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fabian-michael

svelte-draft-template's Issues

Race condition between TypeScript and Rollup

Issue

There is a race condition on first run. App.svelte cannot be resolved on first run of the dev script, yet can be resolved on the second run (or upon saving App.tsx). I guess this is because main.js refers to App.Svelte, yet TypeScript hasn't transpiled App.tsx to App.svelte yet.

Installation

git clone https://github.com/mistlog/svelte-draft-template.git
cd svelte-draft-template
npm install

Running the dev script for the first time ❌

npm run dev
> [email protected] dev /Users/jwork/Documents/git/svelte-draft-template
> concurrently "npm run transcribe:watch" "rollup -c -w"

[0] 
[0] > [email protected] transcribe:watch /Users/jwork/Documents/git/svelte-draft-template
[0] > sd ./src -w
[0] 
[1] rollup v1.30.1
[1] bundles src/main.js → public/build/bundle.js...
[1] [!] Error: Could not resolve './App.svelte' from src/main.js
[1] Error: Could not resolve './App.svelte' from src/main.js
[1]     at error (/Users/jwork/Documents/git/svelte-draft-template/node_modules/rollup/dist/shared/node-entry.js:5400:30)
[1]     at ModuleLoader.handleResolveId (/Users/jwork/Documents/git/svelte-draft-template/node_modules/rollup/dist/shared/node-entry.js:12389:24)
[1]     at ModuleLoader.<anonymous> (/Users/jwork/Documents/git/svelte-draft-template/node_modules/rollup/dist/shared/node-entry.js:12277:30)
[1]     at Generator.next (<anonymous>)
[1]     at fulfilled (/Users/jwork/Documents/git/svelte-draft-template/node_modules/rollup/dist/shared/node-entry.js:38:28)
[1]

Running the transcribe:watch script subsequently ✅

npm run transcribe:watch

> [email protected] transcribe:watch /Users/jwork/Documents/git/svelte-draft-template
> sd ./src -w

Running the rollup -c -w script subsequently ✅

node_modules/.bin/rollup -c -w

  Your application is ready~! 🚀

  - Local:      http://localhost:5000

────────────────── LOGS ──────────────────

  [15:46:23] 200 ─ 4.33ms ─ /
  [15:46:23] 200 ─ 1.63ms ─ /global.css
  [15:46:23] 200 ─ 1.44ms ─ /build/bundle.css
  [15:46:23] 200 ─ 1.78ms ─ /build/bundle.js
  [15:46:23] 200 ─ 14.93ms ─ /favicon.png

Running the dev script subsequently once more ✅

npm run dev

  Your application is ready~! 🚀

  - Local:      http://localhost:5000

────────────────── LOGS ──────────────────

  [15:46:23] 200 ─ 4.33ms ─ /
  [15:46:23] 200 ─ 1.63ms ─ /global.css
  [15:46:23] 200 ─ 1.44ms ─ /build/bundle.css
  [15:46:23] 200 ─ 1.78ms ─ /build/bundle.js
  [15:46:23] 200 ─ 14.93ms ─ /favicon.png

Solution

In Webpack, in each rule, it is possible to provide an array of loaders to define an ordered pipeline by which to process files during the bundling process. It is quite common to process from SCSS -> CSS before bundling, for example. I'm sure Rollup will have an equivalent API allowing the TypeScript Compiler (or Babel) to be used to watch .tsx files and process them to .svelte files (ideally without emitting them to disk) without having to deal with a race condition between rollup and TypeScript. What do you think about this approach?

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