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perf(material/core): speed up M3 compilation #29009

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May 7, 2024
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perf(material/core): speed up M3 compilation #29009

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41 changes: 27 additions & 14 deletions src/material/core/tokens/_m3-tokens.scss
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,32 @@
);
}

$_cached-token-slots: null;

/// Determines the token slots for all components.
@function _get-token-slots() {
// Cache the slots since they're constant and calculating
// them appears to be expensive (see #29009).
@if ($_cached-token-slots) {
@return $_cached-token-slots;
}

// TODO(mmalerba): Refactor this to not depend on the legacy theme when moving out of
// material-experimental. This is a hack for now because there is no good way to get the token
// slots in material-experimental without exposing them all from material.
$fake-theme: m2-theming.define-light-theme((
color: (
primary: m2-theming.define-palette(m2-theming.$red-palette),
accent: m2-theming.define-palette(m2-theming.$red-palette),
warn: m2-theming.define-palette(m2-theming.$red-palette),
),
typography: m2-theming.define-typography-config(),
density: 0
));
$_cached-token-slots: m2-tokens.m2-tokens-from-theme($fake-theme) !global;
@return $_cached-token-slots;
}

/// Generates a set of namespaced tokens for all components.
/// @param {Map} $systems The MDC system tokens
/// @param {Boolean} $include-non-systemized Whether to include non-systemized tokens
Expand All @@ -75,20 +101,7 @@
// DO NOT REMOVE
// This function is used internally.
$systems: format-tokens.private-format-tokens($systems);

// TODO(mmalerba): Refactor this to not depend on the legacy theme when moving out of
// material-experimental. This is a hack for now because there is no good way to get the token
// slots in material-experimental without exposing them all from material.
$fake-theme: m2-theming.define-light-theme((
color: (
primary: m2-theming.define-palette(m2-theming.$red-palette),
accent: m2-theming.define-palette(m2-theming.$red-palette),
warn: m2-theming.define-palette(m2-theming.$red-palette),
),
typography: m2-theming.define-typography-config(),
density: 0
));
$token-slots: m2-tokens.m2-tokens-from-theme($fake-theme);
$token-slots: _get-token-slots();

// TODO(mmalerba): Fill in remaining tokens.
$result: sass-utils.deep-merge-all(
Expand Down