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Unused Identifier codefix better understands constructors and methods (#41555)

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* Unuse Identifier codefix understands constructors

Previously, it did not look for `super()` and `new this()` calls when
determining whether a constructor parameter could be deleted.

* better names, fix off-by-1 bug

* Codefix understands super methods now too

This unifies the code, changing it considerably.
This commit is contained in:
Nathan Shively-Sanders
2020-11-18 11:19:43 -08:00
committed by GitHub
parent 6643d97385
commit d3abd35428
6 changed files with 147 additions and 50 deletions
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55
src/services/codefixes/fixUnusedIdentifier.ts
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@@ -18,7 +18,7 @@ namespace ts.codefix {
registerCodeFix({
errorCodes,
getCodeActions(context) {
const { errorCode, sourceFile, program } = context;
const { errorCode, sourceFile, program, cancellationToken } = context;
const checker = program.getTypeChecker();
const sourceFiles = program.getSourceFiles();
const token = getTokenAtPosition(sourceFile, context.span.start);
@@ -36,7 +36,7 @@ namespace ts.codefix {
return [createCodeFixAction(fixName, changes, [Diagnostics.Remove_import_from_0, showModuleSpecifier(importDecl)], fixIdDeleteImports, Diagnostics.Delete_all_unused_imports)];
}
else if (isImport(token)) {
const deletion = textChanges.ChangeTracker.with(context, t => tryDeleteDeclaration(sourceFile, token, t, checker, sourceFiles, /*isFixAll*/ false));
const deletion = textChanges.ChangeTracker.with(context, t => tryDeleteDeclaration(sourceFile, token, t, checker, sourceFiles, program, cancellationToken, /*isFixAll*/ false));
if (deletion.length) {
return [createCodeFixAction(fixName, deletion, [Diagnostics.Remove_unused_declaration_for_Colon_0, token.getText(sourceFile)], fixIdDeleteImports, Diagnostics.Delete_all_unused_imports)];
}
@@ -75,7 +75,7 @@ namespace ts.codefix {
}
else {
const deletion = textChanges.ChangeTracker.with(context, t =>
tryDeleteDeclaration(sourceFile, token, t, checker, sourceFiles, /*isFixAll*/ false));
tryDeleteDeclaration(sourceFile, token, t, checker, sourceFiles, program, cancellationToken, /*isFixAll*/ false));
if (deletion.length) {
const name = isComputedPropertyName(token.parent) ? token.parent : token;
result.push(createDeleteFix(deletion, [Diagnostics.Remove_unused_declaration_for_Colon_0, name.getText(sourceFile)]));
@@ -91,7 +91,7 @@ namespace ts.codefix {
},
fixIds: [fixIdPrefix, fixIdDelete, fixIdDeleteImports, fixIdInfer],
getAllCodeActions: context => {
const { sourceFile, program } = context;
const { sourceFile, program, cancellationToken } = context;
const checker = program.getTypeChecker();
const sourceFiles = program.getSourceFiles();
return codeFixAll(context, errorCodes, (changes, diag) => {
@@ -106,7 +106,7 @@ namespace ts.codefix {
changes.delete(sourceFile, importDecl);
}
else if (isImport(token)) {
tryDeleteDeclaration(sourceFile, token, changes, checker, sourceFiles, /*isFixAll*/ true);
tryDeleteDeclaration(sourceFile, token, changes, checker, sourceFiles, program, cancellationToken, /*isFixAll*/ true);
}
break;
}
@@ -132,7 +132,7 @@ namespace ts.codefix {
deleteEntireVariableStatement(changes, sourceFile, <VariableDeclarationList>token.parent);
}
else {
tryDeleteDeclaration(sourceFile, token, changes, checker, sourceFiles, /*isFixAll*/ true);
tryDeleteDeclaration(sourceFile, token, changes, checker, sourceFiles, program, cancellationToken, /*isFixAll*/ true);
}
break;
}
@@ -217,8 +217,8 @@ namespace ts.codefix {
return false;
}
function tryDeleteDeclaration(sourceFile: SourceFile, token: Node, changes: textChanges.ChangeTracker, checker: TypeChecker, sourceFiles: readonly SourceFile[], isFixAll: boolean) {
tryDeleteDeclarationWorker(token, changes, sourceFile, checker, sourceFiles, isFixAll);
