@netlify/build/lib/plugins_core/pre_dev_cleanup/index.js

Netlify build module

import { rm, stat } from 'node:fs/promises';
import { resolve } from 'node:path';
const dirExists = async (path) => {
    try {
        await stat(path);
        return true;
    }
    catch {
        return false;
    }
};
const getDirtyDirs = async function ({ buildDir, constants: { INTERNAL_EDGE_FUNCTIONS_SRC, INTERNAL_FUNCTIONS_SRC }, }) {
    const dirs = [];
    if (INTERNAL_FUNCTIONS_SRC && (await dirExists(resolve(buildDir, INTERNAL_FUNCTIONS_SRC)))) {
        dirs.push(INTERNAL_FUNCTIONS_SRC);
    }
    if (INTERNAL_EDGE_FUNCTIONS_SRC && (await dirExists(resolve(buildDir, INTERNAL_EDGE_FUNCTIONS_SRC)))) {
        dirs.push(INTERNAL_EDGE_FUNCTIONS_SRC);
    }
    return dirs;
};
const coreStep = async (input) => {
    const dirs = await getDirtyDirs(input);
    for (const dir of dirs) {
        await rm(resolve(input.buildDir, dir), { recursive: true, force: true });
    }
    input.systemLog(input.logs, `Cleaned up ${dirs.join(', ')}.`);
    return {};
};
const condition = async (input) => {
    const dirs = await getDirtyDirs(input);
    return dirs.length > 0;
};
export const preDevCleanup = {
    event: 'onPreDev',
    coreStep,
    coreStepId: 'pre_dev_cleanup',
    coreStepName: 'Pre Dev cleanup',
    coreStepDescription: () => 'Cleaning up leftover files from previous builds',
    condition,
    quiet: true,
};