decorator-cache-getter
Version:
Simple decorator for caching getters on first access
72 lines • 2.71 kB
JavaScript
;
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
Object.defineProperty(exports, "__esModule", { value: true });
var index_1 = require("./index");
describe("decorator cache getter", function () {
it("should cache result of getter", function () {
var Test = /** @class */ (function () {
function Test() {
this.i = 0;
}
Object.defineProperty(Test.prototype, "incr", {
get: function () {
return ++this.i;
},
enumerable: true,
configurable: true
});
__decorate([
index_1.cache
], Test.prototype, "incr", null);
return Test;
}());
var test = new Test();
expect(test.incr).toEqual(1);
expect(test.incr).toEqual(1);
expect(test.incr).toEqual(1);
expect(test.i).toEqual(1);
});
it("should cache result of static getter", function () {
var Test = /** @class */ (function () {
function Test() {
}
Object.defineProperty(Test, "incr", {
get: function () {
return ++this.i;
},
enumerable: true,
configurable: true
});
Test.i = 0;
__decorate([
index_1.cache
], Test, "incr", null);
return Test;
}());
expect(Test.incr).toEqual(1);
expect(Test.incr).toEqual(1);
expect(Test.incr).toEqual(1);
expect(Test.i).toEqual(1);
});
it("should raise when decorating a non-getter", function () {
expect(function () {
var Test = /** @class */ (function () {
function Test() {
}
Test.prototype.method = function () {
/* Empty */
};
__decorate([
index_1.cache
], Test.prototype, "method", null);
return Test;
}());
}).toThrowError(TypeError);
});
});
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