[declarations] not working as expected

[nishant-dani]

Flow version:
"flow-bin": "^0.100.0",

Expected behavior

I have the following declarations tag in .flowconfig
[declarations]
./node_modules/.
./graphql-iso-date/.
I am expecting to see no flow type errors in the following file:
node_modules/graphql-iso-date/dist/time/index.js.flow

Actual behavior

Flow throws a lot of errors in that file, disregarding the declarations tag. I was unable to setup a repro on flow try because there appeared to be no way to setup a .flowconfig file.

• Link to Try-Flow or Github repo:

[nishant-dani]

I had to add a line feed after
./graphql-iso-date/.

[nishant-dani]

The problem is still occuring. The line -feed did not help, it only went away temporarily but the problem has surfaced again.

[FezVrasta]

I can confirm [declarations] seems to be completely broken on 0.100.0

[mroch]

@FezVrasta does it work on previous versions?

[mroch]

wondering if it could be the same as #6717

[FezVrasta]

No it's definitely a different issue. I didn't have time to test a previous version, I'll give it a shot tomorrow

[FezVrasta]

@mroch please try this repro out:

git clone git@github.com:FezVrasta/flow-issue-repro-7803.git
cd flow-issue-repro-7803
yarn --frozen-lockfile
$(yarn bin)/flow

You should see errors coming from @emotion/core even if the Flow configuration is:

[declarations]
<PROJECT_ROOT>/node_modules/.*

I tried even with Flow 0.90.0 and 0.99.0 and I got the same issue.

Most of the errors are because of #6717, but there are some where a $FlowFixMe comment is absent and still throws error:

Error ┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈ node_modules/@emotion/cache/src/index.js:237:7

Cannot call StyleSheet with object literal bound to options because possibly uninitialized variable [1] is incompatible
with HTMLElement [2] in property container.

     node_modules/@emotion/cache/src/index.js
 [1]  67│   let container: HTMLElement
        :
     232│
     233│   const cache: EmotionCache = {
     234│     key,
     235│     sheet: new StyleSheet({
     236│       key,
     237│       container,
     238│       nonce: options.nonce,
     239│       speedy: options.speedy
     240│     }),
     241│     nonce: options.nonce,
     242│     inserted,
     243│     registered: {},

     node_modules/@emotion/sheet/src/index.js
 [2]  45│   container: HTMLElement,

[FezVrasta]

@mroch did you ever find time to take a look at my repro?