npm build error with svelte: Plugin typescript: #rollup/plugin-typescript TS2307: Cannot find module 'X' or its corresponding type declarations - npm

Question

I am trying to build a component library with svelte. I tried to build it with:
npm build
I got the error message:
Plugin typescript: #rollup/plugin-typescript TS2307: Cannot find module './components/MyComponent.svelte' or its corresponding type declarations.
The components I want to export are in the index.tsx:
export { default as MyComponent } from "./components/MyComponent.svelte";
My tsconfig:
{
"extends": "#tsconfig/svelte/tsconfig.json",
"include": ["src/**/*"],
"exclude": ["node_modules/*", "__sapper__/*", "public/*"],
"compilerOptions": {
"target": "es2016",
"module": "esnext",
"outDir": "dist",
"strict": true,
"moduleResolution": "node",
"esModuleInterop": true,
"declaration": true,
"skipLibCheck": true,
"forceConsistentCasingInFileNames": true
},
"importsNotUsedAsValues": "remove"
}
My rollup.config.js:
import svelte from 'rollup-plugin-svelte';
import resolve from 'rollup-plugin-node-resolve';
import postcss from 'rollup-plugin-postcss';
import peerDepsExternal from 'rollup-plugin-peer-deps-external';
import json from '#rollup/plugin-json';
import autoPreprocess from 'svelte-preprocess';
import typescript from '#rollup/plugin-typescript';
import nodeResolve from '#rollup/plugin-node-resolve';
const pkg = require('./package.json');
export default {
input: 'src/index.tsx',
output: [
{
file: pkg.main,
format: 'cjs',
sourcemap: false,
},
{
file: pkg.module,
format: 'esm',
sourcemap: false,
},
],
plugins: [
json({ compact: true }),
svelte({
preprocess: autoPreprocess(),
}),
resolve(),
nodeResolve(),
typescript({ sourceMap: true, rootDir: './src' }),
peerDepsExternal(),
postcss({
extensions: ['.css'],
}),
],
};
Does anyone already had such a problem? Thanks in advance!

Answer 1

You may have to add a type declaration like this:
import type { SvelteComponentTyped } from 'svelte';
declare module '*.svelte' {
export default SvelteComponentTyped;
}
The svelte package also provides something like this via svelte/types/runtime/ambient.d.ts, though it may not be visible to tsc depending on configuration.
Maybe you could also include this file somehow via the tsconfig.json.