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Title: Fix type variable leaks and cache inconsistencies by ahejlsberg · Pull Request #61668 · microsoft/TypeScript · GitHub

Open Graph Title: Fix type variable leaks and cache inconsistencies by ahejlsberg · Pull Request #61668 · microsoft/TypeScript

X Title: Fix type variable leaks and cache inconsistencies by ahejlsberg · Pull Request #61668 · microsoft/TypeScript

Description: TypeScript is a superset of JavaScript that compiles to clean JavaScript output. - Fix type variable leaks and cache inconsistencies by ahejlsberg · Pull Request #61668 · microsoft/TypeScript

Open Graph Description: This PR fixes two issues leading to type variable leaks and cache inconsistencies. The first issue, reported in #59937, relates to instantiations of single-signature types with inferred type parame...

X Description: This PR fixes two issues leading to type variable leaks and cache inconsistencies. The first issue, reported in #59937, relates to instantiations of single-signature types with inferred type parame...

Opengraph URL: https://github.com/microsoft/TypeScript/pull/61668

X: @github

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Domain: github.com

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Type inference regression on function calls not saved to variables, due to #61668 #62071 https://github.com/microsoft/TypeScript/issues/62071
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Revert PR 61668 #62158 https://github.com/microsoft/TypeScript/pull/62158
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Add tests for contextual param type assignment in nested return type inference scenarios #62189 https://github.com/microsoft/TypeScript/pull/62189
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code working in TypeScript 5.8https://www.typescriptlang.org/play/?target=6&jsx=0&ts=5.8.3#code/JYWwDg9gTgLgBAbzhARgZwKZQG4EMUA2GcAvnAGZQQhwBEIqAHrQNwBQbGjkscwAdjCzlcAY2IBBMGALBRuGMAj9EbOOrhQMuACbKCATzi5pASR0AuOGhhQBAc3YbN2vf0NwduYIYnYsuPYYAKpogRhWNnb8jmoaWrr6RjAQMLgEoeGRtg7sJBxcPPACQlAi4nAAIt6+0rLyisqZQdVpqs4Jbh5eQtnRsR2uSZ64BgDy5ADqGBgA1n25ceqdwwCuYUELMXkF3NDFgsJiknVyCkr8zRituO3xQ+5GYFrkWFo6UmDmWwP3iY8jHwGPwBIJXH5OP5dIxeIGfernJobDBoKwrAHVOGnBoXK43ADaAF0dpw9rwdBhRARcFoKKt+KJGipRAkhJ8AEoYIoAChMX0s1hyMQANIDfP4oOFwYL+qLYbUZGcmVdUS5-h5MQqEcrkQTCQBKKzwpUXdhsUTKGxwFnaNnSTlFACyJkdqAAGnAALxwbk9XBoh4eY04pHhPX6r0APjuywwMFWUBUqEwOHwRAAdCATNyls4RmlM9m+VG4Pjc3mNHz088MK8oO9PuZheWK9bWRgOVz9rzpNWXm8MB8zDpRVX5cCJVLkaPe+Pg4jLsi0PqW+oDfq8maLfwrTaFB37V3YM6wAAFakCL0+v0B9VGec6sMKXBEiOe6MIXNaeOJuD8DAAO5wCeOatvmuCFmAPZgCWZZgc4VY1nWDbDs28EaHudpgA63aIf29aDo2I7GLONQTqCITTiRYDpnO2ILiqK5geum5sEAA
same code in TypeScript 5.9https://www.typescriptlang.org/play/?target=6&jsx=0&ts=5.9.2#code/JYWwDg9gTgLgBAbzhARgZwKZQG4EMUA2GcAvnAGZQQhwBEIqAHrQNwBQbGjkscwAdjCzlcAY2IBBMGALBRuGMAj9EbOOrhQMuACbKCATzi5pASR0AuOGhhQBAc3YbN2vf0NwduYIYnYsuPYYAKpogRhWNnb8jmoaWrr6RjAQMLgEoeGRtg7sJBxcPPACQlAi4nAAIt6+0rLyisqZQdVpqs4Jbh5eQtnRsR2uSZ64BgDy5ADqGBgA1n25ceqdwwCuYUELMXkF3NDFgsJiknVyCkr8zRituO3xQ+5GYFrkWFo6UmDmWwP3iY8jHwGPwBIJXH5OP5dIxeIGfernJobDBoKwrAHVOGnBoXK43ADaAF0dpw9rwdBhRARcFoKKt+KJGipRAkhJ8AEoYIoAChMX0s1hyMQANIDfP4oOFwYL+qLYbUZGcmVdUS5-h5MQqEcrkQTCQBKKzwpUXdhsUTKGxwFnaNnSTlFACyJkdqAAGnAALxwbk9XBoh4eY04pHhPX6r0APjuywwMFWUBUqEwOHwRAAdCATNyls4RmlM9m+VG4Pjc3mNHz088MK8oO9PuZheWK9bWRgOVz9rzpNWXm8MB8zDpRVX5cCJVLkaPe+Pg4jLsi0PqW+oDfq8maLfwrTaFB37V3YM6wAAFakCL0+v0B9VGec6sMKXBEiOe6MIXNaeOJuD8DAAO5wCeOatvmuCFmAPZgCWZZgc4VY1nWDbDs28EaHudpgA63aIf29aDo2I7GLONQTqCITTiRYDpnO2ILiqK5geum5sEAA
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Circular references types may break on TS 5.9 Atrocit/farstorm#1 https://github.com/Atrocit/farstorm/issues/1
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Port TS PR 61668 - Fix type variable leaks and cache inconsistencies microsoft/typescript-go#1795 https://github.com/microsoft/typescript-go/pull/1795
Predicate.struct with generic refinements broken in TypeScript 5.9 Effect-TS/effect#6027 https://github.com/Effect-TS/effect/issues/6027
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