@lucrtrade/chartmint

A DSL-driven library for defining trading concepts, generating synthetic OHLC examples that satisfy them, and rendering explanatory charts via Lightweight Charts.

ESM-only. lightweight-charts is an optional peerDependency — required only if you use applyToChart.

Install

bun add @lucrtrade/chartmint
# or
npm install @lucrtrade/chartmint

# Required only if you use `applyToChart`:
bun add lightweight-charts

Headless quick-start

import { compile, generate, buildPlan, patterns } from "@lucrtrade/chartmint";

const compiled = compile(patterns.bullish_fvg.source);
const result = generate(patterns.bullish_fvg, { seed: 42 });
const plan = buildPlan(result, compiled.semantic!);

console.log(plan.candles.length); // 30
console.log(plan.zones[0]); // { name: "gap", time1, price1, time2, price2, color, ... }
console.log(result.verification.must); // [ { predicate, passed: true } ]

Browser quick-start

import { createChart } from "lightweight-charts";
import { compile, generate, buildPlan, applyToChart, patterns } from "@lucrtrade/chartmint";

const chart = createChart(document.getElementById("chart")!);
const compiled = compile(patterns.bullish_fvg.source);
const result = generate(patterns.bullish_fvg, { seed: 42 });
applyToChart(chart, buildPlan(result, compiled.semantic!));

Theme override

buildPlan is the headless theme boundary. You can override the semantic DSL colors without changing the pattern source:

const plan = buildPlan(result, compiled.semantic!, {
  palette: {
    fill: {
      amber: "#f59e0b33",
    },
    line: {
      white: "#e5e7eb",
      green: "#10b981",
    },
    defaults: {
      zoneFill: "#f59e0b22",
      levelLine: "#e5e7eb",
      marker: "#38bdf8",
    },
  },
});

fill and line are typed as partial semantic color maps keyed by amber | blue | green | red | gray | white. defaults apply when the DSL statement omits an explicit color.

DSL surface (v0.1.0)

pattern <name>
bars <id>(, <id>)*
[series <int>]                # default 30
[seed (<int> | random)]       # default random
must <predicate>
should <predicate | hint>
derive <obj>.<prop> = <expr>
when <predicate> then <obj>.<prop> = (<expr> | <ident>)
draw <derived-name> as (box | line) [<color>]
label <bar-id> as <text> [<color>]

# expressions
<bar>.<open|high|low|close> | <number> | (body|range|mid)(<bar>) | <expr> (+|-|*|/) <expr>

# predicates
<expr> <op> <expr>           # op = < | > | <= | >= | =
direction(<bar>) = (bullish | bearish)

# hints (named registry — these reshape generation)
force_bullish <bar> | force_bearish <bar> | impulsive <bar>
body_ratio <bar> >= <number>
equal_highs <a> <b> | equal_lows <a> <b>

# colors
amber | blue | green | red | gray | white

Patterns shipped in v0.1.0

Pattern	Concept	Drawkind
bullish_fvg	3-bar gap (a.high < c.low)	box
bullish_bos	Break of prior high	line
equal_highs	Two near-equal highs	line

API

import {
  version, // string — e.g. "0.0.8"
  compile, // (source: string) => CompileResult
  generate, // (specOrSource: CompileResult | string | PatternTemplate, opts?) => GenerateResult
  buildPlan, // (result: GenerateResult, model: SemanticModel) => RenderPlan
  applyToChart, // (chart: IChartApi, plan: RenderPlan) => RenderHandles
  patterns, // { bullish_fvg, bullish_bos, equal_highs }
  CompileError,
  GenerationError,
  RenderError,
} from "@lucrtrade/chartmint";

compile never throws — it returns { ast?, semantic?, errors: CompileError[] }. generate throws GenerationError(kind: "must_failed") on a must failure that survives the one-shot repair pass; retry with a new seed.

generate options

type GenerateOptions = {
  seed?: number; // fixed seed for reproducibility
  timeframe?: number; // seconds per bar — default 86400 (daily)
  endTime?: number; // Unix timestamp (seconds) of the last bar — default: today's UTC midnight
  tolerance?: { equalPrice?: number };
};

Bars are assigned real UTC timestamps. The last bar lands at endTime; earlier bars count back by timeframe. Passing endTime explicitly makes results fully deterministic across environments.

Dynamic module caching (CDN / browser)

When loading chartmint dynamically, key your cache on version to avoid serving a stale module after a version upgrade:

import { version } from "@lucrtrade/chartmint";

const CACHE_KEY = `__chartmint_${version}`;
if (!window[CACHE_KEY]) {
  window[CACHE_KEY] = loadModule();
}
return window[CACHE_KEY];

Develop

bun install
bun run dev | build | test | test:watch | lint | format | typecheck | ci

Release

See docs/superpowers/specs/2026-05-07-chartmint-v0.1.0-design.md for the full design and .github/workflows/release.yml for the publish pipeline (npm Trusted Publishing + GitHub Packages + GitHub Release).

License

MIT