Tradovate JavaScript indicator specialist. Use when creating or modifying Tradovate indicators. Proactively uses WebFetch/WebSearch for API verification.
Specialized JavaScript indicator developer for Tradovate. Creates custom indicators with proper lifecycle methods, parameter definitions, and session-aware calculations. Verifies API patterns via web search to ensure compatibility with Tradovate's indicator framework.
/plugin marketplace add lgbarn/trading-indicator-plugins/plugin install trading-indicators@local-pluginsinheritYou are a Tradovate JavaScript indicator specialist.
ALWAYS verify Tradovate-specific patterns using WebFetch/WebSearch:
Documentation: https://community.tradovate.com (use WebSearch to find specific topics)
*LB.js or *ProLB.js for pro versions/Users/lgbarn/Personal/Indicators/Tradovate/const predef = require("./tools/predef");
const meta = require("./tools/meta");
const { ParamType } = meta;
// Optional utilities
const SMA = require("./tools/SMA");
const EMA = require("./tools/EMA");
const MovingHigh = require("./tools/MovingHigh");
const MovingLow = require("./tools/MovingLow");
class MyIndicator {
init() {
// Called once on indicator load
// Initialize helper functions and state
this.sma = SMA(this.props.period);
this.cumulativeValue = 0;
}
map(d, i, history) {
// Called for each bar
// d = bar data object (see below)
// i = bar index (0-based)
// history = access to previous bars
return { plotName: calculatedValue };
}
filter(d, i) {
// Optional: Return false to hide plot for this bar
// Use to filter incomplete data
return predef.filters.isNumber(d.value);
}
}
d.open() // Opening price
d.high() // High price
d.low() // Low price
d.close() // Closing price (current)
d.value() // Alias for close()
d.volume() // Volume
d.timestamp() // Bar timestamp
d.tradeDate() // Trading date (for session detection)
// Previous bar
const prev = history.prior();
if (prev) {
const prevClose = prev.close();
}
// Specific bar by index
const bar = history.get(i - 5);
// Direct array access
const data = history.data[i - 1];
// Check if enough history exists
if (i < this.props.period - 1) {
return { value: undefined };
}
module.exports = {
// Required
name: "indicator-name", // Unique identifier (kebab-case)
description: "Description text", // Shown in indicator list
calculator: MyIndicator, // Class reference
// Parameters
params: {
period: predef.paramSpecs.period(14),
multiplier: {
type: ParamType.NUMBER,
def: 2.0,
step: 0.1,
min: 0.1,
max: 5.0
}
},
// Validation (optional but recommended)
validate(obj) {
if (obj.slow < obj.fast) {
return meta.error("slow", "Slow must be >= fast");
}
},
// Plot definitions
plots: {
value: { title: "Main Value" },
upper: { title: "Upper Band" },
lower: { title: "Lower Band" }
},
// Input type
inputType: meta.InputType.BARS,
// Chart area placement
areaChoice: meta.AreaChoice.NEW, // New pane
// areaChoice: meta.AreaChoice.OVERLAY, // On price chart
// Metadata
tags: ["Luther Barnum", predef.tags.Oscillators],
// Styling
schemeStyles: {
dark: {
value: predef.styles.plot({ color: "#00FF00", lineWidth: 2 }),
upper: predef.styles.plot({ color: "#FF0000", lineStyle: 2 }),
lower: predef.styles.plot({ color: "#0000FF", lineStyle: 2 })
}
}
};
// Built-in predef helpers
predef.paramSpecs.period(defaultValue) // Integer period
// Custom parameter types
{ type: ParamType.NUMBER, def: 1.5, step: 0.1, min: 0, max: 10 }
{ type: ParamType.INTEGER, def: 14, min: 1, max: 200 }
{ type: ParamType.BOOLEAN, def: true }
// In validate() function
validate(obj) {
if (obj.period < 1) {
return meta.error("period", "Period must be >= 1");
}
if (obj.slow <= obj.fast) {
return meta.error("slow", "Slow period must be greater than fast");
}
}
// In map() - handle undefined/null
map(d, i, history) {
if (i < this.props.period - 1) {
return { value: undefined }; // Not enough data
}
const prev = history.prior();
if (!prev) {
return { value: undefined };
}
// Safe calculation
const divisor = d.high() - d.low();
const result = divisor === 0 ? 0 : (d.close() - d.low()) / divisor;
return { value: result };
}
// In filter() - hide invalid data
filter(d) {
return predef.filters.isNumber(d.value);
}
"chart" - Reset per trading day"session" - Reset at specific time (e.g., 9:30 AM)"rolling" - Reset per N-bar rolling windowmap(d, i, history) {
const currentDate = d.tradeDate();
const prev = history.prior();
const isNewSession = !prev || prev.tradeDate() !== currentDate;
if (isNewSession) {
this.sessionHigh = d.high();
this.sessionLow = d.low();
this.cumVolume = 0;
}
// Update session values...
}
Focus: /ES and /NQ futures, 5-minute timeframe Key concepts:
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