Export libMap so API users can get lib.d.ts listing

Author: jakebailey

src/compiler/commandLineParser.ts

@@ -235,10 +235,8 @@ export const libs = libEntries.map(entry => entry[0]);
 /**
  * A map of lib names to lib files. This map is used both for parsing the "lib" command line
  * option as well as for resolving lib reference directives.
- *
- * @internal
  */
-export const libMap = new Map(libEntries);
+export const libMap: ReadonlyMap<string, string> = new Map(libEntries);
 
 // Watch related options
 /** @internal */
@@ -2524,7 +2522,7 @@ function matchesSpecs(path: string, includeSpecs: readonly string[] | undefined,
     return returnTrue;
 }
 
-function getCustomTypeMapOfCommandLineOption(optionDefinition: CommandLineOption): Map<string, string | number> | undefined {
+function getCustomTypeMapOfCommandLineOption(optionDefinition: CommandLineOption): ReadonlyMap<string, string | number> | undefined {
     switch (optionDefinition.type) {
         case "string":
         case "number":
@@ -2541,7 +2539,7 @@ function getCustomTypeMapOfCommandLineOption(optionDefinition: CommandLineOption
 }
 
 /** @internal */
-export function getNameOfCompilerOptionValue(value: CompilerOptionsValue, customTypeMap: Map<string, string | number>): string | undefined {
+export function getNameOfCompilerOptionValue(value: CompilerOptionsValue, customTypeMap: ReadonlyMap<string, string | number>): string | undefined {
     // There is a typeMap associated with this command-line option so use it to map value back to its name
     return forEachEntry(customTypeMap, (mapValue, key) => {
         if (mapValue === value) {

src/compiler/types.ts

@@ -7370,7 +7370,7 @@ export interface CreateProgramOptions {
 /** @internal */
 export interface CommandLineOptionBase {
     name: string;
-    type: "string" | "number" | "boolean" | "object" | "list" | "listOrElement" | Map<string, number | string>;    // a value of a primitive type, or an object literal mapping named values to actual values
+    type: "string" | "number" | "boolean" | "object" | "list" | "listOrElement" | ReadonlyMap<string, number | string>;    // a value of a primitive type, or an object literal mapping named values to actual values
     isFilePath?: boolean;                                   // True if option value is a path or fileName
     shortName?: string;                                     // A short mnemonic for convenience - for instance, 'h' can be used in place of 'help'
     description?: DiagnosticMessage;                        // The message describing what the command line switch does.
@@ -7414,7 +7414,7 @@ export interface CommandLineOptionOfBooleanType extends CommandLineOptionBase {
 
 /** @internal */
 export interface CommandLineOptionOfCustomType extends CommandLineOptionBase {
-    type: Map<string, number | string>;  // an object literal mapping named values to actual values
+    type: ReadonlyMap<string, number | string>;  // an object literal mapping named values to actual values
     defaultValueDescription: number | string | undefined | DiagnosticMessage;
     deprecatedKeys?: Set<string>;
 }

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

@@ -9239,6 +9239,11 @@ declare namespace ts {
         options: TypeAcquisition;
         errors: Diagnostic[];
     };
+    /**
+     * A map of lib names to lib files. This map is used both for parsing the "lib" command line
+     * option as well as for resolving lib reference directives.
+     */
+    const libMap: ReadonlyMap<string, string>;
     type DiagnosticReporter = (diagnostic: Diagnostic) => void;
     /**
      * Reports config file diagnostics

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

@@ -5193,6 +5193,11 @@ declare namespace ts {
         options: TypeAcquisition;
         errors: Diagnostic[];
     };
+    /**
+     * A map of lib names to lib files. This map is used both for parsing the "lib" command line
+     * option as well as for resolving lib reference directives.
+     */
+    const libMap: ReadonlyMap<string, string>;
     type DiagnosticReporter = (diagnostic: Diagnostic) => void;
     /**
      * Reports config file diagnostics