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
|
"use strict";
/**
* @license
* Copyright 2013 Palantir Technologies, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
var tsutils_1 = require("tsutils");
var ts = require("typescript");
var Lint = require("../index");
var Rule = (function (_super) {
tslib_1.__extends(Rule, _super);
function Rule() {
return _super !== null && _super.apply(this, arguments) || this;
}
/* tslint:enable:object-literal-sort-keys */
Rule.FAILURE_STRING_FACTORY = function (type, sigSuggestion) {
return type + " has only a call signature \u2014 use `" + sigSuggestion + "` instead.";
};
Rule.prototype.apply = function (sourceFile) {
return this.applyWithFunction(sourceFile, walk);
};
return Rule;
}(Lint.Rules.AbstractRule));
/* tslint:disable:object-literal-sort-keys */
Rule.metadata = {
ruleName: "callable-types",
description: "An interface or literal type with just a call signature can be written as a function type.",
rationale: "style",
optionsDescription: "Not configurable.",
options: null,
type: "style",
typescriptOnly: true,
hasFix: true,
};
exports.Rule = Rule;
function walk(ctx) {
return ts.forEachChild(ctx.sourceFile, function cb(node) {
if ((tsutils_1.isInterfaceDeclaration(node) && noSupertype(node)
|| tsutils_1.isTypeLiteralNode(node))
&& node.members.length === 1) {
var member = node.members[0];
if (tsutils_1.isCallSignatureDeclaration(member) &&
// avoid bad parse
member.type !== undefined) {
var suggestion = renderSuggestion(member, node, ctx.sourceFile);
ctx.addFailureAtNode(member, Rule.FAILURE_STRING_FACTORY(node.kind === ts.SyntaxKind.TypeLiteral ? "Type literal" : "Interface", suggestion), Lint.Replacement.replaceNode(node, suggestion));
}
}
return ts.forEachChild(node, cb);
});
}
/** True if there is no supertype or if the supertype is `Function`. */
function noSupertype(node) {
if (node.heritageClauses === undefined) {
return true;
}
if (node.heritageClauses.length !== 1) {
return false;
}
var expr = node.heritageClauses[0].types[0].expression;
return tsutils_1.isIdentifier(expr) && expr.text === "Function";
}
function renderSuggestion(call, parent, sourceFile) {
var start = call.getStart(sourceFile);
var colonPos = call.type.pos - 1 - start;
var text = sourceFile.text.substring(start, call.end);
var suggestion = text.substr(0, colonPos) + " =>" + text.substr(colonPos + 1);
if (parent.kind === ts.SyntaxKind.InterfaceDeclaration) {
if (parent.typeParameters !== undefined) {
return "type" + sourceFile.text.substring(parent.name.pos, parent.typeParameters.end + 1) + " = " + suggestion;
}
else {
return "type " + parent.name.text + " = " + suggestion;
}
}
return suggestion.endsWith(";") ? suggestion.slice(0, -1) : suggestion;
}
|
