* init

* add comment

* make error more actionable

* init

* empty commit to start google testing

* [gen_l10n] keys can contain dollar sign

Fixes #112250

* Update packages/flutter_tools/lib/src/localizations/gen_l10n.dart
Co-authored-by: Christopher Fujino <fujino@google.com>

* init

* fix tests

* fix lint

* extra changes

* oops missed some merge conflicts

* fix lexer add tests

* consistent warnings and errors

* throw error at the end

* improve efficiency, improve code generation

* fix

* nit

* fix test

* remove helper method class

* two d's

* oops

* empty commit as google testing won't pass :(

* init

* make more descriptive

* fix lint

* init

* more fixing

* finish

* fix lint

* address pr comments

* redo checks

* init

* code generation

* improve syntax error, add tests

* add tests and fix bugs

* code generation fix

* fix all tests :)

* fix bug

* init

* fix all code gen issues

* FIXED ALL TESTS :D

* add license

* remove trailing spaces

* remove print

* tests fix

* specify type annotation

* fix test

* lint

* fix todos

* fix subclass issues

* final fix; flutter gallery runs

* escaping for later pr

* fix comment

* address PR comments

* more

* more descriptive errors

* last fixes

This reverts commit f8f69575.

* Migrate packages/flutter_tools/bin

* Fix NPE

* Fix test

* Fix test

* Fix l10n optionalParameters

* Fix ChromeTab nullability

* Fix another type cast error

* Fix another cast error

* Fix another cast error (copied from #110711)

* Fix NPE

* Fix another NPE

* Assert that testDirectory is not null

* init

* fix

* fix 2

* fix 3

* tests

* fix tests

* clarify help text

* fix all tests

* fix formatting?

* add second test

* unused import

* remove print

* trailing spaces

* artifacts is never null

* fix

[gen_l10n] Warn users when placeholder types are converted to 'num' when using pluralization (#108036)

* init

* asdf

* fix tests

* change warning slightly

* fix test again

* fix spacing and comment

* fix lint

This reverts commit 16f44118.

This reverts commit 5fd259be.

This reverts commit 2be0d57f.

This reverts commit 9846fa51.