`allowJs` and `outDir` `compilerOptions` -- need to set plugin `include`

I am using tsc to transpile ES6 javascript to ES5, by using

compilerOptions: {
        "allowJs": true,
        "outDir": "./build",
      // ...
},

In my rollup.config.js, I have input: 'build/index.js', My build script is then tsc && rollup -c. This seems to work fine.

I would like to be able to use rollup-plugin-typescript2, rather than calling tsc on the command line, but rollup-plugin-typescript2 seems to disallow the outDir option. The docs say this option is forced. “outDir: process.cwd()”. Would it be possible to support this workflow with rollup-plugin-typescript2?

[ezolenko]

To find node modules and make them visible to rollup you need rollup-plugin-node-resolve and rollup-plugin-commonjs plugins.

import resolve from "rollup-plugin-node-resolve";
import commonjs from "rollup-plugin-commonjs";

// ...
	plugins: [
		resolve({ jsnext: true, preferBuiltins: true }),
		commonjs({ include: "node_modules/**" }),
		typescript({ include: ["*.js", "**/*.js"] }),

For outDir you should be able to keep it at any value you want (if you want to be able to run tsc independently from rollup) and plugin will override it when tsconfig.json is used in rollup. Try that and let me know if there are related errors emitted by the plugin itself.

[ezolenko]

Yeah, rollup-plugin-typescript2 doesn’t write out individual transpiled files (if you ignore cache), it just passes code back to rollup and that rolls them into the bundle.

If you change your rollup config to input: './index.js', and pass { include: ["*.js", "**/*.js"] } as plugin options, then everything would probably work.