Pulse Agent
0889ee9117
feat(hooks): add useLiveStream generic WebSocket hook - supports websocket/sse/polling transports - exponential backoff reconnect with jitter - circular buffer with configurable size - typed filter callback per use case - manual disconnect + reconnect + error state feat(hooks): add useLiveMetrics derived hook - sliding time-window cut - moving average (configurable window) - current / avg / min / max / ratePerSecond - zero allocations per tick (memoized) feat(charts): add LiveMetricChart molecule (Recharts) - line + area variants, grid + tooltip - moving-average overlay (dashed) - ConnectionStatus atom in header - status bar + compact mode - 100% responsive, GPU via SVG ViewBox feat(atoms): add ConnectionStatus indicator - 5 states: disconnected/connecting/connected/reconnecting/error - animated pulse, JetBrains Mono, pill style - exported helpers: formatLatency / formatBytes docs(pkg): bump v0.1.0 → v0.2.0, add recharts peerDep
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(node, parent, prop, index) {
// some code happens
},
leave(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