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Santhosh Janardhanan de2d83092e feat: Reinitialize frontend with SvelteKit and TypeScript

- Delete old Vite+Svelte frontend
- Initialize new SvelteKit project with TypeScript
- Configure Tailwind CSS v4 + DaisyUI
- Implement JWT authentication with auto-refresh
- Create login page with form validation (Zod)
- Add protected route guards
- Update Docker configuration for single-stage build
- Add E2E tests with Playwright (6/11 passing)
- Fix Svelte 5 reactivity with $state() runes

Known issues:
- 5 E2E tests failing (timing/async issues)
- Token refresh implementation needs debugging
- Validation error display timing

2026-02-17 16:19:59 -05:00

1.6 KiB

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estree-walker

Simple utility for walking an ESTree-compliant AST, such as one generated by acorn.

Installation

npm i estree-walker

Usage

var walk = require( 'estree-walker' ).walk;
var acorn = require( 'acorn' );

ast = acorn.parse( sourceCode, options ); // https://github.com/acornjs/acorn

walk( ast, {
  enter: function ( node, parent, prop, index ) {
    // some code happens
  },
  leave: function ( node, parent, prop, index ) {
  	// some code happens
  }
});

Inside the enter function, calling this.skip() will prevent the node's children being walked, or the leave function (which is optional) being called.

Call this.replace(new_node) in either enter or leave to replace the current node with a new one.

Call this.remove() in either enter or leave to remove the current node.

Why not use estraverse?

The ESTree spec is evolving to accommodate ES6/7. I've had a couple of experiences where estraverse was unable to handle an AST generated by recent versions of acorn, because it hard-codes visitor keys.

estree-walker, by contrast, simply enumerates a node's properties to find child nodes (and child lists of nodes), and is therefore resistant to spec changes. It's also much smaller. (The performance, if you're wondering, is basically identical.)

None of which should be taken as criticism of estraverse, which has more features and has been battle-tested in many more situations, and for which I'm very grateful.

License

MIT

1.6 KiB Raw Blame History