fix lint errors

Author: a-tarasyuk

src/compiler/corePublic.ts

@@ -8,7 +8,7 @@ namespace ts {
     export const version: string = `${versionMajorMinor}.0-dev`;
 
     /* @internal */
-    export let typeScriptVersion = versionMajorMinor;
+    export let typeScriptVersion = versionMajorMinor; // eslint-disable-line prefer-const
 
     /**
      * Type of objects whose values are all of the same type.

src/compiler/program.ts

@@ -1074,7 +1074,7 @@ namespace ts {
         const supportedExtensionsWithJsonIfResolveJsonModule = getSupportedExtensionsWithJsonIfResolveJsonModule(options, supportedExtensions);
 
         let _typeScriptVersion: Version | undefined;
-        let _ignoreDeprecations = new Map<DeprecationPhase, Version>();
+        const _ignoreDeprecations = new Map<DeprecationPhase, Version>();
 
         // Map storing if there is emit blocking diagnostics for given input
         const hasEmitBlockingDiagnostics = new Map<string, boolean>();
@@ -3746,11 +3746,11 @@ namespace ts {
         function createDeprecatedDiagnosticForOption(name: string, value?: string) {
             const version = getTypeScriptVersion();
             if (version.compareTo(getIgnoreDeprecationsVersion(DeprecationPhase.Phase3)) === Comparison.EqualTo) {
-                createDiagnosticForOption(/*onKey*/ !value, name, undefined, Diagnostics.Flag_0_is_deprecated_please_remove_it_from_your_configuration, value || name);
+                createDiagnosticForOption(/*onKey*/ !value, name, /*option2*/ undefined, Diagnostics.Flag_0_is_deprecated_please_remove_it_from_your_configuration, value || name);
             }
             else {
                 const nextPhase = version.compareTo(getIgnoreDeprecationsVersion(DeprecationPhase.Phase2)) === Comparison.EqualTo ? DeprecationPhase.Phase3 : DeprecationPhase.Phase2;
-                createDiagnosticForOption(/*onKey*/ !value, name, undefined,
+                createDiagnosticForOption(/*onKey*/ !value, name, /*option2*/ undefined,
                     Diagnostics.Flag_0_is_deprecated_and_will_stop_functioning_in_TypeScript_1_Specify_ignoreDeprecations_Colon_2_to_silence_this_error, value || name, DeprecationPhaseToVersionMap[nextPhase], typeScriptVersion);
             }
         }

src/compiler/types.ts

@@ -6752,7 +6752,7 @@ namespace ts {
         [DeprecationPhase.Phase1]: "5.0",
         [DeprecationPhase.Phase2]: "5.5",
         [DeprecationPhase.Phase3]: "6.0",
-    }
+    };
 
     export interface LineAndCharacter {
         /** 0-based. */