To install dependencies:

bun install

To run in Bun:

# so it doesn't run the vitest one
bun wiptest expect-to-equal.test.js

To run in Jest:

# If you remove the import the performance doesn't change much
NODE_OPTIONS="--experimental-vm-modules" ./node_modules/.bin/jest expect-to-equal.test.js

To run in Vitest:

./node_modules/.bin/vitest --run expect-to-equal.vitest.test.js

Output on my machine (M1):

bun:test (bun v0.3.0):

[36.40ms] expect().toEqual() x 10000

jest (node v18.11.0)

expect().toEqual() x 10000: 5053 ms

vitest (node v18.11.0)

expect().toEqual() x 10000: 401.08ms

This project was created using bun init in bun v0.3.0. Bun is a fast all-in-one JavaScript runtime.