diff --git a/lib/index.mjs b/lib/index.mjs
index c988be20..bd54c4a3 100644
--- a/lib/index.mjs
+++ b/lib/index.mjs
@@ -9,6 +9,8 @@ export const AsyncCompiler = sass.AsyncCompiler;
 export const Compiler = sass.Compiler;
 export const initAsyncCompiler = sass.initAsyncCompiler;
 export const initCompiler = sass.initCompiler;
+export const deprecations = sass.deprecations;
+export const Version = sass.Version;
 export const Logger = sass.Logger;
 export const CalculationInterpolation = sass.CalculationInterpolation;
 export const CalculationOperation = sass.CalculationOperation;
@@ -86,6 +88,14 @@ export default {
     defaultExportDeprecation();
     return sass.Compiler;
   },
+  get deprecations() {
+    defaultExportDeprecation();
+    return sass.deprecations;
+  },
+  get Version() {
+    defaultExportDeprecation();
+    return sass.Version;
+  },
   get Logger() {
     defaultExportDeprecation();
     return sass.Logger;
diff --git a/lib/index.ts b/lib/index.ts
index da4965d5..96ce209b 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -35,6 +35,13 @@ export {
 } from './src/compile';
 export {initAsyncCompiler, AsyncCompiler} from './src/compiler/async';
 export {initCompiler, Compiler} from './src/compiler/sync';
+export {
+  deprecations,
+  Deprecation,
+  DeprecationOrId,
+  DeprecationStatus,
+  Version,
+} from './src/deprecations';
 export {render, renderSync} from './src/legacy';
 
 export const info = `sass-embedded\t${pkg.version}`;
diff --git a/lib/src/compiler/utils.ts b/lib/src/compiler/utils.ts
index 135de80f..09fa031d 100644
--- a/lib/src/compiler/utils.ts
+++ b/lib/src/compiler/utils.ts
@@ -4,6 +4,7 @@
 
 import * as p from 'path';
 import * as supportsColor from 'supports-color';
+import {deprecations, getDeprecationIds, Deprecation} from '../deprecations';
 import {deprotofySourceSpan} from '../deprotofy-span';
 import {Dispatcher, DispatcherHandlers} from '../dispatcher';
 import {Exception} from '../exception';
@@ -75,6 +76,9 @@ function newCompileRequest(
     verbose: !!options?.verbose,
     charset: !!(options?.charset ?? true),
     silent: options?.logger === Logger.silent,
+    fatalDeprecation: getDeprecationIds(options?.fatalDeprecations ?? []),
+    silenceDeprecation: getDeprecationIds(options?.silenceDeprecations ?? []),
+    futureDeprecation: getDeprecationIds(options?.futureDeprecations ?? []),
   });
 
   switch (options?.style ?? 'expanded') {
@@ -137,6 +141,13 @@ export function newCompileStringRequest(
   return request;
 }
 
+/** Type guard to check that `id` is a valid deprecation ID. */
+function validDeprecationId(
+  id: string | number | symbol | undefined
+): id is keyof typeof deprecations {
+  return !!id && id in deprecations;
+}
+
 /** Handles a log event according to `options`. */
 export function handleLogEvent(
   options: OptionsWithLegacy<'sync' | 'async'> | undefined,
@@ -148,6 +159,9 @@ export function handleLogEvent(
   if (options?.legacy) message = removeLegacyImporter(message);
   let formatted = event.formatted;
   if (options?.legacy) formatted = removeLegacyImporter(formatted);
+  const deprecationType = validDeprecationId(event.deprecationType)
+    ? deprecations[event.deprecationType]
+    : null;
 
   if (event.type === proto.LogEventType.DEBUG) {
     if (options?.logger?.debug) {
@@ -159,10 +173,18 @@ export function handleLogEvent(
     }
   } else {
     if (options?.logger?.warn) {
-      const params: {deprecation: boolean; span?: SourceSpan; stack?: string} =
-        {
-          deprecation: event.type === proto.LogEventType.DEPRECATION_WARNING,
-        };
+      const params: (
+        | {
+            deprecation: true;
+            deprecationType: Deprecation;
+          }
+        | {deprecation: false}
+      ) & {
+        span?: SourceSpan;
+        stack?: string;
+      } = deprecationType
+        ? {deprecation: true, deprecationType: deprecationType}
+        : {deprecation: false};
       if (span) params.span = span;
 
