Error after upgrading to SPFx 1.20.0

[kbeeveer46]

I ran my project with gulp serve and did not see these errors so I assume it's fast serve related? Just wanted to let you know there may need to be updates to it for the new SPFx version.

The errors below are referring to is this line on every web part file

import { Version } from '@microsoft/sp-core-library';

Which is needed for this code in the file

protected get dataVersion(): Version
    {
        return Version.parse('1.0');
    }

Errors:

Build target: DEBUG
[11:55:25] Using gulpfile C:\RespositoriesGit\CP\clientportalsharepoint\gulpfile.js
[11:55:25] Starting 'bundle'...
[11:55:25] Starting gulp
[11:55:25] Starting subtask 'pre-copy'...
[11:55:25] Finished subtask 'pre-copy' after 62 ms
[11:55:25] Starting subtask 'copy-static-assets'...
[11:55:25] Starting subtask 'sass'...
[11:55:26] Finished subtask 'sass' after 888 ms
[11:55:26] Starting subtask 'lint'...
[11:55:26] [lint] eslint version: 8.57.0
[11:55:26] Starting subtask 'tsc'...
[11:55:26] [tsc] typescript version: 4.7.4
[11:55:26] Finished subtask 'copy-static-assets' after 1.31 s
[11:55:42] Finished subtask 'lint' after 16 s
[11:55:51] Finished subtask 'tsc' after 25 s
[11:55:51] Starting subtask 'save-webpack-config'...
[11:55:51] Finished subtask 'save-webpack-config' after 970 μs
[11:55:51] Starting subtask 'post-copy'...
[11:55:51] Finished subtask 'post-copy' after 274 μs
[11:55:51] Starting subtask 'configure-webpack'...
[11:55:52] Finished subtask 'configure-webpack' after 552 ms
[11:55:52] Starting subtask 'webpack'...
[11:56:20] Error - [webpack] 'dist':
Did not find linked external "@microsoft/sp-core-library" for bundle "admin-manage-permissions-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "common-custom-reports-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "common-document-library-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "common-iframe-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "home-about-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "home-banner-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "home-documents-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "home-links-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "home-marketing-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "home-videos-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "home-page-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "pt-dashboard-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "pt-reports-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "pt-search-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "site-create-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "site-request-site-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "site-request-site-pending-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "site-select-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "tt-audit-tracker-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "tt-audit-and-recovery-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "tt-tax-rate-and-state-information-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "ttc-dashboard-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "ttc-carry-forward-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "ttc-compliance-summary-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "ttc-documents-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "ttc-filing-calendar-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "ttc-locations-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "ttc-notices-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "ttc-on-demand-reports-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "ttc-prepayment-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "ttc-rate-validation-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "ttc-tax-returns-web-part".

[11:56:20] Finished subtask 'webpack' after 28 s
[11:56:20] Finished 'bundle' after 55 s

[s-KaiNet]

If you run just gulp bundle, do you see any errors?

[kbeeveer46]

No errors with gulp bundle

[s-KaiNet]

but the errors you posted

[11:55:52] Starting subtask 'webpack'...
[11:56:20] Error - [webpack] 'dist':
Did not find linked external "@microsoft/sp-core-library" for bundle "admin-manage-permissions-web-part".
Did not find linked external "@microsoft/sp-core-library" for bundle "common-custom-reports-web-part".

Basically the errors from gulp bundle output.

[s-KaiNet]

wait, which version of spfx-fast-serve do you use? I haven't relelased 1.20 yet.

[kbeeveer46]

Latest version. So maybe this is expected. Just to confirm, should we always wait for the corresponding fast serve version to be released before we upgrade SPFx?

[s-KaiNet]

Yes, it's documented here, so you cannot run spfx-fast-serve-helpers@1.19 against a project based on SPFx 1.20. spfx-fast-serve-helpers@1.20 is not yet released, will do it on weekend.

[kbeeveer46]

Thanks! Will give it a try when it's released.