fixNoPropertyAccessFromIndexSignature.ts

import {
    codeFixAll,
    createCodeFixAction,
    registerCodeFix,
} from "../_namespaces/ts.codefix.js";
import {
    cast,
    Diagnostics,
    factory,
    getQuotePreference,
    getTokenAtPosition,
    isPropertyAccessChain,
    isPropertyAccessExpression,
    PropertyAccessExpression,
    QuotePreference,
    SourceFile,
    textChanges,
    UserPreferences,
} from "../_namespaces/ts.js";

const fixId = "fixNoPropertyAccessFromIndexSignature";
const errorCodes = [
    Diagnostics.Property_0_comes_from_an_index_signature_so_it_must_be_accessed_with_0.code,
];

registerCodeFix({
    errorCodes,
    fixIds: [fixId],
    getCodeActions(context) {
        const { sourceFile, span, preferences } = context;
        const property = getPropertyAccessExpression(sourceFile, span.start);
        const changes = textChanges.ChangeTracker.with(context, t => doChange(t, context.sourceFile, property, preferences));
        return [createCodeFixAction(fixId, changes, [Diagnostics.Use_element_access_for_0, property.name.text], fixId, Diagnostics.Use_element_access_for_all_undeclared_properties)];
    },
    getAllCodeActions: context => codeFixAll(context, errorCodes, (changes, diag) => doChange(changes, diag.file, getPropertyAccessExpression(diag.file, diag.start), context.preferences)),
});

function doChange(changes: textChanges.ChangeTracker, sourceFile: SourceFile, node: PropertyAccessExpression, preferences: UserPreferences): void {
    const quotePreference = getQuotePreference(sourceFile, preferences);
    const argumentsExpression = factory.createStringLiteral(node.name.text, quotePreference === QuotePreference.Single);
    changes.replaceNode(
        sourceFile,
        node,
        isPropertyAccessChain(node) ?
            factory.createElementAccessChain(node.expression, node.questionDotToken, argumentsExpression) :
            factory.createElementAccessExpression(node.expression, argumentsExpression),
    );
}

function getPropertyAccessExpression(sourceFile: SourceFile, pos: number): PropertyAccessExpression {
    return cast(getTokenAtPosition(sourceFile, pos).parent, isPropertyAccessExpression);
}