agentfootprint/dist/esm/trace-toolpack/storedCauseOptions.js

The explainable agent framework — backtrack a wrong answer to the exact context that caused it (evidence, not guesses). Built on footprintjs.

import { ownData } from '../lib/boundedJson.js';
const DEFAULT_READER_LIMITS = Object.freeze({
    entries: 16_384,
    missingCommits: 4096,
    drillDepth: 64,
    addressLength: 2048,
});
const READER_CEILINGS = { ...DEFAULT_READER_LIMITS, entries: 65_536 };
const LIMIT_KEYS = Object.keys(DEFAULT_READER_LIMITS);
/** Only the declared host settings; no coercion, getters, inherited overrides or mutable options bag. */
export function storedCauseOptions(value) {
    const data = ownData(value, ['runId', 'readerLimits', 'maxBytes', 'signal']);
    if (typeof data.runId !== 'string' || data.runId.length === 0 || data.runId.length > 128)
        throw Error('Invalid stored cause options.');
    const maxBytes = data.maxBytes === undefined ? 1024 * 1024 : data.maxBytes;
    if (!Number.isSafeInteger(maxBytes) ||
        maxBytes < 1 ||
        maxBytes > 8 * 1024 * 1024)
        throw Error('Invalid stored cause options.');
    const provided = data.readerLimits === undefined ? {} : ownData(data.readerLimits, LIMIT_KEYS);
    for (const key of LIMIT_KEYS) {
        const limit = provided[key];
        if (limit !== undefined &&
            (!Number.isSafeInteger(limit) ||
                limit < 0 ||
                limit > READER_CEILINGS[key]))
            throw Error('Invalid stored cause options.');
    }
    // Bound the upstream reader before it can allocate gap rows or iterate its very large defaults.
    const limits = {
        ...DEFAULT_READER_LIMITS,
        ...Object.fromEntries(Object.entries(provided).filter(([, limit]) => limit !== undefined)),
    };
    const signal = data.signal;
    if (signal !== undefined && !(signal instanceof AbortSignal))
        throw Error('Invalid stored cause options.');
    return {
        runId: data.runId,
        maxBytes: maxBytes,
        readerLimits: limits,
        ...(signal !== undefined && { signal: signal }),
    };
}
/** Call the platform getter itself, so a host subclass cannot replace this observation with code. */
export function storedCauseCancelled(signal) {
    if (!signal)
        return false;
    const getter = Object.getOwnPropertyDescriptor(AbortSignal.prototype, 'aborted')?.get;
    if (!getter)
        throw Error('Abort signal observation is unavailable.');
    return getter.call(signal);
}
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