TDZ violation of canProdiceDiagnostic (sic)

[tangjfn]

TypeScript Version: 3.4.0-dev.201xxxxx

Search Terms:

Code

file: src/compiler/transformers/declarations.ts

function visitDeclarationSubtree(input: Node): VisitResult<Node> {
            if (shouldStripInternal(input)) return;
            if (isDeclaration(input)) {
                if (isDeclarationAndNotVisible(input)) return;
                if (hasDynamicName(input) && !resolver.isLateBound(getParseTreeNode(input) as Declaration)) {
                    return;
                }
            }

            // Elide implementation signatures from overload sets
            if (isFunctionLike(input) && resolver.isImplementationOfOverload(input)) return;

            // Elide semicolon class statements
            if (isSemicolonClassElement(input)) return;

            let previousEnclosingDeclaration: typeof enclosingDeclaration;
            if (isEnclosingDeclaration(input)) {
                previousEnclosingDeclaration = enclosingDeclaration;
                enclosingDeclaration = input as Declaration;
            }
            const oldDiag = getSymbolAccessibilityDiagnostic;

            // Emit methods which are private as properties with no type information
            if (isMethodDeclaration(input) || isMethodSignature(input)) {
                if (hasModifier(input, ModifierFlags.Private)) {
                    if (input.symbol && input.symbol.declarations && input.symbol.declarations[0] !== input) return; // Elide all but the first overload
                    // !!!! here, cleanup will use canProdiceDiagnostic, but canProdiceDiagnostic not defined
                    return cleanup(createProperty(/*decorators*/undefined, ensureModifiers(input), input.name, /*questionToken*/ undefined, /*type*/ undefined, /*initializer*/ undefined));
                }
            }

            const canProdiceDiagnostic = canProduceDiagnostics(input);
            if (canProdiceDiagnostic && !suppressNewDiagnosticContexts) {
                getSymbolAccessibilityDiagnostic = createGetSymbolAccessibilityDiagnosticForNode(input as DeclarationDiagnosticProducing);
            }

Gulp, Webpack, etc.

Expected behavior:

Actual behavior:

Playground Link:

Related Issues:

[jakebailey]

This was fixed back in #32221.