babel-timing

library0.9.1jsnpmunverified

Measure Babel compilation time per file and per plugin. Version 0.9.1 (beta). Use it to profile Babel when applications or tests take ages to build. Supports CLI, Node API, Webpack plugin, and Jest transformer/reporter. Ships TypeScript types. Distinct from generic profilers by focusing specifically on Babel's transform pipeline, breaking down time by file and by plugin. Active development; minor releases may include breaking changes.

observability testing

npm install babel-timing

github ↗package ↗

INSTALL

IMPORT

SIG · BABEL-TIMING

babel-timing

observabilityjavascriptv0.9.1

Install

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Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

babelTiming

✓ import { babelTiming } from 'babel-timing';

✗ const babelTiming = require('babel-timing');

ESM-only since v0.9.0; CJS require will throw.

BabelTimingPlugin

✓ import { BabelTimingPlugin } from 'babel-timing/webpack/plugin';

✗ const BabelTimingPlugin = require('babel-timing/webpack/plugin');

Named export from a subpath; ESM-only.

BabelTimingReporter

✓ import { BabelTimingReporter } from 'babel-timing/jest/reporter';

✗ import BabelTimingReporter from 'babel-timing/jest/reporter';

Named export, not default; check README for exact export name.

Measure Babel timing on a glob of files, following imports, with custom Babel config and resolve options.

import { babelTiming } from 'babel-timing'; async function main() { const results = await babelTiming(['src/**/*.js'], { babelConfig: './babel.config.js' || false, followImports: true, include: ['**'], exclude: ['**/node_modules/**'], resolveMainFields: ['browser', 'module', 'main'], resolveExtensions: ['.js', '.jsx', '.ts', '.tsx'] }); console.log(JSON.stringify(results, null, 2)); } main().catch(console.error);

babel-timing --version

Debug

Known issues

breakingVersion 0.9.0 migrated to ESM-only. CJS require() will fail.

fix

Use import syntax or upgrade to a CJS-compatible version (<0.9.0).

affects: >=0.9.0

gotchaWhen using Webpack integration, babel-loader cache must be deleted for profiling to be accurate.

fix

Delete ./node_modules/.cache/babel-loader/ before running Webpack.

affects: all

deprecatedCLI option --babelConfig with value false disables Babel config file loading. In future versions, use --no-babel-config instead.

fix

Use --no-babel-config flag instead of --babel-config false.

affects: >=0.9.0

gotchaJest transformer requires --no-cache flag to avoid stale results.

fix

Run Jest with --no-cache flag.

affects: all

breakingSubpath exports (e.g., 'babel-timing/webpack/plugin') were introduced in v0.9.0. Older versions expect different import paths.

fix

Update imports to use subpath exports syntax.

affects: >=0.9.0

Errors

Common errors & fixes

Error [ERR_REQUIRE_ESM]: require() of ES Module from babel-timing

Using require() on an ESM-only package version >=0.9.0.

fix

Use import { babelTiming } from 'babel-timing'; or downgrade to <0.9.0.

Cannot find module 'babel-timing/webpack/plugin'

Importing from a subpath that is not exported in older versions or using wrong path.

fix

Ensure you use babel-timing >=0.9.0 and import using the exact subpath.

BabelTimingPlugin is not a constructor

Using default import when the export is named.

fix

Use import { BabelTimingPlugin } from 'babel-timing/webpack/plugin'; instead of default import.

Upgrade

Version history

0.9.1latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

33 hits · last 30 days

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Resources

githubhttps://github.com/toomuchdesign/babel-timing ↗

packagehttps://www.npmjs.com/package/babel-timing ↗