@enspirit/emb/dist/src/prerequisites/FilePrerequisitePlugin.js

A replacement for our Makefile-for-monorepos

import { stat } from 'node:fs/promises';
import pMap from 'p-map';
export class FilePrerequisitePlugin {
    async diff(component, prerequisites, previous, _actual) {
        const stats = await this.getStats(component, prerequisites);
        const changes = stats
            .filter((s) => {
            return s.mtimeMs > Number.parseInt(previous, 10);
        })
            .map((s) => ({
            path: s.path,
            type: s.type,
        }));
        return changes.length > 0 ? changes : null;
    }
    async meta(component, prerequisites, mode) {
        switch (mode) {
            case 'post': {
                return Date.now().toString();
            }
            case 'pre': {
                const stats = await this.getStats(component, prerequisites);
                const max = stats.reduce((minimum, stat) => {
                    return Math.max(minimum, stat.mtimeMs);
                }, 0);
                return max.toFixed(0).toString();
            }
            default: {
                throw new Error(`Invalid mode passed to 'meta()': ${mode}`);
            }
        }
    }
    async getStats(component, prerequisites) {
        return pMap(prerequisites, async (file) => {
            return {
                ...file,
                ...(await stat(component.join(file.path))),
            };
        }, { concurrency: 30 });
    }
}