Optional Chaining: unable to apply further transforms to certain function call arguments

[microbouji]

Bug Report

Current Behavior
The following input code throws "Container is falsy"

Input Code

a?.b(2 ** 3)

Expected behavior/code

(_a = a) === null || _a === void 0 ? void 0 : _a.b(Math.pow(2, 3));

Babel Configuration (.babelrc, package.json, cli command)

{
  "plugins": [
    "@babel/transform-exponentiation-operator",
    "@babel/proposal-optional-chaining"
  ]
}

Order doesn't matter.

Environment

• Babel version(s): v7.0.0-beta.51
• Node/npm version: Node 8.10.0 / npm 5.6.0
• OS: Ubuntu 16.04
• Monorepo [e.g. yes/no/Lerna]
• How you are using Babel: [e.g. cli, register, loader]

Possible Solution

Additional context/Screenshots
a?.(2 ** 3) works fine. So I think it only happens when the result of findReplacementPath is not the same as path itself in https://github.com/babel/babel/blob/master/packages/babel-plugin-proposal-optional-chaining/src/index.js#L138

The exponentiation operator is just one case. It also throws with template literals for example

a?.b(`foo`)

Looks like it might be a caching thing. While debugging with the node debugger, the path that transform-template-literals was trying to replace had indeed container set to null but it fixed itself after I ran something like parentPath.get('arguments') or similar in the debug console just to see what was going on.

[babel-bot]

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so it's possible this won't be addressed swiftly.

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[microbouji]

Closing this as it's working now. Was most probably fixed by #9073.