Improve error message when using --target lib and the entry file is missing

[fjc0k]

Version

3.0.0-beta.6

Reproduction link

https://github.com/fjc0k/vue-cli-lib-test

Steps to reproduce

1. clone
2. yarn
3. yarn run build

What is expected?

build success

What is actually happening?

build failed with error:

This dependency was not found:

* ~entry in ./node_modules/@vue/cli-service/lib/commands/build/entry-lib.js

To install it, you can run: npm install --save ~entry

---

notice: the main.js file is not default

[LinusBorg]

The entry can be either a .js or a .vue file. If no entry is specified, src/App.vue will be used.

Your build command should look like this:

"build": "vue-cli-service build --target lib --name ff src/main.js",

We should definitely show a better error when the entry file isnt' found. I would assume we have such a check, but it comes after the config setup that breaks with the shown error when building a lib.

[LinusBorg]

We should probably check if the entry file exists right around here:

https://github.com/vuejs/vue-cli/blob/dev/packages/%40vue/cli-service/lib/commands/build/index.js#L30

[markfknight]

Will there be support for TypeScript (.ts) files in the future?

[lunsdorf]

I ran into this issue today (using @vue/cli-service in version 4.4.1) and spent quite some time finding the issue and therefor decided to share my findings.

This error can occur if you override the alias config in vue.config.js. So instead of doing this:

config.resolve.alias = myAliasConfig

you should do something like this:

config.resolve.alias = { ...config.resolve.alias, ...myAliasConfig }

This also fixes the same issue when building web-components and the error is something like ~root/src/app.vue?shadow in ./node_modules/@vue/cli-service/lib/commands/build/entry-wc.js.

I hope this saves some of you a lot of time debugging.