Function convertToAsyncFunction

test/fixtures/snapshot/typescript.js:151380–151438

(changes, sourceFile, position, checker)

            SynthBindingNameKind[SynthBindingNameKind["BindingPattern"] = 1] = "BindingPattern";
        })(SynthBindingNameKind || (SynthBindingNameKind = {}));
        function convertToAsyncFunction(changes, sourceFile, position, checker) {
            // get the function declaration - returns a promise
            var tokenAtPosition = ts.getTokenAtPosition(sourceFile, position);
            var functionToConvert;
            // if the parent of a FunctionLikeDeclaration is a variable declaration, the convertToAsync diagnostic will be reported on the variable name
            if (ts.isIdentifier(tokenAtPosition) && ts.isVariableDeclaration(tokenAtPosition.parent) &&
                tokenAtPosition.parent.initializer && ts.isFunctionLikeDeclaration(tokenAtPosition.parent.initializer)) {
                functionToConvert = tokenAtPosition.parent.initializer;
            }
            else {
                functionToConvert = ts.tryCast(ts.getContainingFunction(ts.getTokenAtPosition(sourceFile, position)), ts.canBeConvertedToAsync);
            }
            if (!functionToConvert) {
                return;
            }
            var synthNamesMap = new ts.Map();
            var isInJavascript = ts.isInJSFile(functionToConvert);
            var setOfExpressionsToReturn = getAllPromiseExpressionsToReturn(functionToConvert, checker);
            var functionToConvertRenamed = renameCollidingVarNames(functionToConvert, checker, synthNamesMap);
            if (!ts.returnsPromise(functionToConvertRenamed, checker)) {
                return;
            }
            var returnStatements = functionToConvertRenamed.body && ts.isBlock(functionToConvertRenamed.body) ? getReturnStatementsWithPromiseHandlers(functionToConvertRenamed.body, checker) : ts.emptyArray;
            var transformer = { checker: checker, synthNamesMap: synthNamesMap, setOfExpressionsToReturn: setOfExpressionsToReturn, isInJSFile: isInJavascript };
            if (!returnStatements.length) {
                return;
            }
            var pos = functionToConvert.modifiers ? functionToConvert.modifiers.end :
                functionToConvert.decorators ? ts.skipTrivia(sourceFile.text, functionToConvert.decorators.end) :
                    functionToConvert.getStart(sourceFile);
            var options = functionToConvert.modifiers ? { prefix: " " } : { suffix: " " };
            changes.insertModifierAt(sourceFile, pos, 131 /* SyntaxKind.AsyncKeyword */, options);
            var _loop_14 = function (returnStatement) {
                ts.forEachChild(returnStatement, function visit(node) {
                    if (ts.isCallExpression(node)) {
                        var newNodes = transformExpression(node, node, transformer, /*hasContinuation*/ false);
                        if (hasFailed()) {
                            return true; // return something truthy to shortcut out of more work
                        }
                        changes.replaceNodeWithNodes(sourceFile, returnStatement, newNodes);
                    }
                    else if (!ts.isFunctionLike(node)) {
                        ts.forEachChild(node, visit);
                        if (hasFailed()) {
                            return true; // return something truthy to shortcut out of more work
                        }
                    }
                });
                if (hasFailed()) {
                    return { value: void 0 };
                }
            };
            for (var _i = 0, returnStatements_1 = returnStatements; _i < returnStatements_1.length; _i++) {
                var returnStatement = returnStatements_1[_i];
                var state_5 = _loop_14(returnStatement);
                if (typeof state_5 === "object")
                    return state_5.value;
            }