Function checkExternalEmitHelpers

test/fixtures/snapshot/typescript.js:87606–87641

(location, helpers)

            amalgamatedDuplicates = undefined;
        }
        function checkExternalEmitHelpers(location, helpers) {
            if ((requestedExternalEmitHelpers & helpers) !== helpers && compilerOptions.importHelpers) {
                var sourceFile = ts.getSourceFileOfNode(location);
                if (ts.isEffectiveExternalModule(sourceFile, compilerOptions) && !(location.flags & 16777216 /* NodeFlags.Ambient */)) {
                    var helpersModule = resolveHelpersModule(sourceFile, location);
                    if (helpersModule !== unknownSymbol) {
                        var uncheckedHelpers = helpers & ~requestedExternalEmitHelpers;
                        for (var helper = 1 /* ExternalEmitHelpers.FirstEmitHelper */; helper <= 4194304 /* ExternalEmitHelpers.LastEmitHelper */; helper <<= 1) {
                            if (uncheckedHelpers & helper) {
                                var name = getHelperName(helper);
                                var symbol = getSymbol(helpersModule.exports, ts.escapeLeadingUnderscores(name), 111551 /* SymbolFlags.Value */);
                                if (!symbol) {
                                    error(location, ts.Diagnostics.This_syntax_requires_an_imported_helper_named_1_which_does_not_exist_in_0_Consider_upgrading_your_version_of_0, ts.externalHelpersModuleNameText, name);
                                }
                                else if (helper & 524288 /* ExternalEmitHelpers.ClassPrivateFieldGet */) {
                                    if (!ts.some(getSignaturesOfSymbol(symbol), function (signature) { return getParameterCount(signature) > 3; })) {
                                        error(location, ts.Diagnostics.This_syntax_requires_an_imported_helper_named_1_with_2_parameters_which_is_not_compatible_with_the_one_in_0_Consider_upgrading_your_version_of_0, ts.externalHelpersModuleNameText, name, 4);
                                    }
                                }
                                else if (helper & 1048576 /* ExternalEmitHelpers.ClassPrivateFieldSet */) {
                                    if (!ts.some(getSignaturesOfSymbol(symbol), function (signature) { return getParameterCount(signature) > 4; })) {
                                        error(location, ts.Diagnostics.This_syntax_requires_an_imported_helper_named_1_with_2_parameters_which_is_not_compatible_with_the_one_in_0_Consider_upgrading_your_version_of_0, ts.externalHelpersModuleNameText, name, 5);
                                    }
                                }
                                else if (helper & 1024 /* ExternalEmitHelpers.SpreadArray */) {
                                    if (!ts.some(getSignaturesOfSymbol(symbol), function (signature) { return getParameterCount(signature) > 2; })) {
                                        error(location, ts.Diagnostics.This_syntax_requires_an_imported_helper_named_1_with_2_parameters_which_is_not_compatible_with_the_one_in_0_Consider_upgrading_your_version_of_0, ts.externalHelpersModuleNameText, name, 3);
                                    }
                                }
                            }
                        }
                    }
                    requestedExternalEmitHelpers |= helpers;
                }
            }
        }
        function getHelperName(helper) {
            switch (helper) {
                case 1 /* ExternalEmitHelpers.Extends */: return "__extends";