Issue with transform.ts

[christophrathvaltech]

I'm building a production build with vite-plugin-dts v3.4.0 and i get an error.

It seems, that in line 101 of
vite-plugin-dts/src/transform.ts

the argument aliases was set to undefined by vite config or other plugins and is not checked by the condition below.

...
function transformAliasImport(filePath, content, aliases, exclude = []) {
  if (!aliases.length)
    return content;
 ...

I've forked this repo and fixed this line by

  if (!aliases || !aliases.length)

and it works for my usecase.

Heres my vite.config.js

import multiInput from 'rollup-plugin-multi-input'
import {assetDir, entryFileNames, processAssetFileNames, processChunkFileNames} from './config/assets.js'
import dts from 'vite-plugin-dts'
import {resolve} from 'path'

/** @type {import('vite').UserConfig} */
export default {
    publicDir: 'static',
    assetsInclude: ['**/*.md', '**/*.svg'],
    build: {
        minify: true,
        assetsDir: assetDir,
        sourcemap: true,
        lib: {
            entry: './src/index.ts',
            formats: ['es'] // pure ESM package
        },
        rollupOptions: {
            output: {
                entryFileNames: entryFileNames,
                assetFileNames: processAssetFileNames,
                chunkFileNames: processChunkFileNames
            },
            external: [
                'lit',
                'lit-element',
                'lit-html',
                'lit/html.js',
                'lit/directives/class-map.js',
                'lit/directives/if-defined.js',
                'lit/directives/style-map.js',
                'lit/directives/unsafe-html.js',
                'lit/directives/unsafe-svg.js',
                'lit/directives/repeat.js',
                'lit/decorators.js',
                '@open-wc/testing-helpers',
                '@open-wc/testing'
            ],
            input: [
                'src/index.ts',
                'src/components/**/index.ts',
                'src/modules/**/index.ts',
                'src/utilities/**/index.ts',
                'src/internal/utils/**/index.ts',
                'src/mixins/index.ts'
            ],
            plugins: [
                multiInput(),
                dts({
                    outDir: 'dist',
                    include: ['src']
                })
            ]
        },
        commonjsOptions: {
            include: 'node_modules/**'
        },
        dynamicImportVarsOptions: {
            include: ['src/**/*.(js|ts|svg)']
        }
    },
    test: {
        globals: true,
        environment: 'jsdom',
        setupFiles: ['./config/vitest-setup.ts']
    }
}