RFC#562 - {{and}}, {{or}}, {{not}} as keywords

[NullVoxPopuli-ai-agent]

Summary

Implements RFC #562 — adds and, or, not as new helpers and strict-mode keywords.

• Implements three logical helpers as plain functions in @glimmer/runtime
• Uses toBool from @glimmer/global-context for Handlebars truthiness (empty arrays are falsy)
• and returns the first falsy value or the right-most value if all are truthy
• or returns the first truthy value or the right-most value if all are falsy
• not returns the boolean negation of its argument
• Re-exports from @ember/helper with YUIDoc and Opaque type interfaces
• Registers as keywords in the template compiler (strict-mode only, not available in loose mode)
• and/or throw in DEBUG mode if called with fewer than two arguments
• not throws in DEBUG mode if called with more than one argument

New files

• packages/@glimmer/runtime/lib/helpers/{and,or,not}.ts — helper implementations
• packages/@glimmer-workspace/integration-tests/test/keywords/{and,or,not}-test.ts — tests with explicit scope
• packages/@glimmer-workspace/integration-tests/test/keywords/{and,or,not}-runtime-test.ts — runtime keyword tests

Modified files

• packages/@glimmer/runtime/index.ts — exports
• packages/@ember/helper/index.ts — re-exports with docs
• packages/@ember/template-compiler/lib/compile-options.ts — keyword registration
• packages/@ember/template-compiler/lib/plugins/auto-import-builtins.ts — AST rewriting

Test plan

• and: returns right-most truthy, first falsy, empty array as falsy
• or: returns first truthy, right-most falsy, empty array as falsy
• not: negates truthy/falsy, works as MustacheStatement
• Runtime keyword tests (explicit scope, eval)
• DEBUG arity error tests for all three
• Uses Handlebars truthiness (empty arrays are falsy)

🤖 Generated with Claude Code

[NullVoxPopuli]

this test should be split in to 3 files, one for and, one for or, and one for not

[NullVoxPopuli]

same split here

[NullVoxPopuli]

this can just be a simple function -- we don't need to use internalHelper, createComputeRef, or valueForRef.

we can do:

export const and = (...args: unknown[]) => args.every(Boolean);

the same shortcut/shorthand can be used for all of these functions