Files
deepseek-harness/packages/core/session/src/json.ts
Tianyi Cui d02e9f1bd6 Reorganize packages into a modular hierarchy
Move the 18 flat packages/<name> packages into role-grouped dirs:
core/, llm/, bash/, session-persistence/, ui/, support/. Group dirs are
pure containers; each package keeps its @deepseek-ai/dsh-* name.

Collapse the per-package tsconfig paths maps (base + typecheck) into one
@deepseek-ai/dsh-* wildcard with a candidate per group, and derive the
publint list from the hierarchy. Update all depth-coupled globs/configs
(workspace, tsdown, vitest, eslint, knip, tsconfig includes/refs,
per-package tsconfigs, generators, doc-script scopes, type-equiv manifest)
and the cross-package/script relative imports in tests.

Fix doc-typecheck's workspacePaths() to parse tsconfig JSONC via the
TypeScript API instead of a regex comment-strip, which corrupted the
new wildcard `/*/` path candidates.

WIP: doc cross-links and package/RFC docs still to update.
2026-06-20 22:55:20 +08:00

72 lines
3.1 KiB
TypeScript

/**
* JSON-serializability validation for session event data.
*
* The session event log is the durable source of truth (the event-sourcing / session-persistence RFCs): every
* `event.data` must round-trip losslessly through JSON so any persistence
* backend can store and reload it byte-identically. This invariant belongs to
* the log itself — `Session.append` enforces it at the source, so a
* non-serializable event never enters `session.events` and the live log can
* never diverge from what a backend can persist. Backends re-use the same
* predicate to validate their own `append(events)` entry point (replay/fork
* paths that do not go through a live `Session`).
*
* @module @deepseek-ai/dsh-session/json
*/
/**
* Whether `value` is losslessly JSON-serializable: only `null`, finite numbers,
* booleans, strings, plain arrays, and plain objects of such values. Rejects
* `BigInt`, function, symbol, `undefined`, non-finite numbers (`NaN`/`Infinity`,
* which `JSON.stringify` turns into `null`), and exotic objects (`Map`/`Set`/
* `Date`/class instances) — anything `JSON.stringify` would drop, throw on, or
* convert lossily. Sparse arrays are rejected too: a hole serializes to `null`,
* so `[1, , 3]` would not round-trip. Detects circular references (which would
* throw) and reports them as non-serializable rather than propagating the throw.
*
* Scope — matches `JSON.stringify` exactly: only an object's OWN ENUMERABLE
* STRING-keyed properties are inspected (`Object.values`). Symbol-keyed and
* non-enumerable properties are NOT examined, because `JSON.stringify` likewise
* drops them — they never reach the durable form, so a non-serializable value
* hiding under a symbol/non-enumerable key cannot make the round-trip lossy.
* Getters are invoked during the check (again as `JSON.stringify` would), so the
* contract is for plain data records, not objects with side-effecting accessors.
*/
export function isJsonValue(value: unknown, seen: Set<object> = new Set()): boolean {
if (value === null) return true
switch (typeof value) {
case 'boolean':
case 'string':
return true
case 'number':
return Number.isFinite(value)
case 'bigint':
case 'function':
case 'symbol':
case 'undefined':
return false
case 'object':
break // handled below
}
// object
if (seen.has(value)) return false // circular
seen.add(value)
try {
if (Array.isArray(value)) {
// Reject sparse arrays: a hole is skipped by `every`/`forEach` but
// JSON.stringify writes it as `null`, so `[1, , 3]` would round-trip
// lossily. Require every index 0..length-1 to be an OWN property.
for (let i = 0; i < value.length; i++) {
if (!Object.prototype.hasOwnProperty.call(value, i)) return false
if (!isJsonValue(value[i], seen)) return false
}
return true
}
// Plain object only (reject Map/Set/Date/class instances).
const proto = Object.getPrototypeOf(value) as unknown
if (proto !== Object.prototype && proto !== null) return false
return Object.values(value).every(v => isJsonValue(v, seen))
} finally {
seen.delete(value)
}
}