Support allowJs customization in the rollup executor

[fsmaia]

• I'd be willing to implement this feature (contributing guide)

Description

I would like to see tsconfig.json#compilerOptions.allowJs configuration support for the rollup executor, currently, it is hardcoded as false.

Motivation

This flag allows us to produce typings from JS files and import JS files in TS files, which is very useful when migrating large JS repository files to TypeScript gradually.

Suggested Implementation

Keep false as the default value, but use the configured tsconfig.json value when present.

Alternate Implementations

Actually, I would need to understand why it's hardcoded so I can be able to discuss alternate implementations.

[fsmaia]

It seems this flag has been hardcoded since its first implementation:
#1907

@jaysoo, @vsavkin, any hints on why it's hardcoded?

[fsmaia]

Up

[fsmaia]

Am I missing something on the issue template or some important info?
Can't believe this hasn't been even replied and it's very common to have hybrid libraries (TS+JS), which currently can't use the rollup executor!

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