return-await.js
9.08 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
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) {
// any/unknown could be thenable; do not auto-fix
const useAutoFix = !(util.isTypeAnyType(type) || util.isTypeUnknownType(type));
const fix = (fixer) => removeAwait(fixer, node);
context.report(Object.assign({ messageId: 'nonPromiseAwait', node }, (useAutoFix
? { fix }
: {
suggest: [
{
messageId: 'nonPromiseAwait',
fix,
},
],
})));
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);
});
},
};
},
});
//# sourceMappingURL=return-await.js.map