mini repl for svelte2tsx

[pushkine]

Adds a svelte file under svelte2tsx/repl that automatically compiles its content to tsx on dev mode
Adds a debug package script, attaching a debugger to it will inspect the compiling process of the repl directly in the ts source

[dummdidumm]

Not quite sure why we need this? Isn't all this handled without Rollup, just through sucrase?

[pushkine]

This part uses rollup watch, so just by having the dev script running in the background it automatically updates the repl results on save. i.e. Everything is instant, just hit ctrl+s on any change anywhere ( source or repl input ) and the results get live updates like an actual repl would

It is true that sucrase computes the same thing but you have to run it yourself and checking values in the debugger is a much slower process

[pushkine]

On a side note that part only outputs tsx right now, I imagine there are other outputs that could be interesting to print

[dummdidumm]

Could we use ts-node instead? We already have that in this repo and it might serve the same use case and we avoid another dependency.

[pushkine]

I agree and I tried many things, but ts-node refuses to work due to a side issue in tsconfig
Sucrase just works, it's also much faster afaik

[dummdidumm]

I got this running insive VS Code with this addition to launch.json:

{
            "type": "node",
            "request": "launch",
            "name": "Run REPL with debugger",
            "runtimeArgs": ["-r", "ts-node/register"],
            "args": ["${workspaceFolder}/packages/svelte2tsx/repl/debug.ts"],
            "env": {
                "TS_NODE_COMPILER_OPTIONS": "{\"esModuleInterop\":true, \"target\": \"es2018\"}",
                "TS_NODE_TRANSPILE_ONLY": "true"
            },
            "console": "integratedTerminal",
            "internalConsoleOptions": "neverOpen"
        },

Does this work for you, too? If so, I would propose ditching the debug script inside package.json and instead use that launch script.