       const stack = event.stackTrace;
diff --git a/lib/src/deprecations.ts b/lib/src/deprecations.ts
new file mode 100644
index 00000000..7fe782d3
--- /dev/null
+++ b/lib/src/deprecations.ts
@@ -0,0 +1,173 @@
+// Copyright 2024 Google LLC. Use of this source code is governed by an
+// MIT-style license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
+import * as api from './vendor/sass';
+
+export {Deprecation, DeprecationOrId, DeprecationStatus} from './vendor/sass';
+
+export class Version implements api.Version {
+  constructor(
+    readonly major: number,
+    readonly minor: number,
+    readonly patch: number
+  ) {}
+  static parse(version: string): Version {
+    const match = version.match(/^(\d+)\.(\d+)\.(\d+)$/);
+    if (match === null) {
+      throw new Error(`Invalid version ${version}`);
+    }
+    return new Version(
+      parseInt(match[1]),
+      parseInt(match[2]),
+      parseInt(match[3])
+    );
+  }
+}
+
+/**
+ * Returns whether the given deprecation was active in the given version.
+ */
+function isActiveIn(deprecation: api.Deprecation, version: Version) {
+  const deprecatedIn = deprecation.deprecatedIn;
+  if (deprecation.status !== 'active' || !deprecatedIn) return false;
+  if (version.major > deprecatedIn.major) return true;
+  if (version.major < deprecatedIn.major) return false;
+  if (version.minor > deprecatedIn.minor) return true;
+  if (version.minor < deprecatedIn.minor) return false;
+  return version.patch >= deprecatedIn.patch;
+}
+
+/**
+ * Converts a mixed array of deprecations, IDs, and versions to an array of IDs
+ * that's ready to include in a CompileRequest.
+ */
+export function getDeprecationIds(
+  arr: (api.DeprecationOrId | Version)[]
+): string[] {
+  return arr.flatMap(item => {
+    if (item instanceof Version) {
+      return Object.values(deprecations)
+        .filter(deprecation => isActiveIn(deprecation, item))
+        .map(deprecation => deprecation.id);
+    } else if (typeof item === 'string') {
+      return item;
+    }
+    return item.id;
+  });
+}
+
+export const deprecations: typeof api.deprecations = {
+  'call-string': {
+    id: 'call-string',
+    status: 'active',
+    deprecatedIn: new Version(0, 0, 0),
+    obsoleteIn: null,
+    description: 'Passing a string directly to meta.call().',
+  },
+  elseif: {
+    id: 'elseif',
+    status: 'active',
+    deprecatedIn: new Version(1, 3, 2),
+    obsoleteIn: null,
+    description: '@elseif.',
+  },
+  'moz-document': {
+    id: 'moz-document',
+    status: 'active',
+    deprecatedIn: new Version(1, 7, 2),
+    obsoleteIn: null,
+    description: '@-moz-document.',
+  },
+  'relative-canonical': {
+    id: 'relative-canonical',
+    status: 'active',
+    deprecatedIn: new Version(1, 14, 2),
+    obsoleteIn: null,
+  },
+  'new-global': {
+    id: 'new-global',
+    status: 'active',
+    deprecatedIn: new Version(1, 17, 2),
+    obsoleteIn: null,
+    description: 'Declaring new variables with !global.',
+  },
+  'color-module-compat': {
+    id: 'color-module-compat',
+    status: 'active',
+    deprecatedIn: new Version(1, 23, 0),
+    obsoleteIn: null,
+    description:
+      'Using color module functions in place of plain CSS functions.',
+  },
+  'slash-div': {
+    id: 'slash-div',
+    status: 'active',
+    deprecatedIn: new Version(1, 33, 0),
+    obsoleteIn: null,
+    description: '/ operator for division.',
+  },
+  'bogus-combinators': {
+    id: 'bogus-combinators',
+    status: 'active',
+    deprecatedIn: new Version(1, 54, 0),
+    obsoleteIn: null,
