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diff --git a/‎src/compiler/core.ts
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+71-20Lines changed: 71 additions & 20 deletions b/‎src/compiler/core.ts
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+71-20Lines changed: 71 additions & 20 deletions
diff --git a/‎src/compiler/types.ts
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+5Lines changed: 5 additions & 0 deletions b/‎src/compiler/types.ts
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+5Lines changed: 5 additions & 0 deletions
diff --git a/‎src/server/protocol.ts
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+53Lines changed: 53 additions & 0 deletions b/‎src/server/protocol.ts
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+53Lines changed: 53 additions & 0 deletions
diff --git a/‎src/services/codefixes/importFixes.ts
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+14-12Lines changed: 14 additions & 12 deletions b/‎src/services/codefixes/importFixes.ts
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+14-12Lines changed: 14 additions & 12 deletions
@@ -865,32 +865,25 @@ export const enum SortKind {
 }
 
 /** @internal */
-export function detectSortCaseSensitivity(array: readonly string[], useEslintOrdering?: boolean): SortKind;
-/** @internal */
-export function detectSortCaseSensitivity<T>(array: readonly T[], useEslintOrdering: boolean, getString: (element: T) => string): SortKind;
-/** @internal */
-export function detectSortCaseSensitivity<T>(array: readonly T[], useEslintOrdering?: boolean, getString?: (element: T) => string): SortKind {
+export function detectSortCaseSensitivity<T>(
+    array: readonly T[],
+    getString: (element: T) => string,
+    compareStringsCaseSensitive: Comparer<string>,
+    compareStringsCaseInsensitive: Comparer<string>,
+): SortKind {
     let kind = SortKind.Both;
     if (array.length < 2) return kind;
-    const caseSensitiveComparer = getString
-        ? (a: T, b: T) => compareStringsCaseSensitive(getString(a), getString(b))
-        : compareStringsCaseSensitive as (a: T | undefined, b: T | undefined) => Comparison;
-    const compareCaseInsensitive = useEslintOrdering ? compareStringsCaseInsensitiveEslintCompatible : compareStringsCaseInsensitive;
-    const caseInsensitiveComparer = getString
-        ? (a: T, b: T) => compareCaseInsensitive(getString(a), getString(b))
-        : compareCaseInsensitive as (a: T | undefined, b: T | undefined) => Comparison;
-    for (let i = 1, len = array.length; i < len; i++) {
-        const prevElement = array[i - 1];
-        const element = array[i];
-        if (kind & SortKind.CaseSensitive && caseSensitiveComparer(prevElement, element) === Comparison.GreaterThan) {
+
+    let prevElement = getString(array[0]);
+    for (let i = 1, len = array.length; i < len && kind !== SortKind.None; i++) {
+        const element = getString(array[i]);
+        if (kind & SortKind.CaseSensitive && compareStringsCaseSensitive(prevElement, element) > 0) {
             kind &= ~SortKind.CaseSensitive;
         }
-        if (kind & SortKind.CaseInsensitive && caseInsensitiveComparer(prevElement, element) === Comparison.GreaterThan) {
+        if (kind & SortKind.CaseInsensitive && compareStringsCaseInsensitive(prevElement, element) > 0) {
             kind &= ~SortKind.CaseInsensitive;
         }
-        if (kind === SortKind.None) {
-            return kind;
-        }
+        prevElement = element;
     }
     return kind;
 }
@@ -2048,6 +2041,64 @@ export function memoizeWeak<A extends object, T>(callback: (arg: A) => T): (arg:
     };
 }
 
