is as follows:

../node_modules/@types/lodash/common/lang.d.ts:577:74 - error TS2677: A type predicate's type must be assignable to its parameter's type.

Full log from the pipeline:

Starting: Angular Build
==============================================================================
Task         : npm
Description  : Install and publish npm packages, or run an npm command. Supports npmjs.com and authenticated registries like Azure Artifacts.
Version      : 1.202.0
Author       : Microsoft Corporation
Help         : https://learn.microsoft.com/azure/devops/pipelines/tasks/package/npm
==============================================================================
C:\Windows\system32\cmd.exe /D /S /C "C:\hostedtoolcache\windows\node\14.15.0\x64\npm.cmd --version"
6.14.8
C:\Windows\system32\cmd.exe /D /S /C "C:\hostedtoolcache\windows\node\14.15.0\x64\npm.cmd config list"
... (omitted for brevity)
...

Do you know how to track down where this error is being triggered?

When running the same command [

ng build --configuration=artifact
] manually on a local dev box with matching node\npm versions, no errors occur.

...
angulartypescriptazure-devopsazure-pipelineslodash

Answer №1

There has been a recent update that caused an issue with the package. The problem is being monitored on their Github page, but for now it's recommended to revert back to the previous version of @types/lodash which is 4.14.182.

Answer №2

During the process of updating npm-check from version 5.9.0 to 6.0.1, I encountered the same error.

If you come across this specific error message:

/node_modules/@types/lodash/common/lang.d.ts:577:74

It is likely caused by the @types/lodash package. To inspect the package's structure, use the following command:

npm list <package-name> npm list @types/lodash

The output displayed was as follows:

└─┬ [email protected] └─┬ [email protected] └── @types/[email protected]

This indicates that the issue stems from the update in npm-check version.

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