next/dist/esm/build/webpack/plugins/nextjs-require-cache-hot-reloader.js

The React Framework

import { clearModuleContext } from "../../../server/web/sandbox";
import { realpathSync } from "../../../lib/realpath";
import path from "path";
import isError from "../../../lib/is-error";
import { clearManifestCache } from "../../../server/load-manifest";
const originModules = [
    require.resolve("../../../server/require"),
    require.resolve("../../../server/load-components"),
    require.resolve("../../../server/next-server"),
    require.resolve("../../../compiled/react-server-dom-webpack/client.edge"),
    require.resolve("../../../compiled/react-server-dom-webpack-experimental/client.edge")
];
const RUNTIME_NAMES = [
    "webpack-runtime",
    "webpack-api-runtime"
];
const nextDeleteCacheRpc = async (filePaths)=>{
    if (global._nextDeleteCache) {
        return global._nextDeleteCache(filePaths);
    }
};
export function deleteAppClientCache() {
    if (global._nextDeleteAppClientCache) {
        return global._nextDeleteAppClientCache();
    }
    // ensure we reset the cache for rsc components
    // loaded via react-server-dom-webpack
    const reactServerDomModId = require.resolve("react-server-dom-webpack/client.edge");
    const reactServerDomMod = require.cache[reactServerDomModId];
    if (reactServerDomMod) {
        for (const child of reactServerDomMod.children){
            child.parent = null;
            delete require.cache[child.id];
        }
    }
    delete require.cache[reactServerDomModId];
}
export function deleteCache(filePath) {
    // try to clear it from the fs cache
    clearManifestCache(filePath);
    try {
        filePath = realpathSync(filePath);
    } catch (e) {
        if (isError(e) && e.code !== "ENOENT") throw e;
    }
    const mod = require.cache[filePath];
    if (mod) {
        // remove the child reference from the originModules
        for (const originModule of originModules){
            const parent = require.cache[originModule];
            if (parent) {
                const idx = parent.children.indexOf(mod);
                if (idx >= 0) parent.children.splice(idx, 1);
            }
        }
        // remove parent references from external modules
        for (const child of mod.children){
            child.parent = null;
        }
        delete require.cache[filePath];
        return true;
    }
    return false;
}
const PLUGIN_NAME = "NextJsRequireCacheHotReloader";
// This plugin flushes require.cache after emitting the files. Providing 'hot reloading' of server files.
export class NextJsRequireCacheHotReloader {
    constructor(opts){
        this.prevAssets = null;
        this.hasServerComponents = opts.hasServerComponents;
    }
    apply(compiler) {
        compiler.hooks.assetEmitted.tap(PLUGIN_NAME, (_file, { targetPath  })=>{
            nextDeleteCacheRpc([
                targetPath
            ]);
            // Clear module context in other processes
            if (global._nextClearModuleContext) {
                global._nextClearModuleContext(targetPath);
            }
            // Clear module context in this process
            clearModuleContext(targetPath);
        });
        compiler.hooks.afterEmit.tapPromise(PLUGIN_NAME, async (compilation)=>{
            const cacheEntriesToDelete = [];
            for (const name of RUNTIME_NAMES){
                const runtimeChunkPath = path.join(compilation.outputOptions.path, `${name}.js`);
                cacheEntriesToDelete.push(runtimeChunkPath);
            }
            // we need to make sure to clear all server entries from cache
            // since they can have a stale webpack-runtime cache
            // which needs to always be in-sync
            const entries = [
                ...compilation.entries.keys()
            ].filter((entry)=>{
                const isAppPath = entry.toString().startsWith("app/");
                return entry.toString().startsWith("pages/") || isAppPath;
            });
            for (const page of entries){
                const outputPath = path.join(compilation.outputOptions.path, page + ".js");
                cacheEntriesToDelete.push(outputPath);
            }
            await nextDeleteCacheRpc(cacheEntriesToDelete);
        });
    }
}

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