@pond-ts/financial API Reference
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    Interface SessionRules

    The rule-based construction path: a compact description that generates a session schedule over a date range. The other, first-class path is an explicit Session list (see session.ts); rules are for consumers who have hours + a holiday list rather than dated instants.

    Session hours are given in exchange-local wall time against an IANA zone and resolved to UTC instants per-day, so DST is handled correctly (a 09:30 open is 09:30 local year-round, not a fixed UTC offset).

    Only regular (same-day, open < close) sessions are supported here, plus the full-day "24:00" close. True overnight sessions (close on the next calendar day, e.g. CME 17:00→16:00) need an explicit trading-day-assignment rule and are deferred to a later phase — build those via an explicit Session list for now.

    interface SessionRules {
        breaks?: readonly { end: string; start: string }[];
        close: string;
        earlyCloses?: readonly { close: string; date: string }[];
        holidays?: readonly string[];
        open: string;
        timeZone: string;
        weekmask?: readonly number[];
    }
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    Properties

    breaks? close earlyCloses? holidays? open timeZone weekmask?

    Properties

    breaks?: readonly { end: string; start: string }[]

    Intraday breaks (e.g. a lunch), each local "HH:MM", within [open, close].

    close: string

    Regular close, local "HH:MM" (or "24:00" for end-of-day). Must be after open.

    earlyCloses?: readonly { close: string; date: string }[]

    Per-date early closes (YYYY-MM-DD → local "HH:MM") — half-days that override the regular close.

    holidays?: readonly string[]

    Dates (YYYY-MM-DD) with no session — the market is closed.

    open: string

    Regular open, local "HH:MM".

    timeZone: string

    IANA zone the wall-clock hours are interpreted in, e.g. "America/New_York".

    weekmask?: readonly number[]

    Trading days of week as ISO weekday numbers (1 = Monday … 7 = Sunday). Defaults to Monday–Friday [1, 2, 3, 4, 5].

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