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26 lines
1.3 KiB
Plaintext
26 lines
1.3 KiB
Plaintext
import { CreateType } from '../create/type.mjs';
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import { Union } from '../union/index.mjs';
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import { Never } from '../never/index.mjs';
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import { ExtendsCheck, ExtendsResult } from '../extends/index.mjs';
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import { ExtractFromMappedResult } from './extract-from-mapped-result.mjs';
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import { ExtractFromTemplateLiteral } from './extract-from-template-literal.mjs';
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// ------------------------------------------------------------------
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// TypeGuard
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// ------------------------------------------------------------------
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import { IsMappedResult, IsTemplateLiteral, IsUnion } from '../guard/kind.mjs';
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function ExtractRest(L, R) {
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const extracted = L.filter((inner) => ExtendsCheck(inner, R) !== ExtendsResult.False);
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return extracted.length === 1 ? extracted[0] : Union(extracted);
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}
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/** `[Json]` Constructs a type by extracting from type all union members that are assignable to union */
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export function Extract(L, R, options) {
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// overloads
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if (IsTemplateLiteral(L))
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return CreateType(ExtractFromTemplateLiteral(L, R), options);
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if (IsMappedResult(L))
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return CreateType(ExtractFromMappedResult(L, R), options);
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// prettier-ignore
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return CreateType(IsUnion(L) ? ExtractRest(L.anyOf, R) :
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ExtendsCheck(L, R) !== ExtendsResult.False ? L : Never(), options);
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}
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