+/** @internal */
+export interface MemoizeCache<A extends any[], T> {
+    has(args: A): boolean;
+    get(args: A): T | undefined;
+    set(args: A, value: T): void;
+}
+
+/**
+ * A version of `memoize` that supports multiple arguments, backed by a provided cache.
+ *
+ * @internal
+ */
+export function memoizeCached<A extends any[], T>(callback: (...args: A) => T, cache: MemoizeCache<A, T>): (...args: A) => T {
+    return (...args: A) => {
+        let value = cache.get(args);
+        if (value === undefined && !cache.has(args)) {
+            value = callback(...args);
+            cache.set(args, value);
+        }
+        return value!;
+    };
+}
+
+/**
+ * High-order function, composes functions. Note that functions are composed inside-out;
+ * for example, `compose(a, b)` is the equivalent of `x => b(a(x))`.
+ *
+ * @param args The functions to compose.
+ *
+ * @internal
+ */
+export function compose<T>(...args: ((t: T) => T)[]): (t: T) => T;
+/** @internal */
+export function compose<T>(a: (t: T) => T, b: (t: T) => T, c: (t: T) => T, d: (t: T) => T, e: (t: T) => T): (t: T) => T {
+    if (!!e) {
+        const args: ((t: T) => T)[] = [];
+        for (let i = 0; i < arguments.length; i++) {
+            args[i] = arguments[i];
+        }
+
+        return t => reduceLeft(args, (u, f) => f(u), t);
+    }
+    else if (d) {
+        return t => d(c(b(a(t))));
+    }
+    else if (c) {
+        return t => c(b(a(t)));
+    }
+    else if (b) {
+        return t => b(a(t));
+    }
+    else if (a) {
+        return t => a(t);
+    }
+    else {
+        return t => t;
+    }
+}
 /** @internal */
 export const enum AssertionLevel {
     None = 0,
 
@@ -9832,6 +9832,11 @@ export interface UserPreferences {
     readonly allowRenameOfImportPath?: boolean;
     readonly autoImportFileExcludePatterns?: string[];
     readonly organizeImportsIgnoreCase?: "auto" | boolean;
+    readonly organizeImportsCollation?: "ordinal" | "unicode";
+    readonly organizeImportsLocale?: string;
+    readonly organizeImportsNumericCollation?: boolean;
+    readonly organizeImportsAccentCollation?: boolean;
+    readonly organizeImportsCaseFirst?: "upper" | "lower" | false;
 }
 
 /** Represents a bigint literal value without requiring bigint support */
 
@@ -3516,7 +3516,60 @@ export interface UserPreferences {
     readonly includeInlayFunctionLikeReturnTypeHints?: boolean;
     readonly includeInlayEnumMemberValueHints?: boolean;
     readonly autoImportFileExcludePatterns?: string[];
+
+    /**
+     * Indicates whether imports should be organized in a case-insensitive manner.
+     */
     readonly organizeImportsIgnoreCase?: "auto" | boolean;
+    /**
+     * Indicates whether imports should be organized via an "ordinal" (binary) comparison using the numeric value
+     * of their code points, or via "unicode" collation (via the
+     * [Unicode Collation Algorithm](https://unicode.org/reports/tr10/#Scope)) using rules associated with the locale
+     * specified in {@link organizeImportsCollationLocale}.
+     *
+     * Default: `"ordinal"`.
+     */
+    readonly organizeImportsCollation?: "ordinal" | "unicode";
+    /**
+     * Indicates the locale to use for "unicode" collation. If not specified, the locale `"en"` is used as an invariant
+     * for the sake of consistent sorting. Use `"auto"` to use the detected UI locale.
+     *
+     * This preference is ignored if {@link organizeImportsCollation} is not `"unicode"`.
+     *
+     * Default: `"en"`
+     */
+    readonly organizeImportsCollationLocale?: string;
+    /**
+     * Indicates whether numeric collation should be used for digit sequences in strings. When `true`, will collate
+     * strings such that `a1z < a2z < a100z`. When `false`, will collate strings such that `a1z < a100z < a2z`.
+     *
+     * This preference is ignored if {@link organizeImportsCollation} is not `"unicode"`.
+     *
+     * Default: `false`
+     */
+    readonly organizeImportsNumericCollation?: boolean;
+    /**
+     * Indicates whether accents and other diacritic marks are considered unequal for the purpose of collation. When
+     * `true`, characters with accents and other diacritics will be collated in the order defined by the locale specified
+     * in {@link organizeImportsCollationLocale}.
+     *
+     * This preference is ignored if {@link organizeImportsCollation} is not `"unicode"`.
+     *
+     * Default: `true`
+     */
+    readonly organizeImportsAccentCollation?: boolean;
+    /**
+     * Indicates whether upper case or lower case should sort first. When `false`, the default order for the locale
+     * specified in {@link organizeImportsCollationLocale} is used.
+     *
+     * This preference is ignored if {@link organizeImportsCollation} is not `"unicode"`. This preference is also
+     * ignored if we are using case-insensitive sorting, which occurs when {@link organizeImportsIgnoreCase} is `true`,
+     * or if {@link organizeImportsIgnoreCase} is `"auto"` and the auto-detected case sensitivity is determined to be
+     * case-insensitive.
+     *
+     * Default: `false`
+     */
+    readonly organizeImportsCaseFirst?: "upper" | "lower" | false;
 
     /**
      * Indicates whether {@link ReferencesResponseItem.lineText} is supported.
 
