Remove deprecated escapeidentifier and unescapeidentifier functions

src/compiler/utilities.ts

@@ -559,14 +559,6 @@ namespace ts {
         return (identifier.length >= 2 && identifier.charCodeAt(0) === CharacterCodes._ && identifier.charCodeAt(1) === CharacterCodes._ ? "_" + identifier : identifier) as __String;
     }
 
-    /**
-     * @deprecated Use `id.escapedText` to get the escaped text of an Identifier.
-     * @param identifier The identifier to escape
-     */
-    export function escapeIdentifier(identifier: string): string {
-        return identifier;
-    }
-
     // Make an identifier from an external module name by extracting the string after the last "/" and replacing
     // all non-alphanumeric characters with underscores
     export function makeIdentifierFromModuleName(moduleName: string): string {
@@ -4787,16 +4779,6 @@ namespace ts {
         return unescapeLeadingUnderscores(symbol.escapedName);
     }
 
-    /**
-     * Remove extra underscore from escaped identifier text content.
-     * @deprecated Use `id.text` for the unescaped text.
-     * @param identifier The escaped identifier text.
-     * @returns The unescaped identifier text.
-     */
-    export function unescapeIdentifier(id: string): string {
-        return id;
-    }
-
     /**
      * A JSDocTypedef tag has an _optional_ name field - if a name is not directly present, we should
      * attempt to draw the name from the node the declaration is on (as that declaration is what its' symbol

tests/baselines/reference/api/tsserverlibrary.d.ts

@@ -6129,11 +6129,6 @@ declare namespace ts {
     function getLiteralText(node: LiteralLikeNode, sourceFile: SourceFile): string;
     function getTextOfConstantValue(value: string | number): string;
     function escapeLeadingUnderscores(identifier: string): __String;
-    /**
-     * @deprecated Use `id.escapedText` to get the escaped text of an Identifier.
-     * @param identifier The identifier to escape
-     */
-    function escapeIdentifier(identifier: string): string;
     function makeIdentifierFromModuleName(moduleName: string): string;
     function isBlockOrCatchScoped(declaration: Declaration): boolean;
     function isCatchClauseVariableDeclarationOrBindingElement(declaration: Declaration): boolean;
@@ -6731,13 +6726,6 @@ declare namespace ts {
     function unescapeLeadingUnderscores(identifier: __String): string;
     function idText(identifier: Identifier): string;
     function symbolName(symbol: Symbol): string;
-    /**
-     * Remove extra underscore from escaped identifier text content.
-     * @deprecated Use `id.text` for the unescaped text.
-     * @param identifier The escaped identifier text.
-     * @returns The unescaped identifier text.
-     */
-    function unescapeIdentifier(id: string): string;
     function getNameOfJSDocTypedef(declaration: JSDocTypedefTag): Identifier | undefined;
     /** @internal */
     function isNamedDeclaration(node: Node): node is NamedDeclaration & {

tests/baselines/reference/api/typescript.d.ts

@@ -3225,13 +3225,6 @@ declare namespace ts {
     function unescapeLeadingUnderscores(identifier: __String): string;
     function idText(identifier: Identifier): string;
     function symbolName(symbol: Symbol): string;
-    /**
-     * Remove extra underscore from escaped identifier text content.
-     * @deprecated Use `id.text` for the unescaped text.
-     * @param identifier The escaped identifier text.
-     * @returns The unescaped identifier text.
-     */
-    function unescapeIdentifier(id: string): string;
     function getNameOfJSDocTypedef(declaration: JSDocTypedefTag): Identifier | undefined;
     function getNameOfDeclaration(declaration: Declaration | Expression): DeclarationName | undefined;
     /**