[cpruijsen]

Summary

• {#each (Object.entries(modes) as [Mode, string][]) as [id, name]} was printed as {#each Object.entries(modes) as [Mode, string][] as [id, name]}. The compiler drops grouping parentheses from the each-block expression AST, and Prettier then omits them as unnecessary in JS, so the TypeScript as is concatenated into the {#each} as context keyword.
• Wrap {#each} expressions whose AST type is TSAsExpression so the assertion stays parenthesized.
• Fixes Formatter removes parentheses from the each block types #486.

Decision

• Chose: wrap when node.expression.type === 'TSAsExpression'.
• Alternative: preserve every user-written grouping parenthesis around each-block expressions (or also wrap satisfies / angle-bracket assertions).
• Why: same idea as {#each (a, b) as item}, only wrap when {#each}'s as would otherwise collide with TypeScript as. Sequence expressions already get parens from Prettier; TSAsExpression is the hole. Happy to widen the predicate if you want that.

The bind:value={((x as T).y as U).z} case from the issue comment is already handled by the existing bind: parentheses fix (#501 / #503); this PR does not change that path.

Test plan

• test/printer/samples/each-block-type-assertion.html fails without the wrap and passes with it
• Existing {#each} printer samples, typescript-template, and pnpm test still pass

[cpruijsen]

Closing this. Not something I'm going to keep current.