function tryDeleteDeclaration(sourceFile: SourceFile, token: Node, changes: textChanges.ChangeTracker, checker: TypeChecker, sourceFiles: readonly SourceFile[], program: Program, cancellationToken: CancellationToken, isFixAll: boolean) {
tryDeleteDeclarationWorker(token, changes, sourceFile, checker, sourceFiles, program, cancellationToken, isFixAll);
if (isIdentifier(token)) deleteAssignments(changes, sourceFile, token, checker);
}
@@ -231,18 +231,18 @@ namespace ts.codefix {
});
}
function tryDeleteDeclarationWorker(token: Node, changes: textChanges.ChangeTracker, sourceFile: SourceFile, checker: TypeChecker, sourceFiles: readonly SourceFile[], isFixAll: boolean): void {
function tryDeleteDeclarationWorker(token: Node, changes: textChanges.ChangeTracker, sourceFile: SourceFile, checker: TypeChecker, sourceFiles: readonly SourceFile[], program: Program, cancellationToken: CancellationToken, isFixAll: boolean): void {
const { parent } = token;
if (isParameter(parent)) {
tryDeleteParameter(changes, sourceFile, parent, checker, sourceFiles, isFixAll);
tryDeleteParameter(changes, sourceFile, parent, checker, sourceFiles, program, cancellationToken, isFixAll);
}
else {
changes.delete(sourceFile, isImportClause(parent) ? token : isComputedPropertyName(parent) ? parent.parent : parent);
}
}
function tryDeleteParameter(changes: textChanges.ChangeTracker, sourceFile: SourceFile, p: ParameterDeclaration, checker: TypeChecker, sourceFiles: readonly SourceFile[], isFixAll = false): void {
if (mayDeleteParameter(checker, sourceFile, p, isFixAll)) {
function tryDeleteParameter(changes: textChanges.ChangeTracker, sourceFile: SourceFile, p: ParameterDeclaration, checker: TypeChecker, sourceFiles: readonly SourceFile[], program: Program, cancellationToken: CancellationToken, isFixAll = false): void {
if (mayDeleteParameter(checker, sourceFile, p, sourceFiles, program, cancellationToken, isFixAll)) {
if (p.modifiers && p.modifiers.length > 0 &&
(!isIdentifier(p.name) || FindAllReferences.Core.isSymbolReferencedInFile(p.name, checker, sourceFile))) {
p.modifiers.forEach(modifier => changes.deleteModifier(sourceFile, modifier));
@@ -254,15 +254,36 @@ namespace ts.codefix {
}
}
function mayDeleteParameter(checker: TypeChecker, sourceFile: SourceFile, parameter: ParameterDeclaration, isFixAll: boolean): boolean {
function mayDeleteParameter(checker: TypeChecker, sourceFile: SourceFile, parameter: ParameterDeclaration, sourceFiles: readonly SourceFile[], program: Program, cancellationToken: CancellationToken, isFixAll: boolean): boolean {
const { parent } = parameter;
switch (parent.kind) {
case SyntaxKind.MethodDeclaration:
// Don't remove a parameter if this overrides something.
const symbol = checker.getSymbolAtLocation(parent.name)!;
if (isMemberSymbolInBaseType(symbol, checker)) return false;
// falls through
case SyntaxKind.Constructor:
const index = parent.parameters.indexOf(parameter);
const referent = isMethodDeclaration(parent) ? parent.name : parent;
const entries = FindAllReferences.Core.getReferencedSymbolsForNode(parent.pos, referent, program, sourceFiles, cancellationToken);
if (entries) {
for (const entry of entries) {
for (const reference of entry.references) {
if (reference.kind === FindAllReferences.EntryKind.Node) {
// argument in super(...)
const isSuperCall = isSuperKeyword(reference.node)
&& isCallExpression(reference.node.parent)
&& reference.node.parent.arguments.length > index;
// argument in super.m(...)
const isSuperMethodCall = isPropertyAccessExpression(reference.node.parent)
&& isSuperKeyword(reference.node.parent.expression)
&& isCallExpression(reference.node.parent.parent)
&& reference.node.parent.parent.arguments.length > index;
// parameter in overridden or overriding method
const isOverriddenMethod = (isMethodDeclaration(reference.node.parent) || isMethodSignature(reference.node.parent))
&& reference.node.parent !== parameter.parent
&& reference.node.parent.parameters.length > index;
if (isSuperCall || isSuperMethodCall || isOverriddenMethod) return false;
}
}
}
}
return true;
case SyntaxKind.FunctionDeclaration: {
if (parent.name && isCallbackLike(checker, sourceFile, parent.name)) {