a6c5d50749
* Allow type predicates 1. Parse type predicates. Note that they are parsed everywhere, and get the appropriate error when used places besides a return type. 2. When creating a type predicate, correctly find the function's parameters starting from the jsdoc return type. * Fix type of TypePredicateNode.parent: add JSDocTypeExpression * Update API baselines * Handle JSDoc signature inside @type annotations * Fix circularity when getting type predicates Also move createTypePredicateFromTypePredicateNode closer to its use * More cleanup based on review comments
66 lines
1 KiB
TypeScript
66 lines
1 KiB
TypeScript
// @noEmit: true
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// @allowJs: true
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// @checkJs: true
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// @lib: esnext
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// @Filename: bug25127.js
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class Entry {
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constructor() {
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this.c = 1
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}
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/**
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* @param {any} x
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* @return {this is Entry}
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*/
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isInit(x) {
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return true
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}
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}
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class Group {
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constructor() {
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this.d = 'no'
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}
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/**
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* @param {any} x
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* @return {false}
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*/
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isInit(x) {
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return false
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}
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}
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/** @param {Entry | Group} chunk */
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function f(chunk) {
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let x = chunk.isInit(chunk) ? chunk.c : chunk.d
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return x
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}
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/**
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* @param {any} value
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* @return {value is boolean}
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*/
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function isBoolean(value) {
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return typeof value === "boolean";
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}
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/** @param {boolean | number} val */
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function foo(val) {
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if (isBoolean(val)) {
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val;
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}
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}
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/**
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* @callback Cb
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* @param {unknown} x
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* @return {x is number}
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*/
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/** @type {Cb} */
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function isNumber(x) { return typeof x === "number" }
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/** @param {unknown} x */
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function g(x) {
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if (isNumber(x)) {
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x * 2;
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}
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}
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