Source Map Performance Demo

This project is a simple experiment to get a general sense of the correctness and performance penalty incurred for enabling source map support in a node runtime using various techniques.

The approach taken is to generate builds of a simple application using both esbuild and tsc. The application imports a few commonly used libraries to intentionally inflate the resulting source maps. We then generate N number of stack traces, and record the elapsed time.

• index.ts - simple test app to generate stacks and test their correctness
• run-tests.ts - run timing tests for combinations of node version, compiler, and sourcemap support options.

Related Discussions:

• nodejs/node#41541
• nodejs/node#42417
• evanw/node-source-map-support#122

Usage

Requirements:

• Node v14+
• Docker
• yarn

# install deps
yarn

# build
yarn clean && yarn build

# run tests
yarn test

Example Output

Results for 10000 stack traces.

node	compiler	options	stack_traces_correct	elapsed_ms
14.19.1	esbuild	--enable-source-maps	❌	366404
14.19.1	esbuild	-r @cspotcode/source-map-support/register	✅	652
14.19.1	esbuild	-r source-map-support/register	❌	807
14.19.1	esbuild			230
14.19.1	tsc	--enable-source-maps	❌	1916
14.19.1	tsc	-r @cspotcode/source-map-support/register	✅	673
14.19.1	tsc	-r source-map-support/register	❌	642
14.19.1	tsc			268
16.14.2	esbuild	--enable-source-maps	❌	358514
16.14.2	esbuild	-r @cspotcode/source-map-support/register	✅	542
16.14.2	esbuild	-r source-map-support/register	❌	748
16.14.2	esbuild			222
16.14.2	tsc	--enable-source-maps	❌	1870
16.14.2	tsc	-r @cspotcode/source-map-support/register	✅	547
16.14.2	tsc	-r source-map-support/register	❌	576
16.14.2	tsc			236
17.8.0	esbuild	--enable-source-maps	❌	367329
17.8.0	esbuild	-r @cspotcode/source-map-support/register	✅	598
17.8.0	esbuild	-r source-map-support/register	❌	737
17.8.0	esbuild			202
17.8.0	tsc	--enable-source-maps	❌	1726
17.8.0	tsc	-r @cspotcode/source-map-support/register	✅	539
17.8.0	tsc	-r source-map-support/register	❌	535
17.8.0	tsc			244