counterfact/dist/server/module-dependency-graph.js

a library for building a fake REST API for testing

import { dirname, resolve } from "node:path";
import precinct from "precinct";
export class ModuleDependencyGraph {
    dependents = new Map();
    loadDependencies(path) {
        try {
            return precinct.paperwork(path);
        }
        catch {
            return [];
        }
    }
    clearDependents(path) {
        this.dependents.forEach((group) => {
            group.delete(path);
        });
    }
    load(path) {
        this.clearDependents(path);
        for (const dependency of this.loadDependencies(path)) {
            if (!dependency.startsWith(".")) {
                return;
            }
            const key = resolve(dirname(path), dependency);
            if (!this.dependents.has(key)) {
                this.dependents.set(key, new Set());
            }
            this.dependents.get(key)?.add(path);
        }
    }
    dependentsOf(path) {
        const marked = new Set();
        const dependents = new Set();
        const queue = [path];
        while (queue.length > 0) {
            const file = queue.shift();
            if (file !== undefined && !marked.has(file)) {
                marked.add(file);
                const fileDependents = this.dependents.get(file);
                if (fileDependents) {
                    for (const dependent of fileDependents) {
                        dependents.add(dependent);
                        queue.push(dependent);
                    }
                }
            }
        }
        return dependents;
    }
}