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`externalPackagesPlugin` slows down `ng serve` substantially

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@clydin 已经在做这个了。

开始于 2025年7月7日。

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描述

angular/build:application angular/build:dev-server area: @angular/build freq1: low needs: more info severity4: memory/performance type: bug/fix
Command

serve

Is this a regression?
The previous version in which this bug was not present was

Before https://github.com/angular/angular-cli/pull/26923 existed, which was part of 17.1.1, so I guess angular 17.1.0

Description

angular 17.2.0
vite/esbuild powered application builder

Using the loader option in angular.json like:

"loader": { ".webp": "file", ".svg": "text" },

to support images as ecmascript imports or svgs as inline. This causes angular-cli to add the externalPackagesPlugin which is a giant hit on build performance. For our apps:

angular version watch rebuild time note
angular 17.1.0 { "loader": { ".webp": "file" } } 0.8 seconds
angular 17.1.1 { "loader": { ".webp": "file" } } 6.0 seconds
angular 17.2.0 { "loader": { ".webp": "file" } } 6.0 seconds
angular 19.2.1 { "loader": { ".webp": "file" } } 0.8 seconds <- file doesn't regress anymore
angular 19.2.1 { "loader": { ".svg": "text" } } 6.0 seconds <- text still does

Those additional 5.2 seconds are also added to the initial build.

My rough idea of the issue is, that the externalPackagesPlugin looks at every single import that doesn't start with . or / and doesn't cache the results. So tons of @angular/..., rxjs, @ngrx/... and similar imports are resolved over and over again. Even if this function only needs 2ms to run, this quickly adds up.

Minimal Reproduction

https://github.com/sod/ng-serve-external-deps-slowdown
image

The only difference between the development and development-slow configurations in the angular.json are:

            "development": {
            },
            "development-slow": {
              "loader": {
                ".svg": "text"
              }
            },
Your Environment
@angular-devkit/architect       0.1702.0
@angular-devkit/build-angular   17.2.0
@angular-devkit/core            17.2.0
@angular-devkit/schematics      17.2.0
@angular/cli                    17.2.0
@schematics/angular             17.2.0
rxjs                            7.8.1
typescript                      5.3.3
zone.js                         0.14.4
主要语言
TypeScript
星标
27k
派生
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平均合并
16 小时 35 分钟
30 天内合并 PR
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