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[MDCCheckbox] Replace unique-id with a deterministic function #5284

jathak opened this issue Nov 27, 2019 · 0 comments


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@jathak jathak commented Nov 27, 2019

Feature Request

mdc-checkbox currently uses the built-in unique-id function when generating keyframes. This function is non-deterministic, which can hurt caching when using mdc-checkbox in a complicated build.

Proposed solution

To make the result of compiling mdc-checkbox deterministic, we can replace this call to unique-id with a call to a user-defined function similar to:

$_next-id: 0 !default;

@function deterministic-unique-id() {
  $_next-id: $_next-id + 1 !global;
  @return u#{$_next-id};

Alternatives considered

An alternative would be to add a method to seed randomness in the Sass compiler (for both unique-id and random) but the main benefit of these functions being something built-in is that they're likely to be unique across compiler runs as well.

Additional context

b/145002342 has internal context on this

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