esbuild@0.15.3 inserts the "use strict"; directive before the configured banner

[merceyz]

Describe the bug

Starting in esbuild@0.14.44, esbuild inserts the "use strict"; directive before the configured banner.

Ref yarnpkg/berry#4732

To Reproduce

docker run --rm -it node:16.16.0 bash
cd $(mktemp -d)
yarn init -2
yarn set version 3.2.2
yarn add esbuild@0.15.3
printf '{"compilerOptions": {"strict": true}}' > tsconfig.json
printf "console.log(42)" > foo.js
yarn esbuild --banner:js='#!/usr/bin/env node' ./foo.js | node

[evanw]

Ah ok, I can make this work. FWIW the current way to use a hashbang is to put it in the entry point source file.