Linaria shaker shaking exported value with exports

[ling1726]

Environment

• Linaria version: @linaria/babel-preset@3.0.0-beta.7, @linaria/shaker@3.0.0-beta.8
• Bundler (+ version): N/A
• Node.js version: 12.18.4 (Ubuntu)
• OS: Windows 10, Ubuntu 20.04 LTS on WSL

Description

We use @linaria/babel-preset & @linaria/shaker for our CSS-in-JS in Fluent UI. Please check out the reproducible demo on stackblitz. for code examples.

One of the Typescript targets we build is common-js. It seems that Linaria cannot handle reuse of exported functions with exports because they are getting shaken by the shaker

// 👇👇👇 This is getting shaken by the shaker
var bar = function () { return 'hello world'; }
exports.bar= bar;

// 👇👇👇 This will fail because `exports.bar` is not  a function
exports.foo = exports.bar();

It seems that Linaria is shaking the exported function and the final result is smth like this:

exports.foo = exports.bar();

Reproducible Demo

https://stackblitz.com/edit/node-ptrjmt

$ node using-babel.js

fixtureName passing
hello world

fixtureName failing
hello world

$ node using-shaker.js

fixtureName passing
hello world

fixtureName passing
hello world

TypeError: exports.bar is not a function
    at eval (/home/projects/node-ptrjmt/src/failing/foo.js:5:23)
    at eval (/home/projects/node-ptrjmt/src/failing/foo.js:6:3)
    at Proxy.<anonymous> (https://node-ptrjmt.jw.staticblitz.com/blitz.84452ea99b8c6a79e19cae2129beaf85d5da007c.js:8:17496)
    at __global_eval__ (https://node-ptrjmt.jw.staticblitz.com/blitz.84452ea99b8c6a79e19cae2129beaf85d5da007c.js:8:17707)
    at _0x23e309 (https://node-ptrjmt.jw.staticblitz.com/blitz.84452ea99b8c6a79e19cae2129beaf85d5da007c.js:11:175606)
    at Script.runInContext (https://node-ptrjmt.jw.staticblitz.com/blitz.84452ea99b8c6a79e19cae2129beaf85d5da007c.js:11:175161)
    at Script.runInContext (https://node-ptrjmt.jw.staticblitz.com/blitz.84452ea99b8c6a79e19cae2129beaf85d5da007c.js:6:401168)
    at Module.evaluate (/home/projects/node-ptrjmt/node_modules/@linaria/babel-preset/lib/module.js:293:12)
    at Proxy.Module.Object.assign.ensure (/home/projects/node-ptrjmt/node_modules/@linaria/babel-preset/lib/module.js:197:15)
    at eval (/home/projects/node-ptrjmt/src/failing/index.js:9:11)