next/dist/esm/lib/profiles-dir.js

The React Framework

import { existsSync, mkdirSync, writeFileSync } from 'fs';
import { join } from 'path';
/**
 * Name of the directory at the project root where profiling output (CPU
 * profiles and Turbopack traces) is written when profiling is enabled (see the
 * `--experimental-cpu-prof` and `--internal-trace` CLI flags). It is a
 * fixed-name sibling of `distDir`, not configurable.
 *
 * Keep this in sync with `DIST_PROFILES_DIR_NAME` in
 * `crates/next-core/src/next_config.rs`.
 */ export const PROFILES_DIR_NAME = '.next-profiles';
const GITIGNORE_CONTENTS = `# Created automatically by Next.js. Profiling output should not be committed.
*
`;
/**
 * Create the `.next-profiles` directory under `dir` and return its absolute
 * path. This is the single place that creates the directory — the Rust trace
 * writer relies on it already existing.
 *
 * Also writes a `.gitignore` containing `*` (if one isn't already there) so the
 * potentially large profiling output is excluded from git and gitignore-aware
 * tools (Tailwind, Turborepo, ...) skip the subtree instead of reading it and
 * hanging/OOMing.
 */ export function ensureProfilesDir(dir) {
    const profilesDir = join(dir, PROFILES_DIR_NAME);
    mkdirSync(profilesDir, {
        recursive: true
    });
    const gitignorePath = join(profilesDir, '.gitignore');
    if (!existsSync(gitignorePath)) {
        try {
            writeFileSync(gitignorePath, GITIGNORE_CONTENTS);
        } catch  {
        // A missing .gitignore must not abort a profiling run.
        }
    }
    return profilesDir;
}

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