@@ -375,7 +375,7 @@ function createImportAdderWorker(sourceFile: SourceFile, program: Program, useAu
             newDeclarations = combine(newDeclarations, declarations);
         });
         if (newDeclarations) {
-            insertImports(changeTracker, sourceFile, newDeclarations, /*blankLineBetween*/ true);
+            insertImports(changeTracker, sourceFile, newDeclarations, /*blankLineBetween*/ true, preferences);
         }
     }
 
@@ -1221,14 +1221,14 @@ function codeActionForFixWorker(changes: textChanges.ChangeTracker, sourceFile:
             const defaultImport: Import | undefined = importKind === ImportKind.Default ? { name: symbolName, addAsTypeOnly } : undefined;
             const namedImports: Import[] | undefined = importKind === ImportKind.Named ? [{ name: symbolName, addAsTypeOnly }] : undefined;
             const namespaceLikeImport = importKind === ImportKind.Namespace || importKind === ImportKind.CommonJS ? { importKind, name: symbolName, addAsTypeOnly } : undefined;
-            insertImports(changes, sourceFile, getDeclarations(moduleSpecifier, quotePreference, defaultImport, namedImports, namespaceLikeImport), /*blankLineBetween*/ true);
+            insertImports(changes, sourceFile, getDeclarations(moduleSpecifier, quotePreference, defaultImport, namedImports, namespaceLikeImport), /*blankLineBetween*/ true, preferences);
             return includeSymbolNameInDescription
                 ? [Diagnostics.Import_0_from_1, symbolName, moduleSpecifier]
                 : [Diagnostics.Add_import_from_0, moduleSpecifier];
         }
         case ImportFixKind.PromoteTypeOnly: {
             const { typeOnlyAliasDeclaration } = fix;
-            const promotedDeclaration = promoteFromTypeOnly(changes, typeOnlyAliasDeclaration, compilerOptions, sourceFile);
+            const promotedDeclaration = promoteFromTypeOnly(changes, typeOnlyAliasDeclaration, compilerOptions, sourceFile, preferences);
             return promotedDeclaration.kind === SyntaxKind.ImportSpecifier
                 ? [Diagnostics.Remove_type_from_import_of_0_from_1, symbolName, getModuleSpecifierText(promotedDeclaration.parent.parent)]
                 : [Diagnostics.Remove_type_from_import_declaration_from_0, getModuleSpecifierText(promotedDeclaration)];
@@ -1244,17 +1244,18 @@ function getModuleSpecifierText(promotedDeclaration: ImportClause | ImportEquals
         : cast(promotedDeclaration.parent.moduleSpecifier, isStringLiteral).text;
 }
 
