esbuild How to build a product without a filesystem - esbuild

Question

I want esbuild to automatically handle the duplicate imports in the file for me, and I also want to use its tree shaking capabilities to help me optimise my code and then output it to a file, I wrote the following code to try and do the above, but I could never get it right
export interface ConfigSource extends Partial<Options> {
code: string
name: string
loader: Loader
}
export interface Config {
sources: ConfigSource[]
options?: BuildOptions
}
function babelBuildWithBundle(main: ConfigSource, config: Config) {
const buildModuleRuntime: Plugin = {
name: 'buildModuleRuntime',
setup(build) {
build.onResolve({ filter: /\.\// }, (args) => {
return { path: args.path, namespace: 'localModule' }
})
build.onLoad({ filter: /\.\//, namespace: 'localModule' }, (args) => {
const source = config.sources.find(
(source) =>
source.name.replace(/\..+$/, '') === args.path.replace(/^\.\//, '')
)
const content = source?.code || ''
return {
contents: content,
loader: source?.loader || 'js',
}
})
},
}
return build(
{
stdin: {
contents: main.code,
loader: main.loader,
sourcefile: main.name,
resolveDir: path.resolve('.'),
},
bundle: true,
write: false,
format: 'esm',
outdir: 'dist',
plugins: [buildModuleRuntime],
}
)
}
const foo = `
export const Foo = FC(() => {
return <div>gyron</div>
})
`
const app = `
import { Foo } from './foo'
function App(): any {
console.log(B)
return <Foo />
}
`
const bundle = await babelBuildWithBundle(
{
loader: 'tsx',
code: app,
name: 'app.tsx',
},
{
sources: [
{
loader: 'tsx',
code: foo,
name: 'foo.tsx',
},
],
}
)
Then the only answer I got in the final output was
console.log(bundle.outputFiles[0].text)
`
// localModule:. /foo
var Foo = FC(() => {
return /* #__PURE__ */ React.createElement("div", null, "gyron");
});
`
console.log(bundle.outputFiles[1])
`
undefined
`

Answer 1

I have just tried setting treeShaking to false and can pack the app into the product.