/
removeTypeDuplicates.ts
66 lines (53 loc) 路 1.26 KB
/
removeTypeDuplicates.ts
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
import {
isTSAnyKeyword,
isTSUnionType,
isTSBaseType,
} from "../../validators/generated";
import type * as t from "../..";
/**
* Dedupe type annotations.
*/
export default function removeTypeDuplicates(
nodes: Array<t.TSType>,
): Array<t.TSType> {
const generics = {};
const bases = {};
// store union type groups to circular references
const typeGroups = [];
const types = [];
for (let i = 0; i < nodes.length; i++) {
const node = nodes[i];
if (!node) continue;
// detect duplicates
if (types.indexOf(node) >= 0) {
continue;
}
// this type matches anything
if (isTSAnyKeyword(node)) {
return [node];
}
// Analogue of FlowBaseAnnotation
if (isTSBaseType(node)) {
bases[node.type] = node;
continue;
}
if (isTSUnionType(node)) {
if (typeGroups.indexOf(node.types) < 0) {
Array.prototype.push.apply(nodes, node.types);
typeGroups.push(node.types);
}
continue;
}
// TODO: add generic types
types.push(node);
}
// add back in bases
for (const type of Object.keys(bases)) {
types.push(bases[type]);
}
// add back in generics
for (const name of Object.keys(generics)) {
types.push(generics[name]);
}
return types;
}