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## Motivation As part of its OKRs (Q2 2024 O3KR4, Q3 2024 O2KR4) the Wallet Framework Team has upgraded all core packages to use TypeScript v5.0, and is enabling other packages throughout our codebase to upgrade as well. Unblocking the snaps monorepo is a high priority, as it has close interdependencies with core monorepo. This commit upgrades the TypeScript version used in the snaps monorepo by two major versions: v4.9 and v5.0. - https://devblogs.microsoft.com/typescript/announcing-typescript-4-9/ - https://devblogs.microsoft.com/typescript/announcing-typescript-5-0/ ## Features ### `v4.9` - [`satisfies` operator](https://devblogs.microsoft.com/typescript/announcing-typescript-4-9/#the-satisfies-operator) - See MetaMask/core#1972 - [Unlisted property narrowing with `in` operator](https://devblogs.microsoft.com/typescript/announcing-typescript-4-9/#in-narrowing) ### `v5.0` - [`const` Type Parameters](https://devblogs.microsoft.com/typescript/announcing-typescript-5-0/#const-type-parameters): - Causes `as const` inference by default. - 77 `as const` instances in the snaps monorepo. ```ts type HasNames = { names: readonly string[] }; function getNamesExactly<const T extends HasNames>(arg: T): T["names"] { // ^^^^^ return arg.names; } // Inferred type without `const`: string[] // Inferred type with `const`: readonly ["Alice", "Bob", "Eve"] // Note: Didn't need to write 'as const' here const names = getNamesExactly({ names: ["Alice", "Bob", "Eve"] }); ``` - `enum` improvements: - [All `enum`s are union `enum`s](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-5-0.html#all-enums-are-union-enums) - [`enum` overhaul](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-5-0.html#enum-overhaul) - 30 `enum` instances in the snaps monorepo. - Decorators ## Breaking Changes ### `v5.0` - Full list of breaking changes and deprecations: https://devblogs.microsoft.com/typescript/announcing-typescript-5-0/#breaking-changes-and-deprecations - Regressions in Snaps repo - [Forbidden Implicit Coercions in Relational Operators](https://devblogs.microsoft.com/typescript/announcing-typescript-5-0/#forbidden-implicit-coercions-in-relational-operators) - Fixed here: fffe4b2
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