node_modules/@typescript-eslint/eslint-plugin/dist/rules/return-await.js

"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
const experimental_utils_1 = require("@typescript-eslint/experimental-utils");
const tsutils = __importStar(require("tsutils"));
const ts = __importStar(require("typescript"));
const util = __importStar(require("../util"));
exports.default = util.createRule({
    name: 'return-await',
    meta: {
        docs: {
            description: 'Enforces consistent returning of awaited values',
            category: 'Best Practices',
            recommended: false,
            requiresTypeChecking: true,
            extendsBaseRule: 'no-return-await',
        },
        fixable: 'code',
        type: 'problem',
        messages: {
            nonPromiseAwait: 'Returning an awaited value that is not a promise is not allowed.',
            disallowedPromiseAwait: 'Returning an awaited promise is not allowed in this context.',
            requiredPromiseAwait: 'Returning an awaited promise is required in this context.',
        },
        schema: [
            {
                enum: ['in-try-catch', 'always', 'never'],
            },
        ],
    },
    defaultOptions: ['in-try-catch'],
    create(context, [option]) {
        const parserServices = util.getParserServices(context);
        const checker = parserServices.program.getTypeChecker();
        const sourceCode = context.getSourceCode();
        let scopeInfo = null;
        function enterFunction(node) {
            scopeInfo = {
                hasAsync: node.async,
            };
        }
        function inTry(node) {
            let ancestor = node.parent;
            while (ancestor && !ts.isFunctionLike(ancestor)) {
                if (tsutils.isTryStatement(ancestor)) {
                    return true;
                }
                ancestor = ancestor.parent;
            }
            return false;
        }
        function inCatch(node) {
            let ancestor = node.parent;
            while (ancestor && !ts.isFunctionLike(ancestor)) {
                if (tsutils.isCatchClause(ancestor)) {
                    return true;
                }
                ancestor = ancestor.parent;
            }
            return false;
        }
        function isReturnPromiseInFinally(node) {
            let ancestor = node.parent;
            while (ancestor && !ts.isFunctionLike(ancestor)) {
                if (tsutils.isTryStatement(ancestor.parent) &&
                    tsutils.isBlock(ancestor) &&
                    ancestor.parent.end === ancestor.end) {
                    return true;
                }
                ancestor = ancestor.parent;
            }
            return false;
        }
        function hasFinallyBlock(node) {
            let ancestor = node.parent;
            while (ancestor && !ts.isFunctionLike(ancestor)) {
                if (tsutils.isTryStatement(ancestor)) {
                    return !!ancestor.finallyBlock;
                }
                ancestor = ancestor.parent;
            }
            return false;
        }
        // function findTokensToRemove()
        function removeAwait(fixer, node) {
            // Should always be an await node; but let's be safe.
            /* istanbul ignore if */ if (!util.isAwaitExpression(node)) {
                return null;
            }
            const awaitToken = sourceCode.getFirstToken(node, util.isAwaitKeyword);
            // Should always be the case; but let's be safe.
            /* istanbul ignore if */ if (!awaitToken) {
                return null;
            }
            const startAt = awaitToken.range[0];
            let endAt = awaitToken.range[1];
            // Also remove any extraneous whitespace after `await`, if there is any.
            const nextToken = sourceCode.getTokenAfter(awaitToken, {
                includeComments: true,
            });
            if (nextToken) {
                endAt = nextToken.range[0];
            }
            return fixer.removeRange([startAt, endAt]);
        }
        function insertAwait(fixer, node) {
            return fixer.insertTextBefore(node, 'await ');
        }
        function test(node, expression) {
            let child;
            const isAwait = tsutils.isAwaitExpression(expression);
            if (isAwait) {
                child = expression.getChildAt(1);
            }
            else {
                child = expression;
            }
            const type = checker.getTypeAtLocation(child);
            const isThenable = tsutils.isThenableType(checker, expression, type);
            if (!isAwait && !isThenable) {
                return;
            }
            if (isAwait && !isThenable) {
                context.report({
                    messageId: 'nonPromiseAwait',
                    node,
                    fix: fixer => removeAwait(fixer, node),
                });
                return;
            }
            if (option === 'always') {
                if (!isAwait && isThenable) {
                    context.report({
                        messageId: 'requiredPromiseAwait',
                        node,
                        fix: fixer => insertAwait(fixer, node),
                    });
                }
                return;
            }
            if (option === 'never') {
                if (isAwait) {
                    context.report({
                        messageId: 'disallowedPromiseAwait',
                        node,
                        fix: fixer => removeAwait(fixer, node),
                    });
                }
                return;
            }
            if (option === 'in-try-catch') {
                const isInTryCatch = inTry(expression) || inCatch(expression);
                if (isAwait && !isInTryCatch) {
                    context.report({
                        messageId: 'disallowedPromiseAwait',
                        node,
                        fix: fixer => removeAwait(fixer, node),
                    });
                }
                else if (!isAwait && isInTryCatch) {
                    if (inCatch(expression) && !hasFinallyBlock(expression)) {
                        return;
                    }
                    if (isReturnPromiseInFinally(expression)) {
                        return;
                    }
                    context.report({
                        messageId: 'requiredPromiseAwait',
                        node,
                        fix: fixer => insertAwait(fixer, node),
                    });
                }
                return;
            }
        }
        function findPossiblyReturnedNodes(node) {
            if (node.type === experimental_utils_1.AST_NODE_TYPES.ConditionalExpression) {
                return [
                    ...findPossiblyReturnedNodes(node.alternate),
                    ...findPossiblyReturnedNodes(node.consequent),
                ];
            }
            return [node];
        }
        return {
            FunctionDeclaration: enterFunction,
            FunctionExpression: enterFunction,
            ArrowFunctionExpression: enterFunction,
            'ArrowFunctionExpression[async = true]:exit'(node) {
                if (node.body.type !== experimental_utils_1.AST_NODE_TYPES.BlockStatement) {
                    findPossiblyReturnedNodes(node.body).forEach(node => {
                        const tsNode = parserServices.esTreeNodeToTSNodeMap.get(node);
                        test(node, tsNode);
                    });
                }
            },
            ReturnStatement(node) {
                if (!scopeInfo || !scopeInfo.hasAsync || !node.argument) {
                    return;
                }
                findPossiblyReturnedNodes(node.argument).forEach(node => {
                    const tsNode = parserServices.esTreeNodeToTSNodeMap.get(node);
                    test(node, tsNode);
                });
            },
        };
    },
});
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