esbuild not bundling files

I am trying to use esbuild to bundle and minify my files in an npm project. It is minimizing every file that I pass in, but it is not bundling. It gives me the error that I must use ‘outdir’ when there are multiple files. However, this gives me back all of those files, minimized, in a folder. This is not the behavior that I want and is not bundling. I just want it to take all of those files and merge them into one.

let {build} = require("esbuild");
let files = ["file1.js", "file2.js"];

build({
    entryPoints: files,
    outdir: "./views/dashboardPage/bundle",
    minify: true,
    bundle: true
}).catch(() => process.exit(1));

I have bundle set to true, but it still demands that I use outdir and it just returns those files to me, minimized. They have basically 0 documentation on this and every post online about it has just copy/pasted the README from the GitHub. How can I make it bundle?

Answer

Each entry point file will become a separate bundle. Each bundle includes the entry point file and all files it imports. Passing two entry points will create two separate bundles. The bundling process is not the same thing as file concatenation.

If you want all of the files in a single bundle, you can reference them all from a single file and use that file as the entry point:

import "./file1.js"
import "./file2.js"

Doing that with esbuild could look something like this:

let {build} = require("esbuild");
let files = ["./file1.js", "./file2.js"];

build({
    stdin: { contents: files.map(f => `import "${f}"`).join('n') },
    outfile: "./views/dashboardPage/bundle.js",
    minify: true,
    bundle: true
}).catch(() => process.exit(1));