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| import * as fs from "fs"; | |
| let exports; | |
| // reflective API takes environment descriptors and uses revealing constructor pattern | |
| // to expose mutators to the creator of the module instance object | |
| var mod = new Reflect.Module({ | |
| // initialized mutable (includes "uninitialized" var) | |
| x: { value: undefined }, | |
| y: { value: 42 }, | |
| // uninitialized mutable (let, class) | |
| z: { }, | |
| // initialized immutable (const) | |
| PI: { value: Math.PI, const: true }, | |
| // uninitialized immutable (const) | |
| TAU: { const: true }, | |
| // re-export | |
| readFile: { module: fs, import: "readFile" } | |
| }, function(mutator) { exports = mutator; }); | |
| // mutator object uses setters to write through to the module's encapsulated environment | |
| console.log(mod.y); // 42 | |
| exports.y = 43; | |
| console.log(mod.y); // 43 |
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