-function promoteFromTypeOnly(changes: textChanges.ChangeTracker, aliasDeclaration: TypeOnlyAliasDeclaration, compilerOptions: CompilerOptions, sourceFile: SourceFile) {
+function promoteFromTypeOnly(changes: textChanges.ChangeTracker, aliasDeclaration: TypeOnlyAliasDeclaration, compilerOptions: CompilerOptions, sourceFile: SourceFile, preferences: UserPreferences) {
     // See comment in `doAddExistingFix` on constant with the same name.
     const convertExistingToTypeOnly = compilerOptions.preserveValueImports && compilerOptions.isolatedModules;
     switch (aliasDeclaration.kind) {
         case SyntaxKind.ImportSpecifier:
             if (aliasDeclaration.isTypeOnly) {
-                const sortKind = OrganizeImports.detectImportSpecifierSorting(aliasDeclaration.parent.elements);
+                const sortKind = OrganizeImports.detectImportSpecifierSorting(aliasDeclaration.parent.elements, preferences);
                 if (aliasDeclaration.parent.elements.length > 1 && sortKind) {
                     changes.delete(sourceFile, aliasDeclaration);
                     const newSpecifier = factory.updateImportSpecifier(aliasDeclaration, /*isTypeOnly*/ false, aliasDeclaration.propertyName, aliasDeclaration.name);
-                    const insertionIndex = OrganizeImports.getImportSpecifierInsertionIndex(aliasDeclaration.parent.elements, newSpecifier, sortKind === SortKind.CaseInsensitive);
+                    const comparer = OrganizeImports.getOrganizeImportsComparer(preferences, sortKind === SortKind.CaseInsensitive);
+                    const insertionIndex = OrganizeImports.getImportSpecifierInsertionIndex(aliasDeclaration.parent.elements, newSpecifier, comparer);
                     changes.insertImportSpecifierAtIndex(sourceFile, newSpecifier, aliasDeclaration.parent, insertionIndex);
                 }
                 else {
@@ -1285,7 +1286,7 @@ function promoteFromTypeOnly(changes: textChanges.ChangeTracker, aliasDeclaratio
         if (convertExistingToTypeOnly) {
             const namedImports = tryCast(importClause.namedBindings, isNamedImports);
             if (namedImports && namedImports.elements.length > 1) {
-                if (OrganizeImports.detectImportSpecifierSorting(namedImports.elements) &&
+                if (OrganizeImports.detectImportSpecifierSorting(namedImports.elements, preferences) &&
                     aliasDeclaration.kind === SyntaxKind.ImportSpecifier &&
                     namedImports.elements.indexOf(aliasDeclaration) !== 0
                 ) {
@@ -1348,36 +1349,37 @@ function doAddExistingFix(
             ignoreCaseForSorting = preferences.organizeImportsIgnoreCase;
         }
         else if (existingSpecifiers) {
-            const targetImportSorting = OrganizeImports.detectImportSpecifierSorting(existingSpecifiers);
+            const targetImportSorting = OrganizeImports.detectImportSpecifierSorting(existingSpecifiers, preferences);
             if (targetImportSorting !== SortKind.Both) {
                 ignoreCaseForSorting = targetImportSorting === SortKind.CaseInsensitive;
             }
         }
         if (ignoreCaseForSorting === undefined) {
-            ignoreCaseForSorting = OrganizeImports.detectSorting(sourceFile) === SortKind.CaseInsensitive;
+            ignoreCaseForSorting = OrganizeImports.detectSorting(sourceFile, preferences) === SortKind.CaseInsensitive;
         }
 
+        const comparer = OrganizeImports.getOrganizeImportsComparer(preferences, ignoreCaseForSorting);
         const newSpecifiers = stableSort(
             namedImports.map(namedImport => factory.createImportSpecifier(
                 (!clause.isTypeOnly || promoteFromTypeOnly) && needsTypeOnly(namedImport),
                 /*propertyName*/ undefined,
                 factory.createIdentifier(namedImport.name))),
-            (s1, s2) => OrganizeImports.compareImportOrExportSpecifiers(s1, s2, ignoreCaseForSorting));
+            (s1, s2) => OrganizeImports.compareImportOrExportSpecifiers(s1, s2, comparer));
 
         // The sorting preference computed earlier may or may not have validated that these particular
         // import specifiers are sorted. If they aren't, `getImportSpecifierInsertionIndex` will return
         // nonsense. So if there are existing specifiers, even if we know the sorting preference, we
         // need to ensure that the existing specifiers are sorted according to the preference in order
         // to do a sorted insertion.
-        const specifierSort = existingSpecifiers?.length && OrganizeImports.detectImportSpecifierSorting(existingSpecifiers);
+        const specifierSort = existingSpecifiers?.length && OrganizeImports.detectImportSpecifierSorting(existingSpecifiers, preferences);
         if (specifierSort && !(ignoreCaseForSorting && specifierSort === SortKind.CaseSensitive)) {
             for (const spec of newSpecifiers) {
                 // Organize imports puts type-only import specifiers last, so if we're
                 // adding a non-type-only specifier and converting all the other ones to
                 // type-only, there's no need to ask for the insertion index - it's 0.
                 const insertionIndex = convertExistingToTypeOnly && !spec.isTypeOnly
                     ? 0
-                    : OrganizeImports.getImportSpecifierInsertionIndex(existingSpecifiers, spec, ignoreCaseForSorting);
+                    : OrganizeImports.getImportSpecifierInsertionIndex(existingSpecifiers, spec, comparer);
                 changes.insertImportSpecifierAtIndex(sourceFile, spec, clause.namedBindings as NamedImports, insertionIndex);
             }
         }