Deep intersections stopped working in 4.9

[SephReed]

Bug Report

🔎 Search Terms

Deep union no longer work

🕗 Version & Regression Information

• This is a crash: no
• This changed between versions _4.8 and 4.9
• This is the behavior in every version I tried, and I reviewed the FAQ for entries about yes_
• I was unable to test this on prior versions because tested on prior versions, is regression___

⏯ Playground Link

Playground link with relevant code

💻 Code

type G = { props: (
 { a: { foo: 1 }}
 & { a: { bar: 2 }}
)} & { props: { a: { qux: 3}}}

const g: G = {
 props: {
 a: {
 foo: 1,
 bar: 2,
 qux: 3, // gives error in 4.9, not in 4.8
 }
 }
}

🙁 Actual behavior

qux gives error:

Object literal may only specify known properties

🙂 Expected behavior

Continues working as it had before

[SephReed]

This one still works:

type G = { props: { a: { foo: 1 }}} 
 & { props: { a: { qux: 3}}} 
 & { props: { a: { bar: 2 }}} 

[RyanCavanaugh]

Tracking at #52252 since the PR to fix that one also fixes this one

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.