34 lines
874 B
TypeScript
34 lines
874 B
TypeScript
// 檔案系統與時鐘由外部注入，核心不直接碰真實環境
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export interface Fs {
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read(path: string): Promise<string | null>
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/** 原子寫入：先寫暫存檔再改名 */
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write(path: string, data: string): Promise<void>
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}
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export type Clock = () => number
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export function memoryFs(): Fs & { files: Map<string, string> } {
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const files = new Map<string, string>()
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return {
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files,
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async read(p) {
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return files.get(p) ?? null
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},
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async write(p, d) {
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files.set(p, d)
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},
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}
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}
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export async function readJson<T>(fs: Fs, path: string, fallback: T): Promise<T> {
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const raw = await fs.read(path)
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if (raw === null) return fallback
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try {
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return JSON.parse(raw) as T
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} catch {
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return fallback
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}
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}
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export const writeJson = (fs: Fs, path: string, value: unknown) => fs.write(path, JSON.stringify(value, null, 2))
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