when tsconfig specifies `inlineSourceMap: true` then no sourcemap is generated

What happens and why it is wrong

in my tsconfig.json I have inlineSourceMap: true. I also configured rollup to use sourcemap: 'inline'. Rollup builds occur without issue, but my resultant .js file contained an inline sourcemap for non-ts assets only. After much experimentation I found that I can re-enable sourceMaps for TS with the following configuration:

    typescript({
        tsconfigOverride: {
            compilerOptions: {
                sourceMap: true,
                inlineSourceMap: false,

This is not intuitive. I’ve already expressed that I want sourcemaps, and that I want rollup to generate an inline sourcemap. The plugin should ideally respect the inlineSourceMap option in tsconfig.json.

If this is not feasible [likely because it’s hard to scrape out inline source maps from tsc output] then there should be an error displayed and rollup should fail, telling the user they must disable inlineSourceMap and enable sourceMap in their typescript overrides.

Environment

Not relevant

Versions

• typescript: 2.7.2
• rollup: 0.57.1
• rollup-plugin-typescript2: 0.12.0

rollup.config.js

I’m only including the relevant portion.

Original:

    typescript({
        tsconfigOverride: {
            compilerOptions: {
                module: "ES2015"
            }
        }
    }),

With Workaround:

    typescript({
        tsconfigOverride: {
            compilerOptions: {
                sourceMap: true,
                inlineSourceMap: false,
                module: "ES2015"
            }
        }
    }),

tsconfig.json

{
	"compilerOptions": {
		// ...
		"inlineSourceMap": true,
		// ...
	},
        // ...
}

[lolgesten]

My use case is developer mode with rollup:

• rollup-plugin-typescript2 + rollup format: 'es' and preserveModules: false
• use <script type="module" to load modules from page.

With inlineSourceMaps: true I can get my typescript source also in this dev mode, but the force setting to false means I need to use the OP override.

@ezolenko care to elaborate why forcing inlineSourceMap to false would be wanted behavior?

[ezolenko]

inlineSourceMap looks like another candidate for being forcefully overridden to false. I don’t think there is a valid case where it being set to true would do anything useful.