Add createEmptyChart() counterpart to parseChartAndIni#99
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This was referenced Apr 20, 2026
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Builds a minimal valid ParsedChart from scratch: default 480 resolution, 120 BPM at tick 0, 4/4 time signature at tick 0, empty tracks/sections/ metadata/vocal parts/unrecognized events. chartBytes defaults to an empty Uint8Array (no source bytes), format defaults to 'chart', iniChartModifiers to the library defaults. Options let callers override resolution, bpm, timeSignature, and format. Useful for programmatic chart generation (e.g. downstream code that builds charts up from scratch rather than parsing source bytes).
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Context
Adds a programmatic builder for `ParsedChart` — the counterpart to `parseChartAndIni` for consumers who construct charts from scratch (e.g. generating a chart from ML-transcribed drum data) rather than parsing source bytes.
Shape
```ts
export function createEmptyChart(options?: {
format?: 'chart' | 'mid' // default 'chart'
resolution?: number // default 480
bpm?: number // default 120
timeSignature?: { numerator: number; denominator: number } // default 4/4
}): ParsedChart
```
Returns a minimal valid `ParsedChart` with defaults filled in: requested resolution, single tempo at tick 0, single time signature at tick 0, empty tracks/sections/vocalTracks/unrecognized events, `chartBytes` as an empty `Uint8Array` (no source), `iniChartModifiers` set to `defaultIniChartModifiers`.
Depends on
PRs #97 + #98 — stacked on the same line. Diff against master currently includes those changes; once they merge upstream, this diff becomes clean (~60 lines of new code + tests).