/* @internal */

namespace ts.codefix {

const fixId = "fixConvertConstToLet";

const errorCodes = [Diagnostics.Cannot_assign_to_0_because_it_is_a_constant.code];

registerCodeFix({

errorCodes,

getCodeActions: context => {

const { sourceFile, span, program } = context;

const range = getConstTokenRange(sourceFile, span.start, program);

if (range === undefined) return;

const changes = textChanges.ChangeTracker.with(context, t => doChange(t, sourceFile, range));

return [createCodeFixAction(fixId, changes, Diagnostics.Convert_const_to_let, fixId, Diagnostics.Convert_const_to_let)];

},

fixIds: [fixId]

});

function getConstTokenRange(sourceFile: SourceFile, pos: number, program: Program) {

const checker = program.getTypeChecker();

const symbol = checker.getSymbolAtLocation(getTokenAtPosition(sourceFile, pos));

const declaration = tryCast(symbol?.valueDeclaration?.parent, isVariableDeclarationList);

if (declaration === undefined) return;

const constToken = findChildOfKind(declaration, SyntaxKind.ConstKeyword, sourceFile);

if (constToken === undefined) return;

return createRange(constToken.pos, constToken.end);

}

function doChange(changes: textChanges.ChangeTracker, sourceFile: SourceFile, range: TextRange) {

changes.replaceRangeWithText(sourceFile, range, "let");

}

}