Function getUsageInfo

test/fixtures/snapshot/typescript.js:162407–162468

(oldFile, toMove, checker)

            return movedSymbols.forEachEntry(ts.symbolNameNoDefault) || "newFile";
        }
        function getUsageInfo(oldFile, toMove, checker) {
            var movedSymbols = new SymbolSet();
            var oldImportsNeededByNewFile = new SymbolSet();
            var newFileImportsFromOldFile = new SymbolSet();
            var containsJsx = ts.find(toMove, function (statement) { return !!(statement.transformFlags & 2 /* TransformFlags.ContainsJsx */); });
            var jsxNamespaceSymbol = getJsxNamespaceSymbol(containsJsx);
            if (jsxNamespaceSymbol) { // Might not exist (e.g. in non-compiling code)
                oldImportsNeededByNewFile.add(jsxNamespaceSymbol);
            }
            for (var _i = 0, toMove_1 = toMove; _i < toMove_1.length; _i++) {
                var statement = toMove_1[_i];
                forEachTopLevelDeclaration(statement, function (decl) {
                    movedSymbols.add(ts.Debug.checkDefined(ts.isExpressionStatement(decl) ? checker.getSymbolAtLocation(decl.expression.left) : decl.symbol, "Need a symbol here"));
                });
            }
            for (var _a = 0, toMove_2 = toMove; _a < toMove_2.length; _a++) {
                var statement = toMove_2[_a];
                forEachReference(statement, checker, function (symbol) {
                    if (!symbol.declarations)
                        return;
                    for (var _i = 0, _a = symbol.declarations; _i < _a.length; _i++) {
                        var decl = _a[_i];
                        if (isInImport(decl)) {
                            oldImportsNeededByNewFile.add(symbol);
                        }
                        else if (isTopLevelDeclaration(decl) && sourceFileOfTopLevelDeclaration(decl) === oldFile && !movedSymbols.has(symbol)) {
                            newFileImportsFromOldFile.add(symbol);
                        }
                    }
                });
            }
            var unusedImportsFromOldFile = oldImportsNeededByNewFile.clone();
            var oldFileImportsFromNewFile = new SymbolSet();
            for (var _b = 0, _c = oldFile.statements; _b < _c.length; _b++) {
                var statement = _c[_b];
                if (ts.contains(toMove, statement))
                    continue;
                // jsxNamespaceSymbol will only be set iff it is in oldImportsNeededByNewFile.
                if (jsxNamespaceSymbol && !!(statement.transformFlags & 2 /* TransformFlags.ContainsJsx */)) {
                    unusedImportsFromOldFile.delete(jsxNamespaceSymbol);
                }
                forEachReference(statement, checker, function (symbol) {
                    if (movedSymbols.has(symbol))
                        oldFileImportsFromNewFile.add(symbol);
                    unusedImportsFromOldFile.delete(symbol);
                });
            }
            return { movedSymbols: movedSymbols, newFileImportsFromOldFile: newFileImportsFromOldFile, oldFileImportsFromNewFile: oldFileImportsFromNewFile, oldImportsNeededByNewFile: oldImportsNeededByNewFile, unusedImportsFromOldFile: unusedImportsFromOldFile };
            function getJsxNamespaceSymbol(containsJsx) {
                if (containsJsx === undefined) {
                    return undefined;
                }
                var jsxNamespace = checker.getJsxNamespace(containsJsx);
                // Strictly speaking, this could resolve to a symbol other than the JSX namespace.
                // This will produce erroneous output (probably, an incorrectly copied import) but
                // is expected to be very rare and easily reversible.
                var jsxNamespaceSymbol = checker.resolveName(jsxNamespace, containsJsx, 1920 /* SymbolFlags.Namespace */, /*excludeGlobals*/ true);
                return !!jsxNamespaceSymbol && ts.some(jsxNamespaceSymbol.declarations, isInImport)