@typescript-eslint/eslint-plugin
Version:
TypeScript plugin for ESLint
71 lines (70 loc) • 2.7 kB
JavaScript
;
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o[k2] = m[k];
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var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
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var __importStar = (this && this.__importStar) || (function () {
var ownKeys = function(o) {
ownKeys = Object.getOwnPropertyNames || function (o) {
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Object.defineProperty(exports, "__esModule", { value: true });
exports.getConstraintInfo = getConstraintInfo;
const tsutils = __importStar(require("ts-api-utils"));
/**
* Returns whether the type is a generic and what its constraint is.
*
* If the type is not a generic, `isTypeParameter` will be `false`, and
* `constraintType` will be the same as the input type.
*
* If the type is a generic, and it is constrained, `isTypeParameter` will be
* `true`, and `constraintType` will be the constraint type.
*
* If the type is a generic, but it is not constrained, `constraintType` will be
* `undefined` (rather than an `unknown` type), due to https://github.com/microsoft/TypeScript/issues/60475
*
* Successor to {@link getConstrainedTypeAtLocation} due to https://github.com/typescript-eslint/typescript-eslint/issues/10438
*
* This is considered internal since it is unstable for now and may have breaking changes at any time.
* Use at your own risk.
*
* @internal
*
*/
function getConstraintInfo(checker, type) {
if (tsutils.isTypeParameter(type)) {
const constraintType = checker.getBaseConstraintOfType(type);
return {
constraintType,
isTypeParameter: true,
};
}
return {
constraintType: type,
isTypeParameter: false,
};
}