M. George Hansen
5118a8174b
* chore: replace eslint & prettier w/ biomejs * fix syntax error in ci.yml workflow * ensure that build CI jobs only run if check job succeeds to save resources
75 lines
1.9 KiB
TypeScript
75 lines
1.9 KiB
TypeScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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import { isErrnoException } from "./error";
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const resolveModulePath = (importPath: string): string | undefined => {
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try {
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return require.resolve(importPath);
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} catch (error) {
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if (
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error instanceof Error &&
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isErrnoException(error) &&
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error.code === "MODULE_NOT_FOUND"
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) {
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return;
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}
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throw error;
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}
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};
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const removeParentModuleRef = (mod: NodeModule): void => {
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const parent = mod.parent;
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if (parent == null) {
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return;
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}
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const siblings = parent.children;
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const nSiblings = siblings.length;
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for (let i = nSiblings - 1; i >= 0; i--) {
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const sibling = siblings[i];
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if (sibling.id === mod.id) {
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siblings.splice(i, 1);
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return;
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}
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}
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};
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/**
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* Clear a module and its dependencies from node's module cache, ensuring that
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* requiring the module again will reload the code from disk.
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*
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* @param importPath Path or name of the module to resolve (same as
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* {@see require}).
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*
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* @throws Error if the module could not be resolved due to filesystem error.
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*/
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export const decacheModule = (importPath: string): void => {
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const modulePath = resolveModulePath(importPath);
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if (modulePath == null) {
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return;
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}
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// DFS the module dependency tree, using iteration to avoid stack size
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// exceeded exceptions.
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const modsToCheck: NodeModule[] = [];
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const visited: Set<string> = new Set();
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let currentMod: NodeModule | undefined = require.cache[modulePath];
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while (currentMod != null) {
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if (visited.has(currentMod.id)) {
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currentMod = modsToCheck.pop();
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continue;
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}
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removeParentModuleRef(currentMod);
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delete require.cache[currentMod.id];
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for (const childMod of currentMod.children) {
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modsToCheck.push(childMod);
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}
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visited.add(currentMod.id);
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currentMod = modsToCheck.pop();
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}
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};
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