+    description: 'Leading, trailing, and repeated combinators.',
+  },
+  'strict-unary': {
+    id: 'strict-unary',
+    status: 'active',
+    deprecatedIn: new Version(1, 55, 0),
+    obsoleteIn: null,
+    description: 'Ambiguous + and - operators.',
+  },
+  'function-units': {
+    id: 'function-units',
+    status: 'active',
+    deprecatedIn: new Version(1, 56, 0),
+    obsoleteIn: null,
+    description: 'Passing invalid units to built-in functions.',
+  },
+  'duplicate-var-flags': {
+    id: 'duplicate-var-flags',
+    status: 'active',
+    deprecatedIn: new Version(1, 62, 0),
+    obsoleteIn: null,
+    description: 'Using !default or !global multiple times for one variable.',
+  },
+  'null-alpha': {
+    id: 'null-alpha',
+    status: 'active',
+    deprecatedIn: new Version(1, 62, 3),
+    obsoleteIn: null,
+    description: 'Passing null as alpha in the JS API.',
+  },
+  'abs-percent': {
+    id: 'abs-percent',
+    status: 'active',
+    deprecatedIn: new Version(1, 65, 0),
+    obsoleteIn: null,
+    description: 'Passing percentages to the Sass abs() function.',
+  },
+  'fs-importer-cwd': {
+    id: 'fs-importer-cwd',
+    status: 'active',
+    deprecatedIn: new Version(1, 73, 0),
+    obsoleteIn: null,
+    description:
+      'Using the current working directory as an implicit load path.',
+  },
+  import: {
+    id: 'import',
+    status: 'future',
+    deprecatedIn: null,
+    obsoleteIn: null,
+    description: '@import rules.',
+  },
+  'user-authored': {
+    id: 'user-authored',
+    status: 'user',
+    deprecatedIn: null,
+    obsoleteIn: null,
+  },
+};
diff --git a/lib/src/importer-registry.ts b/lib/src/importer-registry.ts
index 7208950a..9a1cb337 100644
--- a/lib/src/importer-registry.ts
+++ b/lib/src/importer-registry.ts
@@ -21,12 +21,12 @@ export class NodePackageImporter {
     entryPointDirectory = entryPointDirectory
       ? p.resolve(entryPointDirectory)
       : require.main?.filename
-      ? p.dirname(require.main.filename)
-      : // TODO: Find a way to use `import.meta.main` once
-      // https://github.com/nodejs/node/issues/49440 is done.
-      process.argv[1]
-      ? createRequire(process.argv[1]).resolve(process.argv[1])
-      : undefined;
+        ? p.dirname(require.main.filename)
+        : // TODO: Find a way to use `import.meta.main` once
+          // https://github.com/nodejs/node/issues/49440 is done.
+          process.argv[1]
+          ? createRequire(process.argv[1]).resolve(process.argv[1])
+          : undefined;
     if (!entryPointDirectory) {
       throw new Error(
         'The Node package importer cannot determine an entry point ' +
diff --git a/lib/src/legacy/importer.ts b/lib/src/legacy/importer.ts
index 791cfc12..97ef9117 100644
--- a/lib/src/legacy/importer.ts
+++ b/lib/src/legacy/importer.ts
@@ -216,8 +216,8 @@ export class LegacyImporterWrapper<sync extends 'sync' | 'async'>
       const syntax = canonicalUrl.pathname.endsWith('.sass')
         ? 'indented'
         : canonicalUrl.pathname.endsWith('.css')
-        ? 'css'
-        : 'scss';
+          ? 'css'
+          : 'scss';
 
       let contents =
         this.lastContents ??
diff --git a/package.json b/package.json
index bb6ff25a..f64b8eb6 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "sass-embedded",
   "version": "1.72.0",
-  "protocol-version": "2.5.0",
+  "protocol-version": "2.6.0",
   "compiler-version": "1.72.0",
   "description": "Node.js library that communicates with Embedded Dart Sass using the Embedded Sass protocol",
   "repository": "sass/embedded-host-node",